CN108667330B - Power supply system and power supply control method - Google Patents
Power supply system and power supply control method Download PDFInfo
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- CN108667330B CN108667330B CN201710198263.1A CN201710198263A CN108667330B CN 108667330 B CN108667330 B CN 108667330B CN 201710198263 A CN201710198263 A CN 201710198263A CN 108667330 B CN108667330 B CN 108667330B
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- 238000010521 absorption reaction Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 2
- 230000011664 signaling Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 12
- 230000001276 controlling effect Effects 0.000 description 11
- 230000009466 transformation Effects 0.000 description 9
- 230000001105 regulatory effect Effects 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 4
- 238000004378 air conditioning Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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Abstract
The invention provides a power supply system and a power supply control method, wherein the power supply system comprises: a plurality of inverters, a plurality of controllers, a plurality of current sensors, and a voltage sensor; the input ends of the inverters are connected to the same power supply input end; the output end of each inverter is connected with a current sensor, and the current sensor is connected with a controller; the output ends of the inverters are connected with the same voltage sensor, and the voltage sensor is also connected with the controllers; the controller is also connected with the control end of an inverter; the one controller is also connected with other controllers in the plurality of controllers to receive the current detected by the current sensor connected with the other controllers and sent by the other controllers. The invention realizes the current sharing among different inverters by controlling and adjusting the connected inverters through the controller, avoids the occurrence of circulation, effectively avoids the interruption of power supply and ensures the normal operation of the vehicle.
Description
Technical Field
The invention relates to the technical field of power supply, in particular to a power supply system and a power supply control method.
Background
The inverter is the most critical device in the auxiliary power supply of subways and light rails, and is used for converting direct-current electric energy into alternating current and supplying power to auxiliary equipment such as an air conditioning unit, a ventilation device, a lighting device and the like on a vehicle.
At present, power can be supplied to a whole vehicle auxiliary system in a concentrated mode through one inverter, if the inverter is damaged, normal operation of auxiliary equipment on a vehicle is directly affected, and therefore stable operation and comfortableness of the vehicle are affected. In order to solve the problem, a plurality of inverters can be used for parallel operation power supply, when one auxiliary inverter fails, other inverters can still operate normally, power supply for auxiliary equipment on a vehicle is continued, and the reliability of the system is improved.
However, in the parallel operation process of multiple inverters, current sharing is generally difficult to achieve among different inverters, circulation is easy to occur, so that extremely large power supply system loss is caused, and even the power supply system is broken down, so that power supply is interrupted, and normal operation of a vehicle is affected.
Disclosure of Invention
The invention provides a power supply system and a power supply control method, which can control and regulate the connected inverters through a controller to realize current sharing among different inverters, avoid circulation, effectively avoid power interruption and ensure normal operation of a vehicle.
The power supply system provided by the invention comprises: a plurality of inverters, a plurality of controllers, a plurality of current sensors, and a voltage sensor;
the input ends of the inverters are connected to the same power supply input end; the output end of each inverter is connected with a current sensor, and the current sensor is connected with a controller;
The output ends of the inverters are connected with the same voltage sensor, and the voltage sensor is also connected with the controllers;
the controller is also connected with the control end of an inverter;
The controller is also connected with other controllers in the plurality of controllers to receive the current detected by the current sensor connected with the other controllers and sent by the other controllers;
The controller is used for controlling the inverters connected with the controller according to the current detected by the current sensor, the currents detected by the other current sensors and the voltage detected by the voltage sensor, so that the current difference of the currents output by different inverters is within a preset range.
Further, the power supply system further includes: a transformer; the output ends of the inverters are connected with the same transformer, and the transformer is connected with the voltage sensor;
the transformer is also connected with load equipment on the train to supply power to the load equipment.
Further, the control end of each inverter comprises a plurality of switching tubes, and the controller is connected with the plurality of switching tubes;
and the controller controls the output voltage of the inverter connected with the controller by controlling the on-off of the switching tubes.
Further, the current detected by the current sensor and the current detected by the other current sensors are both alternating current signals; the voltage detected by the voltage sensor is an alternating current voltage signal;
The controller is used for comparing the current detected by the current sensor with the currents detected by the other current sensors to obtain an alternating current difference signal, converting the alternating current difference signal into a direct current difference signal, and comparing the direct current difference signal with a preset current value to obtain a current regulation signal;
The controller is used for converting the voltage acquired by the voltage sensor into a direct-current voltage signal, comparing the direct-current voltage signal with a preset voltage value to obtain a voltage regulating signal, obtaining a control signal according to the current regulating signal and the voltage regulating signal, and controlling the output voltage of the inverter connected with the controller according to the control signal.
Further, the one controller includes: a DSP chip and an FPGA chip;
The FPGA chip is used for receiving the current detected by the current sensor, the voltage acquired by the voltage sensor and the current detected by the current sensor connected with the other controllers and sent by the other controllers, and sending the acquired voltage and current signals to the DSP chip;
the DSP chip is used for controlling the inverter connected with the controller according to the current detected by the current sensor, the currents detected by the other current sensors and the voltage detected by the voltage sensor.
The invention provides a power supply control method, which is suitable for a power supply system, and comprises the following steps: a plurality of inverters, a plurality of controllers, a plurality of current sensors, and a voltage sensor; wherein the input ends of the inverters are connected to the same power input end; the output end of each inverter is connected with a current sensor, and the current sensor is connected with a controller; the output ends of the inverters are connected with the same voltage sensor, and the voltage sensor is also connected with the controllers; the output ends of the inverters are connected with the same voltage sensor; the controller is also connected with the control end of an inverter; the one controller is also connected with other controllers in the plurality of controllers; the method comprises the following steps:
The controller receives the current detected by the current sensor, the current detected by the other current sensors and the voltage detected by the voltage sensor;
The controller obtains a control signal according to the current detected by the current sensor, the current detected by the other current sensors and the voltage detected by the voltage sensor;
And the controller controls the inverters connected with the controller according to the control signal so that the current difference of the currents output by different inverters is within a preset range.
Further, the current detected by the current sensor and the current detected by the other current sensors are both alternating current signals; the voltage detected by the voltage sensor is an alternating current voltage signal;
The one controller obtains a control signal according to the current detected by the one current sensor, the current detected by the other sensors and the voltage detected by the voltage sensor, and the control signal comprises:
The controller compares the current detected by the current sensor with the currents detected by the other current sensors to obtain an alternating current difference signal;
the one controller converts the alternating current difference signal into a direct current difference signal;
the controller compares the direct current difference signal with a preset current value to obtain a current regulation signal;
the controller converts the voltage acquired by the voltage sensor into a direct-current voltage signal;
The controller compares the direct-current voltage signal with a preset voltage value to obtain a voltage regulation signal;
And the controller obtains the control signal according to the current adjusting signal and the voltage adjusting signal.
Further, the control end of each inverter comprises a plurality of switching tubes, and the controller is connected with the plurality of switching tubes;
the one controller controls the one inverter according to the control signal, and the one controller comprises:
And the controller controls the on-off of the switching tubes according to the control signals so as to control the output voltage of the inverter connected with the controller.
The invention provides a power supply system and a power supply control method, wherein the power supply system comprises: a plurality of inverters, a plurality of controllers, a plurality of current sensors, and a voltage sensor; the input ends of the inverters are connected to the same power supply input end; the output end of each inverter is connected with a current sensor, and the current sensor is connected with a controller; the output ends of the inverters are connected with the same voltage sensor, and the voltage sensor is also connected with the controllers; the controller is also connected with the control end of an inverter; the controller is also connected with other controllers in the plurality of controllers to receive the current detected by the current sensor connected with the other controllers and sent by the other controllers; the controller is used for controlling the inverters connected with the controller according to the current detected by the current sensor and the current detected by the other current sensors and the voltage signal detected by the voltage sensor so that the current difference of the currents output by different inverters is within a preset range. According to the power supply system provided by the invention, the controller can adjust the control ends of the parallel inverters according to the detected voltage and current signals, so that the current difference of the output currents of the parallel inverters is within the preset range, and the current sharing among different inverters is realized, thereby avoiding the occurrence of circulation, effectively avoiding the interruption of power supply and ensuring the normal operation of a vehicle.
Drawings
Fig. 1 is a schematic structural diagram of a power supply system according to the present invention;
Fig. 2 is a schematic circuit diagram of an inverter according to the present invention;
FIG. 3 is a schematic diagram of another power supply system according to the present invention;
FIG. 4 is a schematic diagram of a controller according to the present invention;
FIG. 5 is a schematic diagram of a power control method according to the present invention;
FIG. 6 is a flowchart of another power supply control method according to the present invention;
Fig. 7 is a schematic block diagram of parallel loop control of an inverter according to the present invention.
Reference numerals illustrate:
U-input voltage;
Sa1, sa2, sa3, sa4, sb1, sb2, sb3, sb4, sc1, sc2, sc3, sc 4-switching tube;
R-load;
c1, C2-capacitance;
L-inductance;
Ia. Ib, ic-three-phase output current;
Va, vb, vc-three-phase output voltage;
1-an inverter;
2-a current sensor;
3-a voltage sensor;
4-a controller;
5-input terminal;
6-an output;
7-transformers.
Detailed Description
The power supply system provided by the embodiments of the invention can be applied to a train power supply system for supplying power to load equipment on a train. The load devices on the train may include: air conditioning, lighting, ventilation, etc.
The following is described in connection with a number of examples. Fig. 1 is a schematic structural diagram of a power supply system according to the present invention. As shown in fig. 1, the power supply system includes: a plurality of inverters 1, a plurality of controllers 4, a plurality of current sensors 2, and a voltage sensor 3.
The input terminals 5 of the plurality of inverters 1 are connected to the same power supply input terminal; the output 6 of each inverter 1 is connected to a current sensor 2, and a current sensor 2 is connected to a controller 4;
specifically, the power supply input terminal 5 is connected to a direct current power supply. The inverter 1 may convert the input direct current into alternating current.
The output ends 6 of the inverters 1 are connected with the same voltage sensor 3, and the voltage sensor 3 is also connected with the controllers 4;
specifically, the output terminals of the plurality of inverters 1 correspond to power output terminals of a power supply system, and the power output terminals may be connected to load devices, which may be load devices on a train. The load device may be, for example: air conditioning, lighting, ventilation, etc.
A controller 4 is also connected to the control terminal of an inverter 1;
One controller 4 is also connected to other controllers 4 among the plurality of controllers 4 to receive the current detected by the current sensor 2 connected to the other controllers 4 transmitted by the other controllers 4;
specifically, one controller 4 may be connected to other controllers 4 among the plurality of controllers 4 through a controller area network (Controller Area Network, abbreviated as CAN) bus.
One controller 4 is used for controlling the inverters 1 connected with the one controller 4 according to the current detected by the one current sensor 2, the current detected by the other current sensors 2 and the voltage detected by the voltage sensor 3 so that the current difference of the currents output by the different inverters 1 is within a preset range.
Specifically, the current difference preset range may be 0. By performing difference operation on the currents of the two inverters, the current difference between the two inverters can be obtained, and the current difference represents the circulation information between different inverters. If the different inverters are in the current sharing state, no circulation current is generated, and at this time, the current difference between the different inverters can be within a preset range, for example, the current difference is 0. At this time, the voltage detected by the voltage sensor is combined to control different inverters, so that current difference signals of the different inverters are controlled, and current difference is within the preset range, so that current sharing control of the different inverters connected in parallel can be realized.
Each of the inverters 1 may be, for example, a topology of a T-type three-level inverter. For example, fig. 2 is a schematic circuit diagram of an inverter according to the present invention. As shown in fig. 2, the power supply comprises an input voltage U, switching transistors Sa1, sa2, sa3, sa4, sb1, sb2, sb3, sb4, sc1, sc2, sc3, sc4 and an output load R, an absorption circuit is connected in parallel to the power supply input end, the absorption circuit comprises a capacitor C1 and a capacitor C2 connected in series, and the capacitor C1 and the capacitor C2 are respectively connected with the output load R through a switching transistor, an ac filter inductance L and the like in sequence. Ia. Ib, ic are three-phase currents output by the inverter, va, vb, vc are three-phase voltages output by the inverter.
Compared with the traditional two-level inverter, the T-shaped three-level inverter is adopted, so that the voltage withstand problem of the device and the contradiction between the voltage withstand of the device and the frequency of a switching tube are fundamentally solved. Meanwhile, compared with a diode clamp compared topology, the T-shaped topology has fewer used devices, smaller corresponding conduction loss and higher efficiency.
The power supply system provided by the invention comprises: a plurality of inverters, a plurality of controllers, a plurality of current sensors, and a voltage sensor; the input ends of the inverters are connected to the same power supply input end; the output end of each inverter is connected with a current sensor, and the current sensor is connected with a controller; the output ends of the inverters are connected with the same voltage sensor, and the voltage sensor is also connected with the controllers; the controller is also connected with the control end of an inverter; the controller is also connected with other controllers in the plurality of controllers to receive the current detected by the current sensor connected with the other controllers and sent by the other controllers; the controller is used for controlling the inverters connected with the controller according to the current detected by the current sensor and the current detected by the other current sensors and the voltage signal detected by the voltage sensor so that the current difference of the currents output by different inverters is within a preset range. According to the power supply system provided by the invention, the controller can adjust the control ends of the parallel inverters according to the detected voltage and current signals, so that the current difference of the output currents of the parallel inverters is within the preset range, and the current sharing among different inverters is realized, thereby avoiding the occurrence of circulation, effectively avoiding the interruption of power supply and ensuring the normal operation of a vehicle.
Optionally, fig. 3 is a schematic structural diagram of another power supply system provided by the present invention. As shown in fig. 3, the power supply system may further include: a transformer 7; the output ends of the inverters 1 are connected with the same transformer 7, and the transformer 7 is connected with the voltage sensor 3;
the transformer 7 is also connected to load devices on the train to power the load devices.
Specifically, by arranging the transformer 7 at the power output end, alternating voltage can be changed, alternating current can be exchanged, and the alternating current can be adjusted to be used by loads on a train.
According to the power supply system provided by the invention, the voltage and the current output by each parallel inverter can be adjusted to be used by loads on a train through the arrangement of the transformer 7.
Further, the control end of each inverter 1 comprises a plurality of switching tubes, and one controller 1 is connected with the plurality of switching tubes;
One controller 4 controls the output voltage of the inverter 1 to which one controller 4 is connected by controlling the on-off of a plurality of switching transistors.
Specifically, taking the inverter shown in fig. 2 as an example, the control terminal of each inverter 1 may include switching tubes Sa1, sa2, sa3, sa4, sb1, sb2, sb3, sb4, sc1, sc2, sc3, sc4, which may be used as the control terminal of each inverter 1, and each switching tube is connected to a controller connected to each inverter 1.
The controller 4 obtains a control signal according to the current detected by one current sensor 2, the current detected by other current sensors 2 and the voltage detected by the voltage sensor 3, and controls the on-off of each switching tube according to the control signal, thereby controlling the frequency and the amplitude of the output voltage of each inverter 1. Wherein the control signal is a pulse control signal.
The invention sets a plurality of switching tubes as the control ends of the inverters 1, and controls the control ends of the inverters 1 through the controller 4, thereby avoiding the generation of circulation current among the inverters 1.
Further, the current detected by one current sensor 2 and the current detected by other current sensors 2 are both alternating current signals; the voltage detected by the voltage sensor 3 is an ac voltage signal.
And a controller 4 is used for comparing the current detected by one current sensor 2 with the currents detected by other current sensors 2 to obtain an alternating current difference signal, converting the alternating current difference signal into a direct current difference signal, and comparing the direct current difference signal with a preset current value to obtain a current regulation signal.
The controller 4 is configured to convert the voltage collected by the voltage sensor 3 into a dc voltage signal, compare the dc voltage signal with a preset voltage value, obtain a voltage adjustment signal, obtain a control signal according to the current adjustment signal and the voltage adjustment signal, and control an output voltage of the inverter 1 connected to the controller 4 according to the control signal.
Fig. 4 is a schematic diagram of a controller according to the present invention. The controller 4 as shown in fig. 4 includes: a Digital Signal Processing (DSP) chip 8 and a Field-Programmable gate array (FPGA) chip 9.
The FPGA chip 9 is configured to receive the current detected by one current sensor 2 and the voltage acquired by the voltage sensor 3, and send the current detected by the current sensor 2 connected to the other controller 4 and sent by the other controller 4, and send the acquired voltage and current signals to the DSP chip 8.
The DSP chip 8 is used for controlling the inverter 1 connected to one controller 4 according to the current detected by one current sensor 2, the current detected by the other current sensors 2, and the voltage detected by the voltage sensor 3.
Specifically, the current collected by the current sensor 2 and the voltage collected by the voltage sensor 3 may be sent to the FPGA chip 9 in the controller 4, so as to implement data sampling.
The FPGA chip 9 in one controller 4 shown in fig. 4 may also receive the current detected by the current sensor 2 connected to the other controller 4 and sent by the other controller 4, so as to implement inter-board communication. The other controllers 4 may send the current detected by the current sensor connected to the other controllers to the FPGA chip 9 in one controller 4 through the CAN bus.
The FPGA chip may send the received current detected by one current sensor 2, the current detected by the other current sensors 2, the voltage detected by the voltage sensor 3, etc. to the DSP chip 8.
The DSP chip 8 can control the inverter 1 connected to one controller 4 based on the current detected by one current sensor 2, the current detected by the other current sensors 2, and the voltage detected by the voltage sensor 3.
The controller provided by the invention realizes data sampling and plate communication through the FPGA chip, and realizes the control algorithm of the parallel inverter through the DSP chip.
Further, one controller 4 is connected to other controllers 4 among the plurality of controllers 4 through a CAN bus.
The invention provides a power supply control method, which is suitable for a power supply system, and comprises the following steps: a plurality of inverters 1, a plurality of controllers 4, a plurality of current sensors 2, and a voltage sensor 3; wherein the input terminals 5 of the plurality of inverters 1 are connected to the same power supply input terminal; the output 6 of each inverter 1 is connected to a current sensor 2, and a current sensor 2 is connected to a controller 4; the output ends 6 of the inverters 1 are connected with the same voltage sensor 3, and the voltage sensor 3 is also connected with the controllers 4; the output ends 6 of the inverters 1 are connected with the same voltage sensor 3; a controller 4 is also connected to the control terminal of an inverter 1; one controller 4 is also connected to other controllers 4 among the plurality of controllers 4.
Fig. 5 is a schematic diagram of a power supply control method according to the present invention. As shown in fig. 5, the method may include the steps of:
S501, the one controller receives the current detected by the one current sensor, the current detected by the other current sensors, and the voltage detected by the voltage sensor.
Specifically, the current detected by one current sensor and the current detected by other current sensors are both alternating current signals; the voltage detected by the voltage sensor is an alternating voltage signal.
S502, the controller obtains a control signal according to the current detected by the current sensor, the current detected by the other current sensors and the voltage detected by the voltage sensor.
S503, the controller controls the inverter connected with the controller according to the control signal so that the current difference of the currents output by different inverters is within a preset range.
Specifically, the control end of each inverter comprises a plurality of switching tubes, and the controller is connected with the plurality of switching tubes;
The controller controls the on-off of the switch tubes according to the control signal so as to control the output voltage of the inverter connected with the controller.
When the power supply system generates circulation, the controller can send a pulse width modulation (Pulse Width Modulation, PWM for short) control signal to the control end of the inverter, so that the frequency and amplitude of the voltage of the output end of each inverter are controlled, and the current difference output by each parallel inverter is within a preset range. Meanwhile, each inverter is controlled by one controller, so that a plurality of inverters can be controlled independently and are not interfered with each other, redundancy of a parallel system is improved, reliability of a circuit is improved, and overhaul and maintenance are facilitated.
Optionally, the invention further provides a power supply control method. Fig. 6 is a flowchart of another power supply control method provided by the present invention. As shown in fig. 6, the method, in S502 shown above, the one controller obtaining a control signal according to the current detected by the one current sensor, the current detected by the other current sensor, and the voltage detected by the voltage sensor may include:
s601, the controller compares the current detected by the current sensor with the currents detected by the other current sensors to obtain an alternating current difference signal.
For example, fig. 7 is a schematic block diagram of parallel loop control of an inverter according to the present invention. As shown in fig. 7, taking a controller as an example, the controller obtains a current detected by a current sensor, for example, the current may be a three-phase ac current I abc-master (self-inverter current), and the current detected by another current sensor may be a three-phase current I abc-slave (other inverter current); and the voltage detected by the voltage sensor may be, for example, a three-phase voltage V abc.
The controller calculates the difference value between the self-inverter current I abc-master and the other inverter current I abc-slave to obtain an alternating current difference I eabc.
S602, the controller converts the alternating current difference signal into a direct current difference signal.
Specifically, the current difference I eabc is subjected to coordinate transformation, so that a d-axis component I ed and a q-axis component I eq of the three-phase circulation current I eabc in a rotating coordinate system can be obtained. The d-axis component I ed and the q-axis component I ed in the rotating coordinate system are the dc current difference signals.
S603, the controller compares the direct current difference signal with a preset current value to obtain a current regulating signal.
S604, the controller converts the voltage acquired by the voltage sensor into a direct-current voltage signal.
Specifically, the voltage V abc collected by the voltage sensor is subjected to coordinate transformation to obtain a d-axis component V d and a q-axis component V q of the voltage V abc in a rotating coordinate system. The d-axis component V d and the q-axis component V q in the rotating coordinate system are the dc voltage signals.
S605, the controller compares the direct-current voltage signal with a preset voltage value to obtain a voltage regulation signal.
Taking coordinate transformation of three-phase voltage V abc as an example, the coordinate transformation formulas are shown as formula (1) and formula (2)
Firstly, the conversion is performed as shown in the formula (1), the formula (1) is a mathematical conversion from a three-phase coordinate system to a two-phase coordinate system, the input three-phase voltage signal V abc is converted by the formula (1) to obtain two-phase voltage signals, which are a first voltage signal V α and a second voltage signal V β respectively, the second voltage signal V β is delayed by 90 ° in phase relative to the first voltage signal V α, and V α in the first voltage signal V α and the three-phase voltage V abc are in phase.
Then, the transformation is carried out as shown in a formula (2), wherein the formula (2) is the mathematical transformation from a two-phase static coordinate system to a two-phase rotating coordinate system, and V α and V β are components of three-phase voltage V abc on alpha and beta axes of the static alpha beta coordinate system respectively; v d and V q are components of the three-phase voltage V abc on the d, q axes, respectively; θ is the phase rotation angle, i.e., the angle between the d-axis and the q-axis.
The d-axis component U d and the q-axis component U q under a rotating coordinate system can be obtained after the output voltage V abc is subjected to coordinate transformation, and after the d-axis component U d and the q-axis component U q are compared with a preset voltage value, d-axis control component M d1 and q-axis control component M q1 are obtained through adjustment of a proportional integral controller (Proportional Integral controller, abbreviated as PI controller), and the output voltage control of the inverter is realized through adjustment of M d1、Mq1.
The coordinate transformation mode of the three-phase circulation current I eabc and the output voltage V abc of the inverter is the same, the d-axis circulation current I ed and the q-axis circulation current I eq under a rotating coordinate system can be obtained after the three-phase circulation current I eabc is subjected to coordinate transformation, the d-axis circulation current I ed and the q-axis circulation current I eq are respectively compared with a preset current value, and then the d-axis regulation component M d2 and the q-axis regulation component M q2 are obtained after the d-axis circulation current I eabc and the q-axis circulation current I eq are regulated through a PI controller.
The PI controller is a linear controller, which can form control deviation according to a given value and an actual output value, and form a control quantity by linear combination of a proportion (P) and an integral (I) of the deviation, so as to control the controlled quantity.
S606, the controller obtains the control signal according to the current adjusting signal and the voltage adjusting signal.
Specifically, the adjustment component M d1、Mq1 and the control component M d2、Mq2 are respectively superimposed to obtain M d and M q.
Meanwhile, the phase-locked loop can calculate and obtain a phase angle theta according to the output end voltage detected by the voltage sensor 5; the regulating coefficient k can be obtained by adopting a midpoint potential control algorithm for the inverter; the PWM control signals for controlling the inverter 1 and the inverter 2 can be obtained by calculating the adjustment quantity M d、Mq, the phase angle theta and the adjustment coefficient k through a PWM algorithm, and finally, parallel current sharing of the inverters is realized.
The controller can output the obtained PWM control signal to a switching tube corresponding to the controller, and modulates each pulse width of the PWM control signal according to a preset rule, so that the output voltage of the inverter can be changed, and the output frequency of the inverter can be changed.
According to the power supply control method provided by the invention, the current and the voltage of each parallel inverter are controlled by the controller, so that the output currents of each parallel inverter are equal, and the generation of circulation in a power supply system is avoided. Meanwhile, each inverter is independently controlled by a controller and is not interfered with each other, so that the stability of the parallel system is improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (6)
1. A power supply system, comprising: a plurality of inverters, a plurality of controllers, a plurality of current sensors, and a voltage sensor;
the input ends of the inverters are connected to the same power supply input end; the output end of each inverter is connected with a current sensor, and the current sensor is connected with a controller;
The output ends of the inverters are connected with the same voltage sensor, and the voltage sensor is also connected with the controllers;
the controller is also connected with the control end of an inverter;
The controller is also connected with other controllers in the plurality of controllers to receive the current detected by the current sensor connected with the other controllers and sent by the other controllers;
the controller is used for controlling the inverters connected with the controller according to the current detected by the current sensor, the current detected by other current sensors and the voltage detected by the voltage sensor so that the current difference of the currents output by different inverters is within a preset range;
The current detected by the current sensor and the current detected by the other current sensors are both alternating current signals; the voltage detected by the voltage sensor is an alternating current voltage signal;
The controller is used for comparing the current detected by the current sensor with the currents detected by the other current sensors to obtain an alternating current difference signal, converting the alternating current difference signal into a direct current difference signal, and comparing the direct current difference signal with a preset current value to obtain a current regulation signal;
The controller is used for converting the voltage acquired by the voltage sensor into a direct-current voltage signal, comparing the direct-current voltage signal with a preset voltage value to obtain a voltage regulation signal, obtaining a control signal according to the current regulation signal and the voltage regulation signal, and controlling the output voltage of the inverter connected with the controller according to the control signal;
the inverter is a T-shaped three-level inverter, the T-shaped three-level inverter comprises an absorption circuit, a switching tube and an alternating current filter inductor, the absorption circuit is connected in parallel with the input end of a power supply, and the absorption circuit is connected with an output load through the switching tube and the alternating current filter inductor.
2. The power supply system of claim 1, further comprising: a transformer; the output ends of the inverters are connected with the same transformer, and the transformer is connected with the voltage sensor;
the transformer is also connected with load equipment on the train to supply power to the load equipment.
3. The power supply system according to claim 1, wherein the control terminal of each inverter includes a plurality of switching tubes, and the one controller is connected to the plurality of switching tubes;
and the controller controls the output voltage of the inverter connected with the controller by controlling the on-off of the switching tubes.
4. A power supply system according to any one of claims 1-3, characterized in that said one controller comprises: a digital signal processing DSP chip and a field programmable gate array FPGA chip;
The FPGA chip is used for collecting the current detected by the current sensor and the voltage detected by the voltage sensor, collecting the current detected by the current sensor connected with the other controllers and sent by the other controllers, and sending the collected voltage and current signals to the DSP chip;
the DSP chip is used for controlling the inverter connected with the controller according to the current detected by the current sensor, the currents detected by the other current sensors and the voltage detected by the voltage sensor.
5. A power supply control method, characterized in that the method is applied to the power supply system according to any one of claims 1 to 4, the power supply system comprising: a plurality of inverters, a plurality of controllers, a plurality of current sensors, and a voltage sensor; wherein the input ends of the inverters are connected to the same power input end; the output end of each inverter is connected with a current sensor, and the current sensor is connected with a controller; the output ends of the inverters are connected with the same voltage sensor, and the voltage sensor is also connected with the controllers; the output ends of the inverters are connected with the same voltage sensor; the controller is also connected with the control end of an inverter; the one controller is also connected with other controllers in the plurality of controllers; the inverter is a T-shaped three-level inverter, the T-shaped three-level inverter comprises an absorption circuit, a switching tube and an alternating current filter inductor, the absorption circuit is connected in parallel with the input end of a power supply, and the absorption circuit is connected with an output load through the switching tube and the alternating current filter inductor; the method comprises the following steps:
The controller receives the current detected by the current sensor, the current detected by the other current sensors and the voltage detected by the voltage sensor;
The controller obtains a control signal according to the current detected by the current sensor, the current detected by the other current sensors and the voltage detected by the voltage sensor;
the controller controls the inverters connected with the controller according to the control signal so that the current difference of the currents output by different inverters is within a preset range;
The current detected by the current sensor and the current detected by the other current sensors are both alternating current signals; the voltage detected by the voltage sensor is an alternating current voltage signal;
The one controller obtains a control signal according to the current detected by the one current sensor, the current detected by the other current sensors, and the voltage detected by the voltage sensor, and the control signal comprises:
The controller compares the current detected by the current sensor with the currents detected by the other current sensors to obtain an alternating current difference signal;
the one controller converts the alternating current difference signal into a direct current difference signal;
the controller compares the direct current difference signal with a preset current value to obtain a current regulation signal;
the controller converts the voltage acquired by the voltage sensor into a direct-current voltage signal;
The controller compares the direct-current voltage signal with a preset voltage value to obtain a voltage regulation signal;
And the controller obtains the control signal according to the current adjusting signal and the voltage adjusting signal.
6. The method of claim 5, wherein the control side of each inverter comprises a plurality of switching tubes, and wherein the one controller is connected to the plurality of switching tubes;
the one controller controls the one inverter according to the control signal, and the one controller comprises:
And the controller controls the on-off of the switching tubes according to the control signals so as to control the output voltage of the inverter connected with the controller.
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| CN112350601A (en) * | 2020-10-30 | 2021-02-09 | 株洲中车时代电气股份有限公司 | Medium-voltage and medium-frequency inverter power supply for ROV |
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| CN206575342U (en) * | 2017-03-29 | 2017-10-20 | 西安中车永电捷通电气有限公司 | Electric power system |
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| CN102255538B (en) * | 2010-05-19 | 2014-03-12 | 力博特公司 | T-shaped three-level inverter circuit |
| CN102723889B (en) * | 2012-07-03 | 2014-11-05 | 华为技术有限公司 | Inverter and pulse width modulation (PWM) method thereof |
| CN104716857A (en) * | 2013-12-17 | 2015-06-17 | 北车大连电力牵引研发中心有限公司 | Urban rail vehicle auxiliary system, current-sharing control method and urban rail vehicle |
| CN103731057A (en) * | 2013-12-26 | 2014-04-16 | 安徽巨日华电新能源有限公司 | T-shaped three-level inverter |
| CN104038090B (en) * | 2014-06-23 | 2017-01-04 | 威凡智能电气高科技有限公司 | A kind of based on the antiparallel T-shaped multi-level inverter circuit of reverse blocking IGBT |
| CN104270027B (en) * | 2014-10-23 | 2017-06-13 | 阳光电源股份有限公司 | A kind of multi-electrical level inverter pwm pulse generation method and device |
| CN104578871B (en) * | 2015-01-15 | 2015-11-04 | 国家电网公司 | A Method for Suppressing Output Power Unbalance of Inverter Parallel System |
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| CN102480244A (en) * | 2010-11-24 | 2012-05-30 | 中兴通讯股份有限公司 | High-power inverter system |
| CN206575342U (en) * | 2017-03-29 | 2017-10-20 | 西安中车永电捷通电气有限公司 | Electric power system |
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