CN115955131A - A generator voltage regulation and rectification method - Google Patents

Abstract

The invention discloses a generator voltage regulation and rectification method. The method comprises a generator and a three-phase bridge full-control rectification circuit. By collecting the output DC voltage U _F of the three-phase bridge full-control rectification circuit, according to the output DC The control angle α is obtained by calculating the voltage U _F and the output voltage reference value U _ref , and the control angle α is adjusted in real time to control the output DC voltage U _F of the three-phase bridge fully-controlled rectifier circuit. The invention takes the generator output current as the observation object, does not need many external signals, and provides a new voltage control mode for the locomotive power generation rectification control system.

Description

A generator voltage regulation and rectification method

technical field

The invention relates to the technical field of generator voltage regulation, in particular to a generator voltage regulation and rectification method.

Background technique

The existing locomotive generator voltage regulation technology usually uses the AC phase voltage signal as the reference physical quantity to implement control actions, and short-circuit rectifier voltage regulators and switch-type rectifier voltage regulators have evolved.

For conventional short-circuit rectifier voltage regulators, when the output voltage needs to bypass the generator energy due to high output voltage, the short-circuit action is implemented when the phase voltage crosses zero, the switching element of the lower arm of the rectifier arm is turned on, and the switch of the upper arm of the rectifier arm is turned off. Components; when the output voltage needs to be rectified to output generator energy, the rectification action is implemented when the phase voltage crosses zero, the switching element of the upper arm of the rectifier bridge is turned on, and the switching element of the lower arm of the rectifier bridge is turned off, thus realizing energy output control and voltage regulation.

For the short-circuit rectified voltage adjustment method, the generator is in a full-load state for a long time, which makes the generator coil temperature high, the heat dissipation system of the fuel vehicle has high requirements, the circulating oil temperature of the fuel vehicle is high, and the high oil temperature reduces the reliability of the magneto. At the same time, the fuel economy of fuel vehicles is reduced. Since the main circuit of most short-circuit rectified voltage regulators is composed of MOSFETs, the heat generation is small and the output current is large, making the voltage regulator suitable for medium and large displacements.

For conventional switching rectifier voltage regulators, when there is no need to output generator energy because the output voltage is high, the cut-off action is implemented when the phase voltage crosses zero, and the upper and lower bridge arms of the rectifier arm are cut off; when the rectifier arm is required due to low output voltage When outputting generator energy, when the phase voltage is positively crossing zero, open the channel of the upper arm of the rectifier bridge arm and close the channel of the lower arm of the rectifier bridge arm; when the phase voltage is negatively crossing zero, turn off the channel of the upper arm arm of the rectifier arm The lower bridge arm path of the rectifier bridge realizes energy output control and voltage regulation in this way.

For conventional switching rectifier voltage regulators, the main components of the rectifier are generally composed of silicon controlled rectifiers and rectifier diodes. The heating of the main circuit determines that the power density of the rectifier is low, and it is difficult to output large currents. It is only suitable for small and medium displacements.

The existing integrated voltage regulator adopts the angle phase-shift control mode, which requires external generator magnet detection components, such as Hall elements integrated in the generator, auxiliary coils, boss point detection components, etc. The sensor detects the generator magnet The steel position and the relationship between the output voltage and the output voltage reference value are used to control the movement of the upper and lower bridge arms of the rectifier bridge, and then control the output voltage. The introduction of sensor signals requires an external wiring system, which increases system complexity and reduces system reliability.

Contents of the invention

Aiming at the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: to provide a method to adjust the specific turn-on and turn-off action points of the switching devices of each bridge arm according to the difference between the output DC voltage and the output voltage reference value to realize A generator voltage regulation and rectification method for controlling output voltage control.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

A generator voltage regulation and rectification method, the generator voltage regulation and rectification method comprising a generator and a three-phase bridge full-control rectification circuit,

Collect the output DC voltage U _F of the three-phase bridge full-control rectifier circuit, calculate the control angle α according to the output DC voltage U _F and the output voltage reference value U _ref , and adjust the control angle α in real time to control the three-phase bridge full-control The output DC voltage U _F of the rectification circuit.

Preferably, when the control angle α increases, the output DC voltage U _F of the three-phase bridge fully-controlled rectifier circuit decreases, and when the control angle α decreases, the output DC voltage of the three-phase bridge fully-controlled rectifier circuit The voltage U _F increases, so as to adjust the output DC voltage U _F of the three-phase bridge fully controlled rectifier circuit by adjusting the size of the control angle α.

Preferably, a differential proportional regulator or a differential proportional-integral regulator is used to form a closed-loop control of the output voltage, so that when the output DC voltage U _F is greater than the output voltage reference value U _ref , the control angle α increases, and when the output DC voltage U _F is less than the output At the voltage reference value U _ref the control angle α decreases.

Preferably, the real-time value of the three-phase alternating current output by the generator is collected, and the control points of each switching device in the three-phase bridge fully-controlled rectifier circuit are calculated according to the control angle α and the real-time value of the three-phase alternating current output by the generator.

Preferably, the pressure regulation control angle β _i is calculated according to the control angle α, where i=1, 2, 3,...n, n≥6,

When the control angle α>0, the voltage regulation control angle β _i is ahead of the zero-crossing point of the corresponding phase current in the three-phase current output by the generator;

When the control angle α<0, the voltage regulation control angle β _i lags behind the current zero-crossing point of the corresponding phase in the three-phase current output by the generator;

The control angle α=0, the voltage regulation control angle β _i coincides with the current zero-crossing point of the corresponding phase of the three-phase current output by the generator.

Preferably, n=6, and the U-phase voltage regulation control angles are the voltage regulation control angle β ₁ and the voltage regulation control angle β ₄ in turn, and the V-phase voltage regulation control angles are the voltage regulation control angle β ₂ and the voltage regulation control angle in turn β ₅ , the W-phase voltage regulation control angle is the voltage regulation control angle β ₃ and the voltage regulation control angle β ₆ in turn;

When the U-phase current I _U changes to the voltage regulation control angle β ₁ , the control mode corresponding to the voltage regulation control angle β ₁ is executed, that is, the U-phase upper bridge arm switching device in the three-phase bridge fully controlled rectifier circuit is closed, U The switching device of the bridge arm under the phase is turned on;

When the V-phase current I _v changes to the voltage regulation control angle _β2 , the control mode corresponding to the voltage regulation control angle _β2 is executed, that is, the V-phase upper bridge arm switching device in the three-phase bridge fully controlled rectifier circuit is turned off, V The switching device of the bridge arm under the phase is turned on;

When the W-phase current I _w changes to the voltage regulation control angle _β3 , the control mode corresponding to the voltage regulation control angle _β3 is implemented, that is, the W-phase upper bridge arm switching device in the three-phase bridge fully controlled rectifier circuit is turned off, W The switching device of the bridge arm under the phase is turned on;

When the U-phase current I _U changes to the voltage regulation control angle _β4 , the control mode corresponding to the voltage regulation control angle _β4 is executed, that is, the U-phase upper bridge arm switching device in the three-phase bridge fully controlled rectifier circuit is turned on, The switch device of the lower bridge arm of the U phase is turned off;

When the V-phase current IV changes to the voltage regulation control angle _β5 , the control mode corresponding to the voltage regulation control angle _β5 is executed, that is, the V-phase upper bridge arm switching device is turned on, and the V-phase lower bridge arm switching device is turned off;

When the W-phase current I _W changes to the voltage regulation control angle _β6 , the control mode corresponding to the voltage regulation control angle _β6 is executed, that is, the W-phase upper bridge arm switching device in the three-phase bridge fully controlled rectifier circuit is turned on, The switching device of the lower bridge arm of the W phase is turned off.

Preferably, the zero-crossing point of a certain phase current in the three-phase AC output current of the generator is taken as the starting point, and the calculation is performed on the basis of the control angle α to obtain each voltage regulation control angle β _i , and the distance between each voltage regulation control angle β _i The electrical angle of the sequential phase difference is 360°/ _n , and the electrical angle difference between the various voltage regulation control angles β _i of the same phase is 180°*6/n.

Compared with the prior art, the present invention calculates the control angle α from the output DC voltage U _F and the output voltage reference value U _ref , and then calculates the three-phase bridge full-scale output from the control angle α and the real-time value of the three-phase AC current output by the generator. Control the control points of each switching device in the rectifier circuit, and perform the corresponding on and off operations of the upper and lower bridge arm switching devices of the three-phase bridge fully controlled rectifier circuit, thereby adjusting the output DC voltage U _F ; by continuously adjusting the control angle α The size of , can achieve the purpose of adjusting the output DC voltage _UF . Therefore, the present invention takes the three-phase output current of the generator as the observation object, and according to the current output DC voltage situation, implements specific turn-on and turn-off actions on the six switching devices of the upper and lower bridge arms in the three-phase bridge full-control rectifier circuit, so as to To control the output energy of the three-phase bridge fully-controlled rectifier circuit, and adjust the output current waveform of the generator in the next week. Therefore, the present invention takes the output current of the generator as the observation object, does not require many external signals, and provides a new voltage control mode for the power generation and rectification control system of the locomotive. Control the situation afterwards.

Description of drawings

Fig. 1 is the flowchart of generator voltage regulation and rectification method of the present invention;

Fig. 2 is the position relationship figure of different control angles and three-phase alternating current in the generator voltage regulation and rectification method of the present invention;

Fig. 3 is the control block diagram of the voltage regulating and rectifying system of the generator of the present invention;

Fig. 4 is a schematic diagram of the conduction and closure of each switching device in the three-phase bridge full-control rectification circuit when the control angle α>0 in the generator voltage regulation and rectification method of the present invention;

Fig. 5 is a schematic diagram of the conduction and closure of each switching device in the three-phase bridge full-control rectification circuit when the control angle α=0 in the generator voltage regulation and rectification method of the present invention;

FIG. 6 is a schematic diagram of the on-off of each switching device in the three-phase bridge fully-controlled rectifier circuit when the control angle α<0 in the generator voltage regulation and rectification method of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by those skilled in the art to which the present invention belongs.

"First", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Also, unless the context clearly dictates otherwise, the singular forms "a", "an" or "the" and similar words do not imply a limitation of number but rather mean that there is at least one. "comprises" or "comprises" and similar words mean that the elements or items presented before "comprises" or "comprises" include the features, integers, steps, operations, elements and/or items listed after "comprises" or "comprises" or component, does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or collections thereof. "Up", "Down", "Left" and "Right" are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

The invention provides a generator voltage regulation and rectification method, the generator voltage regulation and rectification method includes a generator and a three-phase bridge full-control rectification circuit, in this specific embodiment, each of the three-phase bridge full-control rectification circuits The upper and lower bridge arms of each phase are MOSFETs as an example to illustrate the generator voltage regulation control method of the present invention, but the voltage regulation control method of the present invention is not only applicable to three-phase generators in which the upper and lower bridge arms of each phase are MOSFET tubes. The bridge type full-control rectification circuit is also applicable to the three-phase bridge type full-control rectification circuit of other structural forms, such as the structural form in which the upper and lower bridge arms of the three phases are IGBTs, etc. The principle of the phase-bridge fully-controlled rectifier circuit is the same as that of the three-phase bridge-type fully-controlled rectifier circuit in which the upper and lower bridge arms of each phase are MOSFET tubes, so for other three-phase bridge-type fully-controlled rectifier circuits No more details will be given in the present invention. Specifically, in the present invention, the three-phase bridge fully-controlled rectification circuit in which the upper and lower bridge arms of each phase are MOSFET tubes includes T1 of the U-phase upper bridge arm, T4 of the U-phase lower bridge arm, and T2 of the V-phase upper bridge arm. , T5 of the lower bridge arm of the V phase, T3 of the upper bridge arm of the W phase, and T6 of the lower bridge arm of the W phase.

As shown in accompanying drawings 1 to 6, the generator voltage regulation and rectification method of the present invention collects the output DC voltage U _F of the three-phase bridge full-control rectification circuit, and according to the output DC voltage U _F and the output voltage reference value U _ref The control angle α is calculated, and the control angle α is adjusted in real time to control the output DC voltage U _F of the three-phase bridge fully-controlled rectifier circuit.

In this specific embodiment, a differential proportional regulator or a differential proportional-integral regulator is used to form a closed-loop control of the output voltage, so that when the output DC voltage U _F is greater than the output voltage reference value U _ref , the control angle α increases, and when the output DC voltage When U _F is smaller than the output voltage reference value U _ref , the control angle α decreases.

Specifically, when a differential proportional regulator is used to form a closed-loop control of the output voltage, the calculation formula for the control angle α is:

α＝k _p ×(U _F -U _ref )

In the formula, U _ref is the output voltage reference value, k _p is the proportional operation parameter; k _p matches the specific value according to the generator and the load system.

When the differential proportional-integral regulator is used to form the output voltage closed-loop control, the calculation formula of the control angle α is:

α＝k _p ×(U _Fk -U _ref )+k _i ×(U _Fk -U _Fk-1 )

In the formula, U _ref is the output voltage reference value, U _Fk is the feedback value of the output DC voltage at the current sampling moment, U _Fk-1 is the feedback value of the output DC voltage at the previous sampling moment, k _p is the proportional operation parameter, and _ki is Integral operation parameters; k _p , _ki match specific values according to generator and load system.

In this specific embodiment, when the control angle α increases, the output DC voltage U _F of the three-phase bridge fully-controlled rectifier circuit decreases, and when the control angle α decreases, the output DC voltage of the three-phase bridge fully-controlled rectifier circuit The voltage U _F increases, so as to adjust the output DC voltage U _F of the three-phase bridge fully controlled rectifier circuit by adjusting the size of the control angle α. Among them, α∈[180°, -180°], the specific range of α depends on the specific project.

In this specific embodiment, the real-time value of the three-phase AC current output by the generator is collected, and the control points of each switching device in the three-phase bridge full-control rectifier circuit are calculated according to the control angle α and the real-time value of the three-phase AC current output by the generator .

In this specific embodiment, the pressure regulation control angle β _i is calculated according to the control angle α, where i=1, 2, 3, ... n, n≥6, in this specific embodiment, n=6 is taken as an example illustrate;

As shown in Figure 1, when the control angle α>0, the voltage regulation control angle β _i is ahead of the zero-crossing point of the corresponding phase current in the three-phase current output by the generator;

When the control angle α<0, the voltage regulation control angle β _i lags behind the current zero-crossing point of the corresponding phase in the three-phase current output by the generator;

The control angle α=0, the voltage regulation control angle β _i coincides with the current zero-crossing point of the corresponding phase in the three-phase current output by the generator.

In this specific embodiment, when calculating the voltage regulation control angle β _i according to the control angle α, the zero-crossing point of a certain phase current in the three-phase AC output current of the generator can be used as the starting point, and the voltage regulation control angle β _i of each phase can be calculated. For unified calculation, the zero-crossing point of each phase current in the three-phase AC output current of the generator can also be used as the starting point, and the voltage regulation control angle β _i can be calculated separately for each phase.

When the zero-crossing point of a certain phase current in the three-phase AC output current of the generator is taken as the starting point, the method for uniform calculation of the voltage regulation control angle β _i of each phase is: to perform a unified calculation of the voltage regulation control angle β _i of each phase, In the calculation, the zero-crossing point of a phase current in the three-phase AC output current of the generator is taken as the starting point, and the control angle α is used as the basis for calculation to obtain each voltage regulation control angle β _i , and the distance between each voltage regulation control angle β _i The electrical angle of the sequential phase difference is 360°/n, and the electrical angle of the voltage regulation control angle β _i of the same phase is 180°*6/n electrical angle. When n=6, the electrical angle difference between each voltage regulation control angle β _i is 60°, and the electrical angle difference between two voltage regulation control angles β _i of the same phase is 180°.

Specifically, this scheme takes the zero-crossing point of the U-phase current as the starting point for unified calculation as an example. At this time, the calculation formula of each voltage regulation control current angle β _i is as follows:

In the formula: β ₁ and β ₄ are the voltage regulation control angles of U phase, β ₂ and β ₅ are the voltage regulation control angles of V phase, β ₃ and β ₆ are the voltage regulation control angles of W phase.

When the zero-crossing point of each phase current in the three-phase AC output current of the generator is taken as the starting point, the method of calculating the voltage regulation control angle β _i separately for each phase is: the voltage regulation control angle β _i is calculated separately for each phase Calculation, the calculation takes the zero-crossing point of each phase current in the three-phase AC output current of the generator as the starting point, and calculates each voltage regulation control angle β _i of the phase on the basis of the control angle α, and the same phase The electrical angle difference between each voltage regulation control angle β _i is 180°*6/n, and when n=6, the electrical angle difference between two voltage regulation control angles β _i of the same phase is 180°.

At this time, the calculation formula of U-phase voltage regulation control current angle is as follows:

The formula for calculating the current angle of V-phase voltage regulation control is as follows:

The formula for calculating the current angle of W-phase voltage regulation control is as follows:

The calculated β _i is used as the control time point of the alternating current cycle of this phase.

In this specific embodiment, n=6, and the U-phase voltage regulation control angles are the voltage regulation control angle β ₁ and the voltage regulation control angle β ₄ in turn, and the V-phase voltage regulation control angles are the voltage regulation control angle β2 and the regulation The voltage control angle β ₅ , the W-phase voltage regulation control angle is the voltage regulation control angle β ₃ and the voltage regulation control angle β ₆ in turn;

When the U-phase current I _U changes to the voltage regulation control angle β ₁ , which is the position ① in the accompanying drawings 3 to 5, the control mode corresponding to the voltage regulation control angle β ₁ is executed, that is, the three-phase bridge full-controlled rectification In the circuit, the switching device T of the upper bridge arm of the U phase is turned off, and the switching device T4 of the lower bridge arm of the U phase is turned on;

When the V-phase current IV changes to the voltage regulation control angle β ₂ , which is the position ② in the accompanying drawings 3 to 5, the control mode corresponding to the voltage regulation control angle β ₂ is executed, that is, the three-phase bridge full-controlled rectifier circuit The V-phase upper bridge arm switching device T2 is turned off, and the V-phase lower bridge arm switching device T5 is turned on;

When the W-phase current I _W changes to the voltage regulation control angle β ₃ , which is the position ③ in Figure 3 to Figure 5, the control mode corresponding to the voltage regulation control angle β ₃ is executed, that is, three-phase bridge full-control rectification In the circuit, the switching device T3 of the upper bridge arm of the W phase is turned off, and the switching device T6 of the lower bridge arm of the W phase is turned on;

When the U-phase current I _U changes to the voltage regulation control angle β ₄ , which is the position ④ in the accompanying drawings 3 to 5, the control mode corresponding to the voltage regulation control angle β ₄ is executed, that is, the three-phase bridge full-controlled rectification In the circuit, the switching device T1 of the upper bridge arm of the U phase is turned on, and the switching device T4 of the lower bridge arm of the U phase is turned off;

When the V-phase current IV changes to the voltage regulation control angle β ₅ , which is the position ⑤ in the accompanying drawings 3 to 5, the control mode corresponding to the voltage regulation control angle β ₅ is executed, that is, the V-phase upper bridge arm switching device T2 conduction, and the V-phase lower bridge arm switching device T5 is turned off;

When the W-phase current I _W changes to the voltage regulation control angle β ₆ , which is the position ⑥ in Fig. 3 to Fig. 5 , the control mode corresponding to the voltage regulation control angle β ₆ is executed, that is, three-phase bridge full-control rectification In the circuit, the switching device T3 of the upper bridge arm of the W phase is turned on, and the switching device T6 of the lower bridge arm of the W phase is turned off.

In addition, the present invention also provides a system for implementing the above generator voltage regulation and rectification method, which also includes a voltage sampling module, a voltage regulation module, a control point generation module and a drive module;

The voltage sampling module is used to collect the output DC voltage U _F of the three-phase bridge fully-controlled rectifier circuit and send it to the voltage regulation module;

The voltage regulation module is used to calculate the control angle α according to the output DC voltage U _F and the output voltage reference value U _ref and send it to the control point production module;

The control point generation module is used to generate the control signals of each switching device in the three-phase bridge full-control rectification circuit according to the obtained real-time value of the three-phase AC current output by the generator and the control angle α, and send it to the drive module;

The drive module is used to send control signals to the upper and lower bridge arm switching devices of the corresponding phase in the three-phase bridge fully controlled rectifier circuit, so as to realize the conduction and shutdown of the corresponding phase upper and lower bridge arm switching devices.

Specifically, the acquisition method of the real-time value of the three-phase AC current output by the generator is: connect the current sensor in series between the AC input and the three-phase bridge fully-controlled rectifier circuit, and use a current sensor for each phase, so that it can be directly passed The current sensor obtains the real-time value of the three-phase alternating current output by the generator. Certainly, when actually collecting the real-time value of the three-phase alternating current, other feasible methods can also be adopted.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than limit the technical solutions. Those skilled in the art should understand that those who modify or replace the technical solutions of the present invention without departing from the present technology The purpose and scope of the scheme should be included in the scope of the claims of the present invention.

Claims (7)

1. A voltage-regulating rectification method of a generator comprises the generator and a three-phase bridge type full-control rectification circuit, and is characterized in that,

collecting output direct current voltage U of the three-phase bridge type full-control rectification circuit _F According to the output DC voltage U _F And an output voltage reference value U _ref Calculating to obtain a control angle alpha, and adjusting the control angle alpha in real time to control the output direct current voltage U of the three-phase bridge type full-control rectification circuit _F 。

2. The voltage-regulating rectification method for the generator according to claim 1, wherein when the control angle alpha is increased, the output direct-current voltage U of the three-phase bridge type fully-controlled rectification circuit is increased _F When the control angle alpha is reduced, the output direct current voltage U of the three-phase bridge type full-control rectification circuit is reduced _F Increasing the output direct current voltage U of the three-phase bridge type fully-controlled rectifying circuit by adjusting the size of the control angle alpha _F 。

3. The voltage-regulating rectification method of the generator as claimed in claim 2, characterized in that a differential proportional regulator or a differential proportional-integral regulator is adopted to form the output voltage closed-loop control, so that when the output direct-current voltage U is output, the output direct-current voltage U is enabled to be U _F Greater than the output voltage reference value U _ref When the control angle alpha is increased, the DC voltage U is output _F Less than the output voltage reference value U _ref As time goes on, the control angle α decreases.

4. The generator voltage regulation and rectification method according to claim 1, wherein a real-time value of three-phase alternating current output by a generator is acquired, and control points of switching devices in the three-phase bridge full-control rectification circuit are calculated according to a control angle alpha and the real-time value of the three-phase alternating current output by the generator.

5. The generator voltage regulation rectification method of claim 1 wherein the voltage regulation control angle β is calculated from the control angle α _i Wherein i =1, 2, 3, … … n, n ≧ 6,

control angle alpha>At 0, the control angle of pressure regulation is beta _i Advancing a zero crossing point of a corresponding phase current in a three-phase current output by the generator;

control angle alpha<At 0, the control angle of pressure regulation is beta _i Lagging behind the current zero crossing point of the corresponding phase in the three-phase current output by the generator;

control angle α =0, voltage-regulating control angle β _i Coinciding with the current zero crossing point of the corresponding phase in the three-phase current output by the generator。

6. The voltage-regulating rectification method for the generator according to claim 1, wherein n =6 is taken, and the U-phase voltage-regulating control angles are sequentially the voltage-regulating control angle β ₁ And a voltage regulation control angle beta ₄ The V-phase voltage regulation control angle is sequentially a voltage regulation control angle beta ₂ And a voltage regulation control angle beta ₅ The W-phase voltage regulation control angle is sequentially a voltage regulation control angle beta ₃ And a voltage regulation control angle beta ₆ ；

When current I of U-phase _U To a voltage-regulating control angle beta ₁ While, executing and regulating the control angle beta ₁ The corresponding control mode is that a U-phase upper bridge arm switching device in the three-phase bridge type full-control rectification circuit is closed, and a U-phase lower bridge arm switching device is conducted;

when the current of V phase is I _V To a voltage-regulating control angle beta ₂ While, executing and regulating the control angle beta ₂ The corresponding control mode is that a V-phase upper bridge arm switching device in the three-phase bridge full-control rectification circuit is closed, and a V-phase lower bridge arm switching device is conducted;

when the W phase current I _W To a voltage-regulating control angle beta ₃ While, executing and regulating the control angle beta ₃ The corresponding control mode is that a W-phase upper bridge arm switching device in the three-phase bridge full-control rectification circuit is closed, and a W-phase lower bridge arm switching device is conducted;

when the U phase current I _U To a voltage-regulating control angle beta ₄ While, executing and regulating the control angle beta ₄ The corresponding control mode is that a U-phase upper bridge arm switching device in the three-phase bridge full-control rectification circuit is switched on, and a U-phase lower bridge arm switching device is switched off;

when the current of V phase is I _V To a voltage-regulating control angle beta ₅ While, executing and regulating the control angle beta ₅ The corresponding control mode is that the V-phase upper bridge arm switching device is conducted, and the V-phase lower bridge arm switching device is closed;

when the W phase current I _W To a regulated control angle beta ₆ While, executing and regulating the control angle beta ₆ Corresponding control modes, i.e. the W-phase upper bridge arm switching device is on and the W-phase lower bridge arm switching device in the three-phase bridge full-control rectification circuitAnd closing.

7. The voltage-regulating rectification method of the generator according to claim 5, characterized in that each voltage-regulating control angle β is calculated based on the control angle α with the zero-crossing point of a phase current in the three-phase AC output current of the generator as a starting point _i Each voltage regulation control angle beta _i The electrical angle between the two phases is 360 DEG/n, and each voltage regulating control angle beta of the same phase _i The electrical angle of the phase difference is 180 degrees 6/n.

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