CN112350591B - Triggering method of three-phase bridge type thyristor rectification circuit - Google Patents
Triggering method of three-phase bridge type thyristor rectification circuit Download PDFInfo
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- CN112350591B CN112350591B CN202011200769.XA CN202011200769A CN112350591B CN 112350591 B CN112350591 B CN 112350591B CN 202011200769 A CN202011200769 A CN 202011200769A CN 112350591 B CN112350591 B CN 112350591B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000001502 supplementing effect Effects 0.000 claims description 11
- 230000001960 triggered effect Effects 0.000 claims description 11
- 230000000295 complement effect Effects 0.000 claims 1
- 230000001939 inductive effect Effects 0.000 abstract description 3
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 101100079104 Schizosaccharomyces pombe (strain 972 / ATCC 24843) arm1 gene Proteins 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000819 phase cycle Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of AC power input into DC 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 thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of AC power input into DC 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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/162—Conversion of AC power input into DC 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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
- H02M7/1623—Conversion of AC power input into DC 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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The triggering method of the three-phase bridge type thyristor rectifying circuit enables the thyristor rectifying unit to always keep a reverse current path through the control of pulse time sequence, thereby avoiding the problems that the induced voltage caused by load inductance components breaks down bridge arms when the unit trips or current is suddenly changed due to other reasons, or the current is discontinuous under the condition that the rectifying bridge is in series connection and works under deep control. The invention is applied to the reverse cut-off thyristor three-phase bridge rectifier circuit, can directly connect the three-phase thyristor rectifier bridges in series without increasing system hardware, and can effectively improve the safety under inductive load conditions, especially under heavy current operation.
Description
Technical Field
The invention relates to a triggering method of a three-phase bridge type thyristor rectifying circuit.
Background
The thyristor rectifier unit has wide application, the three-phase full-control bridge rectifier circuit is widely adopted, and the output can be adjusted in a large range through a phase control mode. The signal for controlling the thyristor is usually a double narrow pulse sequence, and the output adjustment function is realized through the phase control of the pulse sequence, and the triggering mode is especially used for a high-power rectifying device.
When the rectifying output has inductive load, if conditions such as AC tripping are met, the voltage at the input end of the bridge circuit is suddenly changed, and the inductance at the load end releases magnetic energy to generate higher back pressure, so that the bridge circuit bears larger voltage impact and is easy to break down and damage. In high power rectifying sites, this cause may have serious consequences. The manner of connecting the freewheeling arms of the diodes in parallel in theory is of little practical value because of the cost and reliability issues.
Another case is a rectifier bridge in series. Higher output voltages can be obtained by series connection of series connected rectifier bridges (or devices). Meanwhile, in order to reduce harmonic interference caused by rectification, the input ends of different bridges are subjected to phase shifting. When the device is controlled deeply, the output current of the single bridge circuit is discontinuous, the thyristor enters a cut-off state, and the output of the other bridge circuit connected in series is blocked, so that the series circuit works abnormally. A common solution is to add a freewheeling diode or freewheeling diode leg. However, when the output current increases, the capacity of the shunt tube increases greatly, which causes various problems such as cost, volume and weight.
Disclosure of Invention
The invention aims to provide a triggering method of a three-phase bridge type thyristor rectifying circuit, which enables a thyristor rectifying unit to always keep a reverse current path through pulse time sequence control, thereby avoiding the problems that induced voltage is broken down by a load inductance component when the unit trips or current is suddenly changed due to other reasons, or current is discontinuous when a rectifying bridge is in series connection and works under the deep control condition.
The technical scheme adopted for achieving the purpose is that the triggering method of the three-phase bridge type thyristor rectifying circuit comprises three half-bridges consisting of a bridge arm 1, a bridge arm 4, a bridge arm 3, a bridge arm 6, a bridge arm 5 and a bridge arm 2, wherein the midpoint of each half-bridge is connected with one phase of alternating current input; the triggering method is characterized in that the thyristor rectifier unit can always keep a reverse current path through the control of a pulse time sequence, and the triggering method comprises the following steps:
1）t 0 at moment, the bridge arm 1 is switched on in a commutation way, the bridge arm 6 carries out pulse supplementing, the pulse of the bridge arm 1 is continuous, meanwhile, the corresponding bridge arm 4 of the bridge arm 1 is opened and continuously triggered, and under the normal rectification condition, the bridge arm 4 is in a reverse bias state and cannot be conducted, so that the output of a bridge circuit is not influenced;
2）t 1 at moment, bridge arm 2 commutates and opens, bridge arm 1 carries out pulse supplementing, and bridge arm 2 pulse continues, at this time, the continuation of bridge arm 4 is closedThe flow trigger pulse, the bridge arm 4 exits from the follow current standby state, the corresponding bridge arm 5 of the bridge arm 2 is opened and continuously triggered, and under the normal rectification condition, the bridge arm 5 is in the reverse bias state and cannot be conducted, so that the bridge output is not influenced;
3) And repeating the phase change process to realize continuous work.
Advantageous effects
Compared with the prior art, the invention has the following advantages.
1) The invention does not need to modify the main power circuit, saves the cost of the follow current circuit, and has obvious cost saving for high-power application;
2) Because the working characteristics of the pulse trigger power circuit are that the power reserve is large, the pulse trigger circuit is not required to be improved under most conditions, and even if the pulse trigger circuit is required to be improved, the cost investment of the part is quite limited;
3) Particularly, for the occasion of large current rectification, the additional inductance of the circuit greatly affects the main loop, and the parallel freewheel circuit can face a large risk.
Drawings
The present invention is described in further detail below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a background application circuit of the present invention;
FIG. 2 is a schematic diagram of a pulse sequence of a conventional dual narrow pulse triggering scheme;
fig. 3 is a schematic diagram of a pulse sequence of the triggering method according to the present invention.
Description of the embodiments
The triggering method of the three-phase bridge type thyristor rectification circuit is shown in fig. 3, wherein the three-phase bridge type rectification circuit comprises three half-bridges consisting of a bridge arm 1, a bridge arm 4, a bridge arm 3, a bridge arm 6, a bridge arm 5 and a bridge arm 2, and the midpoint of each half-bridge is connected with one phase of alternating current input, as shown in fig. 1; according to the triggering method, through control of pulse time sequence, a thyristor rectifier unit can always keep a reverse current path, and the method comprises the following steps:
1）t 0 moment, bridge arm1 commutation is conducted, the bridge arm 6 carries out pulse supplementing, the pulse of the bridge arm 1 is continuous, meanwhile, the corresponding bridge arm 4 of the bridge arm 1 is opened and continuously triggered, and under the normal rectification condition, the bridge arm 4 is in a reverse bias state and cannot be conducted, so that the bridge output is not influenced;
2）t 1 at moment, the bridge arm 2 is switched on in a commutation way, the bridge arm 1 carries out pulse supplementing, the bridge arm 2 continues to pulse, at the moment, the follow current trigger pulse of the bridge arm 4 is closed, the bridge arm 4 exits from the follow current standby state, meanwhile, the corresponding bridge arm 5 of the bridge arm 2 is opened and continues to trigger, and under the normal rectification condition, the bridge arm 5 is in a reverse bias state and cannot be conducted, so that the bridge output cannot be influenced;
3) And repeating the phase change process to realize continuous work.
The invention adds a self-freewheeling trigger pulse sequence based on the traditional trigger pulse sequence.
By applying trigger pulse to the bridge arm of the reverse bias, the original phase-shifting adjustment control capability of the main circuit is ensured, and a follow current channel of external current can be provided. The main loop can still be output in series during deep control operation without adding a follow current circuit. No additional main loop hardware is required to implement the above functions.
As shown in fig. 1, in the background application circuit of the invention, the standard three-phase rectifier bridge has digital serial numbers Q1 to Q6 respectively representing 6 bridge arms, and the digital sequence is the phase sequence of trigger sequence, and the regulation of the rectification output is realized by controlling the pulse sequence of the bridge arms.
As shown in the figure, the pulse sequence is a traditional double-narrow pulse triggering mode, the horizontal axis is a time coordinate, and bridge arm numbers 1-6 respectively correspond to Q1-Q6 in FIG. 1. Synchronizing points to t 0 The time distance between the two is the control angle, the phase control is realized through the adjustment of the control angle, the bridge circuit is fully opened when the control angle is 0, which is equivalent to the diode rectifying circuit, and the output of the bridge circuit is zero when the control angle is at the maximum value of the phase-shiftable range. t is t 0 ~t 5 The phase change points are 6 phase change points of the rectifier bridge respectively, and the interval is 60 degrees.
As shown in fig. 3, a pulse train for the triggering mode of the present invention, as can be seen from the figure,on the basis of double narrow pulses, a wider new pulse sequence is added, and along with a commutation rule, the upper arm and the lower arm of a half bridge are continuously in a trigger state at the same time. In agreement with FIG. 2, t 0 ~t 5 The phase change points are 6 phase change points of the rectifier bridge respectively, and the interval is 60 degrees. The phase change occurs in both the on bridge arm and the follow current bridge arm.
1.t 0 At moment, the bridge arm 1 commutates and opens, and the bridge arm 6 carries out pulse supplementing. The pulse of the bridge arm 1 is continuous, and meanwhile, the corresponding bridge arm 4 of the bridge arm 1 is opened and continuously triggered. Under the normal rectification condition, the bridge arm 4 is in a reverse bias state and cannot be conducted, so that the bridge output cannot be influenced.
2.t 1 At moment, the bridge arm 2 is switched on in a commutation way, and the bridge arm 1 carries out pulse supplementing. The pulse of the bridge arm 2 continues, at the moment, the follow current trigger pulse of the bridge arm 4 is closed, the bridge arm 4 exits from the follow current standby state, and meanwhile, the corresponding bridge arm 5 of the bridge arm 2 is opened and continuously triggered. Under the normal rectification condition, the bridge arm 5 is in a reverse bias state and cannot be conducted, so that the bridge output cannot be influenced.
3. And similar phase change process is repeated, so that continuous work is realized.
4. When the bridge input suddenly drops, the load inductance component will generate a reverse induced voltage across the rectified output in order to maintain the output loop current unchanged. If this phenomenon occurs at t 0 ~t 1 During the period, the voltage will cause the freewheeling arm Q4 to conduct, forming a through path with the bridge arm Q1 at both ends of the rectified output, discharging the inductive energy, and clamping the induced voltage at a lower level. If input drop occurs in other periods, the same process can also occur in the corresponding bridge arm, so that the induced voltage is prevented from damaging the rectifying circuit.
5. When the thyristor rectifier bridge is used in series connection, it must be ensured that all the bridge circuits in series connection have current channels to output normally, so if one bridge is in a state of discontinuous current operation, the output may be interrupted, and thus the circuit has no continuous regulation capability and cannot be independently regulated in a deep control state. To solve this problem, it is generally necessary to reverse the freewheeling diode at each rectifier bridge output. However, after the triggering mode provided by the invention is adopted, the problem of series connection application can be solved because the rectifier bridge is provided with the current channel in the correct direction at any time.
In the thyristor rectification application case, the application scene exists widely, so that the invention has better application and popularization significance.
Claims (1)
1. The triggering method of the three-phase bridge type thyristor rectification circuit comprises 3 half-bridges consisting of an upper bridge arm 1, a lower bridge arm 4, an upper bridge arm 3, a lower bridge arm 6, an upper bridge arm 5 and a lower bridge arm 2, wherein the midpoint of each half-bridge is connected with 1 phase of alternating current input; the triggering method is characterized in that the thyristor rectifier unit can always keep a reverse current path through the control of pulse time sequence, and specifically comprises the following steps:
1）t 0 at moment, the upper bridge arm 1 is switched on in a commutation way, the lower bridge arm 6 carries out pulse supplementing, the upper bridge arm 1 continues to pulse, the corresponding lower bridge arm 4 of the upper bridge arm 1 is opened and continuously triggered, and under the normal rectification condition, the lower bridge arm 4 is in a reverse bias state and cannot be conducted, so that the bridge output is not influenced;
2）t 1 at moment, the lower bridge arm 2 is switched on in a commutation way, the upper bridge arm 1 carries out pulse supplementing, the lower bridge arm 2 continues to pulse, at the moment, the follow current trigger pulse of the lower bridge arm 4 is closed, the lower bridge arm 4 exits from the follow current standby state, the corresponding upper bridge arm 5 of the lower bridge arm 2 is opened and continuously triggered, and under the normal rectification condition, the upper bridge arm 5 is in a reverse bias state and cannot be conducted, so that the bridge output is not influenced;
3）t 2 at moment, the upper bridge arm 3 commutates and opens, the lower bridge arm 2 carries out pulse supplementing, the upper bridge arm 3 continues to pulse, at the moment, the follow current trigger pulse of the upper bridge arm 5 is closed, and meanwhile, the lower bridge arm 6 corresponding to the upper bridge arm 3 is opened and continuously triggered to carry out follow current;
4）t 3 at moment, the lower bridge arm 4 commutates and opens, the upper bridge arm 3 carries out pulse supplementing, the lower bridge arm 4 continues to pulse, at the moment, the follow current trigger pulse of the lower bridge arm 6 is closed, and meanwhile, the upper bridge arm 1 is continuously triggered to finish follow current;
5）t 4 at moment, the upper bridge arm 5 is switched on in a commutation way, and the lower bridge arm 4 is switched inThe line complement pulse, the upper bridge arm 5 pulse continues, at the moment, the follow current trigger pulse of the upper bridge arm 1 is closed, and simultaneously the lower bridge arm 2 is continuously triggered to finish follow current;
6）t 5 at the moment, the lower bridge arm 6 is switched on in a commutation way, the upper bridge arm 5 carries out pulse supplementing, the lower bridge arm 6 continues to pulse, at the moment, the follow current trigger pulse of the lower bridge arm 2 is closed, meanwhile, the upper bridge arm 3 is continuously triggered to finish follow current, and the trigger pulse of the upper bridge arm 3 is closed at the beginning moment of the next period;
7) Repeating the phase change process to realize continuous work.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011200769.XA CN112350591B (en) | 2020-11-02 | 2020-11-02 | Triggering method of three-phase bridge type thyristor rectification circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011200769.XA CN112350591B (en) | 2020-11-02 | 2020-11-02 | Triggering method of three-phase bridge type thyristor rectification circuit |
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| CN112350591A CN112350591A (en) | 2021-02-09 |
| CN112350591B true CN112350591B (en) | 2023-07-21 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1157631A1 (en) * | 1983-03-18 | 1985-05-23 | Всесоюзный научно-исследовательский, проектно-конструкторский и технологический институт электровозостроения | Device for controlling multibridge thyristor converter |
| CN85101943A (en) * | 1985-04-01 | 1986-09-03 | 浙江大学 | Microcomputer System for Controlling Thyristor Medium Frequency Power Supply |
| JP2005066603A (en) * | 2003-07-01 | 2005-03-17 | Daihen Corp | Plasma arc power supply device |
| CN105391319A (en) * | 2015-10-19 | 2016-03-09 | 株洲变流技术国家工程研究中心有限公司 | High-voltage cascade thyristor rectification circuit photoelectric triggering system and high-voltage cascade thyristor rectification circuit photoelectric triggering method |
| CN210041669U (en) * | 2019-07-03 | 2020-02-07 | 华北电力大学 | Phase-selective rectifier device for six-phase power supply |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3998624B2 (en) * | 2003-10-09 | 2007-10-31 | Ｎｅｃエレクトロニクス株式会社 | Pulse width modulation waveform generation method and apparatus |
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2020
- 2020-11-02 CN CN202011200769.XA patent/CN112350591B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1157631A1 (en) * | 1983-03-18 | 1985-05-23 | Всесоюзный научно-исследовательский, проектно-конструкторский и технологический институт электровозостроения | Device for controlling multibridge thyristor converter |
| CN85101943A (en) * | 1985-04-01 | 1986-09-03 | 浙江大学 | Microcomputer System for Controlling Thyristor Medium Frequency Power Supply |
| JP2005066603A (en) * | 2003-07-01 | 2005-03-17 | Daihen Corp | Plasma arc power supply device |
| CN105391319A (en) * | 2015-10-19 | 2016-03-09 | 株洲变流技术国家工程研究中心有限公司 | High-voltage cascade thyristor rectification circuit photoelectric triggering system and high-voltage cascade thyristor rectification circuit photoelectric triggering method |
| CN210041669U (en) * | 2019-07-03 | 2020-02-07 | 华北电力大学 | Phase-selective rectifier device for six-phase power supply |
Non-Patent Citations (1)
| Title |
|---|
| 三相桥式全控整流直流电源控制电路设计浅析;张红勇，方军;《电源技术》;第38卷(第11期);全文 * |
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