CN111953251A - Traction converter direct-current side voltage stability control method - Google Patents
Traction converter direct-current side voltage stability control method Download PDFInfo
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- CN111953251A CN111953251A CN202010808102.1A CN202010808102A CN111953251A CN 111953251 A CN111953251 A CN 111953251A CN 202010808102 A CN202010808102 A CN 202010808102A CN 111953251 A CN111953251 A CN 111953251A
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- voltage
- torque
- direct current
- current side
- component
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000010355 oscillation Effects 0.000 claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims abstract description 14
- 230000033228 biological regulation Effects 0.000 claims abstract description 4
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 238000004364 calculation method Methods 0.000 claims description 2
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/05—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation specially adapted for damping motor oscillations, e.g. for reducing hunting
-
- 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/143—Arrangements for reducing ripples from dc input or output using compensating arrangements
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/04—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for damping motor oscillations, e.g. for reducing hunting
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/50—Reduction of harmonics
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses a method for controlling the voltage stability of a direct current side of a traction converter, which comprises the following steps: the traction converter obtains the voltage of a direct current side capacitor; filtering the direct current side capacitor voltage to obtain a direct current component of the direct current side capacitor voltage; calculating the oscillation component of the direct-current side capacitor voltage, and calculating the influence factor of the oscillation component on the voltage; in the torque control, calculating the influence factors of the torque component voltage output by the current loop decoupling part on the DC side voltage; and feeding forward the voltage oscillation component of the direct-current side capacitor voltage and the voltage of the output torque component to a torque control command to realize feed-forward regulation so as to obtain a corrected torque command. The invention adopts two modes of influencing factors to feed forward the compensation torque, realizes the aim of inhibiting the voltage fluctuation oscillation at the direct current side of the traction converter, and can effectively inhibit the continuous oscillation phenomenon in the running process of controlling the motor by the traction converter.
Description
Technical Field
The invention relates to a method for stably controlling the voltage of a direct current side of a traction converter.
Background
The front end of the traction converter is supplied with direct current, and the rear end of the traction converter is provided with a three-phase alternating current output belt traction motor. In the design process, a filter reactor and a support capacitor are added on the direct current side of the converter to suppress the oscillation phenomenon which may occur to the voltage and the current on the direct current side when the converter operates, wherein the oscillation is caused by unstable negative impedance on the direct current side and low system damping when the system operates. The oscillation of the direct current side can not only cause the instability of the output torque of the motor, greatly reduce the control performance of the converter on the traction motor, but also influence the function and the stability of the whole electric transmission system. The oscillation phenomenon cannot be completely solved by only adding a filter reactance and a support capacitor on a hardware circuit, so that a stable control strategy needs to be adopted for the direct current side voltage to inhibit the direct current voltage oscillation in the control operation process of the traction converter.
Disclosure of Invention
In order to solve the technical problems, the invention provides a traction converter direct-current side voltage stability control method which is simple in algorithm and stable and reliable in work.
The technical scheme for solving the problems is as follows: a method for controlling voltage stability of a direct current side of a traction converter comprises the following steps:
the method comprises the following steps: firstly, a traction converter obtains a capacitance voltage U at a direct current side through a voltage sensor at the direct current sidedc；
Step two: using low-pass filters for UdcFiltering to obtain DC component U of DC side capacitor voltagedc_fil；
Step three: calculating oscillation component delta U of direct current side capacitor voltagedc＝Udc-Udc_filAnd calculating the influence factor k of the oscillation component on the voltage1＝ΔUdc/Udc；
Step four: in torque control, a torque component voltage V output by a current loop decoupling part is calculatedqFor voltages on the DC sideThe influencing factors are as follows: k is a radical of2＝Vq/Udc；
Step five: feedforward the direct current side capacitance voltage oscillation component and the output torque component voltage to a torque control command to realize feedforward regulation, wherein the corrected torque command is as follows:
wherein,
as a torque command, Te1For the corrected torque command, krIs a compensation factor.
In the fifth step, the feedforward control of the torque is replaced by the feedforward control of the torque current, that is, the influencing factor k is replaced1、k2Feed-forward to torque current, since torque current
Is that by
The result of the calculation is that,
wherein,
as a torque current command, isq1Is the corrected torque current command.
The invention has the beneficial effects that: when the traction converter runs, the voltage of the direct current side is monitored in real time, oscillation component factors of the voltage of the direct current side are extracted, torque control component factors output by a current loop are extracted, the torque is corrected through feedforward compensation, and the reduced damping of the direct current side is compensated through torque adjustment, so that the voltage oscillation of the direct current side can be inhibited, and the voltage of the direct current side is kept stable; the whole algorithm is simple, the calculated amount is small, the accuracy is high, the continuous oscillation phenomenon in the operation process of the traction converter control motor can be effectively inhibited, and the stable output of the power transmission system is effectively ensured.
Drawings
FIG. 1 is a schematic diagram of a feedforward compensation to torque control method of the present invention.
FIG. 2 is a schematic diagram of the control method of feedforward compensation to torque current according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, a method for controlling voltage stabilization of a dc side of a traction converter includes the following steps:
the method comprises the following steps: firstly, a traction converter obtains a capacitance voltage U at a direct current side through a voltage sensor at the direct current sidedc；
Step two: using low pass filter to pair U in step onedcFiltering to obtain DC component U of DC side capacitor voltagedc_fil；
Step three: calculating oscillation component delta U of direct current side capacitor voltagedc＝Udc-Udc_filAnd calculating the influence factor k of the oscillation component on the voltage1＝ΔUdc/Udc；
Step four: in torque control, a torque component voltage V output by a current loop decoupling part is calculatedqInfluence factors on the dc side voltage: k is a radical of2＝Vq/Udc；
Step five: feedforward the direct current side capacitance voltage oscillation component and the output torque component voltage to a torque control command to realize feedforward regulation, wherein the corrected torque command is as follows:
wherein,
as a torque command, Te1For the corrected torque command, krFor compensating the coefficient, fine adjustment can be carried out according to the actual fluctuation condition.
As shown in fig. 2, a control method of feed forward compensation to the torque current may be used, which differs only in that in step five, the feed forward control of the torque is replaced by a feed forward control of the torque current, i.e. the influencing factor k1、k2Feed-forward to torque current, since torque current
Is that by
Calculated, and therefore equally effective;
wherein,
as a torque current command, isq1Is the corrected torque current command.
Claims (2)
1. A method for controlling voltage stability of a direct current side of a traction converter is characterized by comprising the following steps:
the method comprises the following steps: firstly, a traction converter obtains a capacitance voltage U at a direct current side through a voltage sensor at the direct current sidedc；
Step two: using low-pass filters for UdcFiltering to obtain DC component U of DC side capacitor voltagedc_fil；
Step three: calculating oscillation component delta U of direct current side capacitor voltagedc＝Udc-Udc_filAnd calculating the influence factor k of the oscillation component on the voltage1＝ΔUdc/Udc；
Step four: in torque control, a torque component voltage V output by a current loop decoupling part is calculatedqInfluence factors on the dc side voltage: k is a radical of2＝Vq/Udc；
Step five: the voltage oscillation component of the capacitor on the DC side and the voltage of the output torque component are fed forward to a torque control command to realize feed forward regulation and correctedThe torque command is:
wherein,
as a torque command, Te1For the corrected torque command, krIs a compensation factor.
2. The traction converter direct current side voltage stabilization control method according to claim 1, wherein in the fifth step, the feedforward control of the torque is replaced by the feedforward control of the torque current, namely, the influencing factor k1、k2Feed-forward to torque current, since torque current
Is that by
The result of the calculation is that,
wherein,
as a torque current command, isq1Is the corrected torque current command.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010808102.1A CN111953251A (en) | 2020-08-12 | 2020-08-12 | Traction converter direct-current side voltage stability control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010808102.1A CN111953251A (en) | 2020-08-12 | 2020-08-12 | Traction converter direct-current side voltage stability control method |
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| Publication Number | Publication Date |
|---|---|
| CN111953251A true CN111953251A (en) | 2020-11-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010808102.1A Withdrawn CN111953251A (en) | 2020-08-12 | 2020-08-12 | Traction converter direct-current side voltage stability control method |
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| Country | Link |
|---|---|
| CN (1) | CN111953251A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737457A (en) * | 2020-12-25 | 2021-04-30 | 中车永济电机有限公司 | Stability control method of permanent magnet auxiliary synchronous reluctance motor |
| CN112737445A (en) * | 2020-12-25 | 2021-04-30 | 中车永济电机有限公司 | Control method for oscillation suppression of permanent magnet auxiliary synchronous reluctance motor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5734249A (en) * | 1996-04-01 | 1998-03-31 | Asea Brown Boveri Ag | Method and apparatus for direct torque control of a three-phase machine |
| US20140049197A1 (en) * | 2011-04-18 | 2014-02-20 | Mitsubishi Electric Corporation | Control apparatus for ac motor |
| CN107370163A (en) * | 2017-07-04 | 2017-11-21 | 中车大连电力牵引研发中心有限公司 | Suppress the method, apparatus and trailer system of traction convertor DC bus-bar voltage vibration |
-
2020
- 2020-08-12 CN CN202010808102.1A patent/CN111953251A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5734249A (en) * | 1996-04-01 | 1998-03-31 | Asea Brown Boveri Ag | Method and apparatus for direct torque control of a three-phase machine |
| US20140049197A1 (en) * | 2011-04-18 | 2014-02-20 | Mitsubishi Electric Corporation | Control apparatus for ac motor |
| CN107370163A (en) * | 2017-07-04 | 2017-11-21 | 中车大连电力牵引研发中心有限公司 | Suppress the method, apparatus and trailer system of traction convertor DC bus-bar voltage vibration |
Non-Patent Citations (1)
| Title |
|---|
| 张静萌等: "电力工程车直流侧电压稳定控制策略", 《科技创新与应用》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737457A (en) * | 2020-12-25 | 2021-04-30 | 中车永济电机有限公司 | Stability control method of permanent magnet auxiliary synchronous reluctance motor |
| CN112737445A (en) * | 2020-12-25 | 2021-04-30 | 中车永济电机有限公司 | Control method for oscillation suppression of permanent magnet auxiliary synchronous reluctance motor |
| CN112737445B (en) * | 2020-12-25 | 2022-11-22 | 中车永济电机有限公司 | Control method for oscillation suppression of permanent magnet auxiliary synchronous reluctance motor |
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