CN109217376B - Synchronous switching-on control method of subway brake feedback converter - Google Patents
Synchronous switching-on control method of subway brake feedback converter Download PDFInfo
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- CN109217376B CN109217376B CN201811189290.3A CN201811189290A CN109217376B CN 109217376 B CN109217376 B CN 109217376B CN 201811189290 A CN201811189290 A CN 201811189290A CN 109217376 B CN109217376 B CN 109217376B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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Abstract
The invention relates to a synchronous closing control method of a subway brake feedback converter, and belongs to the field of subway power supply control. The synchronous closing control comprises the following steps: after receiving a starting signal of the feedback converter, controlling the AC side of the feedback converter to be switched on; if the difference value between the direct-current contact network voltage and the direct-current side voltage of the feedback converter is smaller than a set threshold value, directly entering the direct-current side switching-on operation of the feedback converter; and if the difference between the direct-current contact network voltage and the direct-current side voltage of the feedback converter is larger than or equal to the set threshold, controlling the feedback converter to perform direct-current synchronous voltage stabilization operation on the direct-current side voltage of the feedback converter, enabling the difference between the direct-current contact network voltage and the direct-current side voltage of the feedback converter to be smaller than the set threshold, and then entering the direct-current side switching-on operation of the feedback converter. The invention ensures that the direct current contactor is switched on without impact through a software control algorithm, avoids the use of a direct current soft start loop, and reduces the volume of a brake feedback system and the cost of hardware.
Description
Technical Field
The invention relates to a synchronous closing control method of a subway brake feedback converter, and belongs to the field of subway power supply control.
Background
With the rapid development of economy, the urbanization process is accelerated, urban rail transit develops rapidly in recent years, and a series of advantages of large transportation volume, high speed, land saving and the like of subways become effective means for relieving urban traffic jam. A large amount of braking energy can be generated in the operation process of the subway, redundant energy is consumed by the resistor, energy cannot be saved, the burden of a ventilation and heat dissipation system of the urban rail transit line can be increased, the problem of tunnel temperature rise can be relieved through a reasonable braking energy absorption scheme, and good comprehensive economic benefits can be generated through secondary utilization of the energy.
At present, four ways of absorbing the regenerative braking energy of the subway mainly include resistance consumption, capacitance energy storage, inversion feedback, flywheel energy storage and the like, wherein the energy feedback converter based on the inversion way has good energy-saving effect, simple system, stability and reliability and small investment, so that the energy feedback converter is more and more concerned and applied in the industry.
As shown in fig. 1, an access scheme of an existing subway brake feedback system is schematically shown, the subway brake feedback system includes a feedback converter, an isolation transformer, a switch cabinet, and the like, a direct-current contact network on a direct-current side of the feedback converter is connected, an alternating-current side of the feedback converter is connected with a 35kV alternating-current power grid through the isolation transformer, and brake energy can be directly fed back to the 35kV alternating-current power grid.
During the in-service use, subway repayment converter device need place in the tunnel, and the device size needs design according to certain requirement, and the hardware circuit that direct current contact net and repayment converter are connected adopts direct current contactor usually, for avoiding the impulse current of direct current contactor combined floodgate, need be equipped with the soft start return circuit of direct current in-service use, including soft start resistance and soft start contactor. The scheme of adopting the direct-current soft start circuit can increase the volume of the brake feedback system and also increase the hardware cost of the system.
Disclosure of Invention
The invention aims to provide a synchronous switching-on control method of a subway brake feedback converter, which aims to solve the problems of overlarge volume and overhigh cost of the conventional brake feedback system.
In order to achieve the above object, the present invention provides a synchronous closing control method for a subway brake feedback converter, the synchronous closing control method comprising the steps of:
detecting whether a starting signal of the feedback current transformer is received, and if the starting signal of the feedback current transformer is received, performing the following steps;
secondly, controlling the AC side of the feedback converter to be switched on;
if the difference value between the direct-current contact network voltage and the direct-current side voltage of the feedback converter is smaller than a first set threshold value, directly entering the direct-current side switching-on operation of the feedback converter, completing synchronous switching-on of the direct-current side of the feedback converter, and completing the starting operation of the feedback converter; and if the difference between the direct current contact network voltage and the direct current side voltage of the feedback converter is larger than or equal to a first set threshold, controlling the feedback converter to perform direct current synchronous voltage stabilization operation on the direct current side voltage of the feedback converter, enabling the difference between the direct current contact network voltage and the direct current side voltage of the feedback converter to be smaller than a second set threshold, then entering the direct current side switching-on operation of the feedback converter, completing synchronous switching-on of the direct current side of the feedback converter, and completing the starting operation of the feedback converter.
The invention has the beneficial effects that:
the voltage difference between the direct-current side voltage of the feedback converter and the direct-current contactor is directly controlled through a software control algorithm, so that the direct-current side switch-on is not impacted, the use of a direct-current soft start loop is avoided, and the volume of a brake feedback system and the cost of hardware are reduced.
Further, in order to improve the reliability and safety of closing, after the step (one), whether the voltage of the direct current contact network is within the set threshold range of the normal feedback voltage of the direct current contact network is detected, and if the voltage of the direct current contact network is within the threshold range of the normal feedback voltage of the direct current contact network, the step (two) and the step (three) are carried out.
Further, in order to provide an optimal starting signal triggering condition of the feedback current transformer, when the direct current contact network voltage is detected to be higher than a third set threshold value, a starting signal of the feedback current transformer is sent out.
Further, in order to provide an optimal set threshold range of the normal feedback voltage of the direct current overhead line system, the set threshold range of the normal feedback voltage of the direct current overhead line system is 1500V to 1800V.
Further, in order to provide the optimal start signal triggering threshold of the feedback converter, the third set threshold is 1500V.
Drawings
Fig. 1 is a schematic diagram of an access scheme of a conventional subway brake feedback system;
FIG. 2 is a control flow chart of the synchronous closing of a subway brake feedback converter in the embodiment of the invention;
fig. 3 is a schematic diagram of the feedback converter adjusting the dc-side voltage of the feedback converter according to the embodiment of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
Example one
Fig. 2 is a flowchart illustrating a control process for synchronous closing of the subway brake feedback converter according to an embodiment of the present invention.
Aiming at the technical requirements of the switching-on operation of the direct current contactor of the subway feedback converter, the synchronous switching-on control of the subway brake feedback converter specifically comprises the following steps:
1. detecting whether a starting signal of the feedback converter is received, and if the starting signal of the feedback converter is received, performing the following synchronous closing control step;
in practical application, when the sampling voltage of the dc link system reaches or exceeds the brake feedback start threshold, the system will send a start signal of the feedback converter, and the brake feedback start threshold can be specifically set according to actual needs, which is set to 1500V in this embodiment.
2. After receiving the starting signal of the feedback converter, detecting whether the voltage of the direct current contact network is between 1500V and 1800V (of course, the interval can be set according to actual needs), and if the voltage is within the voltage interval, performing the following operations.
3. When the direct current contact network is normally powered and the feedback converter has a starting command, the feedback converter enters a starting process, the circuit breaker on the alternating current side completes closing, and the direct current side voltage of the feedback converter is a natural rectification voltage value at the moment.
4. Sampling and detecting the voltage of a direct current contact network and the voltage of the direct current side of the feedback converter, and if the difference value between the voltage of the direct current contact network and the voltage of the direct current side of the feedback converter is less than 10V (certainly, the voltage value can be set according to actual needs), directly entering the closing operation of a direct current contactor, completing the synchronous closing of the direct current contactor, and completing the starting operation of the feedback converter;
if the difference between the direct current contact network voltage and the direct current side voltage of the feedback converter is greater than or equal to 10V (certainly, the voltage value can be set according to actual needs), the feedback converter is controlled to perform direct current synchronous voltage stabilizing operation on the direct current side voltage of the feedback converter, so that the difference between the direct current contact network voltage and the direct current side voltage of the feedback converter is smaller than 5V (certainly, the voltage value can be set according to actual needs), then the direct current contactor is switched on, synchronous switching on of the direct current contactor is completed, and starting operation of the feedback converter is completed.
The method for controlling the feedback converter to carry out direct-current synchronous voltage stabilization operation on the direct-current side voltage of the feedback converter comprises the following steps:
1) setting a DC synchronous voltage stabilization control starting flag bit;
2) setting the direct current input voltage value as a voltage stabilization instruction value;
3) controlling the feedback converter to adjust the direct-current side voltage of the feedback converter, wherein the difference value between the adjusted direct-current side voltage of the feedback converter and the direct-current contact network voltage is less than 5V (of course, the voltage value can be set according to actual needs);
4) and blocking the pulse, and setting a flag bit for finishing DC synchronous voltage stabilization control.
Fig. 3 is a schematic diagram of the feedback converter adjusting the dc-side voltage of the feedback converter according to the embodiment of the present invention, which specifically includes:
1. collecting the voltage (Udc _ fdb) of the direct current side of the feedback converter, the three-phase current (ia, ib, ic) of the alternating current side of the feedback converter and the three-phase voltage (e) of the alternating current grida、eb、ec)；
2. Using three-phase voltage (e) of the AC networka、eb、ec) Generating a phase locking angle (theta) through PLL soft phase locking, and generating a d-axis actual current (Id _ fdb) and a q-axis actual current (Iq _ fdb) through abc/dq conversion by using three-phase currents (ia, ib and ic) on the alternating current side of the feedback converter and the phase locking angle (theta);
3. the method comprises the steps that a feedback converter direct current side reference voltage (Udc _ ref) and a feedback converter direct current side voltage (Udc _ fdb) are subjected to difference and PI regulation, and then a d-axis reference current (Id _ ref) and a q-axis reference current (Iq _ ref) are output;
4. the d-axis reference current (Id _ ref) and the d-axis actual current (Id _ fdb) are subjected to difference and PI regulation and then input into a dqo/αβ converter, the q-axis reference current (Iq _ ref) and the q-axis actual current (Iq _ fdb) are subjected to difference and PI regulation and then input into a dqo/αβ converter, and the dqo/αβ converter is combined with a phase locking angle (theta) to generate an SVPWM signal;
5. and controlling the direct current side voltage (Udc _ fdb) of the feedback converter to approach the direct current side reference voltage (Udc _ ref) of the feedback converter through the SVPWM signal.
According to the embodiment, on the premise that the hardware of the conventional subway braking energy feedback system is not changed, the direct-current contactor is ensured to be switched on without impact only through a software control algorithm, so that a direct-current soft start circuit is replaced, the hardware cost of a main loop is reduced, and the size of the device is reduced.
In this embodiment, the dc side of the feedback converter is electrically connected to a dc contact system through a dc contactor, and the ac side of the feedback converter is electrically connected to an ac grid through a circuit breaker, and these connections are conventional connections in the art, and may be modified according to actual needs, and these connections should fall within the protection scope of the present invention.
The specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention is to provide the basic solution described above, and variations, modifications, replacements, and variations of the embodiments can be made without departing from the principle and spirit of the present invention, and still fall within the protection scope of the present invention.
Claims (5)
1. A synchronous switching-on control method of a subway brake feedback converter is characterized by comprising the following steps:
detecting whether a starting signal of the feedback current transformer is received, and if the starting signal of the feedback current transformer is received, performing the following steps;
secondly, controlling the AC side of the feedback converter to be switched on;
if the difference value between the direct-current contact network voltage and the direct-current side voltage of the feedback converter is smaller than a first set threshold value, directly entering the direct-current side switching-on operation of the feedback converter, completing synchronous switching-on of the direct-current side of the feedback converter, and completing the starting operation of the feedback converter; and if the difference between the direct current contact network voltage and the direct current side voltage of the feedback converter is larger than or equal to a first set threshold, controlling the feedback converter to perform direct current synchronous voltage stabilization operation on the direct current side voltage of the feedback converter, enabling the difference between the direct current contact network voltage and the direct current side voltage of the feedback converter to be smaller than a second set threshold, then entering the direct current side switching-on operation of the feedback converter, completing synchronous switching-on of the direct current side of the feedback converter, and completing the starting operation of the feedback converter.
2. The method for controlling the synchronous closing of the subway brake feedback converter according to claim 1, wherein after the step (one), it is detected whether the voltage of the dc link system is within a set threshold range of the normal feedback voltage of the dc link system, and if the voltage of the dc link system is within the set threshold range of the normal feedback voltage of the dc link system, the step (two) and the step (three) are performed.
3. The method for controlling the synchronous closing of the subway brake feedback converter as claimed in claim 1, wherein when it is detected that the dc contact network voltage is higher than the third set threshold, a start signal of the feedback converter is issued.
4. The method for controlling the synchronous closing of the subway brake feedback converter according to claim 2, wherein the set threshold range of the normal feedback voltage of the direct current overhead line system is 1500V to 1800V.
5. The method for controlling the synchronous closing of the subway brake feedback converter as claimed in claim 3, wherein the third threshold is 1500V.
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| CN109774494B (en) * | 2019-02-26 | 2020-12-25 | 中车长春轨道客车股份有限公司 | Control method and system for auxiliary power supply system of high-speed motor train unit and high-speed motor train unit |
| CN110654272B (en) * | 2019-09-30 | 2022-09-16 | 南京亚派科技股份有限公司 | Method for preventing false start between adjacent stations of subway energy feedback device |
| CN111509771A (en) * | 2020-04-21 | 2020-08-07 | 西安许继电力电子技术有限公司 | Self-adaptive feedback control method and device for subway regenerative braking energy feedback device |
| CN117955077B (en) * | 2024-03-27 | 2024-06-25 | 盾石磁能科技有限责任公司 | Charging and discharging control method, device and equipment of flywheel energy storage system |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103296696A (en) * | 2013-06-03 | 2013-09-11 | 深圳市永联科技有限公司 | Inverter and method for controlling same |
| KR20140029047A (en) * | 2012-08-31 | 2014-03-10 | 한국전력공사 | Apparatus for suppressing overvoltage in single point bounded section of underground transmission system |
| CN104333038A (en) * | 2014-11-05 | 2015-02-04 | 株洲时代装备技术有限责任公司 | Method and device for recovering mixed regenerative energy of urban railway power supply system |
| CN204290776U (en) * | 2014-12-11 | 2015-04-22 | 许继电气股份有限公司 | A kind of subway regenerative braking feedback current transformer |
| CN105226969A (en) * | 2015-10-28 | 2016-01-06 | 株洲时代装备技术有限责任公司 | Pressure energy feedback system and can method be presented in power supply of city railway system twin coil access type |
| CN105576697A (en) * | 2015-12-30 | 2016-05-11 | 阳光电源股份有限公司 | Grid-connected control method and device based on virtual synchronous machine |
| CN106159899A (en) * | 2016-07-14 | 2016-11-23 | 南京亚派科技股份有限公司 | The sensor fault monitoring and protecting device and method of subway energy back feed device |
| CN108365628A (en) * | 2018-03-12 | 2018-08-03 | 江苏固德威电源科技股份有限公司 | Three-phase photovoltaic grid-connected inverting device non-impact current grid-connected control method |
| CN108631347A (en) * | 2018-05-02 | 2018-10-09 | 欣旺达电子股份有限公司 | The soft-start method and device of energy feedback type charging/discharging apparatus |
-
2018
- 2018-10-12 CN CN201811189290.3A patent/CN109217376B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140029047A (en) * | 2012-08-31 | 2014-03-10 | 한국전력공사 | Apparatus for suppressing overvoltage in single point bounded section of underground transmission system |
| CN103296696A (en) * | 2013-06-03 | 2013-09-11 | 深圳市永联科技有限公司 | Inverter and method for controlling same |
| CN104333038A (en) * | 2014-11-05 | 2015-02-04 | 株洲时代装备技术有限责任公司 | Method and device for recovering mixed regenerative energy of urban railway power supply system |
| CN204290776U (en) * | 2014-12-11 | 2015-04-22 | 许继电气股份有限公司 | A kind of subway regenerative braking feedback current transformer |
| CN105226969A (en) * | 2015-10-28 | 2016-01-06 | 株洲时代装备技术有限责任公司 | Pressure energy feedback system and can method be presented in power supply of city railway system twin coil access type |
| CN105576697A (en) * | 2015-12-30 | 2016-05-11 | 阳光电源股份有限公司 | Grid-connected control method and device based on virtual synchronous machine |
| CN106159899A (en) * | 2016-07-14 | 2016-11-23 | 南京亚派科技股份有限公司 | The sensor fault monitoring and protecting device and method of subway energy back feed device |
| CN108365628A (en) * | 2018-03-12 | 2018-08-03 | 江苏固德威电源科技股份有限公司 | Three-phase photovoltaic grid-connected inverting device non-impact current grid-connected control method |
| CN108631347A (en) * | 2018-05-02 | 2018-10-09 | 欣旺达电子股份有限公司 | The soft-start method and device of energy feedback type charging/discharging apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 城市轨道交通再生制动能量回馈系统仿真研究;黄开;《中国优秀硕士学位论文全文数据库 工程科技II辑》;20170215(第02期);第C033-324页 * |
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