CN111313431B - Subway traction power supply system and reactive compensation control method and device thereof - Google Patents
Subway traction power supply system and reactive compensation control method and device thereof Download PDFInfo
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- CN111313431B CN111313431B CN201811511290.0A CN201811511290A CN111313431B CN 111313431 B CN111313431 B CN 111313431B CN 201811511290 A CN201811511290 A CN 201811511290A CN 111313431 B CN111313431 B CN 111313431B
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- direct current
- bidirectional converter
- voltage value
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention relates to a subway traction power supply system and a reactive compensation control method and device thereof, which are suitable for the field of subway regenerative braking energy feedback, wherein the reactive compensation control method of the subway traction power supply system comprises the following steps: when the bidirectional converter between the traction substation alternating current bus and the direct current contact network is in a reactive compensation mode, if the direct current contact network is disconnected from the bidirectional converter, the direct current voltage value at the direct current side of the bidirectional converter is controlled to be the direct current contact network no-load voltage value. According to the invention, when the direct current contact net is disconnected with the bidirectional converter, the direct current voltage value at the direct current side of the bidirectional converter is controlled to be the direct current contact net no-load voltage value, the bidirectional converter is prevented from stopping due to direct current under-voltage faults, and reactive compensation of the subway traction power supply system is realized after the direct current contact net is disconnected with the bidirectional converter.
Description
Technical Field
The invention relates to a subway traction power supply system and a reactive compensation control method and device thereof, which are suitable for the field of subway regenerative braking energy feedback.
Background
Urban rail transit development is rapid, and low-carbon environment-friendly and green energy sources become development subjects. The bidirectional converter for subway traction power supply feeds back excess energy generated during the regenerative braking of the subway locomotive to the alternating current power grid in an inversion grid-connected mode, plays the advantages of the regenerative braking of the subway, has the outstanding advantages of low carbon, energy conservation, environmental protection, stability, reliability and low investment, and is the development direction of the energy absorption of the regenerative braking of the subway in the future.
The subway traction power supply bidirectional converter belongs to a three-phase voltage type PWM rectifier and has four-quadrant operation capability, so that the subway traction power supply bidirectional converter not only can provide traction energy for a subway locomotive, but also can invert the braking energy of the subway locomotive to an alternating current power grid, and can also perform reactive compensation on the alternating current power grid of a traction substation according to the requirement. When the device is subjected to reactive compensation, operation continuity is required to be ensured, but after the subway is shut down at night, the overhead line is required to be powered off for maintenance, a direct current breaker (1500V breaker) between the bidirectional converter and the overhead line in fig. 1 is required to be disconnected, after the disconnection, the bidirectional converter loses the voltage support of the overhead line, a direct current under-voltage fault occurs, and then the fault is stopped, so that reactive compensation operation is interrupted.
Disclosure of Invention
The invention aims to provide a subway traction power supply system and a reactive compensation control method and device thereof, which are used for solving the problem that the reactive compensation operation is interrupted due to direct current under-voltage faults caused by the fact that a bidirectional converter loses the voltage support of a catenary after the catenary is powered off.
In order to achieve the above purpose, the invention provides a subway traction power supply system and a reactive compensation control method and device thereof.
A reactive compensation control method of a subway traction power supply system comprises the following steps:
when the bidirectional converter between the traction substation alternating current bus and the direct current contact network is in a reactive compensation mode, if the direct current contact network is disconnected from the bidirectional converter, the direct current voltage value at the direct current side of the bidirectional converter is controlled to be the direct current contact network no-load voltage value.
When the direct current contact net is disconnected with the bidirectional converter, the direct current voltage value at the direct current side of the bidirectional converter is controlled to be the direct current contact net no-load voltage value, the bidirectional converter is prevented from stopping due to direct current under-voltage faults, reactive compensation after the disconnection between the direct current contact net and the bidirectional converter is realized, the bidirectional converter is free from stopping in the whole process, the continuity of reactive compensation is ensured, and the power factor of a traction substation and the utilization rate of the bidirectional converter are improved without hardware modification by adopting the method, so that the cost is further saved.
Further, the reactive compensation control method of the subway traction power supply system further comprises the following steps: and if the direct current contact network starts to transmit power, controlling the direct current voltage value of the direct current side of the bidirectional converter to change into the running voltage value of the direct current contact network before the bidirectional converter and the direct current contact network are reconnected.
Before the bidirectional converter is reconnected with the direct current contact network, the direct current voltage value on the direct current side of the bidirectional converter is controlled to be changed into the running voltage value of the direct current contact network, so that the impact of the direct current contactor in closing can be reduced, the normal running of the reactive compensation process after the contact network transmits power is ensured, the stability of the bidirectional converter is ensured, and the safety of power supply is improved.
The reactive compensation control device of the subway traction power supply system comprises a memory and a processor, wherein the processor is used for executing instructions stored in the memory to realize the following method:
when the bidirectional converter between the traction substation alternating current bus and the direct current contact network is in a reactive compensation mode, if the direct current contact network is disconnected from the bidirectional converter, the direct current voltage value at the direct current side of the bidirectional converter is controlled to be the direct current contact network no-load voltage value.
When the direct current contact net is disconnected with the bidirectional converter, the direct current voltage value at the direct current side of the bidirectional converter is controlled to be the direct current contact net no-load voltage value, the bidirectional converter is prevented from stopping due to direct current under-voltage faults, reactive compensation after the disconnection between the direct current contact net and the bidirectional converter is realized, the bidirectional converter is free from stopping in the whole process, the continuity of reactive compensation is ensured, and the power factor of a traction substation and the utilization rate of the bidirectional converter are improved without hardware modification by adopting the device, so that the cost is further saved.
Further, the reactive compensation control device of the subway traction power supply system further realizes the following method: and if the direct current contact network starts to transmit power, controlling the direct current voltage value of the direct current side of the bidirectional converter to change into the running voltage value of the direct current contact network before the bidirectional converter and the direct current contact network are reconnected.
Before the bidirectional converter is reconnected with the direct current contact network, the direct current voltage value on the direct current side of the bidirectional converter is controlled to be changed into the running voltage value of the direct current contact network, so that the impact of the direct current contactor in closing can be reduced, the normal running of the reactive compensation process after the contact network transmits power is ensured, the stability of the bidirectional converter is ensured, and the safety of power supply is improved.
The subway traction power supply system comprises a bidirectional converter arranged between an alternating current bus of a traction substation and a direct current contact net, and further comprises a control device, wherein the control process realized by the control device comprises the following steps:
when the bidirectional converter between the traction substation alternating current bus and the direct current contact network is in a reactive compensation mode, if the direct current contact network is disconnected from the bidirectional converter, the direct current voltage value at the direct current side of the bidirectional converter is controlled to be the direct current contact network no-load voltage value.
When the direct current contact net is disconnected with the bidirectional converter, the direct current voltage value at the direct current side of the bidirectional converter is controlled to be the direct current contact net no-load voltage value, the bidirectional converter is prevented from stopping due to direct current under-voltage faults, reactive compensation after the disconnection between the direct current contact net and the bidirectional converter is realized, the bidirectional converter is free from stopping in the whole process, the continuity of reactive compensation is ensured, and the system is adopted to improve the power factor of a traction substation and the utilization rate of the bidirectional converter without hardware change, so that the cost is further saved.
Further, a direct current contactor and a direct current breaker are arranged in series between the bidirectional converter and the direct current contact net, the direct current contactor is connected with the bidirectional converter, and the direct current breaker is connected with the direct current contact net.
The direct current contactor and the direct current breaker can ensure the normal operation of the system.
Further, before the direct current voltage value of the direct current side of the bidirectional converter is controlled to be the no-load voltage value of the direct current contact net, the disconnection between the direct current contact net and the bidirectional converter is specifically as follows: and the direct current breaker is monitored to be changed from a closing state to a separating state.
When the state of the direct current breaker is a switching-off state, the disconnection between the direct current contact net and the bidirectional converter is indicated.
Further, before the direct current voltage value of the direct current side of the bidirectional converter is controlled to be the no-load voltage value of the direct current contact net and after the direct current contact net is disconnected with the bidirectional converter, the direct current contactor is controlled to execute the opening operation.
The switching-off of the direct current contactor is carried out after the direct current contact net is disconnected with the bidirectional converter, so that the switching-off impact of the direct current contactor can be avoided.
Further, the control process implemented by the control device further includes: and when the direct current breaker is monitored to be changed into a closing state from a separating state, the direct current contact network starts to transmit power, and the direct current voltage value on the direct current side of the bidirectional converter is controlled to be changed into the running voltage value of the direct current contact network.
When the direct current breaker is monitored to be changed into a switching-on state from a switching-off state and the direct current contact network starts to transmit power, the bidirectional converter and the direct current contact network are indicated to be ready to be reconnected, and before the bidirectional converter and the direct current contact network are reconnected, the direct current voltage value on the direct current side of the bidirectional converter is controlled to be changed into the running voltage value of the direct current contact network, so that the impact of the direct current contactor in switching-on can be reduced, the normal operation of the reactive power compensation process after the contact network transmits power is ensured, the stability of the bidirectional converter is also ensured, and the power supply safety is improved.
Further, after the direct current voltage value of the direct current side of the bidirectional converter is controlled to be changed into the running voltage value of the direct current contact net, the method further comprises the following steps: and controlling the direct current contactor to execute switching-on operation.
The process realizes the communication between the bidirectional converter and the contact net, avoids closing impact, and further ensures the continuity of reactive compensation.
Drawings
FIG. 1 is a schematic diagram of a subway traction power supply system of the present invention;
FIG. 2 is a logic diagram of a night reactive compensation control strategy of the bidirectional converter;
fig. 3 is a flow chart of the night reactive compensation control strategy of the bidirectional converter.
Detailed Description
Subway traction power supply system embodiment:
as shown in fig. 1, the subway traction power supply system (hereinafter referred to as a power supply system) includes a bidirectional converter and a control device (not shown in the figure), the bidirectional converter is disposed between an ac bus of a traction substation and a dc contact network, and a dc contactor and a dc breaker (1500V breaker) are sequentially disposed between the bidirectional converter and the dc contact network. The control device is a reactive compensation control device (hereinafter referred to as control device) of a subway traction power supply system, and comprises a memory and a processor, wherein the processor is used for executing instructions stored in the memory to realize the following method:
1) When the bidirectional converter between the traction substation alternating current bus and the direct current contact network is in the reactive compensation mode, if the direct current contact network is disconnected with the bidirectional converter, the bidirectional converter enters the reactive compensation mode at night in order to ensure the normal operation of the reactive compensation process.
The disconnection between the direct current contact network and the bidirectional converter is specifically shown as the disconnection of a direct current breaker, and the disconnection and the connection operation of the direct current breaker are required to be operated by subway operators. After the opening condition of the direct current contactor is met, the direct current contactor is opened so as to avoid the opening impact.
2) And after the bidirectional converter enters the night reactive compensation mode, controlling the direct-current voltage value of the direct-current side of the bidirectional converter to be the direct-current contact net no-load voltage value, and stabilizing the direct-current contact net no-load voltage value to continuously output reactive power. In this embodiment, the no-load voltage value of the dc contact net is 1650V, and of course, the dc voltage value of the dc side of the bidirectional converter controlled in this process is related to the no-load voltage value of the dc contact net, and may be set as required. In addition, in the night reactive compensation mode, the voltage of the dc catenary needs to be continuously monitored.
3) If it is monitored that the dc breaker is changed from the open state to the closed state, and the voltage of the dc contact net is recovered to the operating voltage value or above (1500V here), it is indicated that the dc contact net starts transmitting power, at this time, the bidirectional converter needs to exit the reactive compensation mode at night, and the process of exiting the reactive compensation mode at night is as follows: controlling the direct current voltage value of the direct current side of the bidirectional converter to change into the running voltage value of the direct current contact net; when the direct current voltage value of the direct current side of the bidirectional converter is the same as and stable with the running voltage value of the direct current contact net, the direct current contactor is controlled to be switched on, and at the moment, the bidirectional converter does not control the direct current voltage value of the bidirectional converter any more, and reactive compensation running is continued. The step can further ensure the continuous operation of the reactive compensation process after the direct current contact network starts to transmit power.
After the switching-on state of the direct current breaker is monitored by the bidirectional converter through manual operation of switching-on of the direct current breaker, the direct current voltage of the bidirectional converter is adjusted to be the running voltage of the contact network, and then the switching-on of the direct current contactor is controlled, so that the impact can be reduced. If the direct current contactor is closed first, the bidirectional converter cannot monitor the voltage of the direct current contact network (the sampling device of the contact network voltage is positioned between the direct current contactor and the direct current breaker) because the direct current breaker is not closed, so that whether the voltages at two ends of the direct current breaker are the same cannot be ensured, and if the direct current breaker is directly closed, closing impact can be generated.
In this embodiment, the control device, the dc contactor and the bidirectional converter are separate devices, and of course, the control device and the dc contactor may also be disposed inside the bidirectional converter, so that the dc contactor belongs to a part of the bidirectional converter, and the switching on and off of the dc contactor may be controlled by the controller.
In conclusion, the continuous operation of reactive compensation of the subway traction power supply system is realized, and the power factor of the power grid of the substation and the utilization rate of the bidirectional converter are improved.
In order to ensure the normal operation of the subway traction power supply system, a traction transformer is arranged between the traction substation alternating current bus and the bidirectional converter, and other branches are also arranged between the traction substation alternating current bus and the contact net, for example, in fig. 1, the other branches are formed by the traction transformer of the substation and the traction rectifier of the substation, and the specific working process is irrelevant to the invention and is not described here.
Reactive compensation control method embodiment of subway traction power supply system:
the reactive compensation control method of the subway traction power supply system comprises the following steps:
when the bidirectional converter between the traction substation alternating current bus and the direct current contact network is in a reactive compensation mode, if the direct current contact network is disconnected from the bidirectional converter, the direct current voltage value at the direct current side of the bidirectional converter is controlled to be the direct current contact network no-load voltage value.
The specific implementation process of the reactive compensation control method of the subway traction power supply system is described in detail in the embodiment of the subway traction power supply system, and will not be described in detail here.
An embodiment of a reactive compensation control device of a subway traction power supply system is as follows:
the structural components and the working process of the reactive compensation control device of the subway traction power supply system are described in detail in the embodiment of the subway traction power supply system, and are not described in detail herein.
Claims (8)
1. The reactive compensation control method for the subway traction power supply system is characterized by comprising the following steps of:
when the bidirectional converter between the traction substation alternating current bus and the direct current contact network is in the reactive compensation mode, if the direct current contact network is disconnected from the bidirectional converter, entering the reactive compensation mode at night: controlling the direct-current voltage value of the direct-current side of the bidirectional converter to be the no-load voltage value of the direct-current contact net so as to continuously output reactive power and continuously monitor the voltage of the direct-current contact net;
if the direct current contact net is monitored to start transmitting power, the night reactive power compensation mode is exited: controlling the direct current voltage value of the direct current side of the bidirectional converter to change into the running voltage value of the direct current contact net; when the DC voltage value of the DC side of the bidirectional converter is the same as and stable with the running voltage value of the DC contact net, the bidirectional converter is controlled to be reconnected with the DC contact net, and the bidirectional converter does not control the DC voltage value and continues reactive compensation running.
2. The reactive compensation control device of the subway traction power supply system is characterized by comprising a memory and a processor, wherein the processor is used for executing instructions stored in the memory to realize the following method:
when the bidirectional converter between the traction substation alternating current bus and the direct current contact network is in the reactive compensation mode, if the direct current contact network is disconnected from the bidirectional converter, entering the reactive compensation mode at night: controlling the direct-current voltage value of the direct-current side of the bidirectional converter to be the no-load voltage value of the direct-current contact net so as to continuously output reactive power and continuously monitor the voltage of the direct-current contact net;
if the direct current contact net is monitored to start transmitting power, the night reactive power compensation mode is exited: controlling the direct current voltage value of the direct current side of the bidirectional converter to change into the running voltage value of the direct current contact net; when the DC voltage value of the DC side of the bidirectional converter is the same as and stable with the running voltage value of the DC contact net, the bidirectional converter is controlled to be reconnected with the DC contact net, and the bidirectional converter does not control the DC voltage value and continues reactive compensation running.
3. The utility model provides a subway traction power supply system, includes the bidirectional converter who sets up between traction substation alternating current busbar and direct current contact net, its characterized in that still includes controlling means, the control process that controlling means realized includes:
when the bidirectional converter between the traction substation alternating current bus and the direct current contact network is in the reactive compensation mode, if the direct current contact network is disconnected from the bidirectional converter, entering the reactive compensation mode at night: controlling the direct-current voltage value of the direct-current side of the bidirectional converter to be the no-load voltage value of the direct-current contact net so as to continuously output reactive power and continuously monitor the voltage of the direct-current contact net;
if the direct current contact net is monitored to start transmitting power, the night reactive power compensation mode is exited: controlling the direct current voltage value of the direct current side of the bidirectional converter to change into the running voltage value of the direct current contact net; when the DC voltage value of the DC side of the bidirectional converter is the same as and stable with the running voltage value of the DC contact net, the bidirectional converter is controlled to be reconnected with the DC contact net, and the bidirectional converter does not control the DC voltage value and continues reactive compensation running.
4. A subway traction power supply system according to claim 3, wherein a direct current contactor and a direct current breaker are connected in series between the bidirectional converter and the direct current contact network, the direct current contactor being connected with the bidirectional converter, and the direct current breaker being connected with the direct current contact network.
5. The subway traction power supply system according to claim 4, wherein before the direct current voltage value of the direct current side of the bidirectional converter is controlled to be the no-load voltage value of the direct current contact network, the disconnection between the direct current contact network and the bidirectional converter is specifically: and the direct current breaker is monitored to be changed from a closing state to a separating state.
6. The subway traction power supply system according to claim 4 or 5, wherein the dc contactor is controlled to perform the opening operation before the dc voltage value on the dc side of the bidirectional converter is the no-load voltage value of the dc catenary and after the dc catenary is disconnected from the bidirectional converter.
7. The subway traction power supply system according to claim 4, wherein the control process implemented by the control device further includes: and when the direct current breaker is monitored to be changed into a closing state from a separating state, the direct current contact network starts to transmit power, and the direct current voltage value on the direct current side of the bidirectional converter is controlled to be changed into the running voltage value of the direct current contact network.
8. The subway traction power supply system according to claim 7, wherein after the direct current voltage value on the direct current side of the bidirectional converter is controlled to be changed into the operation voltage value of the direct current catenary, further comprising: and controlling the direct current contactor to execute switching-on operation.
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