CN110649565A - Protection method of regenerative braking energy feedback system of high-speed rail - Google Patents

Protection method of regenerative braking energy feedback system of high-speed rail Download PDF

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Publication number
CN110649565A
CN110649565A CN201911009733.0A CN201911009733A CN110649565A CN 110649565 A CN110649565 A CN 110649565A CN 201911009733 A CN201911009733 A CN 201911009733A CN 110649565 A CN110649565 A CN 110649565A
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fault
voltage
disconnected
current
switch cabinet
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CN110649565B (en
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胡海涛
黄文龙
陈俊宇
耿安琪
何正友
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Southwest Jiaotong University
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Southwest Jiaotong University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/10—Dynamic electric regenerative braking
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • H02H3/042—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned combined with means for locating the fault
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/06—Details with automatic reconnection
    • H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

Abstract

The invention discloses a protection method of a regenerative braking energy feedback system of a high-speed rail, which comprises the following steps: detecting a system key position real-time signal; the control module judges the position and the type of the fault; and carrying out tripping, reclosing and combined tripping protection actions according to the fault type. The invention has the beneficial effects that: (1) the detection sensor is arranged at the key position of the high-speed railway regenerative braking energy feedback system, and the protection of the high-speed railway regenerative braking energy feedback system is completed through detection, judgment and action, so that the vacancy of the system protection method is filled. (2) The fault detection and protection combined tripping logic can timely and accurately process different types of faults generated by the high-speed rail regenerative braking energy feedback system under different operation conditions, so that the self-protection of the substation fault feedback equipment is realized, and the function of power supply of the substation is not influenced by the fault of the feedback equipment. (3) By detecting the running state of the railway 10kV power supply system, the island state can be identified in time, and the grid-connected inverter is prevented from running in an island manner.

Description

Protection method of regenerative braking energy feedback system of high-speed rail
Technical Field
The invention relates to the field of traction power supply systems, in particular to a protection method of a regenerative braking energy feedback system of a high-speed rail.
Background
The high-speed railway regenerative braking energy feedback system can feed the regenerative braking energy generated by the high-speed railway train in the braking process back to the railway 10kV power grid, can detect the 10kV load power and match the feedback power, realizes the recycling of the regenerative energy and improves the economic benefit. However, faults such as overcurrent and overvoltage may occur in the operation process of the feedback system, which may cause the feedback device to fail if the fault is light, and may affect the normal operation of the traction power supply system and the railway 10kV power supply system if the fault is heavy.
At present, no protection system designed for a regenerative braking energy feedback system of a high-speed railway exists, and the problem of fault protection of the system cannot be solved.
Disclosure of Invention
The invention aims to provide a protection method of a regenerative braking energy feedback system of a high-speed rail, which realizes the functions that the power supply of a traction power supply system is not influenced by equipment faults and the self protection of the fault equipment of the traction power supply system is realized.
The technical scheme for realizing the purpose of the invention is as follows:
a protection method for a regenerative braking energy feedback system of a high-speed rail comprises
Step 1: collecting real-time signals, comprising: single-phase alternating current voltage and current at a feeder line outlet of the traction transformer T; left side multi-winding step-down transformer T1And a right-side multi-winding step-down transformer T2Primary side port of (3) single-phase alternating voltage, current, T1And T2Secondary side end ofSingle phase AC voltage, current, T1And T2Oil level height, temperature; left-side multiple four-quadrant converter B1Each single group of four-quadrant converters B1iThe AC side port of (A) is connected with a single-phase AC voltage, current, each B1iDirect side direct voltage of (B) each1iThe IGBT element terminal voltage of (1); right-side multiple four-quadrant converter B2Each single group of four-quadrant converters B2iThe AC side port of (A) is connected with a single-phase AC voltage, current, each B2iDirect side direct voltage of (B) each2iThe IGBT element terminal voltage of (1); b is1And B2Direct current side anode direct current bus D1And a negative DC bus D2A direct current voltage; the output end of the three-phase inverter N is used for outputting three-phase alternating current voltage and current; the IGBT element terminal voltage of N; grid-connected step-up transformer T3Primary side port and secondary side port of the three-phase AC voltage, current, T3Oil level, temperature, T3The grid-connected point three-phase alternating-current voltage; three-phase alternating current voltage and current at the incoming line end of a railway 10kV power grid G;
step 2: setting the protection priority as: 1) t and G; 2) t is1、T2N and T3；3)B1And B2；
If different equipment simultaneously generates faults, sequentially performing protection actions according to the priority order;
determining the running state of the system according to the real-time signal, carrying out-of-limit judgment, and outputting a tripping or warning signal according to the protection logic;
and step 3: setting the reclosing priority as follows: 1) t and T1Switch cabinet K connected with each other1T and T2Switch cabinet K connected with each other2G and T3Switch cabinet K connected with each other7；2)T1And B1Switch cabinet K connected with each other3，T2And B2Switch cabinet K connected with each other4，D1And D2And N connected switch cabinet K5N and T3Switch cabinet K connected with each other6；3)B1Each single group of four-quadrant converters B1iA switch cabinet connected therebetween, B2Each single group of four-quadrant converters B2iA switch cabinet connected with the switch cabinet;
after the tripping action occurs, delaying and then carrying out primary reclosing, and if the reclosing is successful, restoring the normal operation of the system; wherein, B1And B2The input mode is step-by-step input; if the switching-on fails, judging the permanent fault and sending a secondary alarm;
in said step 2, the protection logic comprises
A traction transformer T: generating a trip signal to control K under the fault-tolerant operation state1And K2Is disconnected and simultaneously linked to trip K7Controlling the high-voltage circuit breaker to be disconnected;
left side multi-winding step-down transformer T1And a right-side multi-winding step-down transformer T2: generating a trip signal to control K under the fault-tolerant operation state1And K2Is disconnected and simultaneously linked to trip K7Controlling the high-voltage circuit breaker to be disconnected; generating corresponding alarm signals under fault-tolerant operation fault states;
left-side multiple four-quadrant converter B1And a right-side multiple four-quadrant converter B2: generating a trip signal to control K under the fault-tolerant operation state3、K4And K5Is opened and simultaneously linked to trip K1、K2And K7Controlling the high-voltage circuit breaker to be disconnected; generating corresponding alarm signals under fault-tolerant operation fault states;
three-phase inverter N: generating a trip signal to control K under the fault-tolerant operation state5And K6Is opened and simultaneously linked to trip K3、K4And K7Controlling the high-voltage circuit breaker to be disconnected and quitting the whole feedback device; generating corresponding alarm signals under fault-tolerant operation fault states;
grid-connected step-up transformer T3: generating a trip signal to control K under the fault-tolerant operation state7Is disconnected and simultaneously linked to trip K1And K2Controlling high voltage circuit breakThe device is disconnected; generating corresponding alarm signals under fault-tolerant operation fault states;
railway 10kV electric network G: generating a trip signal to control K under the fault-tolerant operation state7Is disconnected and simultaneously linked to trip K1And K2Controlling the high-voltage circuit breaker to be disconnected; generating a trip signal under the N isolated island operation state of the three-phase inverter to control K7Is disconnected and simultaneously linked to trip K1And K2And controlling the high-voltage circuit breaker to be disconnected.
Compared with the prior art, the invention has the beneficial effects that:
(1) the detection sensor is arranged at the key position of the high-speed railway regenerative braking energy feedback system, and the protection of the high-speed railway regenerative braking energy feedback system is completed through detection, judgment and action, so that the vacancy of the system protection method is filled.
(2) The fault detection and protection combined tripping logic can timely and accurately process different types of faults generated by the high-speed rail regenerative braking energy feedback system under different operation conditions, so that the self-protection of the substation fault feedback equipment is realized, and the function of power supply of the substation is not influenced by the fault of the feedback equipment.
(3) By detecting the running state of the railway 10kV power supply system, the island state can be identified in time, and the grid-connected inverter is prevented from running in an island manner.
Drawings
Fig. 1 is a schematic view of a topology structure of a protection system of a regenerative energy feedback system of a high-speed railway.
Fig. 2 is a block diagram of protection mode selection of a high-speed railway regenerative energy feedback system protection system.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
Fig. 1 is a schematic view of an electrical topology structure of a protection system of a high-speed rail regenerative energy feedback system. The system consists of a traction power supply system, a multi-winding step-down transformer, a multiple four-quadrant converter, a three-phase inverter, a grid-connected step-up transformer, a railway 10kV power supply system, sensors and a switch cabinet. The system has the main functions as follows:
1) feeding back regenerative braking energy generated by regenerative braking of the high-speed rail train to a railway 10kV power supply system;
2) transferring the load from the bridge arm with high power to the bridge arm with low power, realizing load balance of the two power supply arms, and treating negative sequence current;
3) and carrying out reactive compensation and harmonic suppression.
The control method of the high-speed railway regenerative energy feedback system protection system comprises the following steps:
step 1: collecting real-time signals of a sensor, comprising: single-phase alternating voltage and current at feeder outlet of traction transformer (T), and left multi-winding step-down transformer (T)1) Single-phase AC voltage, current of primary side port, multi-winding step-down transformer (T) of right side2) Primary side port single phase ac voltage, current, left side multi-winding step down transformer (T)1) Single-phase AC voltage, current of secondary side port, multi-winding step-down transformer (T) on right side2) Secondary side port single phase ac voltage, current, left side multiple winding step down transformer (T)1) Oil level height, temperature, right side multi-winding step down transformer (T)2) Oil level height, temperature, left and right side multiple four-quadrant converter (B)1、B2) Single-phase AC voltage and current at AC side port, single-group four-quadrant converter (B) at left and right sides1i、B2i) Single-phase AC voltage and current at AC side port, single-group four-quadrant converter (B) at left and right sides1i、B2i) DC side DC voltage, left and right side multiple four-quadrant converter (B)1、B2) IGBT component terminal voltage, left and right side multiple four-quadrant converter (B)1、B2) DC side positive DC bus (D)1) And a negative electrode DC bus (D)2) Indirect DC voltage, three-phase AC voltage and current at output end of three-phase inverter (N), voltage at IGBT element end of three-phase inverter (N), and grid-connected step-up transformer (T)3) Primary side port three-phase AC voltage, current, grid-connected step-up transformer (T)3) Secondary side port three-phase AC voltage, current, grid-connected step-up transformer (T)3) The height of the oil level,Temperature, grid-connected step-up transformer (T)3) The three-phase alternating-current voltage of a grid-connected point, and the three-phase alternating-current voltage and current of a railway 10kV power supply system (G) incoming line end.
Step 2: setting the protection priority as: 1) a traction transformer (T) and a railway 10kV power supply system (G); 2) left and right side multi-winding step-down transformer (T)1、T2) Three-phase inverter (N), grid-connected step-up transformer (T)3) (ii) a 3) Left and right side multiple four-quadrant converter (B)1、B2)。
And if different systems or equipment simultaneously generate faults, performing protection action according to the priority sequence.
The detection sensor converts the detection quantity into an electric signal and uploads the electric signal to the control module (all signals are input in parallel), the control module performs analog/digital conversion, calculation and interference elimination on the detection signal, and then the running state of the system is determined and out-of-limit judgment is performed: and if the measured value signals in the detection time limits of the two cycles are out of limit, judging that the system has a fault.
And step 3: setting the reclosing priority as follows: 1) traction transformer (T) and left and right side multi-winding step-down transformer (T)1、T2) Switch cabinet K connected with each other1、K2Railway 10kV power supply system (G) and grid-connected step-up transformer (T)3) Switch cabinet K connected with each other7(ii) a 2) Left and right side multi-winding step-down transformer (T)1、T2) And a left-side and a right-side multiple four-quadrant converter (B)1、B2) Switch cabinet K connected with each other3、K4Left and right side multiple four-quadrant converter (B)1、B2) Switch cabinet K connected with three-phase inverter (N)5Three-phase inverter (N) and grid-connected step-up transformer (T)3) Switch cabinet K connected with each other6(ii) a 3) Left and right side multiple four-quadrant converter (B)1、B2) Among the various multiplexing modules (B)1i、B2i) A connected switch cabinet.
After the tripping action occurs, delaying for 2.0 seconds after the breaker is disconnected to carry out primary reclosing, if the reclosing is successful, the system recovers to normal operation, wherein the left side and the right side are multiplexed into four-quadrant variable currentDevice (B)1、B2) The input mode is from low to high (in B)1、B2And after the switch cabinet of the above grade is disconnected, B1iAnd B2iThe switch cabinet in between is also disconnected; when reclosing, first closing B1iAnd B2iThe switch cabinet connected between them is closed again1、B2A switch cabinet with other equipment). If the switch-on fails, the permanent fault is judged, and the control module sends out a secondary alarm.
The method for protecting the fault of the traction power supply system comprises the following steps:
a. the control module receives the parallel real-time detection quantity and comprises: single-phase alternating current voltage and current at a feeder line outlet of a traction transformer (T);
b. the control module performs analog/digital conversion on the received detection quantity and performs out-of-limit judgment on a digital quantity signal obtained by conversion, and any signal out-of-limit is judged to be a fault-intolerant operation fault;
c. the control module generates a trip signal to control the traction transformer (T) and the left and right multi-winding step-down transformers (T) under the fault-tolerant operation state1、T2) The high-voltage circuit breaker in the intermediate switch cabinet is disconnected, and a railway 10kV power supply system (G) and a grid-connected booster transformer (T) are simultaneously jumped3) The intermediate switch cabinet controls the high-voltage circuit breakers in the corresponding switch cabinet to be switched off, and the self-protection function of the fault equipment of the substation is realized;
d. and (3) delaying for 2.0 seconds after each breaker is disconnected to carry out automatic reclosing, if the reclosing is successful, continuing to operate the system, and if the reclosing is failed, judging that the system has a permanent fault, and sending a secondary alarm by the control module. Left and right side multi-winding step-down transformer (T)1、T2) The protection method comprises the following steps:
a. the control module receives the parallel real-time detection quantity and comprises: left side multiple winding step-down transformer (T)1) Single-phase AC voltage, current of primary side port, multi-winding step-down transformer (T) of right side2) Primary side port single phase ac voltage, current, left side multi-winding step down transformer (T)1) Secondary side port single-phase AC voltage, current, right side multi-phaseWinding step-down transformer (T)2) Secondary side port single phase ac voltage, current, left side multiple winding step down transformer (T)1) Oil level height, temperature, right side multi-winding step down transformer (T)2) Oil level height, temperature;
b. the control module performs analog/digital conversion on the received detection quantity and performs out-of-limit judgment on a digital quantity signal obtained by conversion, wherein the out-of-limit of voltage, current and temperature is judged as a fault-intolerant operation fault, and the out-of-limit of oil level is judged as a fault-tolerant operation fault;
c. the control module generates trip signals to control the left and right side multi-winding step-down transformers (T) in the fault-tolerant operation state1、T2) A step-up transformer (T) connected with the traction transformer (T) and used for connecting the high-voltage circuit breaker in the switch cabinet to be disconnected and simultaneously performing combined tripping and grid connection3) A switch cabinet is connected with a railway 10kV power supply system (G) to control a high-voltage circuit breaker in the corresponding switch cabinet to be disconnected, so that the function that the power supply of a substation is not influenced by equipment failure is realized; the control module generates corresponding alarm signals under fault-tolerant operation fault states.
d. And (3) delaying for 2.0 seconds after each breaker is disconnected to carry out automatic reclosing, if the reclosing is successful, continuing to operate the system, and if the reclosing is failed, judging that the system has a permanent fault, and sending a secondary alarm by the control module.
Left and right side multiple four-quadrant converter (B)1、B2) The protection method comprises the following steps:
a. the control module receives the parallel real-time detection quantity and comprises: left and right side multiple four-quadrant converter (B)1、B2) Single-phase AC voltage and current at AC side port, single-group four-quadrant converter (B) at left and right sides1i、B2i) Single-phase AC voltage and current at AC side port, single-group four-quadrant converter (B) at left and right sides1i、B2i) DC side DC voltage, left and right side multiple four-quadrant converter (B)1、B2) The IGBT element terminal voltage, left and right side multiple four-quadrant converter (B)1、B2) DC side positive DC bus (D)1) And a negative electrode DC bus (D)2) Intermediate DC voltage；
b. The control module carries out analog/digital conversion on the received detection quantity and carries out-of-limit judgment on a digital quantity signal obtained by conversion, wherein the voltage and the current of the alternating current side of the four-quadrant converter are out-of-limit, the voltage and the current of the direct current side of the four-quadrant converter are out-of-limit, the voltage and the current of the IGBT component of the four-quadrant converter are out-of-limit, and the converter cannot work, so that the converter is judged to be a fault-tolerant operation; the voltage of the IGBT component end of the four-quadrant converter exceeds the limit and the converter can work and can be judged to have fault-tolerant operation faults;
c. the control module generates a trip signal to control the left and right sides of the multiple four-quadrant converter (B) under the fault-tolerant operation state1、B2) And left and right side multi-winding step-down transformers (T)1、T2) The switch cabinet, the left side and the right side are connected with a multi-four-quadrant converter (B)1、B2) A low-voltage circuit breaker in a switch cabinet connected with a three-phase inverter (N) is disconnected, and a left-side and right-side multi-winding step-down transformer (T) is simultaneously in combined tripping1、T2) High-voltage circuit breaker in switch cabinet between traction transformer (T) and grid-connected booster transformer (T)3) A high-voltage circuit breaker in a switch cabinet between the railway 10kV power supply system (G); the control module generates corresponding alarm signals under fault-tolerant operation fault states.
d. And (3) delaying for 2.0 seconds after each breaker is disconnected to carry out automatic reclosing, if the reclosing is successful, continuing to operate the system, and if the reclosing is failed, judging that the system has a permanent fault, and sending a secondary alarm by the control module.
Method for protecting a three-phase inverter (N), comprising the steps of:
a. the control module receives the parallel real-time detection quantity and comprises: the output end of the three-phase inverter (N) is provided with three-phase alternating current voltage and current, and the end voltage of an IGBT element of the three-phase inverter (N);
b. the control module carries out analog/digital conversion on the received detection quantity and carries out-of-limit judgment on a digital quantity signal obtained by conversion, wherein the voltage and the current of the alternating current side of the three-phase inverter (N) are out-of-limit, the voltage of the IGBT component end of the three-phase inverter (N) is out-of-limit, and the inverter cannot work, so that the inverter is judged to be fault-tolerant-incapable operation fault; the voltage of the IGBT component end of the three-phase inverter (N) exceeds the limit and the inverter can work and is judged to be fault-tolerant operation fault;
c. the control module generates a trip signal to control the three-phase inverter (N) and the grid-connected step-up transformer (T) in the fault-tolerant operation state3) A switch cabinet, a three-phase inverter (N) and a left-side and right-side multiple four-quadrant converter (B) are connected between1、B2) Low-voltage circuit breaker in direct-current side-to-side switch cabinet is disconnected, and a left-side and right-side multi-winding step-down transformer (T) is in combined tripping at the same time1、T2) High-voltage circuit breaker in switch cabinet between traction transformer (T) and grid-connected booster transformer (T)3) The high-voltage circuit breaker in the switch cabinet between the system and the railway 10kV power supply system (G) quits the whole feedback device (namely the device of the feedback system, which does not comprise a traction power supply system and the railway 10kV power supply system); the control module generates corresponding alarm signals under fault-tolerant operation fault states.
d. And (3) delaying for 2.0 seconds after each breaker is disconnected to carry out automatic reclosing, if the reclosing is successful, continuing to operate the system, and if the reclosing is failed, judging that the system has a permanent fault, and sending a secondary alarm by the control module.
Grid-connected step-up transformer (T)3) The protection method comprises the following steps:
a. the control module receives the parallel real-time detection quantity and comprises: grid-connected step-up transformer (T)3) Primary side port three-phase AC voltage, current, grid-connected step-up transformer (T)3) Secondary side port three-phase AC voltage, current, grid-connected step-up transformer (T)3) Oil level height, temperature;
b. the control module performs analog/digital conversion on the received detection quantity and performs out-of-limit judgment on a digital quantity signal obtained by conversion, wherein the out-of-limit of voltage, current and temperature is judged as a fault-intolerant operation fault, and the out-of-limit of oil level is judged as a fault-tolerant operation fault;
c. the control module generates a trip signal to control the grid-connected step-up transformer (T) in a fault-tolerant operation state3) A multi-winding step-down transformer (T) which is connected with a railway 10kV power supply system (G) and is connected with the left side and the right side of a switch cabinet for disconnecting a high-voltage circuit breaker and is simultaneously jumped1、T2) And tractionThe transformer (T) is connected with a switch cabinet to control the high-voltage circuit breaker in the corresponding switch cabinet to be switched off, so that the function that the power supply of a substation is not influenced by equipment failure is realized; the control module generates corresponding alarm signals under fault-tolerant operation fault states.
d. And (3) delaying for 2.0 seconds after each breaker is disconnected to carry out automatic reclosing, if the reclosing is successful, continuing to operate the system, and if the reclosing is failed, judging that the system has a permanent fault, and sending a secondary alarm by the control module.
The protection method of the railway 10kV power supply system (G) comprises the following steps:
a. the control module receives the parallel real-time detection quantity and comprises: three-phase inverter (N) output terminal voltage, current, grid-connected step-up transformer (T)3) The three-phase alternating-current voltage of a grid-connected point, and the three-phase alternating-current voltage and current of a railway 10kV power supply system (G) incoming line end.
b. The control module performs analog/digital conversion and calculation on the received detection quantity, and performs out-of-limit judgment on the obtained digital quantity signal, wherein the out-of-limit of the terminal voltage, the current and the temperature of the inlet wire of the railway 10kV power grid is judged to be a fault-tolerant operation fault; grid-connected step-up transformer (T)3) The voltage of the grid-connected point suddenly changes and the output power of the three-phase inverter (N) suddenly changes to be judged as an isolated island operation state of the three-phase inverter (N);
c. the control module generates a trip signal to control the railway 10kV power supply system (G) and the grid-connected step-up transformer (T) under the fault-tolerant operation state3) The high-voltage circuit breaker in the intermediate switch cabinet is disconnected, and a simultaneous combined-tripping traction transformer (T) and a left-side and right-side multi-winding step-down transformer (T) are connected1、T2) The intermediate switch cabinet controls the high-voltage circuit breakers in the corresponding switch cabinet to be switched off, and the self-protection function of the fault equipment of the substation is realized;
the control module generates a trip signal to control a railway 10kV power supply system (G) and a grid-connected step-up transformer (T) in an island operation state of the three-phase inverter (N)3) The high-voltage circuit breaker in the intermediate switch cabinet is disconnected, and a simultaneous combined-tripping traction transformer (T) and a left-side and right-side multi-winding step-down transformer (T) are connected1、T2) The intermediate switch cabinet controls the high-voltage circuit breakers in the corresponding switch cabinet to be switched off;
d. after tripping is caused by a fault which cannot be fault-tolerant, each breaker is switched off and then is delayed for 2.0 seconds to carry out automatic reclosing, if the reclosing is successful, the system continues to operate, and if the reclosing is failed, a permanent fault is determined, and the control module sends out a secondary alarm; after tripping is caused by the isolated island operation state of the three-phase inverter (N), reclosing operation is not carried out.

Claims (1)

1. A protection method for a regenerative braking energy feedback system of a high-speed rail is characterized by comprising the following steps
Step 1: collecting real-time signals, comprising: single-phase alternating current voltage and current at a feeder line outlet of the traction transformer T; left side multi-winding step-down transformer T1And a right-side multi-winding step-down transformer T2Primary side port of (3) single-phase alternating voltage, current, T1And T2Secondary side port of the primary side of the secondary side of the transformer1And T2Oil level height, temperature; left-side multiple four-quadrant converter B1Each single group of four-quadrant converters B1iThe AC side port of (A) is connected with a single-phase AC voltage, current, each B1iDirect side direct voltage of (B) each1iThe IGBT element terminal voltage of (1); right-side multiple four-quadrant converter B2Each single group of four-quadrant converters B2iThe AC side port of (A) is connected with a single-phase AC voltage, current, each B2iDirect side direct voltage of (B) each2iThe IGBT element terminal voltage of (1); b is1And B2Direct current side anode direct current bus D1And a negative DC bus D2A direct current voltage; the output end of the three-phase inverter N is used for outputting three-phase alternating current voltage and current; the IGBT element terminal voltage of N; grid-connected step-up transformer T3Primary side port and secondary side port of the three-phase AC voltage, current, T3Oil level, temperature, T3The grid-connected point three-phase alternating-current voltage; three-phase alternating current voltage and current at the incoming line end of a railway 10kV power grid G;
step 2: setting the protection priority as: 1) t and G; 2) t is1、T2N and T3；3)B1And B2；
If different equipment simultaneously generates faults, sequentially performing protection actions according to the priority order;
determining the running state of the system according to the real-time signal, carrying out-of-limit judgment, and outputting a tripping or warning signal according to the protection logic;
and step 3: setting the reclosing priority as follows: 1) t and T1Switch cabinet K connected with each other1T and T2Switch cabinet K connected with each other2G and T3Switch cabinet K connected with each other7；2)T1And B1Switch cabinet K connected with each other3，T2And B2Switch cabinet K connected with each other4，D1And D2And N connected switch cabinet K5N and T3Switch cabinet K connected with each other6；3)B1Each single group of four-quadrant converters B1iA switch cabinet connected therebetween, B2Each single group of four-quadrant converters B2iA switch cabinet connected with the switch cabinet;
after the tripping action occurs, delaying and then carrying out primary reclosing, and if the reclosing is successful, restoring the normal operation of the system; wherein, B1And B2The input mode is step-by-step input; if the switching-on fails, judging the permanent fault and sending a secondary alarm;
in said step 2, the protection logic comprises
A traction transformer T: generating a trip signal to control K under the fault-tolerant operation state1And K2Is disconnected and simultaneously linked to trip K7Controlling the high-voltage circuit breaker to be disconnected;
left side multi-winding step-down transformer T1And a right-side multi-winding step-down transformer T2: generating a trip signal to control K under the fault-tolerant operation state1And K2Is disconnected and simultaneously linked to trip K7Controlling the high-voltage circuit breaker to be disconnected; generating corresponding alarm signals under fault-tolerant operation fault states;
left-side multiple four-quadrant converter B1And a right-side multiple four-quadrant converter B2: generating a trip signal to control K under the fault-tolerant operation state3、K4And K5Is opened and simultaneously linked to trip K1、K2And K7Controlling the high-voltage circuit breaker to be disconnected; generating corresponding alarm signals under fault-tolerant operation fault states;
three-phase inverter N: generating a trip signal to control K under the fault-tolerant operation state5And K6Is opened and simultaneously linked to trip K3、K4And K7Controlling the high-voltage circuit breaker to be disconnected and quitting the whole feedback device; generating corresponding alarm signals under fault-tolerant operation fault states;
grid-connected step-up transformer T3: generating a trip signal to control K under the fault-tolerant operation state7Is disconnected and simultaneously linked to trip K1And K2Controlling the high-voltage circuit breaker to be disconnected; generating corresponding alarm signals under fault-tolerant operation fault states;
railway 10kV electric network G: generating a trip signal to control K under the fault-tolerant operation state7Is disconnected and simultaneously linked to trip K1And K2Controlling the high-voltage circuit breaker to be disconnected; generating a trip signal under the N isolated island operation state of the three-phase inverter to control K7Is disconnected and simultaneously linked to trip K1And K2And controlling the high-voltage circuit breaker to be disconnected.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113514774A (en) * 2021-08-09 2021-10-19 珠海万力达电气自动化有限公司 Method and device for judging unstable operation of railway interconnected power supply
CN114157163A (en) * 2021-12-07 2022-03-08 西南交通大学 Protection method of multi-station comprehensive renewable energy utilization system of heavy haul railway

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US20130175855A1 (en) * 2012-01-05 2013-07-11 Eun Kyu Lee Energy Storage Apparatus for Railway Vehicles by Adopting a Bidirectional DC-DC Converter
CN106841926A (en) * 2017-03-14 2017-06-13 哈尔滨理工大学 Photovoltaic parallel in system island detection method based on non-blind area self adaptation AFDPF algorithms
CN109466334A (en) * 2018-10-22 2019-03-15 西南交通大学 A kind of high-speed rail regenerating braking energy storage system guard method

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Publication number Priority date Publication date Assignee Title
US20130175855A1 (en) * 2012-01-05 2013-07-11 Eun Kyu Lee Energy Storage Apparatus for Railway Vehicles by Adopting a Bidirectional DC-DC Converter
CN106841926A (en) * 2017-03-14 2017-06-13 哈尔滨理工大学 Photovoltaic parallel in system island detection method based on non-blind area self adaptation AFDPF algorithms
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113514774A (en) * 2021-08-09 2021-10-19 珠海万力达电气自动化有限公司 Method and device for judging unstable operation of railway interconnected power supply
CN114157163A (en) * 2021-12-07 2022-03-08 西南交通大学 Protection method of multi-station comprehensive renewable energy utilization system of heavy haul railway

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