CN112186773A

CN112186773A - Traction power supply network tail end voltage stabilizing device and traction power supply network stabilizing system

Info

Publication number: CN112186773A
Application number: CN202010977444.6A
Authority: CN
Inventors: 周少飞; 王碰雄; 高飞
Original assignee: Shenshuo Railway Branch of China Shenhua Energy Co Ltd
Current assignee: Shenshuo Railway Branch of China Shenhua Energy Co Ltd
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2021-01-05

Abstract

The application provides a traction power supply network tail end voltage stabilizing device and a traction power supply network stabilizing system. The traction power supply network terminal voltage stabilizing device comprises: voltage detection circuit, control circuit and alternating current power circuit. The voltage detection circuit is used for detecting the power supply voltage at the tail end of the power supply network uplink or downlink bus. The control circuit is electrically connected with the voltage detection circuit. The control circuit is used for receiving the power supply voltage. The alternating current power circuit is electrically connected with the control circuit. And the alternating current power circuit is used for outputting reactive power to the tail end of the power supply network uplink or downlink bus. The control circuit is further configured to control the reactive power output by the ac power circuit based on the supply voltage and a target voltage, so that the supply voltage is stabilized at the target voltage.

Description

Traction power supply network tail end voltage stabilizing device and traction power supply network stabilizing system

Technical Field

The application relates to the technical field of railway power supply, in particular to a traction power supply network tail end voltage stabilizing device and a traction power supply network stabilizing system.

Background

With the continuous development of electrified railways, the long-distance power supply of power supply lines is promoted to be more and more widely applied. However, a series of problems are brought along, such as reduction of the voltage of the dead end network caused by increase of inductive reactive loss of the line in a heavy load period, increase of the voltage of the dead end network caused by capacitive reactive of the line in a light load period, and the like in the long-distance power supply system.

Aiming at the problem of instability of the tail-end network voltage in a long-distance power supply system, the power supply capacity is improved by methods such as enlarging the capacity of a transformer, enlarging the line path of a distribution line, shortening the length of a power supply network and the like at present, but the methods mainly reduce the loss of the tail-end voltage by reducing the equivalent impedance of the transformer and the line and do not directly adjust the tail-end voltage in real time.

Disclosure of Invention

Therefore, it is necessary to provide a device for stabilizing the tail-end voltage of the traction power supply network and a system for stabilizing the tail-end voltage of the traction power supply network, aiming at the problem that the tail-end network voltage in the existing power supply system is unstable.

An apparatus for stabilizing the voltage at the end of a traction power supply network, comprising:

the voltage detection circuit is used for detecting the power supply voltage at the tail end of the uplink or downlink bus of the power supply network;

the control circuit is electrically connected with the voltage detection circuit and used for receiving the power supply voltage; and

the alternating current power circuit is electrically connected with the control circuit and is used for outputting reactive power to the tail end of the power supply network uplink or downlink bus;

the control circuit is further configured to control the reactive power output by the ac power circuit based on the supply voltage and a target voltage, so that the supply voltage is stabilized at the target voltage.

In one embodiment, the control circuit is configured to compare the supply voltage to the target voltage;

if the power supply voltage is smaller than the target voltage, the control circuit controls the alternating current power circuit to output capacitive reactive power so that the power supply voltage is stabilized at the target voltage;

if the power supply voltage is greater than the target voltage, the control circuit controls the alternating current power circuit to output inductive reactive power so that the power supply voltage is stabilized at the target voltage.

In one embodiment, the device for stabilizing the tail end voltage of the traction power supply network further comprises:

the first end of the starting circuit is electrically connected with the tail end of the power supply network uplink or downlink bus, the second end of the starting circuit is electrically connected with the output end of the alternating current power circuit, and the starting circuit is used for controlling the conduction and the disconnection between the alternating current power circuit and the tail end of the power supply network uplink or downlink bus.

In one embodiment, the start-up circuit includes:

the first end of the contactor is used for being electrically connected with the tail end of an uplink or downlink bus of the power supply network, and the second end of the contactor is electrically connected with the output end of the alternating current power circuit; and

the first end of the soft charging resistor is electrically connected with the first end of the contactor, and the second end of the soft charging resistor is connected with the second end of the contactor and the output end of the alternating current power circuit.

In one embodiment, the start-up circuit further comprises:

a first end of the first isolating switch is used for being electrically connected with the tail end of an uplink or downlink bus of the power supply network, a second end of the first isolating switch is commonly connected with a first end of the soft charging resistor and a first end of the contactor, and a third end of the first isolating switch is electrically connected with the control circuit; and

the first end of the current transformer is connected with the second end of the first isolating switch and the first end of the contactor in a shared mode, the second end of the current transformer is electrically connected with the control circuit, the control circuit collects real-time current flowing through the starting circuit through the current transformer and determines whether to control the first isolating switch to be disconnected or not according to the real-time current.

In one embodiment, the start-up circuit further comprises:

the first end of the lightning arrester is electrically connected with the first end of the first isolating switch, and the second end of the lightning arrester is grounded; and

and a first end of the reactor is connected with a second end of the soft charging resistor and a second end of the contactor in a common mode, and a second end of the reactor is electrically connected with an output end of the alternating current power circuit.

In one embodiment, the ac power circuit includes: a plurality of cascaded inverters, each of the inverters electrically connected to the control circuit.

A traction power supply network stabilization system comprising:

a first circuit breaker, a first end of the first circuit breaker is used for electrically connecting with a power supply bus, a second end of the first circuit breaker is electrically connected with a power supply network up-line bus, and a tail end of the power supply network up-line bus is electrically connected with a traction power supply network tail end voltage stabilizing device according to any one of claims;

a second circuit breaker, a first end of the second circuit breaker is used for electrically connecting the power supply bus, a second end of the second circuit breaker is electrically connected with a power supply network down bus, and a tail end of the power supply network down bus is electrically connected with the traction power supply network tail end voltage stabilizing device according to any one of claims; and

and the first end of the second isolating switch is electrically connected with the second end of the first circuit breaker, and the second end of the second isolating switch is electrically connected with the second end of the second circuit breaker.

In one embodiment, the traction power supply network stabilizing system further comprises:

and the environment detection device is electrically connected with the control circuit and is used for detecting the environment parameters of the environments where the power supply network uplink bus and the power supply network downlink bus are located, and the control circuit determines whether to generate the ice melting instruction according to the environment parameters.

In one embodiment, if the control circuit generates an ice melting instruction, the first circuit breaker and the second circuit breaker are controlled to be disconnected, and the second isolating switch is controlled to be connected.

a third circuit breaker, a first end of the third circuit breaker being for electrical connection with the supply bus; and

and the first end of the third isolating switch is connected with the second end of the third circuit breaker and the second end of the second isolating switch in a common way, and the second end of the third isolating switch is electrically connected with the second end of the second circuit breaker.

Compared with the prior art, the voltage stabilizing device and the voltage stabilizing system at the tail end of the traction power supply network detect the power supply voltage at the tail end of the uplink or downlink bus of the power supply network in real time through the voltage detection circuit. Meanwhile, the control circuit is matched with the control circuit, the reactive power output by the alternating current power circuit is controlled by the control circuit based on the power supply voltage and the target voltage, so that the stable control of the voltage at the tail end of the uplink or downlink bus of the power supply network is realized, the power supply voltage is stabilized at the target voltage, and the stability is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a circuit block diagram of a device for stabilizing a voltage at an end of a traction power supply network according to an embodiment of the present application;

FIG. 2 is a block circuit diagram of a device for stabilizing the voltage at the end of a traction power supply network according to another embodiment of the present application;

fig. 3 is a circuit diagram of an application of a start-up circuit according to an embodiment of the present application;

FIG. 4 is a schematic circuit diagram of a system for stabilizing a traction power supply network according to an embodiment of the present application;

fig. 5 is a schematic circuit diagram of a system for stabilizing a traction power supply network according to another embodiment of the present application.

Description of reference numerals:

10. a voltage stabilizing device at the tail end of the traction power supply network; 101. a power supply network uplink or downlink bus; 102. an up bus of the power supply network; 103. a power supply network downlink bus; 100. a voltage detection circuit; 20. a traction supply network stabilization system; 200. a control circuit; 300. an alternating current power circuit; 400. a start-up circuit; 410. a contactor; 420. a soft charging resistor; 430. a first isolation switch; 440. a current transformer; 450. a lightning arrester; 460. a reactor; 510. a first circuit breaker; 520. a second circuit breaker; 530. a second isolation switch; 540. an environment detection device; 550. a third circuit breaker; 560. and a third isolating switch.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.

The numbering of the components as such, e.g., "first", "second", etc., is used herein for the purpose of describing the objects only, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, an embodiment of the present application provides a device 10 for stabilizing the terminal voltage of a traction power supply network. The traction power supply network end voltage stabilizing device 10 comprises: voltage detection circuit 100, control circuit 200, and ac power circuit 300. The voltage detection circuit 100 is configured to detect a supply voltage at a terminal of an uplink or downlink bus 101 of a power supply network. The control circuit 200 is electrically connected to the voltage detection circuit 100. The control circuit 200 is configured to receive the supply voltage. The ac power circuit 300 is electrically connected to the control circuit 200. The ac power circuit 300 is configured to output reactive power to the end of the uplink or downlink bus 101 of the power supply network. The control circuit 200 is further configured to control the reactive power output by the ac power circuit 300 based on the supply voltage and a target voltage, so that the supply voltage is stabilized at the target voltage.

It is understood that the specific circuit topology of the voltage detection circuit 100 is not limited as long as it has the function of detecting the supply voltage at the end of the power supply network up or down bus 101. In one embodiment, the voltage detection circuit 100 may be a voltage transformer. In one embodiment, the voltage detection circuit 100 may also be a voltage sensor. In one embodiment, the control circuit 200 may be a CPU. In one embodiment, the control circuit 200 may be a single chip. The voltage detection circuit 100 can detect the power supply voltage at the tail end of the power supply network uplink or downlink bus 101 in real time, and meanwhile, the voltage detection circuit 100 can send the detected power supply voltage to the control circuit 200 in real time, so that the control circuit 200 can conveniently perform subsequent processing.

It is understood that the specific circuit topology of the ac power circuit 300 is not limited as long as it has the function of outputting reactive power to the end of the up or down bus 101 of the power supply network. In one embodiment, the ac power circuit 300 may include a plurality of cascaded inverters. Wherein each inverter may be composed of a plurality of IGBTs (Insulated Gate Bipolar transistors). The ac power circuit 300 can perform reactive power compensation on the power supply voltage at the end of the uplink or downlink bus 101 of the power supply network, so that the power supply voltage is stabilized at the target voltage, thereby ensuring the stability of the power supply voltage.

Specifically, after the control circuit 200 receives the power supply voltage detected by the voltage detection circuit 100 in real time, the control circuit 200 may compare the power supply voltage with a target voltage. If the power supply voltage is less than the target voltage, that is, the power supply voltage provided at the end of the uplink or downlink bus 101 of the power supply network is too low, the control circuit 200 may control the ac power circuit 300 to output capacitive reactive power, so that the power supply voltage is stabilized at the target voltage. The reason that the supply voltage is too low is mainly that the line voltage drop is generated due to the fact that the line has excessive inductive reactive power in the load period. At this time, the control circuit 200 may control the capacitive reactive power output by the ac power circuit 300 based on the supply voltage and the target voltage, so as to compensate the supply voltage, and ensure that the supply voltage is stabilized at the target voltage.

If the supply voltage is greater than the target voltage, that is, the supply voltage provided by the end of the uplink or downlink bus 101 of the power supply network is too high, the control circuit 200 may control the ac power circuit 300 to output inductive reactive power, so that the supply voltage is stabilized at the target voltage. The reason that the power supply voltage is too high is mainly that due to long-distance power transmission, the capacitance effect of the line to the ground causes the voltage at the tail end to be raised, and at the moment, the capacitive reactive power of the line is too much. At this time, the control circuit 200 may control the inductive reactive power output by the ac power circuit 300 based on the supply voltage and the target voltage, so as to compensate the supply voltage, so as to ensure that the supply voltage is stabilized at the target voltage. Namely, the power supply voltage provided by the tail end of the power supply network uplink or downlink bus 101 can be stabilized near the target voltage by the above mode, and the stability is improved.

If the supply voltage is equal to the target voltage, that is, the supply voltage provided by the end of the uplink or downlink bus 101 of the power supply network is normal, the control circuit 200 may control the ac power circuit 300 not to output reactive power. I.e. no compensation of the supply voltage is required at this time. In one embodiment, the target voltage may be set according to actual requirements, and is not limited to a specific value.

In this embodiment, the voltage detection circuit 100 detects the power supply voltage at the end of the uplink or downlink bus 101 of the power supply network in real time. Meanwhile, the control circuit 200 is matched with the control circuit 200, and the reactive power output by the alternating current power circuit 300 is controlled by the control circuit 200 based on the power supply voltage and the target voltage, so that the voltage at the tail end of the uplink or downlink bus 101 of the power supply network is stably controlled, the power supply voltage is stabilized at the target voltage, and the stability is improved.

Referring to fig. 2, in an embodiment, the device for stabilizing the terminal voltage of the traction power supply network further includes: the circuit 400 is enabled. The first end of the starting circuit 400 is used for being electrically connected with the tail end of the power supply network uplink or downlink bus 101. A second terminal of the start-up circuit 400 is electrically connected to an output terminal of the ac power circuit 300. The starting circuit 400 is used for controlling the conduction and the disconnection between the alternating current power circuit 300 and the end of the up or down bus 101 of the power supply network.

It is understood that the specific circuit topology of the start-up circuit 400 is not limited as long as it has the function of controlling the conduction and disconnection between the ac power circuit 300 and the end of the supply grid up or down bus 101. In one embodiment, the start-up circuit 400 may be an intelligent switch and resistor. Wherein, the intelligent switch can be a circuit breaker. In one embodiment, the starting circuit 400 can also be a contactor, a resistor, an arrester, and the like. The starting circuit 400 can control the conduction and the disconnection between the alternating current power circuit 300 and the tail end of the power supply network uplink or downlink bus 101, so as to control whether the alternating current power circuit 300 is connected to the tail end of the power supply network uplink or downlink bus 101.

Referring to fig. 3, in one embodiment, the start-up circuit 400 includes: a contactor 410 and a soft charging resistor 420. The first end of the contactor 410 is used for being electrically connected with the tail end of the power supply network uplink or downlink bus 101. The second terminal of the contactor 410 is electrically connected to the output terminal of the ac power circuit 300. A first terminal of the soft charging resistor 420 is electrically connected to a first terminal of the contactor 410. The second terminal of the soft charging resistor 420 is connected to the second terminal of the contactor 410 and the output terminal of the ac power circuit 300.

In one embodiment, the soft charging resistor 420 may be a fixed resistor. In one embodiment, the soft charging resistor 420 may also be a variable resistor. Through the both ends of contactor 410 are parallelly connected soft charging resistance 420, through to soft charging resistance 420's precharge, can realize right contactor 410's protection avoids contactor 410 damages because of the electric current is too big when switching on.

In one embodiment, the start-up circuit 400 further comprises: a first isolation switch 430 and a current transformer 440. The first end of the first isolating switch 430 is used for being electrically connected with the tail end of the power supply network uplink or downlink bus 101. The second terminal of the first isolation switch 430 is connected to the first terminal of the soft charging resistor 420 and the first terminal of the contactor 410. The third terminal of the first isolating switch 430 is electrically connected to the control circuit 200. The first terminal of the current transformer 440 is connected to the second terminal of the first isolating switch 430 and the first terminal of the contactor 410. A second terminal of the current transformer 440 is electrically connected to the control circuit 200. The control circuit 200 collects a real-time current flowing through the starting circuit 400 through the current transformer 440, and determines whether to control the first isolating switch 430 to be turned off according to the real-time current.

In one embodiment, the closing mode of the first isolation switch 430 may be controlled automatically or manually. Namely, the first isolating switch 430 can also be controlled to be closed by means of manual closing. Through setting up first isolator 430 can be convenient for electrical isolation and ground connection operation when the equipment overhauls, improve the security of operation. In one embodiment, the common connection of the first terminal of the current transformer 440, the second terminal of the first isolating switch 430 and the first terminal of the contactor 410 means: the current transformer 440 may be disposed on a wire between the second end of the first isolation switch 430 and the first end of the contactor 410. In this way, the current transformer 440 may detect the real-time current flowing through the starting circuit 400 in real time, and the current transformer 440 may transmit the detected real-time current to the control circuit 200. The control circuit 200 receives the real-time current and determines whether to control the first isolating switch 430 to be turned off according to the real-time current.

Specifically, the control circuit 200 may compare the real-time current with a set current threshold, and if the real-time current is greater than or equal to the set current threshold, the control circuit 200 may control the first isolating switch 430 to be turned off, so as to protect the ac power circuit 300 and prevent the ac power circuit from being damaged. On the contrary, if the real-time current is smaller than the set current threshold, the control circuit 200 does not need to control the first isolating switch 430 to be turned off. I.e. when the real-time current flowing through the start-up circuit 400 is normal. Therefore, the first isolating switch 430, the current transformer 440 and the control circuit 200 are matched, so that the overcurrent protection of the alternating current power circuit 300 can be realized, and the safety is improved.

In one embodiment, the start-up circuit 400 further comprises: an arrester 450 and a reactor 460. A first end of the arrester 450 is electrically connected to a first end of the first disconnector 430. The second end of the arrester 450 is grounded. A first terminal of the reactor 460 is connected to a second terminal of the soft charging resistor 420 and a second terminal of the contactor 410. A second terminal of the reactor 460 is electrically connected to an output terminal of the ac power circuit 300. In one embodiment, the starting circuit 400 can achieve overvoltage protection by providing the lightning arrester 450, thereby improving safety. In one embodiment, the starting circuit 400 is electrically connected to the output end of the ac power circuit 300 through the reactor 460, so that the output end of the ac power circuit 300 can output reactive power to the end of the power grid up or down bus 101.

In one embodiment, the traction supply network terminal voltage stabilizing device 10 may be electrically connected to the terminal of the power supply network uplink or downlink bus 101 through a connecting reactor, and the phase and amplitude of the output voltage at the ac side of the ac power circuit 300 may be appropriately adjusted, so that the ac power circuit 300 may absorb or emit a reactive current meeting the requirement, and dynamic reactive power compensation may be performed on the power supply network uplink or downlink bus 101, thereby improving the stability of power supply.

Referring to fig. 4, another embodiment of the present application provides a traction supply network stabilization system 20. The traction supply network stabilising system 20 comprises: a first circuit breaker 510, a second circuit breaker 520, and a second disconnector 530. The first end of the first circuit breaker 510 is used to electrically connect the power bus 511. The second end of the first breaker 510 is electrically connected to the supply grid up bus 102. The tail end of the power supply network uplink bus 102 is electrically connected with the tail end voltage stabilizing device 10 of the traction power supply network in any one of the above embodiments. The first end of the second circuit breaker 520 is used to electrically connect the power bus 511. The second end of the second breaker 520 is electrically connected to the supply grid down bus 103. The tail end of the power supply network downlink bus 103 is electrically connected with the traction power supply network tail end voltage stabilizing device 10 in any one of the above embodiments. A first terminal of the second disconnection switch 530 is electrically connected to a second terminal of the first circuit breaker 510. A second terminal of the second disconnector 530 is electrically connected to a second terminal of the second circuit breaker 520.

In one embodiment, the first circuit breaker 510 is provided to facilitate control of the connection and disconnection between the power supply grid up bus 102 and the power supply bus 511. Similarly, the second breaker 520 can be arranged to facilitate the control of the connection and disconnection between the power supply network down bus 103 and the power supply bus 511. Therefore, whether the power supply bus 511 is connected with or disconnected from the power supply network uplink bus 102 or the power supply bus 511 is connected with the power supply network downlink bus 103 can be controlled, and the operation safety is improved.

In an embodiment, please refer to the structure described in the above embodiment for the specific structure of the tail-end voltage stabilizing device 10 of the traction power supply network, which is not described herein again. In one embodiment, the second isolation switch 530 may have the same structure as the first isolation switch 430 in the above embodiments, and is not described herein again.

In one embodiment, when the traction supply network stabilization system 20 encounters line icing, the first circuit breaker 510 and the second circuit breaker 520 may be controlled to open while the second disconnector 530 is controlled to close, and a loop may be formed between the supply network upstream bus 102 and the supply network downstream bus 103. Namely, a loop is formed between the supply grid up bus 102, the supply grid down bus 103 and the two groups of traction supply grid end voltage stabilizing devices 10.

Thus, the voltage stabilizing device 10 at the tail end of the power supply network uplink bus 102 is adjusted to emit inductive (capacitive) reactive current, and the voltage stabilizing device 10 at the tail end of the power supply network downlink bus 103 is adjusted to emit capacitive (inductive) reactive current, so that the two groups of voltage stabilizing devices 10 at the tail end of the traction power supply network output working currents with equal current, opposite phases and the same frequency, and form current circulation in a loop. The provided current (the current amplitude is determined according to different line lengths) generates heat after flowing through the line, and the ice coating on the line is gradually melted, so that the ice melting function is realized.

In this embodiment, by switching the first circuit breaker 510, the second circuit breaker 520 and the second isolating switch 530, a loop is formed among the power supply network uplink bus 102, the power supply network downlink bus 103 and the two groups of traction power supply network terminal voltage stabilizing devices 10, so that ice coating on the line is melted, and thus, the ice melting function is realized.

In one embodiment, the traction power supply network stabilizing system further comprises: an environment detection device 540. The environment detection device 540 is electrically connected to the control circuit 200. The environment detection device 540 is configured to detect an environmental parameter of an environment where the power supply network uplink bus 102 and the power supply network downlink bus 103 are located. The control circuit 200 determines whether to generate an ice-melting instruction according to the environmental parameter.

In one embodiment, the environment detection device 540 may include a temperature sensor, a humidity sensor, a weather sensor, and the like. The environment detection device 540 detects the environment parameters of the environment where the power supply network uplink bus 102 and the power supply network downlink bus 103 are located in real time. The environmental parameters may include temperature, humidity, weather, and other parameters. The control circuit 200 may determine whether to generate an ice-melt instruction based on the environmental parameter. Specifically, the control circuit 200 may compare the environmental parameter with a set environmental threshold, and if the environmental parameter is greater than or equal to the set environmental threshold, the control circuit 200 generates the ice-melting instruction. Meanwhile, the control circuit 200 can send the ice melting instruction to an upper computer,

the upper computer can control the first circuit breaker 510 and the second circuit breaker 520 to be disconnected and control the second isolating switch 530 to be switched on. The upper computer can also prompt staff through an alarm, and ice melting is needed at the moment. That is, the first circuit breaker 510, the second circuit breaker 520, and the second isolation switch 530 may be switched manually by a worker, or may be automatically controlled by a control device.

In one embodiment, the supply grid up bus 102 end may be electrically connected to the traction supply grid end voltage stabilization device 10 through a circuit breaker. The same terminal of the down bus 103 of the supply network can also be electrically connected to the terminal voltage stabilization device 10 of the traction supply network via a circuit breaker.

Referring to fig. 5, in one embodiment, the traction supply network stabilizing system 20 further includes: a third circuit breaker 550 and a third disconnector 560. A first end of the third circuit breaker 550 is used for electrically connecting with the power supply bus 511. A first terminal of the third disconnection switch 560 is commonly connected to a second terminal of the third circuit breaker 550 and a second terminal of the second disconnection switch 530. A second terminal of the third disconnector 560 is electrically connected to a second terminal of the second circuit breaker 520.

In an embodiment, the third circuit breaker 550 and the third disconnecting switch 560 may both adopt the structures of the first disconnecting switch 430 and the first circuit breaker 510 in the above embodiments, and details thereof are omitted. Through setting up third circuit breaker 550 and third isolator 560, with second isolator 530 cooperates, can realize right first circuit breaker 510 or second circuit breaker 520 overhauls, improves the security of operation.

To sum up, the present application detects the power supply voltage at the end of the uplink or downlink bus 101 of the power supply network in real time through the voltage detection circuit 100. Meanwhile, the control circuit 200 is matched with the control circuit 200, and the reactive power output by the alternating current power circuit 300 is controlled by the control circuit 200 based on the power supply voltage and the target voltage, so that the voltage at the tail end of the uplink or downlink bus 101 of the power supply network is stably controlled, the power supply voltage is stabilized at the target voltage, and the stability is improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A traction power supply grid end voltage stabilization apparatus, comprising:

2. The traction supply network end-of-voltage stabilizing arrangement of claim 1 wherein the control circuit is operable to compare the supply voltage with the target voltage;

3. The traction supply network end-of-voltage stabilization apparatus of claim 1, further comprising:

4. The traction supply network end-of-voltage stabilizing arrangement of claim 3, wherein the start-up circuit comprises:

5. The traction supply network end-of-voltage stabilizing arrangement of claim 4, wherein the start-up circuit further comprises:

6. The traction supply network end-of-voltage stabilizing arrangement of claim 5, wherein the start-up circuit further comprises:

7. The traction supply network end-of-voltage stabilizing arrangement of claim 1, wherein the ac power circuit comprises: a plurality of cascaded inverters, each of the inverters electrically connected to the control circuit.

8. A traction power supply network stabilization system, comprising:

a first circuit breaker, a first end of the first circuit breaker is used for electrically connecting with a power supply bus, a second end of the first circuit breaker is electrically connected with a power supply network up-line bus, and a tail end of the power supply network up-line bus is electrically connected with the traction power supply network tail end voltage stabilizing device according to any one of claims 1-7;

a second circuit breaker, a first end of the second circuit breaker is used for electrically connecting the power supply bus, a second end of the second circuit breaker is electrically connected with a power supply network down bus, and a tail end of the power supply network down bus is electrically connected with the traction power supply network tail end voltage stabilizing device according to any one of claims 1-7; and

9. The traction power supply network stabilizing system of claim 8 further comprising:

10. The traction supply network stabilization system of claim 9, wherein if the control circuit generates an ice melt instruction, the first circuit breaker and the second circuit breaker are controlled to open and the second disconnector is controlled to conduct.

11. The traction power supply network stabilizing system of claim 8 further comprising: