CN109038518B - Fixed value setting and action matching method for multi-terminal direct-current line protection - Google Patents
Fixed value setting and action matching method for multi-terminal direct-current line protection Download PDFInfo
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- CN109038518B CN109038518B CN201810952698.5A CN201810952698A CN109038518B CN 109038518 B CN109038518 B CN 109038518B CN 201810952698 A CN201810952698 A CN 201810952698A CN 109038518 B CN109038518 B CN 109038518B
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
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- 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
- H02H3/006—Calibration or setting of parameters
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Abstract
The invention discloses a fixed value setting and action matching method for multi-terminal direct-current line protection, wherein the fixed value setting method comprises a two-terminal operation fixed value setting method and a multi-terminal operation fixed value setting method, and the action matching method comprises the steps of constructing a multi-terminal direct-current power transmission system, carrying out the setting on the constructed system based on the multi-terminal direct-current line protection fixed value method, and carrying out corresponding converter valve forced phase shifting, extreme shutdown or restart operation according to specific conditions after a rectifying station in the system receives line protection action, bus bar differential protection action and extreme protection action signals; the constant value method can solve the difficult problems of the multi-terminal direct current line protection in the aspects of constant value setting and protection action selectivity, can ensure the equipment and personal safety based on the constant value setting and action matching method, improves the operation reliability of the multi-terminal direct current transmission system, and has strong operability.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a constant value setting and action matching method for multi-terminal direct-current line protection.
Background
Statistics show that the direct current system fault is mainly a direct current line fault, so that reliable direct current line protection has great significance for guaranteeing the safety of the high-voltage direct current transmission system. Unlike a two-terminal dc system, a multi-terminal dc system includes a plurality of dc lines, and how to ensure reliable protection of the dc lines is a key issue for protecting the multi-terminal dc system.
In a multi-terminal dc transmission system, the different dc lines are usually connected within the dc converter station by a bus bar. Because most direct current line faults are transient faults, after the direct current line is subjected to protection judgment and is exported, a direct current fault restarting strategy is usually adopted, namely the current of the direct current line is reduced to zero, and the direct current voltage is reduced to zero or even negative pressure, so that the aim of removing the transient faults freely is fulfilled. However, the bus bar is positioned in the station, if the ground fault occurs, the bus bar is mostly a permanent fault, once the fault occurs, the multi-terminal direct current system is required to be shut down so as to ensure the personal safety of equipment and operators in the station. The bus bar is usually configured with bus bar differential protection, that is, the difference between the currents of a plurality of direct current lines is used to determine whether the fault is located in the bus bar area. The converter station is usually provided with direct current pole protection to protect the faults in the converter station.
In a two-terminal system, normally, a valve-side fault protection of a station smoothing reactor is not operated as a fixed value setting principle. However, in a multi-terminal system, due to the complex operation mode of the system and the wide distribution of fault characteristics, the matching difficulty of the line protection fixed values of all the converter stations is very high. If the fixed values are all set to be low, faults in the bus bar and even in the adjacent converter stations can cause misoperation of the line protection of the station; if the fixed values are all set to be higher, the line protection with high action speed such as traveling wave protection and the like can be refused under the condition of line far-end fault.
If the protection constant value and the protection action of the multi-end line are not matched properly, a fault restarting strategy is executed according to the line protection action under the condition that a bus or a converter station has a fault possibly, and equipment and personal safety in the converter station are threatened; or in the case of a line fault, the line protection cannot act quickly. In order to solve the above-mentioned difficult problem of the multi-terminal dc line protection, it is urgent to research a coordination scheme of the multi-terminal dc line protection in terms of protection setting value and protection action.
Disclosure of Invention
The constant value setting and action matching method for the multi-terminal direct current line protection can solve the problem of constant value of the multi-terminal direct current line protection, can guarantee equipment and personal safety based on the operation method of the constant value method, improves the operation reliability of a multi-terminal direct current transmission system, and has strong operability.
In order to achieve the above object, the present invention provides a method for setting a fixed value and coordinating actions of a multi-terminal dc line protection, which comprises the following steps:
a fixed value setting method for multi-terminal direct current line protection comprises a two-terminal operation fixed value setting method and a multi-terminal operation fixed value setting method, wherein the two-terminal operation fixed value setting method is that a direct current line protection area comprises a direct current line between a current measuring point of a direct current line of a current station and a smoothing reactor of a counter station and all equipment, and the fixed value setting principle is that valve side fault protection of the smoothing reactor of an adjacent converter station does not act; the multi-end operation fixed value method is characterized in that the direct current line protection under the operation mode of two ends of adjacent converter stations is reserved, and the direct current line protection under the operation mode of two ends of non-adjacent converter stations is quitted; and a section of traveling wave protection is added in the rectifier station, the protection range can be further extended to the next line, and the constant value setting principle is that the alternating current fault protection of the adjacent converter station does not act.
A multi-terminal direct-current line protection action coordination method comprises the steps of constructing a multi-terminal direct-current power transmission system, carrying out value setting on the constructed system based on the multi-terminal direct-current line protection value setting method, and carrying out corresponding operation after a rectification station in the system receives a protection action signal, wherein the specific operation method comprises the following steps:
when the rectifier station receives a line fault restart command transmitted by a direct current line protection device of the rectifier station or other stations, the converter valve of the rectifier station is controlled to forcibly shift the phase according to the line fault restart command;
during the phase shifting period of the rectifier station, if a bus bar differential protection action signal is received, an emergency shutdown command is issued, and all converter stations execute the emergency shutdown;
during the phase shifting of the rectifier station, if pole protection action signals of other converter stations are received, when the fault converter station is the only rectifier station or the only inverter station in operation of the system, a pole locking command is executed; if the fault converter station is not the only current rectifier station or the only current converter station, executing a restart command of the isolated fault converter station;
and during the phase shifting of the rectifier station, if signals of other converter station pole protection and bus protection actions are not received, after the dissociating time is waited to be removed, executing a valve restarting command and subsequent operations according to a line fault restarting strategy.
Preferably, the multi-terminal dc power transmission system comprises: m rectifier stations and N inverter stations, wherein M and N are integers more than or equal to 1, M + N is an integer more than or equal to 3, different direct current lines are connected to a bus bar, and the bus bar is located in one converter station.
Preferentially, the converter stations comprise pole control devices, line protection devices and pole protection devices, wherein the pole control devices of different converter stations are in communication connection with each other, and the line protection devices of different converter stations are in communication connection with each other; and communication connection is established among the internal pole protection device, the line protection device and the pole control device in the same converter station.
The invention provides a fixed value setting and action matching method for multi-terminal direct-current line protection, wherein the fixed value method describes a line protection range and a setting principle under the condition of two-terminal and multi-terminal operation, and the fixed value method can solve the problem of multi-terminal direct-current line protection in the aspect of fixed value; the action matching method constructs a multi-terminal direct-current transmission system, and is a specific method for jointly matching with corresponding converter station bus differential protection, pole protection and line protection after the constructed system is subjected to value setting based on the multi-terminal direct-current line protection value setting method and a rectifier station receives a line fault restart command sent by a line protection device.
Drawings
Fig. 1 is a schematic structural diagram of a multi-terminal dc power transmission system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a converter station of a multi-terminal direct-current transmission system according to an embodiment of the present invention;
fig. 3A-3C are schematic diagrams of a first line protection constant value of a multi-terminal dc power transmission system according to an embodiment of the present invention;
fig. 4A-4B are schematic diagrams of second line protection constants for a multi-terminal dc power transmission system according to an embodiment of the present invention;
fig. 5 is a flowchart of an action coordination method of multi-terminal dc protection according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention is clearly and completely described below with reference to the drawings in the embodiments of the present invention.
The embodiment of the invention provides an action coordination method for multi-terminal direct-current line protection, which comprises the steps of constructing a multi-terminal direct-current power transmission system, carrying out value setting on the constructed system based on a determined multi-terminal direct-current line protection value setting method and carrying out corresponding operation after a rectifying station in the system receives a protection action signal.
The utility model provides a multiterminal direct current transmission system, this system includes M rectifier station and N contravariant station, wherein, M and N are the integer that is more than or equal to 1, and M + N is the integer that is more than or equal to 3, and different direct current circuit connect in the busbar, the busbar is located a certain converter station. The structure schematic diagram of the specific system is shown in fig. 1, wherein M is equal to 1, N is equal to 2, the system comprises a rectifying station a, an inverter station B and an inverter station C, the multi-terminal system line comprises a direct-current line 1 of the rectifying station a connected with the inverter station B, a direct-current line 2 of the inverter station B connected with the inverter station C, and the direct-current line 1 and the direct-current line 2 are connected with a bus bar. Each line is connected with the converter valve through the smoothing reactor. The bus bar is positioned in the station B of the inversion station. Fault F1 is located on line 1, fault F2 is located on line 2, fault 3 is located on the bus bar and fault 4 is located on the dc high voltage bus in the B station of the inverter station.
The structure schematic diagram of the converter station of the multi-terminal direct-current transmission system is shown in fig. 2, each converter station of the rectifier station a, the inverter station B and the inverter station C comprises three devices, namely a polar control device, a line protection device and a polar protection device, communication connection is established between every two polar control devices of different converter stations, and communication connection is established between every two line protection devices of different converter stations; and communication connection is established among the internal pole protection device, the line protection device and the pole control device in the same converter station.
A method for fixing the value of multi-terminal direct current line protection comprises a method for fixing the value of two-terminal operation and a method for fixing the value of multi-terminal operation, wherein: the method for operating the two ends is characterized in that a direct-current line protection area comprises a direct-current line between a current measuring point of a direct-current line of a current station and a smoothing reactor of a counter station and all equipment, and a fixed value setting principle is that valve side fault protection of the smoothing reactor of the adjacent converter station does not act; the multi-end operation fixed value method is characterized in that the direct current line protection under the operation mode of two ends of adjacent converter stations is reserved, and the direct current line protection under the operation mode of two ends of non-adjacent converter stations is quitted; and a section of traveling wave protection is added in the rectifier station, the protection range can be further extended to the next line, and the constant value setting principle is that the alternating current fault protection of the adjacent converter station does not act.
Fig. 3A to 3C are schematic diagrams of a first line protection constant value of a multi-terminal direct-current transmission system, where fig. 3A is a line protection range of a rectifier station a, fig. 3B is a line protection range of an inverter station B, and fig. 3C is a line protection range of an inverter station C.
As shown in fig. 3A, the protection range of the line protection of the rectifier station a is from the current measuring point IdL _ a of the line of the current station to the smoothing reactor of the inverter station B, the fixed value setting takes the principle that the valve side ground fault of the smoothing reactor of the inverter station B is not moved as the basic principle, the protection range of the additional traveling wave protection extends from the current measuring point IdL _ a of the line of the current station to the line 2, and the fixed value setting takes the principle that the valve side ground fault of the smoothing reactor of the inverter station C is not moved and the ac fault of the inverter station B is not moved as the basic principle.
As shown in fig. 3B, the inverter station B is configured with 2 sets of line protection and bus differential protection, the protection range of the first set of line is from the current measuring point IdL _ B1 of the line of the station to the smoothing reactor of the rectifier station a, and the fixed value setting takes the valve side ground fault of the smoothing reactor of the rectifier station a as the basic principle; the protection range of the second set of protection circuit is from a current measuring point IdL _ B2 of the circuit of the station to the smoothing reactor C of the inverter station, and the fixed value setting takes the valve side earth fault of the smoothing reactor C of the inverter station as a basic principle; the protection range of the bus bar differential protection is the bus bars and related connecting lines among the direct current line current measuring points IdL _ B1, IdL _ B2 and IdL _ B.
As shown in fig. 3C, the protection range of the inverter station C line protection is from the current measuring point IdL _ C of the local station line to the inverter station B smoothing reactor, and the fixed value setting takes the valve side ground fault of the inverter station B smoothing reactor as a basic principle.
A schematic diagram of a second line protection constant value of the multi-terminal direct-current transmission system is shown in fig. 4A-4B, wherein the inverter station B is withdrawn from operation, but the bus bar is not withdrawn; fig. 4A shows the line protection range of the rectifier station a after the inverter station B exits from operation; fig. 4B shows the line protection range of the inverter station C after the inverter station B exits from operation.
As shown in fig. 4A, the protection range of the line protection of the rectifier station a is switched from the current measuring point IdL _ a of the line of the current station to the smoothing reactor of the inverter station C, the fixed value setting takes the valve side ground fault of the smoothing reactor of the inverter station C as a basic principle, and the additional traveling wave protection exits; as shown in fig. 4B, the protection range of the line protection of the inverter station C is switched from the current measuring point IdL _ C of the line of the local station to the smoothing reactor a of the rectifier station a, and the fixed value setting takes the valve side ground fault of the smoothing reactor a of the rectifier station a as a basic principle; because the bus bar is still connected into the system, the line protection device of the inverter station B does not exit, and the pole protection and pole control device can exit; the differential protection range of the bus bar of the inverter station B is switched to the bus bar and the related connecting wires between the direct current line current measuring points IdL _ B1 and IdL _ B2; 2 sets of line protection of the inverter station B are still put into use, the protection range of the first set of protection line is from the line current measuring point IdL _ B1 of the inverter station B to the smoothing reactor of the rectifier station A, the fixed value setting takes the valve side ground fault of the smoothing reactor of the rectifier station A as the basic principle, the protection range of the second set of protection line is from the line current measuring point IdL _ B2 of the inverter station C to the smoothing reactor of the inverter station C, and the fixed value setting takes the valve side ground fault of the smoothing reactor of the inverter station C as the basic principle.
A method for coordinating actions of multi-terminal direct current line protection comprises the following specific operation methods:
when the rectifier station receives a line fault restart command transmitted by a direct current line protection device of the rectifier station or other stations, the converter valve of the rectifier station is controlled to forcibly shift the phase according to the line fault restart command;
during the phase shifting period of the rectifier station, if a bus bar differential protection action signal is received, an emergency shutdown command is issued, and all converter stations execute the emergency shutdown;
during the phase shifting of the rectifier station, if pole protection action signals of other converter stations are received, when the fault converter station is the only rectifier station or the only inverter station in operation of the system, a pole locking command is executed; if the fault converter station is not the only current rectifier station or the only current converter station, executing a restart command of the isolated fault converter station;
and during the phase shifting of the rectifier station, if signals of other converter station pole protection and bus protection actions are not received, after the dissociating time is waited to be removed, executing a valve restarting command and subsequent operations according to a line fault restarting strategy.
The following describes a specific operation flow with reference to the schematic structural diagram of the multi-terminal dc power transmission system shown in fig. 1 and the flowchart of the operation coordination method of the multi-terminal dc protection shown in fig. 5.
When the line 1 has a ground fault F1, the line protection of the rectifier station A acts, and the action outlet is a line fault restart command and transmits the line fault restart command to the rectifier station A pole control device; the pole control device A of the rectification station executes forced phase shifting of the converter valve of the rectification station according to the command; during the phase shift period of the rectifier station A, an action signal of the first set of line protection of the inverter station B is received, but no bus differential protection and pole protection action signal exists, so that after the free time is removed, a restart command and subsequent operation are executed according to a line fault restart strategy.
When a line 2 has a ground fault F2, a traveling wave protection action is added to the rectifier station A, or a second set of line protection action of the inverter station B is transmitted to the rectifier station A for line protection through inter-station communication, and a line protection action outlet is a line fault restart command and is transmitted to a pole control device of the rectifier station A; the pole control device A of the rectification station executes forced phase shifting of the converter valve of the rectification station according to the command; during the phase shift period of the rectifier station A, no bus differential protection and pole protection action signals exist, so that after the trip time is waited, a restart command and subsequent operations are executed according to a line fault restart strategy.
When the bus bar has a ground fault F3, the line protection of the rectifier station A acts, and the action outlet is a line fault restart command and is transmitted to the pole control device of the rectifier station A; the pole control device A of the rectification station executes forced phase shifting of the converter valve of the rectification station according to the command; during the phase shifting period of the rectifier station A, an action signal of differential protection of a bus bar of the inverter station B is received, an electrode emergency shutdown command is issued, and all converter stations execute electrode shutdown.
When a direct-current high-voltage bus in the station B of the inverter station has a ground fault F4, the line protection or additional traveling wave protection of the rectifier station A can possibly act, and a protection action outlet is a line fault restart command and transmits the line fault restart command to the pole control device of the rectifier station A; the pole control device A of the rectification station executes forced phase shifting of the converter valve of the rectification station according to the command; and during the phase shifting period of the rectifier station A, receiving a B pole protection action signal of the inverter station, and executing a restart command again when the inverter station B is not the only inverter station in operation.
The invention provides a constant value and an operation method for multi-terminal direct current line protection, wherein the constant value method describes a line protection range and a setting principle under the condition of two-terminal and multi-terminal operation, and the constant value method can solve the difficult problem of multi-terminal direct current line protection in the aspect of constant value; the operation method constructs a multi-terminal direct-current transmission system, and the method specifically comprises the steps of carrying out value setting on the constructed system based on the multi-terminal direct-current line protection value setting method, and cooperating with corresponding converter station bus differential protection, pole protection and line protection after a rectification station receives a line fault restart command sent by a line protection device.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that changes may be made without departing from the scope of the invention, and it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
Claims (4)
1. A constant value setting method for multi-terminal direct-current line protection is characterized by comprising a two-terminal operation constant value setting method and a multi-terminal operation constant value setting method, wherein:
the multi-end operation fixed value setting method is characterized in that the direct current line protection under the operation mode of two ends of adjacent converter stations is reserved, and the direct current line protection under the operation mode of two ends of non-adjacent converter stations is quitted; and a section of traveling wave protection is added in the rectifying station, the protection range is further extended to the next line, and the fixed value setting principle is that the alternating current fault protection of the adjacent converter station does not act.
2. An action coordination method for multi-terminal direct current line protection is characterized by comprising the following steps: the method comprises the following steps of constructing a multi-terminal direct-current power transmission system, carrying out value setting on the constructed system based on the multi-terminal direct-current line protection value setting method claimed in claim 1, and carrying out corresponding operation after a rectifying station in the system receives a protection action signal, wherein the specific operation method comprises the following steps:
when the rectifier station receives a line fault restart command transmitted by a direct current line protection device of the rectifier station or other stations, the converter valve of the rectifier station is controlled to forcibly shift the phase according to the line fault restart command;
during the phase shifting period of the rectifier station, if a bus bar differential protection action signal is received, an emergency shutdown command is issued, and all converter stations execute the emergency shutdown;
during the phase shifting of the rectifier station, if pole protection action signals of other converter stations are received, when the fault converter station is the only rectifier station or the only inverter station in operation of the system, a pole locking command is executed; if the fault converter station is not the only current rectifier station or the only current converter station, executing a restart command of the isolated fault converter station;
and during the phase shifting of the rectifier station, if signals of other converter station pole protection and bus protection actions are not received, after the dissociating time is waited to be removed, executing a valve restarting command and subsequent operations according to a line fault restarting strategy.
3. The method of coordinating actions of multi-terminal dc line protection according to claim 2, wherein the multi-terminal dc power transmission system comprises: m rectifier stations and N inverter stations, wherein M and N are integers more than or equal to 1, M + N is an integer more than or equal to 3, different direct current lines are connected to a bus bar, and the bus bar is located in one converter station.
4. The method for action coordination of multi-terminal direct current line protection according to claim 2, wherein the converter station includes a pole control device, a line protection device and a pole protection device, wherein the pole control devices of different converter stations establish communication connection with each other, and the line protection devices of different converter stations establish communication connection with each other; and communication connection is established among the internal pole protection device, the line protection device and the pole control device in the same converter station.
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| CN110556802B (en) * | 2019-09-25 | 2021-05-28 | 南京南瑞继保电气有限公司 | Converter fault protection method for multi-converter direct-current transmission system |
| CN110783902B (en) * | 2019-10-22 | 2021-07-30 | 南方电网科学研究院有限责任公司 | Line fault detection method, device and medium for multi-terminal direct current transmission system |
| CN111200278B (en) * | 2020-02-24 | 2020-12-01 | 中国南方电网有限责任公司超高压输电公司昆明局 | High-speed grounding switch anti-tripping protection method in direct-current system metal loop operation mode |
| CN112448373B (en) * | 2020-10-30 | 2023-05-16 | 中国南方电网有限责任公司超高压输电公司 | Method for realizing metal lateral difference protection of parallel multi-terminal direct current transmission system |
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