Cross-voltage-class substation domain protection method and device and substation control system

Abstract

The invention discloses a cross-voltage-class substation domain protection method and device and a substation control system, and belongs to the technical field of power system relay protection. The substation domain protection method comprises the steps that if sampling value information of a current substation domain protection device is abnormal or equipment alarm information exists, the substation domain protection device is started; if yes, a protection abnormal signal is sent to other station domain protection devices at different voltage levels in the same transformer substation through the in-station channel; if channel information detected by other station domain protection devices in real time is abnormal or a protection abnormal signal from the current station domain protection device is received, inputting first station domain backup protection and second station domain backup protection of which the directions point to a bus of a corresponding voltage level of the current station domain protection device; that is, when the main protection fails due to the abnormity of the protection system, the cross-voltage-level protection is carried out by introducing multi-source information, so that the operation safety of the station domain protection can be remarkably improved and enhanced, and the purpose of rapidly and accurately removing the fault can be achieved when the protection system is abnormal due to various different conditions.

Description

Technical Field

[0001] The present invention belongs to the technical field of relay protection of electric power systems, and more specifically, relates to a cross-voltage level station protection method, device and substation control system. Background Art

[0002] Substations are places in power systems that transform voltage and current, receive and distribute electric energy. As an important part of the first line of defense of substations, the performance of relay protection is of great significance to the safe and stable operation of the entire power grid. In a complex operating environment, the relay protection equipment itself and the information sampling and transmission process may be affected by various internal and external factors, resulting in abnormal protection information, which in turn threatens the stable operation of the entire power system.

[0003] When the protection system fails due to an abnormality and the main protection fails, the existing backup protection scheme relies solely on local protection information and is unable to quickly and accurately identify the fault and then remove the fault, resulting in reduced reliability of relay protection. Summary of the invention

[0004] In response to the above defects or improvement needs of the prior art, the present invention provides a station domain protection method, device and substation control system across voltage levels, which aims to solve the technical problem that when the protection system anomaly causes the main protection to fail, the existing backup protection scheme is difficult to quickly and accurately identify the fault and then perform fault removal.

[0005] To achieve the above object, according to one aspect of the present invention, a cross-voltage level station domain protection method is provided, comprising: S1: Determine in real time whether the sampling value information of the current station protection device at the corresponding voltage level is abnormal and whether there is equipment alarm information; S2: If the sampling value information is abnormal or the device alarm information exists, a protection abnormality signal is sent to other station protection devices at different voltage levels in the same substation through the station channel of the station; S3: If the channel information detected in real time by the other station area protection device is abnormal or receives a protection abnormality signal from the current station area protection device, the other station area protection device is put into operation in the direction of the first station area backup protection and the second station area backup protection of the busbar corresponding to the voltage level of the current station area protection device; S4: Control the first station area backup protection and the second station area backup protection to perform corresponding actions to cut off the fault at the voltage level corresponding to the current station area protection device.

[0006] In one embodiment, determining in real time whether the sampling value information of the current station area protection device is normal includes: If the sampling value information of each electrical component under the voltage level corresponding to the current station domain protection device cannot be detected, or if the sampling value information of any electrical component under the voltage level corresponding to the current station domain protection device is detected to be abnormal, the information abnormality timer in the current station domain protection device is increased by a sampling interval time, and if the accumulated sampling interval time on the information abnormality timer corresponding to the current station domain protection device reaches the preset delay time, the information abnormality flag position is set to 1 to indicate that the sampling value information is abnormal; Otherwise, the information abnormality flag is set to 0 to indicate that the sampling value information is normal.

[0007] In one embodiment, there are multiple other site area protection devices, and the multiple other site area protection devices are distributed at different voltage levels.

[0008] In one of the embodiments, the first station area backup protection is: distance protection; the distance protection includes: the protection range is extended to other voltage level buses and the protection delay is coordinated with the next voltage level close backup protection.

[0009] In one of the embodiments, the second station area backup protection is directional protection, and the directional protection includes extending the protection range to the outgoing line ends of other voltage levels and coordinating the protection delay of the second station area backup protection with the next voltage level near backup protection.

[0010] According to another aspect of the present invention, there is provided a cross-voltage level station protection device, comprising: A judgment module is used to judge in real time whether the sampling value information of the current station protection device corresponding to the voltage level is abnormal and whether there is equipment alarm information; A sending module, used for sending a protection abnormality signal to other station protection devices at different voltage levels in the same substation through the station channel of the station if the sampling value information is abnormal or the equipment alarm information exists; A setting module is used for, if the channel information detected in real time by the other station area protection devices is abnormal or a protection abnormality signal is received from the current station area protection device, the other station area protection devices are put into operation in a direction pointing to the first station area backup protection and the second station area backup protection of the busbar corresponding to the voltage level of the current station area protection device; The cutting module is used to control the first station area backup protection and the second station area backup protection to perform corresponding actions to cut off the fault at the corresponding voltage level of the current station area protection device.

[0011] According to another aspect of the present invention, there is provided a substation control system, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the cross-voltage level station domain protection method when executing the computer program.

[0012] According to another aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the station domain protection method across voltage levels are implemented.

[0013] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art: (1) The present invention provides a station area protection method across voltage levels. If the sampling value information is abnormal or the equipment alarm information exists, a protection abnormality signal is sent to other station area protection devices at different voltage levels in the same substation through the station channel of the station; if the channel information detected in real time by the other station area protection devices is abnormal or a protection abnormality signal is received from the current station area protection device, the other station area protection devices are put into operation in the direction of the first station area backup protection and the second station area backup protection of the busbar corresponding to the voltage level of the current station area protection device; that is, when the protection system is abnormal and causes the main protection to fail, cross-voltage level protection is performed by introducing multi-source information, which can significantly improve and enhance the operational safety of the station area protection. When facing various different situations that cause the protection system to be abnormal, the first station area backup protection and the second station area backup protection are controlled to perform corresponding actions, so as to achieve the purpose of quickly and accurately removing the fault.

[0014] (2) In this scheme, if the accumulated sampling interval time on the information anomaly timer corresponding to the current station domain protection device reaches the preset delay time, the information anomaly flag position is set to 1; compared with the existing anomaly identification method, the accumulated sampling interval time on the information anomaly timer is more accurate.

[0015] (3) There are multiple other station area protection devices in this scheme, and the multiple other station area protection devices are distributed at different voltage levels. Considering that the multiple other station area protection devices are distributed at different voltage levels, mutual protection of multiple voltage levels in the same substation can be achieved, thereby improving the reliability of protection.

[0016] (4) In this scheme, the first station area backup protection is distance protection; this method can meet the requirements of rapid and selective fault removal in a complex network across voltage levels.

[0017] (5) The second station area backup protection in this scheme is directional protection, which can realize the remote backup protection function of this voltage level protection for electrical components of different voltage levels, ensuring the sensitivity of the protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of a cross-voltage level station domain protection method provided by an embodiment of the present invention.

[0019] Figure 2 It is a schematic diagram of the application of the backup protection system of the station-wide protection method applicable to cross-voltage levels provided by an embodiment of the present invention in a 220kV substation.

[0020] Figure 3 It is a structural schematic diagram of a cross-voltage level station protection device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] According to one aspect of the present invention, a cross-voltage level station domain protection method is provided, such as Figure 1 As shown, it includes: S1: judging in real time whether the sampling value information of the current station area protection device at the corresponding voltage level is abnormal and whether there is equipment alarm information; S2: if the sampling value information is abnormal or the equipment alarm information is present, a protection abnormality signal is sent to other station area protection devices at different voltage levels in the same substation through the station channel of this station; S3: if the channel information detected in real time by other station area protection devices is abnormal or a protection abnormality signal is received from the current station area protection device, the other station area protection devices are put into operation in the direction of the first station area backup protection and the second station area backup protection of the busbar of the voltage level corresponding to the current station area protection device; S4: controlling the first station area backup protection and the second station area backup protection to perform corresponding actions to cut off the fault at the corresponding voltage level of the current station area protection device.

[0023] For example, (1) the current station protection device at the 110kV bus detects the sampling value information of the electrical components in the station corresponding to the voltage level of the current station protection device. If the sampling value information of the current transformer corresponding to the voltage level of the current station protection device of this station cannot be detected, the current station protection device will increase the information abnormality timer by a sampling interval time.

[0024] (2) After a period of time, the information anomaly timer of the current station area protection device reaches the information anomaly timer delay, and the information anomaly flag is set to 1. The current station area protection device detects the alarm information of the voltage level equipment corresponding to the current station area protection device of the station, and fails to detect the alarm information of the voltage level equipment corresponding to the current station area protection device of the station, and the alarm flag of the equipment in the station remains at 0.

[0025] (3) If the current station protection device determines that the information abnormality flag bit and the information abnormality flag bit in the station equipment alarm flag bit are 1, the current station protection device sends a protection abnormality signal to other station protection devices on the 220 kV side of the station through the station channel; (4) Other station area protection devices receive the protection abnormality signal sent by the current station area protection device of the station, and the protection abnormality flag position of other station area protection devices on the 220 kV side is 1; (5) If other site area protection devices detect that the optical fiber channel between them and the current site area protection device is normal, the other site area protection devices will maintain the channel abnormality flag of other site area protection devices as 0; conversely, if other site area protection devices determine that the channel abnormality flag is 1; (6) If the protection abnormality flag and channel abnormality flag corresponding to other station area protection devices on the 220kV side are both 1, the direction of operation of other station area protection devices on the 220kV side is: pointing to the first station area backup protection and the second station area backup protection of the current station area protection device on the 110kV side.

[0026] (7) The first station area backup protection and the second station area backup protection operate correctly and the fault at F2 is cleared.

[0027] Furthermore, there are multiple other station area protection devices, and the multiple other station area protection devices are distributed at different voltage levels.

[0028] Furthermore, the first station area backup protection is: distance protection; the distance protection includes: the protection range is extended to other voltage level busbars and the protection delay is coordinated with the next voltage level close backup protection.

[0029] Furthermore, the second station area backup protection is directional protection, which includes extending the protection range to the outgoing line ends of other voltage levels and coordinating the protection delay of the second station area backup protection with the next voltage level near backup protection.

[0030] According to another aspect of the present invention, Figure 3As shown, a station area protection device across voltage levels is provided, including: a judgment module, a sending module, a setting module and a cutting module; the judgment module is used to judge in real time whether the sampling value information at the voltage level corresponding to the current station area protection device is abnormal and whether the equipment alarm information exists; the sending module is used to send a protection abnormality signal to other station area protection devices at different voltage levels in the same substation through the station channel of this station if there is an abnormality in the sampling value information or the equipment alarm information exists; the setting module is used to, if the channel information detected in real time by other station area protection devices is abnormal or the protection abnormality signal is received from the current station area protection device, the other station area protection devices are put into operation in the direction of the first station area backup protection and the second station area backup protection of the busbar corresponding to the voltage level of the current station area protection device; the cutting module is used to control the first station area backup protection and the second station area backup protection to perform corresponding actions to cut off the fault at the voltage level corresponding to the current station area protection device.

[0031] According to another aspect of the present invention, a substation control system is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of a cross-voltage level station protection method when executing the computer program.

[0032] According to another aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, steps of a station domain protection method across voltage levels are implemented.

[0033] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cross-voltage level station protection method, characterized in that: include: S1: Determine in real time whether the sampling value information of the current station protection device at the corresponding voltage level is abnormal and whether there is equipment alarm information; S2: If the sampling value information is abnormal or the device alarm information exists, a protection abnormality signal is sent to other station protection devices at different voltage levels in the same substation through the station channel of the station; S3: If the channel information detected in real time by the other station area protection device is abnormal or receives a protection abnormality signal from the current station area protection device, the other station area protection device is put into operation in the direction of the first station area backup protection and the second station area backup protection of the busbar corresponding to the voltage level of the current station area protection device; S4: Control the first station area backup protection and the second station area backup protection to perform corresponding actions to cut off the fault at the voltage level corresponding to the current station area protection device.

2. The cross-voltage level station domain protection method according to claim 1, characterized in that: Determining in real time whether the sampling value information of the current station area protection device is normal includes: If the sampling value information of each electrical component under the voltage level corresponding to the current station domain protection device cannot be detected, or if the sampling value information of any electrical component under the voltage level corresponding to the current station domain protection device is detected to be abnormal, the information abnormality timer in the current station domain protection device is increased by a sampling interval time, and if the accumulated sampling interval time on the information abnormality timer corresponding to the current station domain protection device reaches the preset delay time, the information abnormality flag position is set to 1 to indicate that the sampling value information is abnormal; Otherwise, the information abnormality flag is set to 0 to indicate that the sampling value information is normal.

3. The cross-voltage level station domain protection method according to claim 1, characterized in that: There are multiple other station area protection devices, and the multiple other station area protection devices are distributed at different voltage levels.

4. The cross-voltage level station domain protection method according to claim 1, characterized in that: The first station area backup protection is: distance protection; The distance protection includes: the protection range is extended to busbars of other voltage levels and the protection delay is coordinated with the next voltage level close backup protection.

5. The cross-voltage level station domain protection method according to claim 4, characterized in that: The second station area backup protection is directional protection, which includes extending the protection range to the outgoing line ends of other voltage levels and coordinating the second station area backup protection action protection delay with the next voltage level near backup protection.

6. A cross-voltage level station protection device, characterized in that: include: A judgment module is used to judge in real time whether the sampling value information of the current station protection device corresponding to the voltage level is abnormal and whether there is equipment alarm information; A sending module, used for sending a protection abnormality signal to other station protection devices at different voltage levels in the same substation through the station channel of the station if the sampling value information is abnormal or the equipment alarm information exists; A setting module is used for, if the channel information detected in real time by the other station area protection devices is abnormal or a protection abnormality signal is received from the current station area protection device, the other station area protection devices are put into operation in a direction pointing to the first station area backup protection and the second station area backup protection of the busbar corresponding to the voltage level of the current station area protection device; The cutting module is used to control the first station area backup protection and the second station area backup protection to perform corresponding actions to cut off the fault at the corresponding voltage level of the current station area protection device.

7. A substation control system, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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