Differential protection method and system for in-station elements in transformer substation
A substation, component technology
Active Publication Date: 2020-04-03
STATE GRID CORP OF CHINA +1
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Problems solved by technology
However, in the prior art, the method of using multiple agents to realize the backup protection of components in the substation still adopts the centralized protection mode, and the differential backup of the whole station is carried out based on the topology structure. The information is centralized and the amount of calculation is large. serious consequences
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[0036] The present invention will be described in detail below in conjunction with the accompanying drawings. However, it should be understood that the accompanying drawings are provided only for better understanding of the present invention, and they should not be construed as limiting the present invention.
[0037] Such as figure 1 As shown, the substation component differential protection method provided by the present invention includes the following steps:
[0038] 1) According to the distribution of components in each substation and protection measures, build the Agent system of the substation, including the Agent corresponding to the components in each substation. The Agent system is a distributed parallel architecture, specifically:
[0039] Such as figure 2 As shown, the Agents corresponding to the components in each substation are established respectively, and the Agents communicate with each other through the process bus of the substation to form an Agent system...
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The invention relates to a differential protection method and system for in-station elements in a transformer substation, and the method is characterized in that the method comprises the following steps: 1) Agents corresponding to in-station elements of a transformer substation are respectively built, and an Agent system is formed; 2) a corresponding main protection area and a backup protection area for each Agent are established; (3) each Agent collects current signals on lines connected with in-station elements in the corresponding main protection area and the backup protection area; 4) eachAgent adopts a differential algorithm A to judge whether a fault occurs in the corresponding backup protection area or not; 5) each Agent adopts a differential algorithm A to judge whether a fault occurs in the corresponding main protection area or not; (6) if the backup protection area breaks down and the main protection area does not break down, the Agent sends a tripping decision signal to a line connected with an in-station element in the main protection area; and (7) each Agent adopts a differential algorithm B to judge whether the connected line is tripped off or not, so differential protection of elements in the transformer substation is completed. The method can be widely applied to the technical field of power grid protection.
Description
technical field [0001] The invention relates to a method and system for differential protection of substation components, and belongs to the technical field of power grid protection. Background technique [0002] Substation is a key connection point in the power system, which plays a vital role in the safety of power grid operation and the reliability of power supply. Substations are equipped with corresponding protections for different components. Generally, differential protection is used as the main protection for transformers and busbars. The complex voltage overcurrent element on the high voltage side of the transformer acts as a near-backup protection for internal faults in the transformer, and the overcurrent element on the medium and low voltage side acts as a near backup or protection for the busbar. Far backup protection. With the increasingly complex grid structure, changes in power flow and fault characteristics also have a certain impact on component protection...
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IPC IPC(8): H02H7/26
CPCH02H7/262
Inventor 王紫琪刘颖肖智宏
Owner STATE GRID CORP OF CHINA