An AC/DC system, its decoupling method, and protection device
A decoupling technology for AC and DC systems, applied in the protection field of AC and DC interconnection systems, can solve the problems of mutual influence of grounding faults in AC and DC areas, inability to accurately reflect fault types, and inability to determine fault areas, etc.
Active Publication Date: 2021-02-09
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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Problems solved by technology
[0004] The purpose of the present invention is to provide an AC-DC system and its decoupling method and protection equipment to solve the strong coupling between the AC-DC interconnection systems not connected by the isolation transformer; the ground faults in the AC and DC areas affect each other, resulting in The fault features in the AC and DC areas are rich and cannot accurately reflect a single fault type, and the protection actions in the AC and DC areas cannot determine the fault area
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[0033] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.
[0034] The present invention aims at the strong coupling between the existing AC and DC interconnection systems not connected by the isolation transformer; the grounding faults in the AC and DC areas affect each other, resulting in rich fault features in the AC area and the DC area, which cannot accurately reflect a single fault type, The protection action in the AC area and the DC area cannot determine the problem of the fault area, and a decoupling method for the AC and DC systems is provided.
[0035] like figure 1 As shown, the above methods include:
[0036] Step S1: Obtain the AC voltage on the AC side of the converter;
[0037] Step S2: Obtain the fundamental component of the three-phase phase voltage and the DC component of the three-phase phas...
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The present invention provides an AC-DC system and its decoupling method and protection equipment. The decoupling method includes: obtaining the AC voltage on the AC side of the converter; obtaining the fundamental wave component of the three-phase phase voltage and the three-phase phase voltage according to the AC voltage the DC component. According to the relationship between the fundamental effective value of the three-phase phase voltage, the DC component of the three-phase phase voltage and the corresponding protection action threshold value, the voltage protection of the AC-DC system is carried out. In the solution of the present invention, the overvoltage protection is performed according to the fundamental component of the three-phase phase voltage and the DC component of the three-phase phase voltage obtained from the AC voltage on the AC side of the converter; the positive DC voltage is obtained according to the DC voltage on the DC side of the converter. Voltage fundamental component, negative DC voltage fundamental component, positive DC voltage DC component, and negative DC voltage DC component perform voltage protection; thereby realizing the release of strong coupling between AC and DC interconnection systems not connected by isolation transformers.
Description
technical field [0001] The invention relates to the technical field of AC-DC interconnection system protection, in particular to an AC-DC system, a decoupling method thereof, and a protection device. Background technique [0002] Coupling refers to the phenomenon that there is close cooperation and mutual influence between the input and output of two or more circuit elements or electrical networks, and the phenomenon of transferring energy from one side to the other through interaction. [0003] In the prior art, there is strong coupling between the AC and DC interconnection systems not connected by isolation transformers; the ground faults in the AC and DC areas affect each other, resulting in rich fault characteristics in the AC and DC areas, which cannot accurately reflect a single fault type. The protection actions in the DC zone and the DC zone cannot determine the fault zone. Contents of the invention [0004] The purpose of the present invention is to provide an AC...
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IPC IPC(8): H02J5/00H02H7/26
Inventor 葛俊邓占锋赵国亮祁欢欢陆振纲于弘洋蔡林海刘海军
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD