AC-DC system, decoupling method thereof and protection equipment
An AC-DC system and decoupling technology, applied in the field of AC-DC interconnection system protection, can solve the problems of mutual influence of ground faults in AC and DC areas, inability to accurately reflect the fault type, and inability to determine the fault area.
Active Publication Date: 2019-05-17
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] Such as 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 p...
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The invention provides an AC-DC system, a decoupling method thereof and protection equipment. The decoupling method comprises the steps of acquiring an AC voltage of an AC side of a converter; acquiring a fundamental component of a three-phase voltage and a DC component of the three-phase voltage; and performing voltage protection of the AC-DC system according to a relation among a fundamental wave effective value of the three-phase voltage, the DC component of the three-phase voltage and a corresponding protection action threshold. According to the decoupling method provided by the scheme, overvoltage protection is executed according to the fundamental wave component of the three-phase voltage acquired according to the AC voltage of the AC side of the converter and the DC component of thethree-phase voltage, voltage protection is executed by a positive DC voltage fundamental component, negative DC voltage fundamental component, positive DC voltage DC component and negative DC voltageDC component which are acquired according to a DC voltage of the DC side of the converter, so that strong coupling between AC-DC interconnection systems which are not connected by an isolation transformer is removed.
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