Fault detection method and system for smart distribution network oriented to protected component model
A technology of intelligent distribution network and component model, which is applied in the direction of detecting faults according to conductor types, fault locations, information technology support systems, etc., can solve problems such as the inability to correctly judge the fault direction, and achieve good reliability and adaptability
Active Publication Date: 2019-12-27
SHANDONG UNIV
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However, this directional element can only be applied to transmission lines with unidirectional power flow. For distribution lines with distributed power sources, since the access position and output of distributed power sources are not fixed, the power flow distribution will often change, resulting in this The direction element cannot correctly judge the fault direction
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[0040] The present invention will be further described below in conjunction with accompanying drawing.
[0041] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.
[0042] As introduced in the background technology, in order to solve the technical problems in the background technology, this application proposes a fault detection method for intelligent distribution network oriented to the protected component model, including the following steps:
[0043] (1) Obtain the measured voltage U at the installation place of...
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The invention discloses a protected element model-based intelligent power distribution network fault detection method and system. The method includes the steps of obtaining a measuring voltage and a measuring current in a direction element installation position after an intelligent power distribution network malfunctions; setting the amplitude and phase of set impedance and calculating a working voltage; conducting phase comparison on the working voltage and the measuring voltage; and carrying out pilot comparison on protection judgment results in all positions to determine fault positions. The beneficial effects are that the fault detection and judgment method provided by the invention is basically not affected by DG fault characteristics, and a fault occurring section can be judged accurately by conducting area pilot comparison on a logic result (whether a protected object model is in good condition); and good reliability and sensitivity can be guaranteed under special operating conditions such as reactive power compensation equipment retreat or changes of line equivalent impedance properties caused by DG special control strategies.
Description
technical field [0001] The invention relates to the field of electric power system relay protection, in particular to an intelligent distribution network fault detection method and system based on working voltage phase comparison oriented to the protected element model. Background technique [0002] The smart distribution network contains DGs or microgrids of various types and capacities. DG access not only changes the basic characteristics of the radial structure of the traditional distribution network, but also brings many impacts on the operation and control of the distribution network, especially the impact on the traditional relay protection devices. When the existing overcurrent protection principle and configuration of the smart distribution network cannot meet the operational requirements, most current differential protection principles and devices are used. However, the current differential protection has problems such as multi-terminal synchronous sampling, insuff...
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IPC IPC(8): G01R31/08G01R25/00G01R25/02
CPCG01R25/005G01R25/02G01R31/086Y04S10/52
Inventor 丛伟张子衿康奇豹尹丰钊盛亚如孙梦晨张丽强胡亮亮潘博中柴庆发
Owner SHANDONG UNIV