A voltage sag mitigation method for sensitive loads based on a fault current limiter

Abstract

The invention discloses a fault current limiter-based sensitive load voltage sag alleviation method. The method comprises the steps of 1, selecting a sensitive load and determining a voltage sag threshold: selecting the sensitive load required to be subjected to voltage sag alleviation from a power grid, and determining the voltage sag threshold of the sensitive load; 2, obtaining a busbar voltage sag matrix of a sensitive load access point; 3, obtaining a sensitive load voltage sag field matrix; 4, obtaining a sensitive load voltage sag field; 5, determining a fault current limiter mounting branch; 6, determining a fault current limiter reactance value of the fault current limiter mounting branch; and 7, comparing fault current limiter mounting schemes and obtaining a sensitive load voltage sag alleviation scheme. The method is simple in step, reasonable in design, convenient to implement and good in use effect; and the purpose of effectively alleviating voltage sag of the sensitive load in the power grid based on the fault current limiter is achieved by determining the fault current limiter mounting branch and the fault current limiter reactance value in the power grid.

Description

technical field [0001] The invention belongs to the technical field of grid voltage control, and in particular relates to a method for alleviating voltage sags of sensitive loads based on a fault current limiter. Background technique [0002] In recent years, with the increasing use of power electronic equipment, power loads have become more and more sensitive to voltage sags, and voltage sags have become one of the most frequently complained power quality problems by users. The economic losses caused by sensitive loads in the power grid affected by voltage sags are even more immeasurable. After analysis, the short-circuit fault is the main cause of the voltage sag, how to alleviate the impact and harm of the sensitive load caused by the voltage sag has important practical significance. The fault current limiter can alleviate the voltage sag while limiting the short-circuit current. Therefore, the installation position and parameter determination of the fault current limite...

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Problems solved by technology

Liu Kai, Chen Hongkun, Lin Jun published the paper "Research Status of Fault Current Limiter in Power System", Jin Qingren, Chen Hongkun and Yang Zhiping published the paper "Summary of Fault Current Limiter Installation Position in Power System" and Hong Jianshan, Guan Yonggang In the literature "Selection of Installation Location and Parameter Calculation of Fault Current Limiter in Large Power Grid" published by Xu Guozheng, both discussed the installation location of fault current limiter, but did not discuss it in conjunction with the control of voltage sag, and did not give Make a specific installation plan and determine the parameters of the plan

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