A low-voltage control method for rural power grid

Abstract

A low-voltage control method for rural power grids. Rural power grids are equipped with four-level control equipment from substations to low-voltage lines supplied to users, which are the first-level on-load voltage regulation and substation centralized compensation devices for regulating substations. The second-stage multi-stage line reactive power compensation device for medium-voltage lines, the third-stage on-load tap-changing transformer for regulating and controlling distribution stations, and the fourth-stage low-voltage reactive power compensation device for regulating and controlling low-voltage lines; There is a low-voltage monitor, and the low-voltage monitor and each level of control equipment are connected to the control and management master station through the network or wireless communication. In the present invention, when the low-voltage monitor detects that the low voltage somewhere in the line is abnormal, the regulation and management master station regulates the equipment closest to the place where the voltage occurs in the order from the last stage of the line to the high-level voltage, and the adjusted voltage value is transmitted to the regulation and management In the master station, compare the reference value of the voltage data in it, and if it meets the standard, start monitoring again; otherwise, the line alarms.

Description

technical field [0001] The invention relates to the field of low-voltage control of rural power grids, in particular to a low-voltage control method for rural power grids. Background technique [0002] At present, my country's economy is in a transitional stage, and the rapid growth of rural electricity demand has led to insufficient supply capacity and reduced voltage quality in some rural power grids. According to the statistics of the Ministry of Agriculture and Electricity, 36.4% of distribution transformers with "low voltage" exist in the country at present, and the "low voltage" problem of individual rural users is more prominent. After actual investigation, the domestic low-voltage control has shown problems such as unreasonable selection of voltage control equipment, imperfect voltage control strategy, and ineffective effects in practical applications. For example, in the national patent with the publication number CN102904268A "a three-stage joint debugging reactiv...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem that the existing rural power grid system is difficult to solve the problem of voltage quality degradation, provide a low voltage management method for rural power grids, and solve the defect of low voltage qualification rate caused by the low voltage problem of rural power grids

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