Control method for low-voltage intelligent capacitors of multi-step distribution network

Abstract

The invention discloses a control method for low-voltage intelligent capacitors of a multi-step distribution network. The control method comprises the following steps: (1) measuring a power factor at the head end of a 10kV feeder line, (2) dividing the power factor obtained according to measurement into a segment of power factor lagging below 0.98, a segment of power factor lagging 0.98-1and a segment of power factor lead, (3) allowing the segment of power factor lagging below 0.98, the segment of power factor lagging 0.98-1 and the segment of power factor lead of the head end of the feeder line to correspond to actions of all the low-voltage intelligent capacitors respectively when compensation point voltage fails to be out of limit, (4) measuring and calculating the distribution transformation load rate of a reactive power compensation installation point through a current transformer on a distribution transformation low-voltage side, and (5) obtaining the variation amount of the reactive power compensation point load rate according to two times of measurement and comparison, determining the priority of switching and performing switching control over all the low-voltage intelligent capacitors on the premise that the compensation point voltage fails to be out of limit. According to the control method, the reactive power compensation potentialities of the distribution network can be better developed, reactive power in-place balance is better achieved, and therefore the purposes of saving energy and lowering consumption are achieved.

Description

technical field [0001] The invention relates to a method for controlling a capacitor on the low-voltage side of a 10kV line distribution transformer, in particular to a method for controlling a low-voltage intelligent capacitor in a stepped distribution network, and belongs to the technical field of capacitor control. Background technique [0002] With the development of the economy and the progress of the society, the power load has been increasing rapidly in recent years, especially the inductive load such as electric motors. Therefore, most provinces in China have experienced power shortages. In addition, the unreasonable wire diameter and complex structure of my country's power grid planning, the excessively long power supply lines in rural areas, and the excessively concentrated load in urban areas have all caused serious losses in the transmission process of my country's electric energy supply. If it can be further reduced Loss during transportation, which can undoubted...

AI Technical Summary

Problems solved by technology

At the same time, this also liberates the traditional and conservative capacitor switching control strategy. Because of the fear that reactive power will be fed back to the upper grid, in the traditional switching control strategy, the power factor of the capacitor at the reactive power compensation point is controlled in a lagging state. , and does not allow forward feed to the line

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