Operation method and system of low-voltage reactive compensation series-parallel system

Abstract

The invention provides an operation method of a low-voltage reactive compensation series-parallel system. Each intelligent capacitor communicates with the SVG. The method comprises: the intelligent capacitor sending own state information to the SVG, the SVG knowing the switching condition of each intelligent capacitor according to the sent state information; the SVG collecting a current signal inreal time through an external CT, sending the sine wave waveform representing the current signal to the signal conditioning circuit; acquiring a current waveform sent by an SVG, sending the current waveform to a control unit of the SVG, comparing the acquired current waveform with a compensation current waveform sent by the SVG by the control unit, and calculating effective values of two waveformcurrents by using a DFT algorithm, the difference between the two current effective values being the reactive current required to be compensated by a capacitor; an input process: after receiving the command, inputting; in a cutting process, cutting off after receiving the command. The method has the advantages that the compensation economy and effectiveness are improved. The invention further provides a novel low-voltage reactive compensation series-parallel system for operating the operation method.

Description

technical field [0001] The invention relates to the technical field of reactive power compensation, in particular to an operation method and system of a low-voltage reactive power compensation hybrid system. Background technique [0002] In the current voltage distribution system, due to the increasingly higher requirements for the power system, the existing reactive power compensation device can no longer meet the higher requirements of the power system. Therefore, the static var generator (hereinafter referred to as SVG) and Active Power Filter (hereinafter referred to as APF) has been widely used. However, due to the high cost of SVG and APF, general power distribution rooms will not use them in large quantities. Therefore, how to combine SVG / APF with existing compensation devices, It is an important research direction in this field to make compensation more economical and effective through centralized control. [0003] In view of the above problems, the applicant aims t...

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Problems solved by technology

[0002] In the current voltage distribution system, due to the increasingly higher requirements for the power system, the existing reactive power compensation device can no longer meet the higher requirements of the power system. Therefore, the static var generator (hereinafter referred to as SVG) and Active Power Filter (hereinafter referred to as APF) has been widely used. However, due to the high cost of SVG and APF, general power distribution rooms will not use them in large quantities. Therefore, how to combine SVG / APF with existing compensation devices, It is an important research direction in this field to make compensation more economical and effective through centralized control.

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