Three-phase imbalance treatment method based on combination of STATCOM and phase-change switch

Abstract

The invention discloses a three-phase imbalance treatment method based on the combination of an STATCOM and a phase-change switch, and the method comprises the steps: detecting the voltage and current in a line, and calculating the imbalance degree epsilon in the line in real time; when the problem of three-phase imbalance occurs in the line, enabling the control center to firstly transmit a control instruction to the phase-change switch, performing phase-change operation according to the optimal phase-change strategy when the phase-change switch receives the control instruction, and calculating the unbalance degree again after the operation is completed; comparing the treated three-phase current unbalance degree [epsilon]x1 with a threshold [epsilon]n and a threshold epsilon1; if [epsilon]x1 is greater than [epsilon]n and less than epsilon1, stopping using the phase-change switch for governance, and adopting a static synchronous compensator (STATCOM) for governance, and when the degree of imbalance [epsilon]x2 after governance is less than [epsilon]n, ending the governance of the three-phase imbalance. The three-phase imbalance degree can be reduced as much as possible when the problem of three-phase imbalance is solved, and the method has very important significance in guaranteeing safe and stable operation of a power grid and improving economic benefits of the power grid.

Description

technical field [0001] The invention relates to the technical field of low-voltage power distribution control, in particular to a three-phase imbalance control method based on the combination of STATCOM and phase change switches. Background technique [0002] In the low-voltage distribution station area, the problem of three-phase imbalance is common. The three-phase imbalance in the line will lead to problems such as increased network loss, reduced transformer output, and damage to electrical equipment, which seriously affects the daily production and life of enterprises and residents. At present, in some economically underdeveloped areas, most of the treatment methods for the three-phase unbalance problem are solved by manual commutation or commutation switches, but there are still some problems: First, manual commutation needs to be paired with radio stations before adjustment In the district, the power outage is performed first, and then the line with the larger load is ...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of three-phase unbalance in distribution network, there are three commonly used methods: commutation switch type three-phase load automatic adjustment device, distribution network reconstruction and power electronic type three-phase load automatic adjustment device, which can solve the three-phase unbalance problem alone has certain limitations

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