Optimized and optimally-cutting reactive compensation method and reactive compensation device

Abstract

The invention provides an optimized and optimally-cutting reactive compensation method and reactive compensation device. The method can judge a control strategy through composite physical quantity of three-phase voltage, three-phase reactive power and power factors to form a capacitor switching strategy of cutting off a capacitor and optimizing and optimally cutting a switching capacitor step by step, and accordingly reactive compensation can be accurately finished. The capacitor switching strategy uses a switching capacitor optimizing and optimally cutting method to optimize the core portion of the reactive compensation method based on work timing of an input capacitor. The optimized and optimal-cutting capacitor switching strategy is simple, practical and easy to achieve, can carry out intelligent control switch to a common compensation capacitor and a divided compensation capacitor, can meet the application requirements and accuracy requirements of reactive compensation of most low-voltage distributing networks and brings convenience to design, debugging, operation and using of a reactive compensation controller.

Description

technical field [0001] The invention relates to a control method and a control device for electric power supply and distribution, in particular to a reactive power compensation method and a reactive power compensation device for a distribution network. Background technique [0002] The reactive power compensation controller is the core component of the reactive power compensation device, and the reactive power compensation control method is one of the key technologies in the reactive power compensation controller. The compensation control method mainly includes two parts: switching judgment strategy and switching capacitor selection strategy. [0003] The switching judging strategies in the prior art are divided into power factor control mode, voltage control mode, reactive current control mode, reactive power control mode and compound control mode according to the control physical quantity. The composite control method further includes a composite control method of voltage...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to avoid the deficiencies of the prior art and to propose a reactive power compensation method based on a reactive power compensation controller and a reactive power compensation device. Optimizing the switching capacitor method, and judging the control strategy through the composite physical quantity of three-phase voltage, three-phase reactive power and power factor, thus effectively overcoming the limitation of sequential switching and cyclic switching that need to be equipped with equal-capacity capacitors, It improves the control precision, overcomes the limitation of the capacitive capacity by code switching, effectively prevents the switching oscillation at light load and insufficient compensation at heavy load, and achieves the effect of universal application, convenience and flexibility, fast and accurate switching

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