Dynamic reactive power compensation method

Abstract

Disclosed is a dynamic reactive power compensation method. After electricity quality data are collected, modeling is carried out, reactive power compensation quantity demand is primarily calculated, then a reactive power adjustment variable is introduced, the purposes of inter-phase active power transferring and relative reactive power compensation are realized simultaneously, a reactive power adjustment amount adjustment factor k is introduced, finally obtained switching amounts of each phase and between phases are reduced by a certain proportion, and therefore the situation that a plenary capacitance reactive power compensation method ignores the inductive component and then causes overcompensation is avoided; dynamic reactive power optimized compensation is realized by changing switching control of a capacitor, the zero negative-sequence current of a transformer is reduced, operation loss is reduced, electricity quality is improved, and great significance is brought to improvement of the stability and reliability of a power grid, energy conservation and loss reduction.

Description

technical field [0001] The invention relates to the technical field of substation reactive power compensation, in particular to a dynamic reactive power compensation method. Background technique [0002] In order to solve the power quality problems in substations caused by load asynchrony and a large number of large-capacity inductive loads, reduce the zero-negative sequence current of substation transformers, improve power factor, and reduce losses, reactive power compensation technology has been widely used in substations. The methods currently mainly used have their own characteristics and strengths, but also have their shortcomings. Currently commonly used reactive power compensation methods include: [0003] 1) Static Var Compensator (SVC). The specific parameters of the power system are controlled by adjusting the output as capacitive or inductive current. The advantages of this method include avoiding switching shock and impact switching, simple maintenance, short r...

AI Technical Summary

Problems solved by technology

Currently commonly used SVCs have their own limitations: TCR (Thyristor controlled reactor thyristor control reactor) itself generates a large number of harmonics injected into the system; current and rated sinusoidal current), reactive power compensation shows a step, and the response speed is poor

However, in the process of practical application, this kind of technology still has problems such as complex structure, difficult control, inconvenient manufacturing and maintenance, and high cost.

[0009] To sum up, because the operation of the substation itself is very complicated, the method of switching and switching fixed capacitor banks is mainly used for reactive power compensation at present, and continuous compensation cannot be performed, and the phenomenon of over-compensation and under-compensation is prone to occur; therefore, a dynamic reactive power compensation is needed The power compensation method realizes dynamically optimized reactive power compensation by improving the switching control of capacitors, thereby improving power quality and realizing energy saving and loss reduction

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