Керування установками динамічної компенсації реактивної потужності за несиметричних навантажень

Abstract

Load unbalance of electrotechnological units causes emergence of voltage unbalance in a three-phase network, which negatively affects operation of other consumers. For such units dynamic reactive power compensation devices, based on static thyristor compensators, are provided. The paper considers the problems of increasing accuracy and response speed of dynamic reactive power compensation for balancing loads of the consumers. Mathematical models and algorithms for determining the parameters of unbalanced loads are described on the basis of classical power theory. Block diagram of the device for dynamic reactive power compensation and load balancing, comprising a single control loop, is described. On the results of modelling in Simulink environment of Matlab application package it is concluded that time delay of the dynamic reactive power compensation device does not exceed 0.05 – 0.08 s.