配电网三相不平衡原因分析及治理系统仿真研究

Analysis of the Causes of Three-phase Unbalanced Distribution Network and Simulation Research of Management System

三相不平衡问题是引起配电网电能质量下降的主因之一。介绍三相不平衡度计算方法,剖析配电网三相不平衡原因及其危害,设计一种基于不平衡电路应用换相开关的治理原理图,使用MATLAB软件对配网三相不平衡状态进行仿真设计。仿真分析表明,原相电压较低的负荷相可通过补偿使其负荷相电压达到允许范围,从而实现低压配电网的平衡运行。

The three-phase unbalanced problem is one of the main causes of power quality decline in distribution network.This paper introduces the calculation method of three-phase unbalance,analyzes the cause and harm of three-phase unbalance in distribution network,and design a governance schematic diagram based on unbalanced circuit using commutation switch,and use MATLAB software to simulate the three-phase unbalanced state of distribution network.The simulation results show that the load phase with low original phase voltage can reach the allowable range by compensating the load phase voltage,so as to realize the balanced operation of the low voltage distribution network.