基于最小有功注入策略的级联逆变器动态电压恢复器  

Cascaded inverter dynamic voltage restorer based on minimum active power injection strategy

作　　者：侯世英[1] 刘早晨[1] 嵇丽明[1] 庹元科[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《电力自动化设备》2009年第8期33-36,共4页Electric Power Automation Equipment

摘　　要：基于最小有功注入策略,对使用电容储能的级联逆变器动态电压恢复器(DVR)补偿电压跌落新方法进行了研究,选取负载电流相量为参考相量对DVR进行相量图分析,使各物理量之间的关系更清晰,便于定量求解。定量分析了DVR的补偿能力和负荷功率因数的函数关系,据此得到了4种不同功率因数下DVR注入有功功率和补偿电压跌落的曲线。设计了优化DVR注入有功功率的控制方式,特别考虑了DVR注入电压达到最高限额的补偿情况,仿真结果表明在保证最小电容储能的情况下,最小有功功率注入策略级联逆变器降低了DVR装置与电力系统交换的有功功率以及直流侧电容的容量,可以处理更长时间和更严重的电压跌落。Based on the minimum active power injection strategy,a method for sag mitigation in distribution network by a cascaded inverter DVR（Dynamic Voltage Restorer） with energy storage capability is studied, which uses the load cun＇ent phasor as the reference in phasor chart analysis to make the quantitative relationship among variables simpler and clearer. The functional relation between DVR compensation capability and load power factor is quantitatively analyzed and the curves of the injected DVR active power versus the voltage sag for four different power factors are obtained. The optimal control strategy of DVR active power injection is designed and the case when the injected voltage reaches its upper limit is specially considered. Simulation results show the proposed method reduces the active power injection as well as the capacity of DC capacitor,being able to mitigate the severer sag with longer duration.

关 键 词：电压跌落 级联逆变器 动态电压恢复器 最小有功注入 功率因数 

分 类 号：TM761[电气工程—电力系统及自动化] TM712