一种补偿电网电压凹陷的DVR优化补偿策略-电力系统保护与控制.PDFVIP

第44 卷 第 17 期 电力系统保护与控制 Vol.44 No.17 2016 年 9 月 1 日 Power System Protection and Control Sep. 1, 2016 DOI: 10.7667/PSPC151660 一种补偿电网电压凹陷的DVR 优化补偿策略 李正明，李文文，张国松，刘 亮 (江苏大学电气信息工程学院，江苏 镇江 212000) 摘要：针对电网中敏感负荷引起的电压凹陷问题，以及提高动态电压恢复器(DVR) 的补偿质量，提出了一种优化 的综合补偿策略。首先，详细分析了 DVR 三种基本控制策略的补偿电压与功率流动，推导出最大跌落支持时间； 然后，提出了一种跌落前补偿向最小能量补偿过渡的优化综合补偿策略，利用一次过渡曲线将跌落前补偿的电压 幅值与相角逐渐过渡到最小能量补偿的值，物理意义明确，减小电压相位跳变的同时增加补偿时间。算例分析结 果表明，该法较单一补偿方法显著增加了 DVR 的补偿时间。仿真结果验证了该方法的有效性。 关键词：电压凹陷；动态电压恢复器；补偿时间；综合补偿策略 An optimized compensation strategy of DVR for gird voltage sag compensation LI Zhengming, LI Wenwen, ZHANG Guosong, LIU Liang (School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212000, China) Abstract: To solve the voltage sag problems of grid caused by sensitive load and improve the compensation efficiency of dynamic voltage restorer (DVR), an optimized comprehensive strategy is proposed. Firstly, the power flow and the maximum compensation time of DVR are analyzed using three basic compensation strategies. Then, the phase jump is corrected by pre-sag compensation. And, a transition curve, which involves the injected voltage phases of pre-sag strategy and minimum energy strategy, is used to transform pre-sag compensation to minimum energy compensation of DVR. As a result, the proposed strategy increases the supporting time for long voltage sags. The analytical study shows that the presented method significantly increases compensation time of DVR. The simulation result