【摘要】 动态电压恢复器（DVR）被用来补偿电压凹陷,它的补偿能力主要决定于最大电压注入能力和存储的能量。为了使 DVR的有功输出 P_DVR最小化,同时减轻对负荷的扰动,文中采用了负荷端电压相量角α按恒定步长△α缓慢变化的控制策略,根据对电压凹陷期间 DVR装置的 P_DVR-a曲线的分析,提出了通过判断特定量的符号决定补偿方向的DVR的改进最小能量补偿控制方式,比直接求最优α角的计算量小,并且分析了考虑 DVR注入电压限值的改进最小能量控制。仿真结果证明了该方法比传统控制方式更能有效地减少 DVR的有功输出,比直接计算最优α角的最小能量控制方式在凹陷开始和结束的暂态过程中使负荷端电压的变化更加平稳,对敏感负荷造成的扰动更小。更多还原

【Abstract】 Dynamic voltage restorer is applied to compensate voltage sag whose compensating capability is decided by itsmaximum injected voltage and stored energy. In order to minimize the real power of DVR and reduce disturbances to loads, thispaper adopts the control strategy that a changes progressively by constant step aa. An advanced minimum-energy controlmethod that determines the compensating direction by identifying signs of two variables is proposed according to analysis of theP_DVR-α curve. It has less computation than directly computing optimal α. This paper a1so discusses advanced minimum-energycontrol when considering maximum injected voltage of DVR. Simulation results illustrate that the proposed method effectivelyreduces real power of DVR than traditional control method. Furthermore, the method also has a more smooth transient processof sag from the beginning to end than directly computing Optimal α, thus causes less disturbances to loads.更多还原