一种新的电压骤降特征量检测方法

对于可有效解决电压骤降问题的动态电压恢复器(DVR)来说，准确检测出电压骤降的三大特征量即骤降幅值、持续时间和可能同时出现的相位跳变是其关键所在。文中分析研究了目前DVR中常用的基于瞬时无功功率理论的dq0变换方法和用于单相电路的瞬时电压dq0变换方法，在此基础上提出了一种新的通过对单相瞬时电压进行dq变换得到单相电压骤降的特征量的检测算法。仿真分析验证了这种方法的正确性，分析结果表明这种方法具有很好的实时性，适合DVR的实时检测需要。

A NEW METHOD TO DETECT VOLTAGE SAG CHARACTERISTICS

The correct detection of the voltage sag characteristics (its magnitude, duration and phase-angle jump appeared at the same time) is of great importance for the dynamic voltage restorer (DVR) to effectively solve the problem of voltage sag. This paper analyses the dqO transformation method based on instantaneous reactive power theory and instantaneous voltage dqO transformation method of single-phase circuit, which have been widely used in DVR. A new method to detect the dq transformation of single-phase instantaneous voltage to get the voltage sag characteristics is proposed. Simulation results validate the real-time applicability of the method proposed for DVR.