【摘要】 目前动态电压恢复器(Dynamic Voltage Restorer,DVR)装置中常用的dq变换检测法只适用于三相对称扰动,故提出了一种可用于三相不平衡电压暂降的检测方法。该方法首先对信号进行双dq变换和无时延的单相dq变换,变换后的量经由形态低通滤波器滤波后,可分别求得电压基波正序、负序和零序分量,继而推导计算出电压暂降的特征值,即各相暂降幅值、持续时间和相位跳变角。仿真结果验证了该方法的正确性,分析结果表明这种方法具有很好的实时性,适合DVR实时检测的需要。更多还原

【Abstract】 The voltage sag detection based on dq transform is usually used in dynamic voltage restorer(DVR),but it is only applicable to symmetrical voltage sags.A method for unbalanced voltage sags detection is presented,which can identify unbalanced voltage sags characteristics,such as magnitude,duration and phase-angle jump.The positive,negative and zero sequence can be obtained by using dq transform and morphological filter,and then voltage sags characteristics can be calculated.Simulation results prove that the proposed method is correct and it has better dynamic performance.The real time requirement of DVR can be satisfied with the proposed method.更多还原