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针对目前常用的动态电压恢复器(DVR)检测算法难以满足DVR实时性的要求,提出一种基于在线预测的新型dq0变换检测方法。利用在线检测所得的当前时刻前数个采样点信息来还原当前时刻的基波信息,有效避免了通常dq0算法中延时较大的数字滤波器环节。将谐波补偿量与基波补偿量相加之和作为DVR输出的补偿参考波信号,保证了负荷侧电压保持稳定。仿真分析验证了该方法的正确性,实验结果表明该算法可在1ms内检测到电压扰动,并输出补偿参考电压信号,整个DVR系统能在3ms内输出补偿电压信号,满足了DVR实时补偿的需要。与采用数学变换结合低通滤波检测算法相比,该算法具有实现容易、运算速度快等优点。
In view of the fact that DVR detection algorithm commonly used today is difficult to meet the real-time requirements of DVR, a novel dq0 transform detection method based on online prediction is proposed. Using the information of several sampling points before the current time obtained by the on-line detection to restrain the fundamental information of the current moment effectively avoids the delay of the digital filter in the usual dq0 algorithm. The sum of the harmonic compensation amount and the fundamental compensation amount is used as the compensation reference wave signal output by the DVR to ensure the load side voltage remains stable. The simulation results verify the correctness of the proposed method. Experimental results show that the proposed algorithm can detect voltage disturbances within 1ms and output compensated reference voltage signals. The whole DVR system can output compensated voltage signals within 3ms, which meets the needs of DVR real-time compensation . Compared with using low-pass filter detection algorithm combined with mathematical transformation, the algorithm has the advantages of easy implementation and fast operation speed.