基于dq变换的动态电压恢复器综合求导检测算法

针对动态电压恢复器（DVR）中电压暂降的检测问题，在分析已有dq变换检测算法的基础上提出基于dq变换的综合求导检测算法。该算法适用于单相系统电压暂降的检测，也可用于三相电压暂降的识别；能够同时消除由单相系统构造虚拟三相系统时产生的时延和分离dq坐标系下的直流分量时产生的时延，并且考虑了发生电压暂降过程中可能伴随的谐波的影响。仿真分析结果表明该算法检测精度较高，实时性好，适合DVR检测的需要。

A Novel Integrated Derivation Detection Algorithm Based on dq Transformation for the Dynamic Voltage Restorer

In the light of the detection of the voltage sag in DVR, a novel integrated derivation detection algorithm based on dq transformation is presented after analyzing the existing dq transformation detection algorithm. This algorithm can be used to detect both the single voltage sag and the three phase voltage sag. It can simultaneously eliminate the delay in the process of constructing the dummy three-phase system from the single system and that in the process of separating the direct current part under the dq coordinate system, while taking into account the influence of harmonics in the course of voltage sag. The simulation results show that the algorithm is easy to implement and has good real time performance, so that it can meet the demand of DVR detection.