在检测三相电压波动时，针对UPQC检测单元中带锁相环的dq0旋转坐标变换法存在的误差，提出了一种改进的无锁相环三相电压波动检测方法。该方法给出了abc坐标系到静止αβ坐标系下的简化变换矩阵，通过计算αβ坐标系到dq0坐标系变换矩阵中的旋转量来代替锁相环获取的旋转量，从而减少了带锁相环检测时存在的误差。在Matlab/simulink软件平台上进行了仿真分析，仿真结果表明，该方法与传统带锁相环的dq0旋转坐标变化法相比，动态响应快速，提高了检测精度。%Aiming at deviation of the traditional dq0 rotating coordinate transformation method with phase-locked loop of UPQC in the detection of three-phase voltage fluctuation, an improved detection method without phase-locked loop for compensation signal of three-phase and three-line is proposed. The method gives the simplified transformation matrix from abc coordinates system to staticαβ coordinates system, by calculating the rotation of transformation matrix from αβ coordinates system to dq0 coordinates system instead of acquisition by the PLL, thereby reducing deviation of detection with the PLL. The proposed method is verified by simulation on the platform of Matlab/Simulink software, and the simulation results compared with traditional method show that the dynamic response is improved and performance in terms of detection accuracy is also good.
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