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针对谐波检测电路遇到的硬件电路延时和锁相环检测误差问题,分析了无锁相环同步坐标变换检测方法对结果的影响,并引入通用瞬时无功理论中的波形相关系数概念,分析了硬件延时对补偿效果的影响,最终提出了一种无锁相环的、考虑硬件延时补偿的改进型同步坐标变换检测法。该方法通过预设同步坐标旋转角速度,避免了锁相环的检测误差,同时在同步坐标逆变换矩阵中引入相位补偿角对硬件延时进行补偿,具有实施简单、适合数字控制、测量准确,且不受电网电压畸变影响的特点。
In view of the hardware circuit delay and phase-locked loop detection error encountered by the harmonic detection circuit, the influence of the detection method of the non-PLL synchronous coordinate transformation on the result is analyzed, and the concept of the waveform correlation coefficient in general instantaneous reactive power theory is introduced. The effect of hardware delay on the compensation effect is analyzed. Finally, an improved synchronous coordinate transformation detection method without hardware delay compensation is proposed. The method avoids the detection error of the phase-locked loop by presetting the angular rotation speed of the synchronous coordinate, and at the same time compensates the hardware delay by introducing the phase compensation angle into the inverse matrix of the synchronous coordinate transformation. The method has the advantages of simple implementation, suitable for digital control and accurate measurement, and Not affected by the voltage distortion of the grid.