精确检测电网电压矢量相位角方法的研究

摘要

In order to realize the unity power factor of grid connected inverter ,the phase angle of the voltage vector of the power system with the phase locked loop technology is required . Because of the distortion of the voltage of the grid and the error in the sampling process ,and deviation problem caused by the detection of voltage vector phase angle of the grid ,an im‐proved method was presented to calculate the phase angle of the voltage vector of the grid ,and realize the digital phase lock by the software .The principle and implementation of the method are described in detail ,and not only the software phase locked loop is verified by Curve Draw , but also the correctness of the proposed method is verified on the experimental platform of three phase photovoltaic grid connected inverter .%为实现并网逆变器的单位功率因数并网，需要使用锁相环技术进行电网电压矢量相位角的跟踪与锁定。由于电网电压本身的畸变和采样过程中的误差等造成检测电网电压矢量相位角的偏差问题，提出一种利用改进的反正切函数来精确计算电网电压矢量相位角，并采用软件的方法实现数字锁相。利用绘图软件Curve Draw 对软件锁相环进行了验证，且在三相光伏并网逆变器实验平台上验证了该方法的正确性。