Research on Key Technologies for AC Power Phase Error Measurement Based on Staggered Time Sampling Method

This paper mainly introduces the method of precise measurement of AC power phase error using staggered sampling technology. Firstly, a detailed introduction was given to the precise measurement scheme of AC power, and the key to phase error in AC power measurement was analyzed and studied, which lies in the difficulty of the phase error measurement results of the two voltage signals output by the voltage divider and shunt being constrained by channel gain error. Considering the influence of channel gain error on the error measurement of the signal itself, a precision measurement scheme for AC power based on staggered sampling method is proposed. By using the same channel to sample two voltage signals in staggered time, the gain error caused by inconsistent sampling channels is eliminated. A mathematical measurement model for staggered sampling phase error is established, and the control logic strategy and data processing method for staggered sampling are analyzed. The test results show that the phase error of AC power measurement based on this method can be significantly improved, and this study can provide technical support for measuring and improving the accuracy level of 10 Hz–200 kHz broadband AC power.