Design of phase angle measurement system for single-phase line based on MATLAB

In order to improve the power quality of the power transmission system, engineers must measure the phase angle of the transmission line to evaluate the power quality. Therefore, this article measures the phase angle by measuring the real-time voltage signal and current signal of the single-phase transmission line. This design is considered from the two aspects of hardware and software as well as the upper computer and the lower computer cooperate to test. The whole system uses ARM as the core to measure and process the parameters of the transmission line, which combined with the characteristics of ARM for signal acquisition, analog-to-digital conversion, data processing. The lower computer uploads it to the upper computer MATLAB for programming calculation through serial communication, and it uses the cross-correlation function method to measure the phase angle between voltage and current to meet the design requirements. The above design has been proved through experiments that it can be applied to engineering practice. The cross-correlation function algorithm in MATLAB closely fits the measurement of the phase angle of the transmission line. It proposes a new method for the measurement of the phase angle and lays a solid foundation for the future phase angle optimization.