Research on High Precision AC Voltage Phase and Amplitude Detection Algorithms Based on SPLL and CORDIC

摘要

Aiming at the problem that SPLL (Software Phase Locked Loop) operation is slow and CORDIC (Coordinate Rotation Digital Computer) algorithm is susceptible to interference, an AC voltage phase and amplitude detection system based on SPLL and CORDIC is proposed. Using DSP (Digital Signal Processor) to run code of SPLL algorithm and FPGA (Field Programmable Gate Array) to run CORDIC algorithm circuit, the phase and amplitude of three phase AC voltage obtained by two chips are processed in DSP to improve the detection accuracy of phase and amplitude, thereby improving the control accuracy of parallel algorithm of auxiliary inverters for rail vehicles, and the phased-locked time is reduced.