Application Study of Low-Pass Filtering PID Algorithm in Single-Phase Inverter Current Loop

For the suppression of high-frequency harmonics in the current loop of single-phase inverters, it is difficult for traditional methods to meet the requirements of high accuracy and fast response. In this paper, an innovative low-pass filtering PID control algorithm is proposed, which combines the voltage outer-loop and current inner-loop control architectures to effectively filter out the high-frequency harmonics in the output of the inverter, and realize the precise regulation. This algorithm significantly improves the voltage stability and dynamic response speed of the inverter under the complex grid, and enhances the system robustness. At the same time, this paper elaborates the optimization design principle of PID feedback parameters, and verifies its effectiveness and practicability through simulation experiments, which provides solid theoretical and experimental support for the application of low-pass filtering PID algorithms in single-phase inverter current loop.