Single-Phase Grid-Connection Inverter Control Strategy Based on Echo State Network

Single-phase inverters are becoming increasingly important and popular because of the rise of distributed renewable energy. The mainstream single-phase inverter control methods include proportional resonance (PR) control and proportional integral (PI) control, which need to adjust parameters according to manual experience. In this article, an echo state network (ESN) controller is designed to control L-filter single phase inverter. Firstly, the relevant factors affecting the modulation wave required by PWM are selected by analyzing the working principle of the inverter circuit. Secondly, the nonlinear relationship between them and the modulated wave is established by ESN and gradient descent (GD) algorithm to achieve high-precision approximation of the modulated wave, which avoids the problem of artificial parameter adjustment. Finally, the simulation is carried out on MATLAB/Simulink platform. The experiments show that the ESN controller can not only accurately approximate the modulation signal required to realize the inverter control, but also compared with PR controller and PI controller, the ESN controller can realize stable grid-connection without adjustment in the initial state, and has good dynamic performance.