Power Decoupling Control for a New Single-phase Photovoltaic Inverter Based on Current Continuous Control Set Model Prediction

There is an inherent low-frequency ripple power problem on the DC side of traditional single-phase photovoltaic inverters. In this regard, an active power decoupling control method based on input current continuous control set model prediction is proposed for the new single-phase photovoltaic inverter. Compared with the existing linear control method, the proposed control strategy combines the advantage of continuous control set model predictive control with automatic power decoupling, resulting in better mitigating DC side harmonics as well as faster system dynamics, and enhancing the adaptability of component parameter drift and grid voltage distortion. Finally, a new single-phase photovoltaic inverter simulation model is built in the hardware-in-the-loop real-time simulation system and a 1kW prototype is developed. The experimental results verify the effectiveness of the proposed control algorithm.