Research on Mixed Logic Dynamic Modeling and Finite Control Set Model Predictive Control of Multi-Inverter Parallel System

Parallel connection of multiple inverters is an important means to solve the expansion, reserve and protection distributed power generation, such as photovoltaics. In view shortcomings traditional droop control methods weak anti-interference ability, low tracking accuracy inverter output voltage serious circulation phenomenon, a finite set model predictive (FCS-MPC) strategy microgrid multi-inverter parallel system based on Mixed Logical Dynamical (MLD) modeling proposed. Firstly, MLD method introduced logical variables, combining discrete events continuous form overall differential equation, which makes more accurate. Then controller designed model, constraints are added objective function, can not only real-time changes by online optimization, but also effectively obtain higher lower total harmonic distortion rate (Total Harmonics Distortion, THD); suppress circulating current between inverters, good dynamic response. Finally, simulation carried out MATLAB/Simulink verify correctness rationality proposed strategy. This paper aims provide guidance for design optimal systems.