Research on Control Strategy of Three-level PV Grid-Connected Inverter Based on FCS-MPC
Yuanqing Song, Xianglian Xu, Fang Yuan, Yating Chang, Xinrui Wu, Ruiqing Zhao, Ziqi Gan, Wenyang Lei
Abstract
In the conventional control of grid-connected PV inverters, parameters such as voltage and frequency of the grid-connected PV system are easily affected by the external environmental changes, which leads to problems such as grid voltage instability and harmonic disturbances. In this paper, the control strategy of three-level PV grid-connected inverter based on Finite control set model predictive control (FCS-MPC) is studied. Firstly, the working principle of neutral point clamped (NPC) three-level inverter is introduced, and secondly, the principle of model prediction algorithm is explained, and the establishment of FCS-MPC of three-level inverter and the design of system value function are analyzed in detail. Finally, a three-level PV grid-connected inverter control system based on FCS-MPC is designed and simulated on Matlab/Simulink platform to verify the feasibility of the FCS-MPC-based control method.