A Model Predictive Control for Renewable Energy based AC Microgrids Without any PID Regulators

Abstract

For practical ac micro-grids based on renewable energy, this paper presents a novel model predictive control strategy that does not use any proportional-integral-differential (PID) regulators. A model predictive power control (MPPC) scheme and a model predictive voltage control (MPVC) scheme make up the proposed approach. The MPPC algorithm can be used to control the bidirectional buck-boost converters of battery energy storage systems to smooth the fluctuating output from renewable energy sources while maintaining stable dc-bus voltages as the inverters' inputs. The parallel inverters are then controlled using a combination of the MPVC scheme and the droop method to guarantee proper power sharing and stable ac voltage output. The proposed method is simpler and performs better than the conventional cascade control. This is demonstrated through simulation on the Real-Time Laboratory (RT-LAB) platform and MATLAB/Simulink