Design and Analysis of Model Predictive Voltage and Current Controllers for Three Phase Voltage Source Inverter in Micro Grid

Nowadays renewable energy sources are essential to meet the real power demand. All the Distributed Energy Resources are connected to the common grid through three phase Voltage Source Inverter (VSI). The reliable operation of microgrid can be achieved by controlling three phase voltage source inverter. Voltage and frequency of the Distributed Energy Resources are continuously varying and they depend on nature. While interfacing Distributed Energy Sources to the common grid, both variables must be maintained constant. And these variables are controlled by controlling three phase voltage Source Inverter. The two loop model predictive current and voltage controller is proposed in this paper for voltage source inverter operation. The outer voltage control loop is for controlling frequency and voltage which gives reference input to the inner loop model predictive current controller. The inner current loop generates signal to regulate the inverter current. The Space Vector Pulse Width Modulation Signal Generator is used for voltage commands. The performances of the both controllers are analyzed for various load conditions. Simulation is carried out in MATLAB.