Control of Voltage Source Inverter using Linear Quadratic Regulator for the three phase Grid integrated Renewable Energy System [articol]

Abstract

Highly efficient power electronic converter promotes the integration of renewable energy sources (RES) to the grid with the evolution of control techniques in the field of power electronics. In this paper, the optimal Linear Quadratic Regulator (LQR) is implemented to govern the flow of real and reactive power from RES to the grid through current controlled voltage source inverter (CCVSI). The CCVSI behaves as shunt active power filter along with power conversion operation. The design of LQR is carried out using the proposed single phase equivalent circuit with lesser number of state variables. This shows the reduction of complexity by minimizing the number of weighing variables. To show the supremacy of LQR, the results are compared with conventional hysteresis controller in terms of Total Harmonic Distortion (THD) and power factor. To exemplify the potency of the controller, two modes of operation depends on the RES availability is implemented. The simulation and experimental results prove the performance of controllers.