Power Quality Enhancement Using Lyapunov Based Voltage Source Inverter for the Grid Integrated Renewable Energy System

Abstract

Abstract The evolution of high performance power electronic converters makes a feasible way to integrate the Renewable Energy System (RES) to the grid. High performance in terms of stability, good transient and steady state response, load variations is achieved in this work using Current Controlled Voltage Source Inverters (CCVSI) by deriving the control law using Lyapunov function at the expense of a time varying reference current. In this work, a single phase equivalent circuit is represented for the three phase grid connected renewable energy system, and mathematical modeling is developed to design the controller. Analysis using Lyapunov based controller is carried out to ensure the real and reactive power flow from the renewable energy system to the grid connected with the non linear load. The reference current for the controller is generated using the Symmetrical Component theory. This theory requires no transformation and desired source power factor can be achieved. To exhibit the efficacy of the Lyapunov controller, the simulation is carried out using MATLAB/Simulink environment. It is observed that the desired power factor is obtained and Total Harmonic Distortion (THD) is within the IEEE limits in the grid side. The performance of the system is validated experimentally and the results are compared with the conventional hysteresis controller for the same application.