Modelling and Performance Analysis of a Hybrid Wind and PV Generation System

Abstract

DG systems based on renewable energy sources (RES) gaining more attention due to their cost effectiveness and because of their abundant availability nature. The variable and unpredictable nature of unconventional energy sources lead to difficulties in operation. With day by day increasing penetration of renewable energy sources (RES) to the existing power system, Microgrid (MG) operation and control becoming more difficult. This paper demonstrates a hybrid system with PV -wind which is connected to linear load through control of inverter. The behavior of a system is to maintain the dc-link voltage regardless of change in solar irradiation, varying wind speed, and load. For the regulation purpose of dc-link voltage, a bidirectional DC-DC converter comes into picture, which is further connected to a battery. To ensure an uninterrupted power supply, the battery is connected for power management purposes between the load and other RES. Along with a DC-DC converter, LC filters are installed to reduce fluctuations in output voltages. Bidirectional DC-DC converter with battery storage system acts as MPPT controller for PV system. Cost will be reduced as there is no need of other controllers. That means PV voltage can be regulated according to the reference voltage. Similarly using torque reference signals, with hysteresis current control technique pulses for the DC-DC converter are generated. Therefore, it will work as the MPPT controller for the wind turbine. The modeling of the power system is done with a DC-DC converter, along with a bridge inverter and battery controller. PV panel is controlled by P and O technique, and wind system is controlled with MPPT technique. The simulation of the model is done in MATLAB.