Hybrid PV/wind power system control for maximum power extraction and output voltage regulation

Abstract

The objective of this paper is to analyze different control strategies for hybrid PV/wind power systems. In addition, designing the desirable controller for proposed hybrid system is the other output of this paper. There are two important goals in designing the control strategy for power systems with renewable energy sources. One important issue is extracting maximum power from the renewable energy sources such as photovoltaic and wind energy. These types of energy sources deliver a different amount of power to the power system under different conditions. There are various strategies proposed in the literature to extract maximum power from power sources. One of the most applicable strategies has been used in this paper and the performance of this strategy has been evaluated. The other issue is regulating the output voltage around a pre-determined value, in this case, the output voltage of the DC/DC converter must be controlled so that the DC/AC inverter delivers the appropriate voltage at the AC side. In this paper a hybrid Double-input (PV/Wind) power system has been proposed and simulated in the MATLAB environment and different control strategies have been evaluated. The proposed power system consists of a DC/DC converter, Wind Energy Conversion systems (WEC), and PV arrays. The model of wind power plants consists of Wind Turbine, PMSG Generator and a rectifier to deliver DC electrical power. PV modules can be connected with different configurations to form PV Arrays. The simulation of PV cells, modules, and arrays has been addressed in this paper. At the end of the paper, the performance of the proposed control strategy is studied.