Modeling, Simulation, Fault Analysis And Harmonics Mitigation Of Grid Connected Wind Farms

Abstract

Major sources of energy “fossil fuels” are about to deplete by the end of this century. Thus importance of renewable energy has increased a lot. Out of all the renewable resources, wind power is the most exploitable form of energy. The aim of this design project is to study and simulate the model of DFIG based wind farm using Matlab/Simulink. The project includes filter design for Harmonics mitigation and analyze the effects of fault conditions for a grid connected wind farm. Two back to back voltage source converters are used between rotor and grid terminals. Grid side converter is used to regulate the DC link voltage and reactive power while rotor side converter is used to control active and reactive power. Harmonics can cause disturbance in functionality of grid and can affect direction of power flow. Passive and active filters are used to control the power factor and harmonics mitigation. Passive shunt filters are considered to divert the harmonics by low impedance path. Filters design to compare their performance has been carried out. The combination of filtering topologies has been suggested to reduce the losses and the elimination of undesirable harmonics in order to achieve reduced total harmonics distortion. Network under fault conditions has been simulated and its effects and recovery to normal operating conditions has been demonstrated by simulations.