Abstract
This study presents a Grid connected Wind Energy Conversions System (WECS) where performance is improved by switching of Shunt Active Filter. Shunt active filter for non linear loads is designed to minimize the harmonics present in the wind power system. Due to large penetration of power electronic controllers in the wind power applications, switching of these power electronic circuits induces harmonics in the source which causes undesirable effects on the wind energy conversion systems and the electrical components which is in the power system network. Shunt active filter is a harmonic mitigating device comprising of voltage source inverter fed through a DC capacitor. The control strategy is based on extraction of harmonics using synchronous reference frame theory. The major contributions of this study is to extract harmonics from the grid connected Wind Energy Conversion Systems (WECS) by generating the PWM signals using the Space Vector Pulse Width Modulation (SVPWM) to control the Voltage Source Inverter (VSI) which has reduced the losses. The proposed method has been simulated and validated using MATLAB/SIMULINK. The end result of the proposed system shows that the Total Harmonic Distortion (THD) of the grid connected wind generator has been reduced at the Point of Common Coupling (PCC).
Highlights
Wind power is one kind of inexhaustible and harmless energy source in the world
The Total Harmonic Distortion is computed using FFT analysis and the analysis shows the THD value of 26.12% as shown in Fig. 7 without the shunt active filter in the system and with the addition of shunt active filter in the system the THD is reduced to 1.28% as shown in Fig. 8 which is very below the limits as specified by the IEEE 519 standard
The Space Vector Pulse Width Modulation (SVPWM) is used for the switching technique of the inverter which has reduced losses and less harmonic distortions when compared to the previous methods
Summary
Wind power is one kind of inexhaustible and harmless energy source in the world. The wind power has increasingly caught worldwide attention because of economic and environmental protection. New requirement is that the Wind Energy Conversion System (WECS) has to provide increased penetration level of wind farms highlighting grid integration, the grid integration concerns including power systems stability, Power Quality (PQ), protection and dynamic interactions of the wind power units in a wind farm (De Araujo Ribeiro et al, 2012; Strachan and Jovcic, 2002; Abreu and Shahidehpour, 2006). With the increase in non linear loads in the power system, the quality of power delivered to the load is getting distorted because of the use of large number of power electronic switches which are used to control these non linear loads. The quality of power delivered by Wind Energy Conversion System directly affects the electrical utilities and the losses in these systems are increased due to the distorted power. Many solutions have provided to improve the quality of power delivered to the load (De Araujo Ribeiro et al, 2012)
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