Fatehbir Singh et al. International Journal of Recent Research Aspects ISSN: 2349-7688, Vol. 3, Issue 1, March 2016, pp. 69-72 © 2016 IJRRA All Rights Reserved page- 69- Stabilization of voltage in Wind Energy Conversion System using PWM Modulated Power Filter Compensator Fatehbir Singh 1 , Shakti Singh 2 1 Assistant Professor, EEE Department, GJGI, Banur, Patiala, India 2 Assistant Professor, EIED Department, Thapar University, Patiala, India Abstract -The need to exploit ample renewable energy sources such as wind and solar is growing due to world energy shortage, financial and environmental pollution concerns. Wind energy has become one of the important alternatives because of its abundance and the strong thrust for its commercialization. However, the voltage stabilization problem of a wind energy system is dependent on changing wind conditions and varying electric load conditions. In this paper a PWM MPFC controller is designed .This PWM MPFC Controller is used to stabilize the varying wind energy output. The proposed controller is tested on system using Matlab Simulink Environment. The Results are compared with results obtained without controller PWM MPFC controller provides better stabilization of voltage as compared to results obtained without controller Index Terms: - Chaos based SVPWM, MPFC, PWM, Wind energy, Voltage stabilization, I. INTRODUCTION Use of electricity generation from renewable energy sources increased rapidly in the last decade as industrial sector become more aware about fossil fuel shortages and their environmental impacts. Wind energy is important source of electricity as it directly converts kinetic energy of air mass into electricity [1]. Wind energy Conversion systems are environmental friendly systems and is best suitable option among renewable energy resources, power generated is dependent on the wind speed. The generator is important part of WECS [2]. Induction Generator has been most frequently used in wind energy conversion system. The advantages of using Induction Generator over synchronous generator or doubly fed induction generator are its low unit cost, ruggedness and less maintenance. Due to its constant speed operation and variable wind speed, the power fluctuations are main problem in standalone system or in hybrid system [3]. Voltage stability is a major problem for standalone wind energy conversion scheme employing induction generator, under severe wind variation and dynamic load variation. So a novel stabilization scheme is used to ensure the voltage stability, efficient power utilization and boosts power Quality for a stand-alone wind energy conversion scheme [4]. In order to improve the power quality issue in the distribution systems that are combined with distributed generation (DG), a switched modulated power filter compensator (MPFC) which is driven by a Tri-loop Error Controller is used. MPFC Controller consist of following elements: Tri- loop dynamic error driven controller, three phase diode bridge, switched capacitor, PWM controlled ideal switches ,resistance and inductance[5]. Fig.1 shows equivalent circuit diagram of MPFC Controller. Fig.1. MPFC Controller [5]. With switch S 1 in open condition and switch S 2 closed, the resistor and inductor will form the part of the circuit and the capacitor forms a low-pass filter with the inductor through the diode bridge. If switch S1 is in closed position and switch S2 is opened, the resistor and inductor will not present in the circuit and the capacitor bank will form a capacitive admittance and provide reactive power to the utility grid [6].In order to control these IGBT switches a novel tri-loop driven PID controller is used. The tri-loop error driven controller consists of three basic loops. The main loop is a voltage stabilization loop, second loop consist of current stabilization loop and third loop consist of supplementary power loop to keep a near maximum energy utilization under varying wind and load condition The voltage loop keep the voltage of system at 1p.u and current loop keep the current at 1p.u.[1]. II. WIND INDUCTION GENERATOR TEST SYSTEM Fig.2. shows sample study system of WECS. Sample study system consists of wind turbine which is mechanically coupled to asynchronous generator which produces electrical energy output, this electrical energy is stepped up using step up