International Journal of Science Technology & Management www.ijstm.com Volume No.04, Special Issue No.01, February 2015 ISSN (Print) 2394-1529, (Online) 2394-1537 575 | Page A STUDY PAPER BASED ON SPACE VECTOR PULSE WIDTH MODULATION TECHNIQUE FOR POWER QUALITY IMPROVEMENT Aasha Chauhan 1 , Dr. Ravindra Pratap Singh 2 1 Department of Electrical Engineering, Ph.D Research Scholar, JJT University, Rajasthan, (India) 2 Department of Electrical Engineering, Research Guide, J.B. Knowledge Park, Haryana, (India) ABSTRACT This paper presents the comprehensive reviews for mitigation of the harmonic problems in the power supply which is caused by the non-linear characteristic based loads. The presence of harmonics leads to transformer heating, electromagnetic interference and solid state device mal-functioning. Hence keeping in view of the above concern, research has been carried out to mitigate harmonics. The most popular and best modulation method used among Pulse Width Modulation (PWM) technique is Space Vector Modulation (SVM) method as it generates low total harmonic distortion (THD). This paper also represents the current status of mitigation of power quality problems by FACTS controllers. The authors strongly believe that the literature survey will be very much useful to the researchers for finding out the relevant references in the field of power quality problems mitigated by FACTS controllers. Keywords: Flexible Alternating Current Transmission Systems (FACTS), Space vector pulse width modulation (SVPWM), Static Synchronous Compensator (STATCOM), Total Harmonic Distortion (THD), Voltage Source Inverter (VSI). I. INTRODUCTION Space Vector Modulation was first introduced by the German researchers in the mid of 1980s. This technique showed several advantages over the traditional pulse width modulation (PWM) technique. SVM technique can maximize the output voltage and also reduce the switching number at the same carrier frequency of the PWM method. A number of pulse width modulation (PWM) schemes are used to obtain variable voltage and frequency supply. The most widely used PWM schemes for three-phase voltage source inverters are carrier- based sinusoidal PWM and space vector PWM (SVPWM). There is an increasing trend of using space vector PWM (SVPWM) because of their easier digital realization and better DC bus utilization [1-3]. Moreover, it gives a higher output voltage for the same DC bus voltage, lower switching losses, and better harmonic performance in comparison to carrier based sinusoidal pulse width modulation [4]. In SVM technique, the combined effect of three phases is considered as one vector. Firstly, three phases are converted into two phases for simplicity [5]. Here space vectors are expressed as any time varying quantities which always sum to zero and are separated by 120° are expressed as space vectors. Facts device is an effective solution for regulation of voltage and compensation of reactive power. The most common configuration of the solid state device consists of voltage source inverter and DC voltage source. By injecting a variable magnitude current at the point of