IJSRST1841241 | Received : 07 Feb 2018 | Accepted : 17 Feb 2018 | January-February-2018 [ (4) 2: 1075-1081] © 2018 IJSRST | Volume 4 | Issue 2 | Print ISSN: 2395-6011 | Online ISSN: 2395-602X Themed Section: Science and Technology 1075 Study of Harmonic Content Elimination with Three Phase PWM Rectifier and Phase Controlled Rectifier J. Siva Alagesan, R. Thangasankaran, B. Karthikeyan *EEE Department, Mepco Schlenk Engineering College, Sivakasi, Tamil nadu, India ABSTRACT This Pulse width modulated rectifier is a very popular topic nowadays. The modern industrial production demands continuous and lossless conversion of electrical energy parameters. This need leads to wide spread of power semiconductor converters. The rapid development in power electronics enables to apply sophisticated control methods that eliminate negative side effects of the power converters on the supply network. The phase controlled thyristor rectifiers overload the supply network with higher harmonics and reactive power consumption. That is why the PWM rectifier is being examined. Here FPGA based controller is used to generate necessary pulses to drive the devices of the rectifier. In comparison with the phase controlled rectifier it can be controlled to consume nearly sinusoidal current with power factor equal to unity. Another advantage is its capability of energy recuperation. This paper deals with the PWM rectifier functional model realization and examination. PWM rectifier and phase controlled rectifier is compared on the basis of the input current harmonic analysis. Keywords : PWM Rectifier, Field-Programmable Gate-Array, Harmonic Distortion I. INTRODUCTION In recent years, ac to dc power conversion has become extremely essential in many power electronic applications such as battery charger, regulated dc voltage source, UPS systems, static frequency changer, ac line conditioner and motor drives [1]. Previously in most of the cases, the ac-dc power conversion was extensively carried out using passive techniques. These include diode bridge rectifiers and phase- controlled thyristor rectifiers with suitable passive filters at the output [2-5]. Though passive rectifiers are simple, these present themselves as nonlinear loads to the utility. The input currents of these rectifiers contain considerable lower order harmonics [6-8]. The harmonic currents drawn cause voltage distortion at the point of common coupling (PCC). These also cause considerable overheating in the distribution lines and the distribution transformer supplying the loads, and electromagnetic interference (EMI) with communication and control lines in the proximity. Further, a diode-bridge rectifier cannot regulate its output dc voltage against input voltage regulation. It also cannot regenerate, which is essential in certain motor drive applications. With the advent of fast semiconductor devices such as MOSFET and IGBT, and the development of various pulse width modulation (PWM) techniques [9-11], passive rectifiers are increasingly replaced with PWM rectifiers. The cost of development of such PWM rectifiers can be justified by the resulting line currents which contain lower harmonic content [12] and high power factor compared to those of line commutated rectifiers. For experimental setup the PWM gating signals are generated using FPGA based controller [13-14].