International Journal of Innovative Technology and Exploring Engineering (IJITEE) ISSN: 2278-3075, Volume-9 Issue-1, November 2019 4856 Retrieval Number: L37361081219/2019©BEIESP DOI: 10.35940/ijitee.L3736.119119 Published By: Blue Eyes Intelligence Engineering & Sciences Publication Power Quality Improvement of Grid Connected Photovoltaic Solar Systems using 3 level Inverter Manisha Malik, PR Sharma Abstract: This paper demonstrate simulation modeling of grid- tied SPV systems with a 3 level inverter for power quality improvement using SVPWM. To extract maximum power MPPT is used. Three level inverters are used in high power and high voltage application with reduced harmonic contents. The grid tied PV system using three levels inverter has less harmonic contents as comparison of the conventional system or without a three level inverter. The simulation study reveals that the system with three-level inverter using the SVPWM technique generates less THD compared to the conventional system. Keywords: solar system, three-level inverter, SVPWM, THD. I. INTRODUCTION The increasing demand for electricity day by day has acquired new schemes for maximizing production of electricity, that include the efficient consumption of renewable power sources such as SPV, tidal energy, wind energy system, hydel energy, etc. Some of the contemporary loads have an unpredictable nature and very complex like industrial loads. To improve voltage profile and reduce transmission losses the reactive power demand by distributed generation endorsement is required [1], [2]. In renewable energy sources, the solar PV sources offers encouraging alternative to overcoming the energy problem and generate green energy. Now a day the grid-connected solar photovoltaic system is most commonly used since they can transfer the additional solar energy to the grid & secure supply to the local load[3], [4]. The grid-connected distributed generation system has complex controllability & low efficiency. The problem of grid instability, voltage fluctuation, transient instability, harmonics, and frequency deviation occurs if a system is not properly controlled [5], [6]. In a distributed generation system most of the loads are balanced/unbalanced, linear/ nonlinear or combination of both. Revised Manuscript Received on November 06, 2019. Manisha Malik PhD Scholar, J.C Bose University of Science & Technology, YMCA Faridabad. manishamaalik@gmail.com P.R. Sharma, Professor, J.C. Bose University of Science and Technology, YMCA Faridabad. prsharma1966@gmail.com At the utility end, an unbalanced load causes unbalanced voltage. Recently, for UPS (uninterrupted power supplies) & adjustable speed drive power converter is used. They absorbed harmonic current and increasing demand for power [7].Due to this power quality problem creates in the system network [8]. The integration of natural power sources to the grid intensifies growing concern for power quality. The appropriate corrective solution for power quality problems needs a highly integrated computational technique [9]. This paper introduces simulation and exploration of grid- connected solar PV systems using multilevel inverter for harmonics elimination. A three-level inverter is implemented by using a SVPWM method. This software implementation is accomplished by means of the MATLAB/Simulink software. The SVPWM provides superior harmonic quality in three levels inverter. II. GRID CONNECTED SOLAR PHOTOVOLTIC SYSTEM A simulation model is developed for power quality scrutiny of the solar PV scheme. In a grid-tied Photovoltaic solar system MPPT technique is designed that is hinge on radial basis function network. In the PV energy system the key objective is to extract the utmost power from the erratic and intermittent type renewable power sources. The solar PV system is constructed by considering the 560-W photovoltaic solar system having the conventional electronic boost converter. The power advanced from the renewable sources leads to erratic voltage owing to high penetration of these sources in nature. Therefore, to smoothen out these variations power electronic converters are used. To track the utmost accessible power from the solar energy system it requires a maximum power point tracking control techniques. The EBC is able to convert low solar voltage to the essential value of voltage by means of changing the duty cycle at the greater switching frequency rate in the system [22]. The schematic diagram of grid-tied solar power system is presented in Fig.1. ABBREVIATIONS SVPWM– space vector pulse width modulation THD – total harmonic distortion SPV – solar photovoltaic PQ – power quality EBC – electronic boost converter MPPT – maximum power point tracking