International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 08 | Aug 2024
p-ISSN: 2395-0072
www.irjet.net
Investigation and Control Strategies of Three Level DCI For Power Quality Issues In Solar PV Grid Connected System Hariom Narware1, Dr. E Vijay Kumar 2 Department of Electrical Engineering, RKDF IST, SRK University,Bhopal. M.P, India ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract: The continuous supply of clean electrical power has become essential to modern civilization. However, the grid and transmission network may not always deliver clean and reliable power. Understanding the variety of power quality problems in the received supply and thenature of the loads is the first approach to the power quality solution. In this paper performance of the diode clamped three-level inverter (DCTLI)using simulation and hardware is evaluated. Performance evaluated for power quality of three-level diode clamped SPWM Voltage source inverter. FFT (Fast Fourier Transform) graph for DC-TLI and line current THD (Total Harmonic Distortion) values is compared with two-level inverter line voltage and current. MLIs (multilevel inverters) are utilized to increase the number of steps to produce high quality output waveforms. MLIs are used to eliminate harmonics and increase the inverter's performance.
Inverter (CHBMLI), (2) Flying Capacitor Multilevel Inverter (FCMLI), and (3) Diode Clamped Multilevel Inverter (DCMLI) [2]. For power quality enhancement, the researchers have consistently used, modified, tested, and implemented various MLI configurations for a wide range of applications for medium/high power and medium/high voltage systems[3][4]. Harmonics must be restricted to a specific level, according to the IEEE standard; otherwise, the core of power transformer may be saturated. Harmonics might be restricted in this scenario in two ways: on the load side or the source side. A power conditioner is commonly connectedacross the load at the point of common coupling (PCC). Precision inverter and controller design gives control over harmonics at source side [5][6].A general SVPWM algorithm is proposed for three-level inverter [5][7]. Inverter control and output voltage with losses are described[8]. Solar fed multilevel inverter power quality improvement is discussed [9]. Reactive
Keywords: Power Quality, Solar PV Grid, Diode Clamped Three-Level Inverter, Photovoltaic, Grid-connected, renewable energy.
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1 Introduction The grid power quality is affected by the rising penetration of grid- connected renewable energy sources. Major power quality challenges include harmonics, frequency variation, and voltage fluctuation. Multi- level inverters are extensively employed in grid-tied PV systems because of their characterized by lower cost and higher efficiency. Owing to the extensive use of nonlinear power electronics loads, ac distribution networks have suffered significant harmonic pollution. Nonlinear loads like lamp ballasts, motors drives, electric welding equipment, arc furnaces, electronics battery chargers, etc. Harmonic standards and guidelines, such as IEEE-519-1992 and IEC 61000, govern best practices in power system and nonlinear equipment design[1].Many strategies can be used to improve the power quality of inverters. This research develops a system that incorporates a three-level neutral point clamped (3L-NPC) inverter with a control strategy that keeps the necessary voltages for the input DC bus voltage of a grid-tied three-phase PV system [3]. The multilevel inverter (MLI) for solar inverter systems improves through increased rating and improving performance and efficiency. The rating of MLI is increased by adding more voltage levels without increasing individual device ratings, and the output voltage's harmonics are decreased. The three topologies of MLIs are: (1) Cascade H-bridge Multilevel
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Figure 1 Block diagram for solar PV grid integration The proposed solar PV grid integration block diagram is exposed in Figure 1. The system blocks represent (1) Solar panel (2) MPPT DC to DC boost converter (3) NPC three-level three phase inverter
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