International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 10 | Oct 2023
p-ISSN: 2395-0072
www.irjet.net
Power Quality Analysis Using Active NPC Multilevel inverter in PV sourced stand alone micro grid system Mallikarjuna G D1, Dr. Sheshadri G.S2, 1Assitant Professor, Dept of Electrical & Electronics Engineering, Tontadarya College of Engineering, Gadag,
Karnataka, India.
2Professor, Dept of Electrical & Electronics Engineering, Sri Siddhartha Institute of Technology, Tumukuru,
Karnataka, India. ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - In order to connect solar arrays to the utility
order to see an increase in power quality, the result of the multilevel inverter simulation will be compared to that of a traditional inverter, with a particular emphasis on total harmonic distortion (THD). Thus, the multilevel inverter's best level will be determined.
grid, power electronic converters were created. The PV array's direct current power must be converted into the alternating current needed for loads by inverters. These days, multilevel inverters are quite common in photovoltaic systems. Compared to ordinary inverters, multilevel inverters provide several benefits, particularly for high power applications. The advantages include enhanced output waveforms due to the nearly sinusoidal output voltage waveforms created by the multilevel inverter, and minimal overall harmonic distortion. To enhance power quality, the ANPC multilevel inverter performance is assessed. This paper provides the results of the simulation demonstrated that the suggested ANPC Multilevel inverter produces fewer harmonic in the micro grid system when validated against conventional inverters. The proposed system is simulated in MATLAB/Simulink software 2018b.
A Proposed three leg 5L Active NPC multi level inverter with sinusoidal PWM technique produces low THD by applying switching states is used to convert the DC quantities to three phase AC quantities which is provided to local loads in PV system.
2. Multilevel Voltage-Source Inverters Power electronic converters known as multilevel voltagesource [4] inverters (VSIs) are employed in a variety of settings, including as renewable energy systems, motor drives, and the transmission of high-voltage direct current (HVDC). These inverters are made to synthesize an output voltage waveform from many different DC voltage sources, giving rise to a stepped or multilayer waveform. When compared to conventional two-level inverters, multilevel inverters provide the benefit of producing an output voltage that is almost sinusoidal, with a lower harmonic content and less voltage stress on the switching components. They are therefore especially well-suited for applications requiring high voltage levels and high-quality voltage waveforms. The different multilevel inverters are
Key Words: SPV, Multi level inverter, SPWM.
1. INTRODUCTION A photovoltaic system, often identified as a PV system, is a device that uses sunshine to generate energy. Solar cells are devices that directly convert solar energy into electrical power. The materials used to make these cells are semiconducting. These materials absorb solar energy, which causes electrons to be released from their atoms. This allows the electrons to move through the material and generate electricity [1-2]. The cells use direct current (DC) to convert the power. A DC-to-AC inverter is required for a PV system that is correlated to the grid. The PV array's [3] DC power will be converted into alternating current using this device. One of the previously stated power sources is a photovoltaic system. The distribution network is affected in several ways by the DC-to-AC converter. Because the inverters' capacitance is excessively high, harmonic issues arise. High harmonic currents and voltages result from resonance issues that arise when harmonics occur. Multilevel inverters are an excellent option for PV system applications that require DC-to-AC conversion. This is because of the fact that it offers a good number of benefits. Power losses are eliminated and transformerless multi-level inverter topologies take the role of voltage source inverters. In
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Diode-Clamped Multilevel Inverter (Neutral-Point Clamped Inverter): This type of multilevel inverter uses diodes and clamping diodes to connect several DC voltage sources in series. The voltage levels at the output are determined by the number of voltage sources used and the clamping diode [5] configuration. Common configurations include two-level, three-level, and five-level inverters. They are relatively simple and cost-effective but are limited in scalability. Flying Capacitor Multilevel Inverter: Flying capacitor inverters use capacitors to create intermediate voltage levels between the DC voltage sources. The voltage levels are controlled by dynamically adjusting the charging and discharging of the capacitors [6]. Flying capacitor inverters can achieve a high number of voltage levels and are
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