Comparative Study of Modelling Techniques for Transformerless Three Phase NPC Inverter to Eliminate Harmonic in PV System

Romi Choudhary*, A.N. Tiwari**
* PG Scholar, Department of Electrical Engineering, MMMUT, Gorakhpur, Uttar Pradesh, India.
** Associate Professor, Department of Electrical Engineering, MMMUT, Gorakhpur, Uttar Pradesh, India.
Periodicity:June - August'2016
DOI : https://doi.org/10.26634/jcir.4.3.8220

Abstract

The main objective of this paper is the proposal of new modulation techniques for three phase transformerless neutral point clamped inverters to eliminate harmonics in photovoltaic systems without requiring any modification on the multilevel inverter or any additional hardware. The modulation techniques are capable of reducing the harmonics in photovoltaic systems by applying PWM (Pulse Width Modulation) and SVPWM (Space Vector Pulse Width Modulation) or

converter. A multilevel power conversion concept is based on the combination of Neutral-Point -Clamped (NPC) and floating capacitor converters. In the proposed scheme, the voltage balancing across the floating capacitors is achieved by using a proper selection of redundant switching states, the input source is PV System. The output voltage waveforms in neutral point clamped inverters can be generated at low switching frequency losses with high efficiency and low distortions. This paper presents the switching pattern to generate symmetrical gating signal to control NPCVSI (Neutral Point Clamp Voltage Source Inverter) using matlab/simulink.

Keywords

Neutral Point Clamped Inverter, Photovoltaic System, LC Filter, PWM Modulation, Space Vector Modulation.

How to Cite this Article?

Choudhary, R., and Tiwari, A.N. (2016). Comparative Study of Modelling Techniques for Transformerless Three Phase NPC Inverter to Eliminate Harmonic in PV System. i-manager’s Journal on Circuits and Systems, 4(3), 15-23. https://doi.org/10.26634/jcir.4.3.8220

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