A Simple Current Control Strategy for Single-Stage Grid Connected Three-Phase PV Inverter

P. K. Hota^1, , Babita Panda² and Bhagabat Panda²

¹Department of Electrical Engineering, Veer Surendra Sai University of Technology, Burla, India

²School of Electrical Engineering, KIIT University, Bhubaneswar, India

Cite this paper

P. K. Hota, Babita Panda and Bhagabat Panda. A Simple Current Control Strategy for Single-Stage Grid Connected Three-Phase PV Inverter. American Journal of Electrical and Electronic Engineering. 2016; 4(4):102-109. doi: 10.12691/AJEEE-4-4-1

Abstract

This paper presents a new simple method of current control strategy of grid connected PV system. As the solar irradiation is a nonlinear quantity, so the connection of PV system with the grid is a difficult task. The objective of this work is to develop a model of the photovoltaic system with MPPT connected to 11KV grid by implementing new control technique so that maximum active power transfer from PV inverter to grid can be taken place without injection of harmonics. This paper also demonstrates the dynamic model of single-stage three-phase grid connected inverter. Here, for simplification the PV system is realized as a constant DC voltage source by using maximum power point tracking (MPPT) and boost converter. A current control strategy with pulse width modulation (PWM) technique is proposed to provide pulse for voltage-source inverter (VSI). The analysis and control design of grid connected PV inverter using PI control technique is done in synchronous d-q rotating reference frame to achieve maximum output voltage response and active power. The considered system consists of a VSI, 3-Φ filter, a control system, a distribution network, load and grid. As PV inverter should inject only active power, so reactive power injected to the grid is made zero with the help of this control technique. There after the final model is simulated by using MATLAB/SIMULINK and different output waveforms are analyzed for three different conditions.

Keywords

Voltage Source inverter (VSI), PWM technique, Point of common coupling (PCC), PI Controller, Total Harmonics Distortion (THD), MATLAB/Simulink software

Copyright

This work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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