Abstract

This paper presents a single-stage three-level Neutral Point Clamped (NPC) inverter for connection to the electrical power grid, with integrated Maximum Power Point Tracking (MPPT) algorithm to extract the maximum power available from solar photovoltaic (PV) panels. This single-stage topology is more compact than the traditional topology, it was chosen because with the proper control strategy. It is suitable to connect the PV panels to the power grid. The paper describes the design of a 5 kW NPC inverter for the interface of PV panels with the power grid, presenting the circuit parameters and the description of the control algorithms. A phase locked loop control is used to connect the inverter into the grid. Then, a proposed DC Link voltage control to regulate the input voltage of the inverter. Although an MPPT algorithm was used to optimize the energy extraction and the system efficiency. Inverter Output Current control to produce an output current (current injected in the power grid) with low Total Harmonic Distortion (THD) implemented in a DSP. Simulation and experimental results verify the correct operation of the proposed system, even with fluctuations in the solar radiation.

Highlights

  • As the population in the world increases, the renewable energy sources acquire growing importance due to the global energy demand

  • Simulation results are presented at nominal voltage of 800V DC and experimental results provided at a nominal voltage of 61.95V dc as shown in the table III, built in the laboratory

  • This paper presents the design, simulation and experimental results of a 5 kW single-stage three-level Neutral Point Clamped (NPC) inverter for connection to the electrical power grid, with integrated Maximum Power Point Tracking (MPPT) algorithm to extract the maximum available power from solar photovoltaic (PV) panels

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Summary

Introduction

As the population in the world increases, the renewable energy sources acquire growing importance due to the global energy demand. Global warming and energy policies have become a hot topic on the international agenda as countries are making an effort to reduce the greenhouse gas emissions. Solar and wind energy sources have become very popular as result of the increasing research on new technologies, namely photovoltaic (PV) power generation technologies that are being widely studied. Despite the achieved developments in solar technologies further improvements can be done in order to lower their price, increase efficiency and maximize the energy extraction. Grid connected PV systems consist in the PV panels array and a power converter. Several topologies of converter can be adopted

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