期刊
IET RENEWABLE POWER GENERATION
卷 12, 期 2, 页码 252-263出版社
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/iet-rpg.2016.0895
关键词
photovoltaic power systems; power grids; solar power stations; maximum power point trackers; voltage control; electric current control; invertors; asymmetrical reduced switched multilevel inverter; grid-connected PV system; single-phase grid-tied PV system; single-phase grid-tied photovoltaic system; solar PV panels; unequal power rating; DC link voltages; PV power; maximum power point tracking; voltage controllers; current controlled technique; sinusoidal current; unity power factor; inverter voltage; injected grid current; variable irradiation; grid voltage fluctuation; reduced switch asymmetrical seven-level inverter; low-power residential grid-tied PV system
This study presents the performance analysis of a new asymmetrical multi-level inverter using reduced number of switches for a single-phase grid-tied photovoltaic (PV) system. The solar PV panels of unequal power rating are connected in an appropriate manner to obtain the DC link voltages of suitable ratio for an asymmetrical cascaded multi-level inverter. The PV power, voltages as well as the current injected into the grid have been controlled using the separate maximum power point tracking, voltage controllers and a current controlled technique to achieve the maximum power with sinusoidal current with a unity power factor. The variations of DC link voltages, inverter voltage and injected grid current are simulated and are experimentally verified under the variable irradiation as well as grid voltage fluctuation. The simulation and the corresponding hardware results of the proposed reduced switch asymmetrical seven-level inverter for a low-power residential grid-tied PV system is also presented.
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