NDLI: Control of asymmetrical cascaded multilevel inverter for a grid-connected photovoltaic system

Content Provider	IET Digital Library
Author	Sinha, Akanksha Das, Madan Kumar Jana, Kartick Chandra
Abstract	This article presents a generalised asymmetrical cascaded multilevel inverter (MLI) for a single-phase grid-connected photovoltaic (PV) system and their control strategy. The control strategy, including maximum power tracking along with a suitable interface, is implemented for maximum power transfer from the PV source to the single-phase low-power grid. The balancing of DC-link voltages for an asymmetrical MLI under variable solar parameters as well as grid parameter variation is implemented using the proposed control strategy. The voltage controllers maintain the constant DC-link voltage ratio, whereas the current controller injects the sinusoidal current into the grid at unity power factor and track the grid voltage under variation of grid voltage using grid tracker. Stability analysis of the proposed grid-connected asymmetrical inverter system is also incorporated. The whole grid-tied PV system is simulated in the MATLAB/SIMULINK environment and the exhaustive simulation results of the system under different transient conditions are presented. In addition, a laboratory prototype for a low-power grid-tied PV system has been developed and implemented using DS1103. The performance of the system is also tested at varying irradiance conditions and the corresponding experimental results are also presented.
Starting Page	1456
Ending Page	1465
Page Count	10
ISSN	17521416
Volume Number	13
e-ISSN	17521424
Issue Number	Issue 9, Jul (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/13/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2018.5230
Journal	IET Renewable Power Generation
Publisher Date	2019-03-12
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Asymmetrical MLI Constant DC-link Voltage Ratio Control of Electric Power System Current Control Current Controller DC-link Voltage Electric Current Control Generalised Asymmetrical Cascaded Multilevel Inverter Grid Parameter Variation Grid Tracker Grid Voltage Grid-connected Asymmetrical Inverter System Invertors Low-power Grid-tied PV System Maximum Power Tracking Maximum Power Transfer Photovoltaic Power System Power Factor Power Generation Control Power Grid Power System Economics Power System Managemen Power System Operation PV Source Single-phase Grid-connected Photovoltaic System Single-phase Low-power Grid Solar Power Stations Unity Power Factor Variable Solar Parameter Voltage Control Voltage Controller
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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