NDLI: Voltage look-up table method to control multilevel cascaded transformerless inverters with unequal DC rail voltages

Content Provider	IET Digital Library
Author	Ebadi, Mazdak Joorabian, Mahmood Moghani, Javad Shokrollahi
Abstract	This study presents a new voltage control algorithm for multilevel inverters which are used to connect the distributed generation (DG) sources (like photovoltaic cells) to the network, which is called the voltage look-up table method (VLUTM). This method can build up an almost sinusoidal voltage at the inverter output with the least number of switching in the power circuit, and the best possible harmonic spectrum without the need to any big filtering. On the other hand, in some specific applications where the DG has been set up beside a non-linear load, VLUTM can make a reference voltage based on the reference current to take a desired current form the DG. This way the DG can compensate the major low-order load current harmonics and improve the source side current THD greatly. Decreasing the switching frequency as much as possible, which leads to better efficiency and less EMI problems, the capability of implementation both in single phase and three phase circuitry, and the very simple and desired current control, would be the major benefits of this method. The simulation results taken from Matlab/Simulink and the experimental results on a 1 kVA experimental prototype are presented to evaluate the performance of this method.
Starting Page	2300
Ending Page	2309
Page Count	10
ISSN	17554535
Volume Number	7
e-ISSN	17554543
Issue Number	Issue 9, Sep (2014)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/7/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2013.0490
Journal	IET Power Electronics
Publisher Date	2014-07-10
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Apparent Power 1 KVA Control of Electric Power System Current Control DG Sources Distributed Generation Sources Distributed Power Generation Electric Current Control EMI Problem Harmonic Distortion Harmonic Spectrum Invertors Low-order Load Current Harmonic Compensation MATLAB Simulink Environment Multilevel Cascaded Transformerless Inverter Control Nonlinear Load Power Circuit Single Phase Circuitry Sinusoidal Voltage Source Side Current THD Switching Circuit Three Phase Circuitry Unequal DC Rail Voltage VLUTM Voltage Control Voltage Control Algorithm Voltage Look-up Table Method
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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