Hybrid Control Strategy for BCD Topology Based Modular Multilevel Inverter (original) (raw)
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Design And Implementation of Modular Multilevel Inverter With Reduced Number Of Components
2017
In this paper, utilizing H-connect topology a general course multilevel inverter for the execution of 49th level inverter and another calculation in producing all voltage levels for a 49th level with less number of dc sources. Brings about diminished intricacy and practical. The examination is finished with the customary topologies and affirmed by recreation comes about.
Experimental validation of a modular multilevel inverter with less number of switches
2016 National Power Systems Conference (NPSC), 2016
This study presents a modular structure for multilevel inverter that operate in symmetric manner. The proposed modular multilevel inverter can generate staircase output voltage waveform that includes all voltage levels. The proposed multilevel inverter is compared with conventional cascaded multilevel inverter in terms of number of switches. Multicarrier sinusoidal pulse width modulation scheme adopted for generating switching signals. The effectiveness of proposed modular multilevel inverter is verified through simulation and experimental implementation.
In this study, a new type of cascaded modular multilevel inverters (CMMLIs) is presented which is able to produce a considerable number of output voltage levels with a reasonable number of components. Accordingly, each series stage of the proposed CMMLI is comprised of two same basic units that are connected with each other through two unidirectional power switches without aiming any of the full H-bridge cells. In addition, since the potentiality for generating a higher number of output voltage levels in CMMLIs hinges on the magnitude of the dc voltage sources used in each series unit, in the rest of this paper, four different algorithms for determining an appropriate value for the dc sources' magnitude are also presented. In the following, a comprehensive topological analysis between some CMMLI structures reported in the literature and proposed structure along with several simulation and experimental results will be also given to validate the lucrative benefits and viability of the proposed topology.
Generalised hybrid switching topology for a single‐phase modular multilevel inverter
Iet Power Electronics, 2014
A modified single-phase hybrid cascaded H bridge multilevel inverter with a minimum number of power electronic devices and isolated DC sources is presented in this study. It consists of two inverters (upper and lower) coupled in cascade. The lower inverter is capable of developing a multilevel output and switches at low frequency and another inverter develops two-level output and switches at high frequency. In the proposed inverter, every additional power electronic switch in the lower inverter increases the level by four. This study also introduces a generalised hybrid modulation switching strategy, which gives arithmetical and logical expressions for switching the additional device for any required increase in levels. The voltage rating of the devices, conduction and switching loss of the proposed inverter are compared with the similarly setup topologies. The generalised hybrid modulation algorithm is simulated in MATLAB/Simulink and implemented in a SPATRAN 3A DSP board. Simulation and experimental results are presented for different loading conditions.
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Energy, 2014
Modular structured multilevel inverter is very attractive in high voltage and high power applications. This inverter has a few advantages. First, by using a multilevel structure, the stress on each switching device can be reduced MMC can handle higher voltage without using an expensive and bulky step-up transformer in various application. This paper offers a performance comparison of various multicarrier continuous and discontinuous pulse width modulations (PWM) Techniques for the control of the modular multilevel converter (MMC). Selection of the carrier frequency and the multi-carrier PWM method is an important design question for the MMC topology. The paper makes an effort to apply some continuous and discontinuous modulating of MMC this comprehensive simulation has been done in MATLAB.
New Asymmetrical Modular Multilevel Inverter Topology With Reduced Number of Switches
IEEE Access
In this article, a new single-phase multilevel inverter is introduced with a reduced number of power switches and reduced voltage stress on power switches. The proposed topology consists of four input dc sources and nine semiconductor switches (eight unidirectional and one bidirectional switch). The topology can be used for asymmetrical voltage source configuration to generate seventeen voltage levels. The extended topology is constructed by a series connection of the topology circuit to produce higher voltage levels with less voltage stress on the switches without modifying the existing structure. Comparison is made with traditional and recently introduced topologies based on the number of power switches, dc sources, total blocking voltage of switches, and gate driver circuits, to prove the proposed topology's superiority. A simple nearest level modulation has been deployed as the switching scheme. Validation on the viability of the proposed topology has been carried out through simulation and hardware experimental setup. INDEX TERMS Asymmetrical configuration, modular multilevel inverter (MLI), nearest level control (NLC), total harmonics distortion (THD).
2020
1,2Post Graduate Student, Dept. of Electrical Engineering, S. K. Patel University, Gujarat, India 3Professor, Dept. of Electrical Engineering, S. K. Patel University, Gujarat, India ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract The multilevel inverters have received extensive importance in crucial applications because of low total harmonic distortion and low switch stress. With advantageous features such as modularity, scalability, multilevel waveform, no dc link, lower harmonic spectrum, and cost-saving a Modular Multilevel Converter (MMC) is suitable for high voltage, high power applications such as HVDC, MV VFD, static compensator, unified power quality conditioners, etc. The work presented here focuses on utilizing Half-bridge submodule based Modular Multilevel Converter for variable frequency drive without an intermediate DC bus between rectifier and inverter. A high-frequency...
Analysis of Three and Five Level Half-Bridge Modular Multilevel Inverter
2014
The multi level inverters are mainly classified as Diode clamped, Flying capacitor inverter and cascaded multi level inverter. The cascaded H-bridge multilevel control method is very easy when compare to other multilevel inverter because it doesn‟t require any clamping diode and flying capacitor. The simulation had been carried for single leg of three phase three and five level Half-bridge modular multilevel converter (MMC) by using submodules. The main objective of this paper is to analyse operation of Half-bridge MMC for different level of voltage by using SPWM technique which reduces total harmonic distortion and enhances output voltage and current closer to sinewave without adding any complexity to the power circuit.
Modulating Technique Based Cascaded Multilevel Inverter using Voltage Multiplier
The inclusion of multilevel inverter (MLI) in power electronics is steadily increasing in various industrial sectors. The work in this paper presents symmetrical cascaded H-bridge MLI that can be implemented to reduce the number of dc input power supply and harmonic contents present in it. The involvement of proposed topology with voltage multiplier significantly decreases the number of dc sources, providing equalization of voltage across switches with higher efficiency. The numerous sinusoidal pulse width modulation (SPWM) strategies are analysed to get reduced Total harmonic distortion (T.H.D) in output voltage waveform without using filter. The topologies mainly designed for 9-level(line to line) and further can be extended for N level using (3N-3)/2 switches and (N-1)/4 dc sources with voltage multiplier .The proposed topology with voltage multiplier for 9-level is simulated for various modulation index using different multicarrier SPWM and additional techniques like trapezoidal, multi-reference, staircase PWM techniques. The results obtained are evaluated using MATLAB/SIMULINK.
A Novel Topology Of Multilevel Inverter With Reduced Number Of Switches And DC Sources
International Journal of Power Electronics and Drive Systems (IJPEDS), 2014
This paper introduces new topology of cascaded multilevel inverter, with considerable reduction in the number of switches and DC voltage sources. The proposed topology is based on asymmetrical multilevel inverter which produces 21 levels of output with the use of 11 unidirectional switches, 3 diodes and 4 DC voltage sources. The advantages of this topology are reduction in the number of switches (2 nos.) and gate driver circuits (2 nos.), reduction in the number of DC sources (2 nos.) also cost, complexity, and space required for hardware is reduced without sacrificing the quality output of the inverter. To reduce the THD further Level shifting SPWM techniques such as PD, POD & APOD are used and comparison is shown on the basis of THDs obtained from the above SPWM techniques. Frequency of carrier waves is 1KHz, and modulation index is 1.0. To validate the proposed topology the circuit is simulated and verified by using MATLAB/Simulink.