scispace - formally typeset
Proceedings ArticleDOI: 10.1109/ICCICCT.2014.6993041

Harmonic elimination in common arm three phase isolated H-Bridge multi level inverter

10 Jul 2014-pp 646-650
Abstract: Any system designed aims in achieving a maximized output with least resources and hence the efficiency. As known the traditional cascaded multilevel inverter consists of many number of dc sources. With the increase in switching frequency and levels of the inverter the switching losses increase. Thus this project aims in reducing the number of DC sources and also the switches that are used for the process of generation of a five level output from that of a traditional isolated cascaded multilevel inverter using the concept of common arm.This deals with an evolutionary algorithm based technique to eliminate the harmonics on a common arm three phase transformer multilevel inverter. This approach utilizes genetic algorithm as the optimization technique. In this inverter topology, the number of switches and transformers are reduced. The harmonics generated by the switching of the inverters is eliminated by GA algorithm. A comparison on the Total Harmonic Distortion (THD) between the proposed topology and the existing one is also carried out. more

Topics: H bridge (57%), Inverter (52%), Three-phase (51%)

Open accessJournal Article
Abstract: Multilevel Inverters have many advantages consisting of low cost, right performance and a few application which include PV panels and gas cells. Cascaded H-bridge MLI is one kind of these MLIs. Unlike the traditional inverter, the MLI's output voltage has a reduced THD with higher harmonic profile. Mathematical techniques for harmonic elimination are offered in some of the literatures however solving a non-linear transcendental equation set describing the SHE problem using these methods are not suitable for multi level inverters. A hybrid optimization set of rules to locate the most reliable switching angles in a Multilevel Inverter (MLI) is proposed in this paper. The switching angles are optimized to reduce low frequency harmonics. Total Harmonic Distortion (THD) method are implemented in order to lessen the switching losses. This paper summarizes different hybrid optimization techniques, which included the mechanisms of particle swarm optimization (PSO), genetic algorithm (GA), fuzzy logic controller and biography based algorithm which will optimize parameters. A comparative study of different algorithm has been studied. more

Topics: Total harmonic distortion (58%), Harmonic (55%), Inverter (53%) more

2 Citations


Proceedings ArticleDOI: 10.1109/IAS.1995.530601
Jih-Sheng Lai1, Fang Zheng PengInstitutions (1)
08 Oct 1995-
Abstract: Multilevel voltage source converters are emerging as a new breed of power converter options for high-power applications. The multilevel voltage source converters typically synthesize the staircase voltage wave from several levels of DC capacitor voltages. One of the major limitations of the multilevel converters is the voltage unbalance between different levels. The techniques to balance the voltage between different levels normally involve voltage clamping or capacitor charge control. There are several ways of implementing voltage balance in multilevel converters. Without considering the traditional magnetic coupled converters, this paper presents three recently developed multilevel voltage source converters: (1) diode-clamp, (2) flying-capacitors, and (3) cascaded-inverters with separate DC sources. The operating principle, features, constraints, and potential applications of these converters are discussed. more

Topics: Voltage source (60%), Converters (56%), Electronic circuit (52%) more

3,134 Citations

Open accessJournal ArticleDOI: 10.1109/TIE.2010.2049719
Samir Kouro1, Mariusz Malinowski2, K. Gopakumar3, Josep Pou  +5 moreInstitutions (5)
Abstract: Multilevel converters have been under research and development for more than three decades and have found successful industrial application. However, this is still a technology under development, and many new contributions and new commercial topologies have been reported in the last few years. The aim of this paper is to group and review these recent contributions, in order to establish the current state of the art and trends of the technology, to provide readers with a comprehensive and insightful review of where multilevel converter technology stands and is heading. This paper first presents a brief overview of well-established multilevel converters strongly oriented to their current state in industrial applications to then center the discussion on the new converters that have made their way into the industry. In addition, new promising topologies are discussed. Recent advances made in modulation and control of multilevel converters are also addressed. A great part of this paper is devoted to show nontraditional applications powered by multilevel converters and how multilevel converters are becoming an enabling technology in many industrial sectors. Finally, some future trends and challenges in the further development of this technology are discussed to motivate future contributions that address open problems and explore new possibilities. more

2,953 Citations

Journal ArticleDOI: 10.1109/TIE.2007.907044
Jose Rodriguez1, Steffen Bernet2, Bin Wu3, J. Pontt4  +1 moreInstitutions (4)
Abstract: This paper presents a technology review of voltage-source-converter topologies for industrial medium-voltage drives. In this highly active area, different converter topologies and circuits have found their application in the market. This paper covers the high-power voltage-source inverter and the most used multilevel-inverter topologies, including the neutral-point-clamped, cascaded H-bridge, and flying-capacitor converters. This paper presents the operating principle of each topology and a review of the most relevant modulation methods, focused mainly on those used by industry. In addition, the latest advances and future trends of the technology are discussed. It is concluded that the topology and modulation-method selection are closely related to each particular application, leaving a space on the market for all the different solutions, depending on their unique features and limitations like power or voltage level, dynamic performance, reliability, costs, and other technical specifications. more

2,051 Citations

Open accessProceedings ArticleDOI: 10.1109/PEDS.2005.1619871
28 Nov 2005-
Abstract: The paper presents an optimal solution for eliminating pre-specified order of harmonics from a stepped waveform of a multilevel cascaded inverter topology with non-equal dc sources. The main challenge of solving the associated nonlinear equations, which are transcendental in nature and therefore have multiple solutions, is the convergence of the relevant algorithms and therefore an initial point selected considerably close to the exact solution is required. The paper discusses an efficient hybrid real coded genetic algorithm (HRCGA) that reduces significantly the computational burden resulting in fast convergence. An objective function describing a measure of effectiveness of eliminating selected order of harmonics while controlling the fundamental component is derived. Different cases including seven- and nine-level inverters with different values of modulation indices are reported. The theoretical findings are validated through simulation studies more

Topics: Harmonics (52%), Convergence (routing) (50%)

35 Citations

Open accessProceedings Article
01 Nov 2009-
Abstract: The Optimized Harmonic Stepped Waveform (OHSW) technique is an effective method for reduction of multi-level inverter's harmonics. This technique is very efficient for improving the quality of multi-level inverter output voltage. It is usually assumed that cascaded multi-level inverters have equal DC sources. In practice, however, this will not be happened even if the DC sources are nominally equal. In addition, in some applications the DC sources can be regulated. Employing adjustable DC sources can increase degree of freedom to eliminate more harmonics in OHSW technique and therefore can result in substantial improvement in the total harmonic distortion (THD). In this paper first, the 7-level cascaded inverter structure is briefly described. Then, the basic idea and concept of three-phase and single-phase OHSW technique is described. Ultimately, the results obtained by simulation for the OHSW technique are analyzed and the using OHSW in multi-level inverter with constant DC sources is compared with adjustable DC sources. Genetic Algorithm (GA) is used as a powerful tool to calculate optimal switching angles. Computer simulations show that more harmonics can be eliminated in OHSW technique by employing adjustable DC sources which can be controlled. more

Topics: Total harmonic distortion (53%), Inverter (53%), Harmonic (52%) more

24 Citations

No. of citations received by the Paper in previous years