Application of OMTHD on the line voltage of cascaded multi-level inverters with adjustable DC sources

Yousefpoor, Nima; Fathi, S. H.; Farokhnia, N.; Abyaneh, H.A.

doi:10.1109/iciea.2010.5517120

Cited by 19 publications

(8 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From the above tables, it is inferred that the minimum phase voltage THD value attained from using SFLA is lower than the THD value achieved by HSA. Also, the least phase voltage THD value obtained from using SFLA is lower than the phase THD value given in [27] using GA to solve THD minimization problem. So, for THD minimization of phase voltage, SFLA seems to be more effective.…”

Section: Simulation Resultsmentioning

confidence: 99%

Optimal Allocation of TCSC and DG Unit for Congestion Management in Deregulated Power Systems

Guguloth¹,

Kumar²

2016

ijeei

View full text Add to dashboard Cite

In this paper, minimization of total harmonic distortion (THD) is discussed for the output voltage of multilevel inverter. THD minimization is an efficient method in reduction of the harmonic components of the inverter's output voltage. In multilevel inverters, the switching angles can be selected in a way that the output voltage THD will be minimized. Given that THD minimization is an optimization problem, intelligent algorithm is found to be an appropriate alternative in this regard. Shuffled Frog Leaping Algorithm and Harmony Search Algorithm are employed to find optimum switching angles to generate desired voltage value in the possible minimum THD. The obtained results of two algorithms are compared with each other to determine that which algorithm is more efficient in this regard. Also, both simulation and experimental results indicate superiority of this approach over the published work using GA in this concept. The experiments are conducted on a seven-level inverter to validate the feasibility of presented approach. IntroductionIn the recent years, power electronics engineers have centralized their attention to multilevel inverters. Compared to conventional two level inverters, stepwise output voltage is the basic advantage of multilevel inverters. This advantage will have some results such as better Electromagnetic Capability (EMC), lower switching losses, higher power quality, reduction of dv/dt stresses, lower total harmonic distortion (THD), needlessness of a transformer at distribution voltage and lower rating on power semiconductor switches [1][2][3][4][5]. Due to the advantages mentioned above for multilevel inverters, they are employed in many applications such as: distributed generation [6], micro grids [7][8], FACTs devices [9], High Voltage Direct Current (HVDC) [10], and electrical vehicles [11][12]. Multilevel inverters are mainly classified into three configurations which are the flying capacitor [13], diode clamped [14][15] and cascaded multilevel inverters [16]. Multilevel inverters are divided into two categories from the aspect of DC source value, which are called symmetric and asymmetric topologies. For DC voltage sources, capacitors, batteries and renewable energy sources can be implemented. In symmetric topology all DC sources have the same value but in asymmetric topology they have different values. Asymmetric multilevel inverters generate higher number of voltage steps for a definite number of switches compared to symmetric ones. The stepwise output voltage of multilevel inverters composed by a number of DC voltage sources [17]. An increase in the number of steps, will lead to generation of a near sinusoidal output voltage of multilevel inverter. This results in a considerable reduction in output voltage THD. Nevertheless, problems such as voltage unbalance, circuit layout and voltage clamping, limit the possible number of levels. Consequently, reducing the THD of output voltage waveform is a vital issue in designing useful and efficient multilevel inverters. Hence, impro...

show abstract

Section: Simulation Resultsmentioning

confidence: 99%

Optimal Allocation of TCSC and DG Unit for Congestion Management in Deregulated Power Systems

Guguloth¹,

Kumar²

2016

ijeei

View full text Add to dashboard Cite

show abstract

“…methods that work with high switching frequencies, including classic carrier based sinusoidal pulse width modulation (SPWM) and the space vector modulation (SVM) strategies, and methods that work with low switching frequencies, generally equal to the fundamental component frequency (the base frequency), which generate a staircase output waveform [13]. Some common techniques in the latter category are known as Optimal Minimization of the Total Harmonic Distortion (OMTHD) [7][8][9]14] and Optimized Harmonic Stepped Waveform (OHSW) [15,16]. A specific stepped waveform can be produced by several switching patterns; each of them has diverse power sharing between DC sources.…”

Section: Introductionmentioning

confidence: 99%

Power sharing improvement in cascaded multilevel inverters

Shojaei

Fathi

Farokhnia

2010

Proceedings of 14th International Power Electronics and Motion Control Conference EPE-PEMC 2010

Self Cite

View full text Add to dashboard Cite

show abstract

“…This modification is suitable incase of single phase operation, while for a three phase application there occurs a complexity in design of gate drivers and commutation circuits even though they use a single input, also the design includes many electrical components other than switches like the number of transformers [9]. To solve the above this paper projects a new method of Isolated H-Bridge Multilevel inverter [8] with the use of a three phase transformers and effort to reduce the number of switching devices in a three phase system and to validate the results by simulation and minimize the harmonic content and optimize the design using optimized stepped waveform technique [5]- [6]. The optimization is done using Genetic Algorithm [4] , [7].…”

Section: Introductionmentioning

confidence: 99%

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

Basak

Nishita

Elias

et al. 2014

2014 International Conference on Control, Instrumentation, Communication and Computational Technologies (ICCICCT)

View full text Add to dashboard Cite

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 elimin ate 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. Index Terms-Common arm, cascaded multilevel inverter, harmonic elimination using GA, OHS W technique I. 978-1-4799-4190-2/14/$31.00 ©2014 IEEE

show abstract

Application of OMTHD on the line voltage of cascaded multi-level inverters with adjustable DC sources

Cited by 19 publications

References 7 publications

Optimal Allocation of TCSC and DG Unit for Congestion Management in Deregulated Power Systems

Optimal Allocation of TCSC and DG Unit for Congestion Management in Deregulated Power Systems

Power sharing improvement in cascaded multilevel inverters

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

Contact Info

Product

Resources

About