Equal load sharing modulation technique for series-connected H-bridge multilevel converters

Naumanen, Ville; Luukko, J.; Itkonen, Toni; Pyrhönen, Olli; Pyrhönen, Juha

doi:10.1109/pesc.2008.4592466

Cited by 10 publications

(5 citation statements)

References 14 publications

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“…A lot of research of research has been done on balancing of DC capacitor voltage for multilevel converter with little success in converters with higher levels (more than five), [32] - [35]. Fig.…”

Section: Balancing Of the DC Capacitor Voltagementioning

confidence: 99%

Modeling, Control and Simulation of Cascaded 3-5-9 Hybrid Inverter Topology for Grid Interface Application

Wanjekeche

Nicolae

Jimoh

2012

Smart Power Grids 2011

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Abstract. Past research on modeling and control of Cascaded Multilevel converter has put more emphasize on conventional cascaded H-bridge inverter. In addition research has been done on realizing a five level output from one cell (i.e. 3-5) one cell topology) without cascading the cells; this fails to address the principle of realizing a general cascaded 3-5-N-level hybrid model. In this chapter, a novel phase shifted SPWM control scheme for cascaded 3-5-9 hybrid inverter topology is proposed. Superior harmonic suppression of the proposed PWM control strategy is verified using double Fourier analysis. Modeling of the hybrid inverter from first principle is described first by deriving a control law using switching techniques. Using the derived control law a standard switching model based on one cell is achieved. The switching model is expanded to realize detailed simplified average models both in abc and dqo co-ordinates. Based on the simplified models in dq0 co-ordinate, a feedback controller is designed for a cascaded 3-5-9-level hybrid inverter. The feedback controller developed is used to achieve grid voltage regulation, DC -bus voltage balance and load accommodation under varying DC sources and other load perturbations. Finally the adopted topology and the control scheme developed are verified through detailed MATLAB simulations which provide the possibility for renewable energy to be connected to the power grid without transformer.

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Section: Balancing Of the DC Capacitor Voltagementioning

confidence: 99%

Modeling, Control and Simulation of Cascaded 3-5-9 Hybrid Inverter Topology for Grid Interface Application

Wanjekeche

Nicolae

Jimoh

2012

Smart Power Grids 2011

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“…The extension of this technique to multilevel inverters is not easy, and the complications increase with the number of levels. The simplification of SVM for multilevel inverters has been widely attempted in [6–25].…”

Section: Introductionmentioning

confidence: 99%

Simplified space vector modulation technique for seven‐level cascaded H‐bridge inverter

Ahmed

Borghate

2014

IET Power Electronics

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A simplified space vector modulation (SVM) technique is proposed for the seven-level cascaded H-bridge (CHB) inverter. It is based on decomposing the seven-level space vector hexagon into a number of two-level space vector hexagons. The presented technique significantly reduces the calculation time and efforts involved in the SVM of a seven-level inverter; without any loss in the output voltage magnitude or increase in the total harmonic distortion content. A further simplified technique is also presented in this study, which significantly reduces the complexity and effort involved in the seven-level SVM. Simulation results for the seven-level CHB inverter using the proposed techniques are presented. The results are compared with results using sinusoidal pulse-width modulation (PWM) and third harmonic injection PWM to prove the validity of the proposed techniques. The proposed technique is perfectly general and can be applied to all types of multilevel inverters and extended to higher level inverters.

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“…Multi‐level VSIs offer advantages of generation of higher voltages using discrete lower voltage rating switching devices [10–20], can also offer excellent solution to the problems of CMV wherein new PWMs can be devised in order to completely eliminate the CMV. Such attempts are reported in the literature for various multi‐level VSI topologies [14, 21].…”

Section: Introductionmentioning

confidence: 99%

Pulse width modulation schemes enabling single DC power source driven dual two‐level voltage source inverter with single voltage source inverter switching

Srinivas

Kalaiselvi

2014

IET Power Electronics

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Three-level voltage space phasor can be obtained using a dual two-level voltage source inverter (VSI). Two zero sequence voltage elimination pulse width modulation (PWM) switching variants are proposed in this paper for complete elimination of zero sequence voltage (ZSV) in the dual-VSI scheme. Both the PWM variants are designed in such a way that only one inverter is switched at any instant of time; to ensure that switching power losses in the dual-VSI is limited to one inverter only at any instant of time. Analytical expressions for the dwell times of the dual-VSI are developed and presented that successfully forces the ZSV in the dual-VSI to zero; at all instants of time. As a result, both the PWMs facilitate the dual-VSI to be driven from a single DC power source only. The implementation of the proposed PWM algorithms is greatly simplified and involves just the use of instantaneous magnitudes of the reference space vector. The implementation of PWMs totally avoids the time consuming task of sector identification and do not use look up tables. The PWMs proposed in this paper are first analysed, simulated using MATLAB/SIMULINK and then verified experimentally to validate the proposed PWMs.

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Equal load sharing modulation technique for series-connected H-bridge multilevel converters

Cited by 10 publications

References 14 publications

Modeling, Control and Simulation of Cascaded 3-5-9 Hybrid Inverter Topology for Grid Interface Application

Modeling, Control and Simulation of Cascaded 3-5-9 Hybrid Inverter Topology for Grid Interface Application

Simplified space vector modulation technique for seven‐level cascaded H‐bridge inverter

Pulse width modulation schemes enabling single DC power source driven dual two‐level voltage source inverter with single voltage source inverter switching

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