Switching State Vector Selection Strategies for Paralleled Multilevel Current-Fed Inverter Under Unequal DC-Link Currents Condition

Vekhande, Vishal; Kothari, Nimish; Fernandes, B. G.

doi:10.1109/tpel.2014.2326958

Cited by 24 publications

(14 citation statements)

References 31 publications

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“…Under such variation the parallel H-bridge output current will have low order harmonics. To handle unequal currents a closed loop controller with modulation strategy is needed for keeping output ac current within required THD standards [45]. In [44], the combined current control with dq-frame control strategy using carrier phase shift modulation technique has been approached to handle unequal currents.…”

Section: Paralleled H-bridge Mlcmentioning

confidence: 99%

“…This control strategy has achieved 7 th order harmonic elimination, better output quality waveforms even at low switching frequency with inexpensive capacitive filter [46]. In another paper [45], space vector based strategy has been approached to operate converter under unequal input currents. In this approach, two methods of selecting switching state vectors has been obtained and the low frequency pulsation in the dc-link voltage has been eliminated for achieving better THD.…”

Section: Paralleled H-bridge Mlcmentioning

confidence: 99%

“…Zero, small and medium vectors have redundant states whereas the large vectors have only one possible combination. These redundancies are utilized for multiple purposes such as balancing the module currents in case of single-rating inductor MLC [66], reducing low frequency ripple in dc-link voltages in case of multi-rating inductor MLC [45], reduced switching transition and achieving zero average flux in case of inter-phase transformers-based MLC [33]. However, for operating single-rating inductor MLC topology zero and small vectors redundancies are not preferred because they increase switching frequency and energy loss [64].…”

Section: Svmmentioning

confidence: 99%

See 2 more Smart Citations

Current-Fed Multilevel Converters: An Overview of Circuit Topologies, Modulation Techniques, and Applications

Kulothungan

Rathore

Edpuganti

et al. 2017

IEEE Trans. Power Electron.

101

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Multilevel converters (MLC) have emerged as standard power electronic converters in high power as well as quality demanding applications. They are classified into current-fed MLC and voltage-fed MLC. Voltage-fed MLC has widely researched whereas the current-fed MLC are the recent topic of research. Based on the principle of duality between voltage and current sources, several current-fed MLCs analogous to voltage-fed MLCs have been identified. Current-fed MLC offer several advantages in terms of high power capability, transformer-less operation, short circuit protection and excellent quality of output current waveform. The goal of this paper is (1) to present review of circuit topologies, modulation schemes and applications of current-fed MLCs and, (2) to propose an emerging low device switching frequency modulation technique known as synchronous optimal pulsewidth modulation for current-fed MLCs. The circuit configuration and advantages of each topology along with various modulation techniques are discussed in detail. Compared to voltage-fed MLCs, the operation of current-fed MLCs need to satisfy additional switching constraints. Classical methods for realization these operational constraints are surveyed and new generic method has been proposed. Finally future scope of research has been presented to encourage further development of topologies and modulation techniques for current-fed MLCs.

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Section: Paralleled H-bridge Mlcmentioning

confidence: 99%

Section: Paralleled H-bridge Mlcmentioning

confidence: 99%

Section: Svmmentioning

confidence: 99%

See 1 more Smart Citation

Current-Fed Multilevel Converters: An Overview of Circuit Topologies, Modulation Techniques, and Applications

Kulothungan

Rathore

Edpuganti

et al. 2017

IEEE Trans. Power Electron.

101

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“…To address the above mentioned issues, the PV plant is divided into two arrays of equal power ratings and interfaced with the grid via two CFIs [9]- [11]. These two CFIs are connected in parallel on AC-side.…”

Section: Introductionmentioning

confidence: 99%

“…However, in reality inequality in the DC-link currents is inevitable. Therefore, space vector hexagon of this system is deformed and has no redundant switching state vectors [11]. Consequently, SVPWM implementation becomes complex.…”

Section: Introductionmentioning

confidence: 99%

Multilevel operation of a PV fed grid connected current fed inverter under equal and unequal DC link currents

Chakravarthula

Reddy

Fernandes

2015

2015 IEEE International Conference on Industrial Technology (ICIT)

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In this paper, space vector pulse width modulation control of a five-level current-fed grid tied photovoltaic (PV) system is analyzed. This system comprises of two currentfed inverters (CFIs) connected in parallel on AC-side. Each CFI is energized from a PV array of equal power rating. Unequal DC-link currents are inevitable in the above system due to partial shading effects. Therefore, the state vectors in the space vector hexagon of the above system get deformed. Consequently, implementation of SVPWM is complex i.e., in terms of sector identification and nearest vector time calculation. To address these limitations, a new SVPWM technique is proposed for above mentioned system. In this approach, each CFI is modulated corresponding to its space vector hexagon. Further, switching sequence of one CFI is phase shifted by 180 • compared to the other and vice-versa. As a result, this system generates five-levels in the output phase current with equal DC-link currents. In addition, predominant harmonic harmonic spectrum of the output phase current is double the switching frequency. This leads to reduces size of filter components. The proposed SVPWM technique is analyzed on a 9 kW system using MATLAB/Simulink for wide range of modulation index. A scaled down prototype is developed to validate the proposed SVPWM technique experimentally and results are presented.Index Terms-Current Fed inverter, photo voltaic system, space vector pulse width modulation, insulated gate bipolar transistor, fast fourier transform.

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State-of-the-art power electronics systems for solar-to-grid integration

et al. 2020

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Switching State Vector Selection Strategies for Paralleled Multilevel Current-Fed Inverter Under Unequal DC-Link Currents Condition

Cited by 24 publications

References 31 publications

Current-Fed Multilevel Converters: An Overview of Circuit Topologies, Modulation Techniques, and Applications

Current-Fed Multilevel Converters: An Overview of Circuit Topologies, Modulation Techniques, and Applications

Multilevel operation of a PV fed grid connected current fed inverter under equal and unequal DC link currents

State-of-the-art power electronics systems for solar-to-grid integration

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