Power analysis of single-phase grid-connected photovoltaic systems based on two-stage current source converters

Lekgamheng, N.; Kumsuwan, Yuttana

doi:10.1109/ecticon.2012.6254121

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…In case of rectifier based input dc source the inductor size will be of the order of 100s of mh whereas in case of dc-dc converter the input inductor size is decided by the switching frequency [49], [60]. Two-stage MLC also utilizes large inductors since the switching operation of the single-phase H-bridge introduces second order frequency ripple in the input current [12]. For MMC topology the cell inductors act as storage element and the size of the submodule inductor L SM is decided by the amount of energy need to be stored in the submodule.…”

Section: E Comparison Of Topologiesmentioning

confidence: 99%

“…The paralleled current-fed MLCs with several current sources are recommended for high power ac drives [11]. The two stage current-fed MLCs achieve smooth input current with less number of semiconductor devices and they are more attractive power electronic converters for solar power integration [12]. Even though few converters has been identified in [9], for researchers to understand and to develop new current-fed MLC, there 0885-8993 (c) 2016 IEEE.…”

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confidence: 99%

“…It is made up of a three-level dc-dc boost converter stage with four semiconductor devices and a H-bridge inverter stage. The boost stage is operated at designed switching frequency whereas the H-bridge is operated at fundamental frequency[12]. The intermediate current levels are achieved by the inductors and they help in balancing the different current levels.…”

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

Kulothungan

Rathore

Edpuganti

et al. 2017

IEEE Trans. Power Electron.

108

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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: E Comparison Of Topologiesmentioning

confidence: 99%

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