1MW Power Conditioning System with Multiple DC Inputs for PVs and Batteries

Furusho, Yasuaki; Noto, Yasuyuki; Fujii, Kansuke

doi:10.23919/ipec.2018.8507515

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…The carrier frequency of each cell in the auxiliary converter in the two-cell inverter was set to f SA = 3 kHz to achieve the same equivalent switching frequency of 6 kHz as that of the three-cell inverter calculated in [1]. The dccapacitor voltages of the two inverters are different because of different cell numbers and they are determined according to (9). The loss calculation method is based on the methods shown in [31], [32], and the results are shown in Fig.…”

Section: Loss and Efficiency Comparisonsmentioning

confidence: 99%

Evaluation and Performance of Three-Phase Inverter Using Multiple Bidirectional Choppers Intended for 1.5-kVdc PV Systems

Qiao

Hagiwara

2023

IEEE Access

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This article focuses on the chopper-cell number of a novel three-phase inverter for utilityscale photovoltaic (PV) systems where multiple cascaded bidirectional chopper cells and a three-phase line-frequency transformer with a three-legged core are used. The inverter per phase is composed of a main converter, which is equivalent to the conventional bidirectional chopper, and an auxiliary converter, which is composed of multiple cascaded chopper cells. Although the inverter performance can be improved by increasing the chopper-cell number because of increased switching frequency and reduced voltage steps, the increased cell number may result in increased converter loss and cost. However, no paper has evaluated the chopper-cell number of the inverter to the best of the authors' knowledge. Further, no paper has carried out experimental verification of the inverter during the power faults. This article evaluates the inverter using two cells per phase (two-cell inverter) with the one using three cells per phase (three-cell inverter) under the same equivalent switching frequency in terms of converter loss, efficiency, and steady/transient state performance. The numerical analysis shows that the two-cell inverter shows superiority over the threecell inverter in converter efficiency. Further, the experiments using a 1.5-kW downscaled model verify the inverter performance under the normal and fault conditions.INDEX TERMS Low-voltage ride-through (LVRT), modular multilevel cascade converters (MMCCs), utility-scale PV systems.

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Section: Loss and Efficiency Comparisonsmentioning

confidence: 99%

Evaluation and Performance of Three-Phase Inverter Using Multiple Bidirectional Choppers Intended for 1.5-kVdc PV Systems

Qiao

Hagiwara

2023

IEEE Access

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“…. Furthermore, (9a) can be written now 4 , and i o =x 4 /R l are specified, all the stationary values can be calculated using:…”

Section: A Nonlinear Model For the Convertermentioning

confidence: 99%

“…An intense research effort is being made to increase the use of renewable energy in all human activities. Techniques to take advantage of solar [1][2][3][4], wind [5][6][7], and hydrogen based [8][9][10], among other kinds of clean energies, are being developed. In some applications, it is necessary to jointly use several of these sources to feed a single load.…”

Section: Introductionmentioning

confidence: 99%

Modeling, Design Procedure and Control of a Low-Cost High-Gain Multi-Input Step-Up Converter

et al. 2019

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The use of several different sources to feed a load jointly is convenient in many applications, in particular those where two or more renewable energy sources are employed. These applications include energy harvesting, hybrid vehicles, and off-grid systems. A multi-input converter able to admit sources of different characteristics and select the output power of each source is necessary in such applications. Several topologies of multi-input converters have been proposed to this aim; however, most of them are controlled by simple strategies based on a small signal model of multi-input converters. In this work, a low cost high gain step-up multi-input converter is analyzed. A nonlinear model is derived. Using this model, a detailed design procedure is proposed. A 500 W converter prototype was constructed to confirm that the model predicted the real behavior of the converter. Using the nonlinear model, indirect voltage control of basic converters was extended to the multi-input converter. The obtained controller had a fast performance, and it was robust under load and input voltage variations. With the obtained model, the proposed design procedure, and the controller, a converter that was initially proposed for photovoltaic applications was enabled to be used in a broader range of applications. The herein exposed ideas for modeling, the design procedure, and control could be also applied to other multi-input converters.

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Performance of Three-phase Inverter Using Multiple Bidirectional Choppers for 1.5-kV PV Systems Capable of Wide MPPT Range

Qiao

Hagiwara

2022

2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia)

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1MW Power Conditioning System with Multiple DC Inputs for PVs and Batteries

Cited by 3 publications

References 10 publications

Evaluation and Performance of Three-Phase Inverter Using Multiple Bidirectional Choppers Intended for 1.5-kVdc PV Systems

Evaluation and Performance of Three-Phase Inverter Using Multiple Bidirectional Choppers Intended for 1.5-kVdc PV Systems

Modeling, Design Procedure and Control of a Low-Cost High-Gain Multi-Input Step-Up Converter

Performance of Three-phase Inverter Using Multiple Bidirectional Choppers for 1.5-kV PV Systems Capable of Wide MPPT Range

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