Current Control of Three-Phase Inverter Using Multiple Bidirectional Choppers Intended for 1.5-kV PV Systems

This article deals with a three-phase inverter for utility-scale photovoltaic (PV) systems where multiple cascaded bidirectional choppers and a three-phase line-frequency transformer with a three-legged core are used. It can achieve a wider maximum-power-point-tracking operating voltage range and th...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2023-01, Vol.59 (1), p.910-924
Main Authors: Qiao, Linyue, Shimizu, Yoshifumi, Hagiwara, Makoto
Format: Article
Language:English
Subjects:
Active control
Choppers (circuits)
Control methods
Current control
Electric potential
Gold
high efficiency photovoltaic (PV) inverter
Inverters
Maximum power
multilevel converter
Parallel operation
Photovoltaic cells
Power control
Reactive power
Transformers
utility-scale PV system
Voltage
Voltage control
wide maximum-power-point-tracking (MPPT) range
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Summary:This article deals with a three-phase inverter for utility-scale photovoltaic (PV) systems where multiple cascaded bidirectional choppers and a three-phase line-frequency transformer with a three-legged core are used. It can achieve a wider maximum-power-point-tracking operating voltage range and the elimination of high-frequency circulating current under the parallel operation of inverters simultaneously. Meanwhile, the conventional current control method based on three-phase d-q-0 transformation suffers from system instability due to a singular point existing in the dc input voltage. For solving this problem, this article proposes a new current control for the three-phase inverter, which is based on the individual current control. The proposed PV inverter structure and the current control method are designed for application in a 1.5-kV megawatt power level PV system. The validity of the control method under active and reactive power control is proved by conducting experiments using a 1.5-kW downscaled model. Furthermore, loss analyses along with comparisons with the conventional three-level inverter are provided.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2022.3204736