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927 results on '"Itoh, Jun-Ichi"'

22. Distributed Control Method for Power Conversion System With Series-Connected Autonomous Modular Converters

Author

Yamanokuchi, Koki, Watanabe, Hiroki, and Itoh, Jun-Ichi

Abstract

This article proposes a current droop control for series-connected current source converters in a universal smart power module (USPM) concept. In this concept, power conversion systems are constructed by USPMs, which have a high-speed controller and autonomous distributed control. USPM enhances versatility by its high flexibility and usability compared to power electronics building blocks, which is a similar concept. In this system, noninterference control is required because these USPMs are operated independently without sharing information with each other. Droop control for the voltage source converter is a common solution for parallel-connected converters. Likewise, a stabilization method for the current-source-type converter connected in series is necessary for the USPM system. The proposed method in this article solves these problems. In particular, the configuration of the current controller and its gain design method is verified in order to achieve a stable condition and high-speed response. The experimental results for the 500-W system reveal that the stability limit of the PI control adopting the proposed current droop control agrees with the analytical results with an error of 1.3%. Furthermore, this article demonstrates that the current deviation agrees with that of the design value with an error of 3.0% or less.

Published
2023
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43. Three‐phase wireless power supply system using a matrix converter.

Author

Yamanokuchi, Koki, Kusaka, Keisuke, and Itoh, Jun‐Ichi

Subjects
MATRIX converters, WIRELESS power transmission, DC-to-DC converters
Abstract

This paper proposes a three‐phase wireless power transfer (WPT) system with a three‐phase‐to‐three‐phase matrix converter. The proposed system directly converts power from an AC grid to high‐frequency AC for WPT. The three‐phase WPT system with the matrix converter is effectively expands the lifetime of the WPT system. A novel hybrid commutation method, which is suitable for the WPT system with a resonant characteristic, is proposed to avoid the commutation failure of the matrix converter. The strategy of the proposed hybrid commutation is based on an estimation of the current direction considering the resonant characteristics and elimination of commutation in the critical area. The proposed commutation method achieves an AC input‐current total harmonic distortion (THD) of 4.7% with the resonant three‐phase load without a current sensor on the high‐frequency side. Furthermore, the proposed WPT system achieves a system efficiency of 88.2% at a load of 4 kW. [ABSTRACT FROM AUTHOR]

Published
2023
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