Voltage Balancing Control of Bidirectional Input-Series Output-Series Dual Active Bridge DC/DC Converters without Auxiliary Circuits

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  • 入出力を直列接続したDAB方式DC/DC変換器の補助回路を不要とした電圧バランス制御法
  • ニュウシュツリョク オ チョクレツ セツゾク シタ DAB ホウシキ DC/DC ヘンカンキ ノ ホジョ カイロ オ フヨウ ト シタ デンアツ バランス セイギョホウ

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Abstract

<p>The application of input-series output-series (ISOS) connected dual active bridge (DAB) converters has advantages in bidirectional power transmission and isolation. However, their application makes it difficult to maintain the voltage balance. In this study, a voltage balancing control method for ISOS-connected DAB converters with no auxiliary circuits is proposed. The proposed control changes methods according to the amount of load. Furthermore, a hierarchized simple controller is proposed to connect a large number of DAB converters for transmission and isolation in high voltage DC (HVDC) systems. The simulation and experimental results indicate that the proposed method can balance the voltage in bidirectional power transmission between two DC grids with unequal voltages.</p>

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