Y結線モジュラーマルチレベル変換器における系統電圧不平衡補償方式

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  • A Method of Voltage Unbalance Compensation on Y-connection Modular Multilevel Converter
  • Y ケッセン モジュラーマルチレベル ヘンカンキ ニ オケル ケイトウ デンアツ フヘイコウ ホショウ ホウシキ

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A STATCOM is expected to be suitable for use as voltage control equipment for a distribution system that needs to be controlled to suppress the voltage deviation caused by an increase in the number of photovoltaic energy sources. A Y-connection MMC is a promising alternative for the STATCOM circuit topology. However, it has been known that the Y-connection MMC cannot achieve capacitor voltage balance between phases with unbalance current output for compensating system voltage unbalance. To solve this problem, we propose a novel method to control the capacitor voltage in the case of an unbalance current output.<br>The proposed control involves feedforward and feedback zero sequence voltage control. The feedforward control prevents capacitor voltage unbalance between phases, which is caused by the unbalance current that the Y-connection MMC outputs. The feedback control cancels the remaining control error of the feedforward control.<br>We verified the performance of the control through transient simulation. The Y-connection MMC with the proposed control can achieve capacitor voltage balance between phases even when the Y-connection MMC outputs an unbalance current.<br>Additionally, we determined the maximum unbalance current output produced by the Y-connection MMC in relation to the rated capacitor voltage.

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