Oblon, McClelland, Maier & Neustadt, L.L.P.
Power conversion device
When switching operations of converter cells are stopped due to temporary voltage reduction in an AC system, a voltage determination unit performs determination regarding a voltage of each DC capacitor after a predetermined period has passed, and a charge control unit transmits a charging gate signal, via a gate control unit, to select a converter cell at a voltage level at which a self-feeding circuit of the converter cell is operable. Thus, a DC capacitor of a converter cell whose voltage is lower than the voltage level at which a self-feeding circuit is operable is charged, thereby enabling switching operations of all the converter cells.
MITSUBISHI ELECTRIC CORPORATION TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
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Ryosuke Hisanori Kaho Toshiyuki Taichiro Akihiro Takushi
Uda Taguchi Mukunoki Fujii Tsuchiya Matsuda Jimichi