Oblon, McClelland, Maier & Neustadt, L.L.P.
Power conversion apparatus and power system
When short-circuit between DC lines is detected, a control device of a power conversion device performs protection control to turn off semiconductor switching elements in a power converter, and when elimination of the short-circuit between the DC lines is detected, the control device performs restart control of the power converter by giving a voltage command value for causing negative-polarity current in flowing through a diode in an upper arm of a second series body of a second converter cell to flow to a phase arm 4, to each converter cell in first and second arms.
Mitsubishi Electric Corporation
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Toshiyuki Takeshi Ryosuke
Fujii Kikuchi Uda