| 摘要 |
PROBLEM TO BE SOLVED: To provide a power conversion device which determines a device short circuit and a short circuit of an energy accumulating device to perform treatment without providing a short circuit device in a unit converter by using a semiconductor element to be a short circuit state at the time of failure.SOLUTION: A power conversion device includes: a unit converter 105 which has a series circuit in which switching elements 21H, 21L to be a short circuit state at the time of failure are connected in series, and a plurality of capacitors C1, C2 which are connected in parallel therewith, and outputs voltage relying on on/off of the switching elements 21H, 21L and relying on voltage of the capacitors C1, C2 or zero voltage; and a plurality of arms which connect the plurality of unit converters 105 in series. The unit converter 105 includes a current sensor CT which detects a current flowing between the switching elements 21H, 21L and the capacitors C1, C2, a voltage sensor 5 which detects voltage of the capacitors C1, C2, and a self controller 4 which determines an own failure part from the current detection value and the voltage detection value to perform treatment. |
