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Uninterruptible Power Source Device
Abstract: In the present invention, among a plurality of power conversion modules (P), a number of the power conversion modules (P) necessary to supply power to a load are placed in an operational state, and the remaining power conversion modules (P) are placed in a standby state. The power conversion modules (P) in the operational state operate a converter (1), a bidirectional chopper (5), and an inverter (6) to supply power to the load. The power conversion modules (P) in the standby state stop operation of the bidirectional chopper (5) and the inverter (6) and stand by without supplying power to the load, but do operate the converter (1). If there are two or more power conversion modules (P) in the standby state, then one power conversion module (P) of the two or more power conversion modules (P) in the standby state stops operation of the converter (1), and executes diagnostic operation for diagnosing degradation of a capacitor (3) on the basis of change over time in the direct current voltage of a direct current line (2).
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