| 摘要 |
Two generation systems 3, 8 each including inverter 8 are switched over between series connection and parallel connection by switching section 5. Reference waveform signals are mutually communicated between the two generation systems through communication lines 6. When a phase difference between these two reference waveform signals is within a predetermined range, the inverters are driven to generate an output alternating current. One of the conduction angles of thyristors 3a, 3a in two converters 3, 3 which is larger than the other is inputted to a deviation detector 42. Based on a deviation of the conduction angle inputted from a target conduction angle, an updated target rotational speed is set in a calculator 44. A throttle controller 48 controls a throttle opening angle so that an actual rotational speed converges into the target rotational speed. A ground fault is judged based on a potential difference across one node point in a first arm, connected to the earth and the other node point in a second arm of a resistance bridge provided across a pair of output terminals of either one of the inverters.
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