| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that it takes time for switching to autonomous operation due to an accident of an AC system, during interconnection operation of a hydraulic power generating system and the AC system.SOLUTION: Occurrence of abnormality in an AC system is detected by detection means, a generator control inverter is switched to autonomous operation mode of DC voltage constant control upon occurrence of abnormality, a system interconnection control inverter is subjected to gate block, and the energy generated in the DC circuit of a converter device via a control unit is consumed by a brake resistor. Furthermore, determination means for determining whether or not the control start conditions for autonomous operation are satisfied is provided. When the control start conditions for autonomous operation are satisfied, a switch for system interconnection is closed, and the system interconnection control inverter is switched to an operation mode of output voltage constant control, and the generator control inverter is switched to an operation mode of DC voltage constant control.SELECTED DRAWING: Figure 2 |
