Variable speed pumped storage power generation device and method for stopping variable speed pumped storage power generation device

摘要

PPROBLEM TO BE SOLVED: To obtain a pumped storage power generator in which any one of emergency stop, abrupt stop and normal stop can be carried out stably with no possibility of deviating from a variable speed range. PSOLUTION: When an abrupt stop command is delivered from a pump turbine 1, a flow rate regulating means 90 restricts the quantity of inflow water at a maximum rate. A converter controller 20 stores the frequency and phase of the exciting current of a generator-motor 2 at the time of delivery of the abrupt stop command and excites the generator-motor 2 while fixing the exciting current to the stored frequency and phase so that the generator-motor operates as a synchronous generator. Since the output from the generator-motor 2 decreases through synchronization action as a synchronous generator when the quantity of inflow water to the pump turbine 1 is restricted, rotational variation is suppressed in the output reduction process and the operation can be stopped stably. PCOPYRIGHT: (C)2004,JPO