Variable speed pumped storage power generation system and variable speed pumped storage power generation method

摘要

PROBLEM TO BE SOLVED: To provide a safe variable speed pumped storage power generation system that ensures continuity of system linkage operation of a variable speed pumped storage power generation system at the time of a system failure and prevents DC breaker of a circuit breaker. A three-phase circuit between a rotor winding of a double-fed variable speed generator motor and an AC excitation device in which a stator winding is connected to a power source on a low voltage side of a transformer whose high voltage side is connected to a power system. Alternatively, in the variable speed pumped storage power generation system provided with an overvoltage suppressing device that is connected to a DC link circuit in an AC exciter and shorts the circuit via a resistor when an overvoltage occurs in any of these circuits, the transformer High voltage side circuit voltage detecting means for detecting the voltage of the high voltage side circuit of the generator, and no resistance that is connected between the rotor winding and the AC exciter and can short-circuit the three-phase circuit for three phases A short circuit; and control means for short-circuiting the short circuit for three phases on condition that an output voltage of the high-voltage circuit voltage detecting means is smaller than a predetermined value. [Selection] Figure 2