SYSTEM AND METHOD FOR OPERATING A PUMPED-STORAGE POWER PLANT COMPRISING A DOUBLE FED INDUCTION MACHINE

摘要

A method is disclosed for operating a pumped storage power plant (1) using a double-fed asynchronous machine (4) with a frequency converter (8) in a rotor circuit (12). The method includes determining a current rotor current frequency setpoint based on a desired power to be transferred between an electrical network (2) and the asynchronous twin-feed machine (4) as a function of measured actual operating quantities. The method further includes determining a current invalid synchronous deadband ([- "f," f]; [n 0 - "n, n 0 +" n]) in response to one or more variables indicative of a current state of the pumped storage power plant 4 becomes. The synchronous dead band ([- "f," f]; [n 0 - "n, n 0 +" n]) is the minimum required rotor current frequency ("f) or speed difference (" n ") permissible for stationary operation Rotor speed determined by the synchronous speed (n 0), which is required to avoid damage and damage to components of the system due to thermal stress. The method further includes driving the inverter (8) to generate voltages and currents at the current setpoint rotor power frequency for the rotor (11) of the asynchronous machine (4), if the current target value of the rotor current frequency or speed is not in the current illegal synchronous deadband ([- "f," f]; [n 0 - "n, n 0 +" n]). A system for operating a pumped storage power plant (1) with a double-fed asynchronous machine (4) is also disclosed.