Method for controlling a water sluice gate drive for a water sluice gate having an electric machine, service connection, water sluice gate drive and hydroelectric power plant

A water sluice gate drive for a water sluice gate for control of an asynchronous machine in a hydroelectric power plant, the water sluice gate drive comprising:

• a fan brake;
• an indicating unit configured to:
• detect an emergency closure situation;
• and
• detect an insufficient or absent power supply;
• an actuator unit configured to disengage the fan brake in the event that the insufficient power supply is detected;
• and
• a service connection for controlling the water sluice gate drive for self-actuated operation of the asynchronous machine, the service connection including:
• a first stage of connectable load resistors having a first quantity of connectable load resistors;
• a second stage of connectable load resistors having a second quantity of connectable load resistors;
• a first control phase element configured to connect the first and second stages of connectable load resistors depending on at least one of a voltage and a position of the water sluice gate;
• and
• a capacitor array of excitation capacitors configured to generate a rotating field in a self-actuating manner;
• wherein the service connection is configured to:
• operate the asynchronous machine in a generative island operation and under an influence of a weight force of a vertical sluice gate of the water sluice gate;
• operate the first control phase element to regulate the asynchronous machine in at least a first speed step and a second speed step, wherein the first and second speed steps being selected depending on at least one of the voltage and the position of the water sluice gate;
• and
• wherein at least one of first and second control or adjustment control stages are run for the asynchronous machine while load shifting to the fan brake.