Wind turbine drive control device and control method of wind turbine drive

A wind turbine drive control device for controlling a plurality of drive devices each including a brake unit, a drive unit, and a transmission unit, the brake unit being configured to generate a braking force for stopping a second structure relative to a first structure, the brake unit of at least one drive device of the plurality of drive devices comprising an electromagnetic brake, both the first and second structures being included in a wind power generation device, the wind power generation device comprising a hydraulic brake, the drive unit being configured to generate a drive force for moving the second structure relative to the first structure, and the transmission unit being configured to transmit the braking force and the drive force to the first structure, the wind turbine drive control device comprising:

• a sensor configured to obtain information based on a force acting on a fastener fixing the plurality of drive devices to the second structure;
• and
• control circuitry configured to switch between a drive period in which the second structure is moved relative to the first structure and a stop period in which the second structure is stopped relative to the first structure, the control circuitry being further configured to, during the stop period, control the at least one drive device, in a state where a process is performed from a first state, in which both a first force generated by the electromagnetic brake and a second force generated by the hydraulic brake are generated, to a second state, in which only the first force generated by the electromagnetic brake is temporarily reduced or zero based on the obtained information, while causing the second force generated by the hydraulic brake to be applied to fix the first structure and the second structure relative to each other, to regenerate the first force generated by the electromagnetic brake while causing the second force generated by the hydraulic brake to be applied.