Hydropower generation system and power generator control method

A hydroelectric power generation system included in a channel control system including a command section configured to output a command value of a flow rate or pressure of a fluid, an opening degree control unit configured to calculate a target opening degree based on the command value output by the command section, and a motor-operated valve installed in a channel through which the fluid flows and configured to open and close in accordance with the target opening degree, the hydroelectric power generation system comprising:

• a water turbine disposed in the channel in series or parallel with the motor-operated valve;
• a generator configured to be driven by the water turbine;
• and
• a generator control unit configured to control at least one of a torque and a rotational speed of the generator with reference to opening degree information indicating a measured value of an opening degree of the motor-operated valve,
• a signal obtained by an opening degree sensor configured to measure the opening degree of the motor-operated valve being transmitted to the generator control unit as the opening degree information.