Design of Variable Speed Constant Frequency Small Hydropower System

In this paper, the variable speed constant frequency technology is applied to the hydropower system and improved. The turbine side control system takes the speed as the control object and applies the maximum efficiency tracking control strategy (MPPT) to find the maximum output power point by changing the speed to ensure the maximum power output of the turbine; Abandoning the method of obtaining motor rotor position signal by using resolver in variable speed constant frequency small hydropower system, the speed information is calculated by using the sensorless rotor position detection method based on phase-locked loop, so as to connect the current inner loop and speed outer loop of variable speed constant frequency power generation system, combined with current decoupling control and SVPWM modulation algorithm, transmit electrical energy to the DC bus with maximum efficiency.