In wind-hydro micro-grid

the intermittence and volatility of wind power easily cause power fluctuation frequently and worsen the power quality. Consequently

we proposed to apply the PI-PD control method to the control system of the hydropower unit in the micro-grid

and analyzed the control effect of conventional PID and PI-PD control on the hydropower unit by frequency domain analysis method. Moreover

we proposed to adopt the parameters adjusting method to improve the dynamic response of the hydropower unit. Meanwhile

we established awind-hydro micro-grid simulation model

analyzed the influences of conventional PID

fuzzy PID and PI-PD control on the dynamic response of the micro-grid by time domain simulation method

and analyzed the influence of different PI-PD controller parameters on the dynamic response of the micro-grid. Theoretical analysis and simulation results show that

compared with the PID and fuzzy PID control method

the PI-PD control can achieve faster adjustment speed and smaller inverse quantity adjustment.Reasonable setting parameters of the PI-PD control can shorten the dynamic response time of the micro-grid

restrain the power fluctuation

and ensure the safe and stable operation of the micro-grid.