Abstract: To enhance the electric frequency and power regulation performance under complex wind speed environment,a deep reinforcement learning algorithm based on a mini neural network was applied in the wind-hydro hybrid power system. The proposed algorithm was based on deep deterministic policy gradient,the frequency and power fluctuation amplitude of power grid were took as reward functions,and the control strategy was acquired finally. Further,to improve the training speed,a mini neural network featured by down-sampling and compression deferral was introduced in the algorithm. Finally,the paper compared the traditional PID controller,deep deterministic strategy gradient algorithm and mini neural network reinforcement learning algorithm in a wind-hydro hybrid power system. The results show that the intelligent algorithm improves the power response speed by 30% and the frequency response speed by47%. The controller has stronger robustness and adaptability for wind-hydro hybrid power system.