Due to the difficulty of the frequency coordination in high voltage interconnection network and the problems of poor tracking performance, difficult parameter optimization and poor optimization effect, a closed-loop feedback automatic generation control based on simulated annealing and particle swarm optimization algorithm is proposed. The improved optimization algorithm combines the advantages of simulated annealing and particle swarm optimization, and optimizes the key parameters of the controller to minimize the value of area control error, so that the system can recover stably quickly. The simulation results of MATLAB/Simulink verify that the closed loop feedback AGC controller with improved parameters can restore the stability of the system quickly and achieve the control effect of frequency coordination when the tie-line of the four-machine two-area model fails.