To consume more wind power and PV power, Automatic Generation Control （AGC） makes stricter requires on regulation speed, regulation accuracy and coal-fired units' load response time simultaneously. In order to further enhance the regulation performance of AGC, the influence of controller parameters on the regulation performance of AGC under the Direct Energy Balance （DEB） control structure is analyzed. Firstly, three performance indexes of AGC, regulation rate, regulation accuracy and response time,and their calculation methods are introduced. Analyzing the influencing factors of the indexes above, the control difficulties such as coupling and nonlinearity of the Coordinated Control System （CCS） are summarized. Based on the DEB control structure and optimized controller parameters, the influences of controller parameters on the regulation rate, regulation accuracy and response time are analyzed by single variable method. Simulation results show that the proportional and integral gains of the power loop and the main steam pressure loop have significant correlation with AGC regulation indexes. In order to improve the AGC regulation performance, the proportional gain of the power loop,the integral gain of the power loop and the proportional gain of the main steam pressure circuit can be moderately increased. The conclusions provide direction guidance for controller parameter optimization to enhance the regulation performance of AGC, and which are promising in engineering practices.
