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A digital simulation program d for the design of improved automatic generation control algorithms is described. The program can also be used for study of long-term system dynunics fobwing large bad or generation ch.aeak since the simulitkm -'faster t h n real-time, the program tan be d a a real-time power system simulator for control systern checkout and operator tnining.The simulation represents the major Pacific Northwest powerplants plus equivalents for the interconnected power system. Included is a nedy developed Kaplan hydro turbine model. Automatic generation control models include pon-lineir digital ritering and recently developed digital powerplant conpollen. 'For stuchaatic load changes, close statistical compuison was obtained between simulation and actual system lecdrdg ~O D U C T I O N Automatic generation control (AGC) is the primary power system control applied on a "system" basi s. Area automatic generation control matches area generation to area load by controlling generation to d n t a i n thline interchapge schedules and 60 Hz system frequency. The simulation program was developed for two principal reasons: 1. To investigate improved central AGC algorithms compatible with + u s types of 'powerplant control equipment. Time domain simulations. of power system process and .controls are the most practical design method. 2. To develop a real-time AGC simulator for the Bonneville Power Admhktration (BPA) Dittmer Control Center.The central AGC algorithms can then control either the real system or the simulator. This will provide an operator training tool as well as means of checkout of algorithm changes, parameter adjustments, e k .In addition, the program is suitable for study of long-term system dynamics (AGC, governor, prime mover, and energy supply dynamics following large load or generation changes). h p c r F 75 454-9, recommended and approved by the IEEE Power System E~~IIw& Committee of the JEEE Power bghming sodety for presentation at the A simulation was set up which includes 10 Pacific Northwest (PNW) Federal powerplants and 2-3 equivalents for each of the 14 AGC areas interconnected with the PNW Federal system. The entire Western US. system ( a b u t 60, OOO MW) is represei~ted by lumping nonadjacent AGC areas int6 A(% areas directly interconnected with BPA.