Mathematical Model Development for the Study of the General Primary Frequency Control in the Power Systems

General Primary Frequency Control (GPFC) of the power system limits frequency deviations from the nominal value for the safe operation of power plants and minimize the risk of disconnection of electricity consumers by the action of emergency automatics. The requirements for primary frequency control regulate the droop, which should be in the range from 4 to 6 %, and the minimum time for power up / down power by power plants. In this case, the maximum rate of power change and other characteristics of the transients are not limited. At the same time, practice shows that in some cases, emergency disturbances in power systems lead to undamped frequency fluctuations, followed by excessive disconnection of consumers and generation. For example, while adjusting group active power controllers in the energy system of NTEC (Norilsk-Taimyr Energy Company), a stable GPFC only with a droop equal to 25 %, which does not meet the requirements, was achieved. Thus, there is a need for a detailed analysis of the processes in the GPFC and the development of new improved methods of control.