An Approach for Determining Frequency Deviation Coefficient Considering Different Operating Conditions in AGC System

In automatic generation control (AGC), the determination of frequency deviation coefficient under the mode of tie line bias control (TBC) plays an important role in the control system stability and frequency recovery. Based on the analysis of the actual operation of AGC, this paper presents a method to determine the frequency deviation coefficient. Firstly, considering the limitation of current automation level, a frequency deviation coefficient model for all-day multiperiod under different operating modes is established according to the frequency response characteristic of power system. Then, in order to meet the requirements for frequency recovery in the actual power grid, a strategy to modify the frequency deviation coefficient according to the frequency deviation is proposed. Finally, due to the continuous improvement of the penetration rate of new energy in the power system, this paper also considered the influence of wind power in the load frequency control system (LFC) model. The effectiveness of the method is verified by the simulation results of two areas interconnected power system.