1. State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China; 2. Inner Mongolia Electric Power (Group) Co., Ltd, Hohhot 010010, China
Abstract：With the large-scale access of new energy to the power grid,the inertia of the power system gradually decreases,and the system frequency security is seriously threatened.In this study, "critical inertia" is used to quantify the minimum inertia required to maintain system stability after a critical failure.First,an analytical frequency safety calculation method is proposed.By constructing the frequency difference curve,the calculation formula of the frequency safety constraint is obtained based on the average system open-loop model.Then,based on the frequency safety constraint,the rate of change of frequency constraint (RoCoF),and the unit regulation power constraint,the calculation of the system-critical inertia is transformed into the solution of the optimization problem.Finally,the simulation system is used to verify the effectiveness and accuracy of the critical inertia calculation method in this study.The simulation results show that the larger the adjustable power range of the unit is,the smaller the critical inertia becomes.By increasing the standby capacity of the unit,the critical inertia of the system can be reduced.
易佩, 景志滨, 徐飞, 陈磊, 齐军, 姜希伟, 高旭泽. 考虑频率安全约束的电力系统临界惯量计算[J]. 清华大学学报（自然科学版）, 2022, 62(10): 1721-1729.
YI Pei, JING Zhibin, XU Fei, CHEN Lei, QI Jun, JIANG Xiwei, GAO Xuze. Calculation of the critical inertia of a power system considering frequency security constraints. Journal of Tsinghua University(Science and Technology), 2022, 62(10): 1721-1729.
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2022, Vol. 62 
