Review and prospect of research on frequency security of new power system

With the accelerating process of low carbon transformation of power system，the power grid is becoming a new power system transformation characterized byhigh proportion of new energyandhigh proportion of power electronic equipment. The fluctuation of new energy output and the large-scale access of power electronic equipment not only significantly increase the unbalanced power impact of the system，but also weaken the frequency support ability of the system，which brings a severe challenge to the frequency security. From the perspective of modeling，analysis and control of frequency security，firstly four kinds of frequency response models of power system are summarized and compared，that is，full system detailed model，linearized model，single-machine equivalent model and artificial intelligence model. Then the frequency security index of power system and its quantitative evaluation methods and influencing factors are summarized. Finally，the frequency security control methods are summarized from the aspects ofsource-load-storageand its coordinated control，the frequency emergency coordinated control system is introduced，and the aspects of modeling，analysis and control are proposed. © 2023 Electric Power Automation Equipment Press. All rights reserved.