电力系统惯量需求:概念、指标及评估方法OA北大核心CSTPCD

The low-inertia operation risk is a major problem in the process of low-carbon transition of electric power,and it has become a pain point and a key bottleneck restricting the sustainable development of new power systems with renewable energy as the main body.Inertia requirement evaluation is the foundation for realizing risk perception and control of low-inertia systems.However,the current concepts related to inertia requirements are still unclear and do not fully consider the influence of fault types and the security defense lines of power grid frequency,resulting in unreasonable evaluation results.This paper studies the inertia requirement analysis of the power system from three aspects:basic concepts,characterization indexes,and evaluation methods.Firstly,considering the multi-stage response characteristics of inertia support power,the basic concept of inertia requirement for the power system is proposed,and quantitative characterization indexes for inertia requirements are presented from the perspective of energy and time sequence.Furthermore,considering the influence of fault types and frequency security control strategies,an inertia requirement evaluation method and grading mechanism applicable to the security defense lines of power grid frequency are constructed.Finally,taking a provincial power grid in China as a case,the proposed method is used to evaluate and analyze the system inertia requirements,verifying the rationality and effectiveness of the proposed method.