电力系统自动化2024，Vol.48Issue(8)：131-140,10.DOI:10.7500/AEPS20230713004
附加频率控制下并网换流器的动态惯量及其量化评估
Dynamic Inertia of Grid-connected Converter with Additional Frequency Control and Its Quantitative Evaluation
摘要
Abstract
The large-scale integration of renewable energy significantly reduces the inertia of the AC system,and the participation of grid-connected converters in the frequency control has become an important means to improve frequency stability.Based on the transfer function model,the dynamic inertia of grid-connected converter with additional frequency control is derived.It is observed that the dynamic inertia exhibits time-varying characteristics due to the combined influence of inertia design parameters and other control elements.However,simplifying it to a constant similar to the rotational inertia of synchronous generators will lead to analysis errors.Therefore,for the two mainstream grid-connected converter control methods of constant DC voltage control and constant power control,the quantitative evaluation method of dynamic inertia for grid-connected converter with additional frequency control is proposed.The influence mechanisms of different factors such as control parameters,operation conditions,and system characteristics on inertia are analyzed.It is concluded that the outer loop of active power control will significantly change the original design inertia,and it is necessary to focus on the inertia deviation caused by its control parameters.Finally,based on the time-domain simulation model built in Simulink,the correctness and effectiveness of the transfer function model and quantitative evaluation method of inertia are verified.关键词
新能源/并网换流器/频率控制/惯量/量化评估Key words
renewable energy/grid-connected converter/frequency control/inertia/quantitative evaluation引用本文复制引用
陈湘,付强,宾子君,肖先勇,孔祥平..附加频率控制下并网换流器的动态惯量及其量化评估[J].电力系统自动化,2024,48(8):131-140,10.基金项目
国家电网公司科技项目(海上风电柔直并网系统的振荡频率漂移机理与协同抑制研究,4000-202318081A-1-1-ZN). This work is supported by State Grid Corporation of China(Research of oscillation mode drifting and coordinating suppression in power system with offshore wind power integrated via voltage source converter based high voltage direct current transmission,No.4000-202318081A-1-1-ZN). （海上风电柔直并网系统的振荡频率漂移机理与协同抑制研究,4000-202318081A-1-1-ZN）
