电力建设2024，Vol.45Issue(11)：102-113,12.DOI:10.12204/j.issn.1000-7229.2024.11.009
基于二阶VSG的变换器频率支撑能力评估及提升方法
Evaluation and Improving Method of Frequency Support of Converters Based on Second-Order VSG Section
摘要
Abstract
As the penetration of wind and solar energy generators increases,traditional synchronous generators are being replaced,and their support functions must be implemented using renewable generators.Grid-forming technologies enable renewable generators to support power systems.Focusing on the characteristics of the response process of a grid-forming converter under unbalanced active power disturbances and the limitations in assessing its support capabilities,this paper proposes a method to evaluate the frequency support capability of grid-forming converters by applying a unified motion equation model and optimizing the frequency support functionality.Since the grid-forming converter has a relatively slow primary frequency regulation characteristic,a second-order virtual synchronous generator was designed to improve frequency dynamics using virtual inertia and damping coefficients.Time-domain simulations conducted in MATLAB/Simulink verified that the second-order virtual synchronous generator enhances the frequency support capability of grid-forming converters and system frequency dynamics.关键词
构网型变换器/频率支撑/运动方程模型/虚拟同步机/频率动态Key words
grid-forming converter/frequency support/motion equation model/virtual synchronous generator/frequency dynamic分类
信息技术与安全科学引用本文复制引用
刘彦军,何维,朱东海,黄伟,李文云,翟苏巍,方一凡..基于二阶VSG的变换器频率支撑能力评估及提升方法[J].电力建设,2024,45(11):102-113,12.基金项目
This work is supported by National Natural Science Foundation of China(No.52277180)and the Science and Technology Project of China Southern Grid Co.,Ltd.(No.YNKJXM2022036).国家自然科学基金项目(52277180) （No.52277180）
中国南方电网有限责任公司创新项目(YNKJXM2022036) （YNKJXM2022036）
