中国电机工程学报2024，Vol.44Issue(z1)：215-226,12.DOI:10.13334/j.0258-8013.pcsee.240680
弱、极弱电网场景下构网型变流器调频能力提升技术研究
Research on Improving Frequency Modulation Capability of Grid-forming Converter Under Weak and Extremely Weak Grid Condition
摘要
Abstract
VSG technology has been widely concerned because of its good damping and inertia support characteristics,but it is difficult to suppress the active power transient overshooting and power oscillation caused by the weakening of control performance when the working condition and scene change in the frequency modulation process.The frequency modulation capability is not suitable enough.Based on the existing VSG control units,this paper firstly establishes the VSG small signal model related to multiple control units through theoretical deduction.On this basis,the concept of VSG feasible domain of frequency modulation capability is proposed from aspect of classical control theory,and the influence of virtual inertia,additional damping coefficient,power grid strength and other parameters on VSG dynamic performance and feasible domain is quantitatively analyzed.In order to solve the problem that VSG frequency modulation performance can not be satisfied under different working conditions and scenarios at same time,a frequency modulation capability enhancement strategy based on virtual speed flexible regulation is proposed for extremely weak grid.Finally,simulation is constructed in PSCAD/EMTDC,and the effectiveness of the proposed control strategy is verified.关键词
构网技术/虚拟同步发电机/附加阻尼/弱、极弱电网/调频能力/小信号模型Key words
grid-forming technology/virtual synchronous generator(VSG)/additional damping/weak and extremely weak grid/frequency modulation capability/small signal model分类
信息技术与安全科学引用本文复制引用
赵冬梅,裴建楠,白俊辉,徐辰宇,宋晨铭,刘崇茹..弱、极弱电网场景下构网型变流器调频能力提升技术研究[J].中国电机工程学报,2024,44(z1):215-226,12.基金项目
国家重点研发计划项目(2022YFB2402700) （2022YFB2402700）
国家电网有限公司科技项目(52272222001J).National Key R&D Program of China(2022YFB2402700) （52272222001J）
Science and Technology Project of State Grid Corporation of China(52272222001J). （52272222001J）
