电力建设2024，Vol.45Issue(4)：66-76,11.DOI:10.12204/j.issn.1000-7229.2024.04.007
考虑内外环交互作用的VSG并网振荡特性
Characteristics of VSG Grid-Connected System Oscillation Considering the Interaction Between Inner and Outer Loops
摘要
Abstract
The dynamic characteristics and stability mechanism of a VSG grid-connected system are not sufficiently clear because of the interaction between the different timescale controls of the VSG.A time constant was selected as the leading feature to solve this problem.The critical factors influencing the interaction between the inner and outer rings were extracted,and a reduced-order model of a VSG grid-connected system was established.The established reduced-order model was further linearized at the equilibrium point to obtain a similar Heffron-Phillips stability analysis model.Based on the damping torque method,the oscillation characteristics of the VSG grid-connected system at different inner loop control parameters and grid strengths were analyzed.The oscillation modes introduced by the interaction between the inner and outer loops and the electromagnetic transient interaction of the line and its key influencing factors were further analyzed.Finally,a model was established in Matlab/Simulink,and the effectiveness of the reduced-order model and the correctness of the theoretical analysis of VSGgrid-connected oscillation characteristics,considering the interaction between the inner and outer loops,were verified.关键词
虚拟同步/多时间尺度/降阶模型/内外环交互作用/次同步振荡Key words
virtual synchronization/multiple time scales/reduced-order model/inner-outer loop interaction/subsynchronous oscillation分类
信息技术与安全科学引用本文复制引用
李琳,张晓楠,李庚银,蔡德福,孙冠群..考虑内外环交互作用的VSG并网振荡特性[J].电力建设,2024,45(4):66-76,11.基金项目
This work is supported by National Key R&D Program of China(No.2021YFB2400800)and State Grid Corporation of China Research Program(No.5100-202199536A-0-5-ZN).国家重点研发计划项目(2021YFB2400800) （No.2021YFB2400800）
国家电网公司总部科技项目(5100-202199536A-0-5-ZN) （5100-202199536A-0-5-ZN）
