Transient Stability Analysis and Design of VSGs with Different DC-Link Voltage Controllers

作     者：Chao Shen Wei Gu Wanxing Sheng Keyan Liu Chao Shen;Wei Gu;Wanxing Sheng;Keyan Liu

作者机构：School of Electrical EngineeringSoutheast UniversityNanjingChina Power Distribution Research DepartmentChina Electric Power Research InstituteBeijing 100192China 

出 版 物：《CSEE Journal of Power and Energy Systems》 (中国电机工程学会电力与能源系统学报（英文）)

年 卷 期：2024年第10卷第2期

页      面：593-604页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 080802[工学-电力系统及其自动化] 08[工学] 

基　　金：supported in part by National Natural Science Foundation of China(grant No.52207190) Funds for International Cooperation and Exchange of the National Natural Science Foundation of China(No.52061635104)。 

主　　题：DC-link voltage dynamics equal area criterion(eac) transient synchronization stability virtual synchronous generator(VSG) 

摘      要：Virtual synchronous control has been widely studied for the advantages of emulating inertia for voltage source converters (VSCs). A constant dc-link voltage is usually assumed in existing literature to estimate transient stability of virtual synchronous generators (VSGs). However, actual power supply in the dc-side of VSGs is limited and different dc-link voltage controllers are needed to achieve power balance between DC side and AC side. Addition of dc-link voltage controller has great influence on transient behavior of VSGs, which has not been investigated by previous research. To fill this gap, this paper gives insights into the effect of dc-link voltage dynamics on transient stability of VSGs. First, two typical kinds of VSGs with dc-link voltage controllers are introduced. Then, mathematical models considering dc-link dynamics are established and the effect of dc-link voltage controllers on transient synchronization stability of VSGs is revealed through equal area criterion (EAC). It is found that dc-link voltage controller would reduce stability margin of VSGs and design-oriented transient stability analysis is carried out quantitively using critical clearing time (CCT). Finally, simulation results are given to validate correctness of theoretical analysis.