Small-signal Modeling and Stability Analysis of Modular Multilevel Converter Based on Virtual Synchronous Generator Control

被引：0
作者：
Huang D. [1 ]
Guo L. [1 ]
Li X. [1 ]
机构：
[1] Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin
来源：
Gaodianya Jishu/High Voltage Engineering | 2020年 / 46卷 / 02期
关键词：
Modular modeling; Modular multilevel converter; Small-signal model; Stability analysis; Virtual synchronous generator control;
D O I：
10.13336/j.1003-6520.hve.20200131038
中图分类号：
学科分类号：
摘要：
This paper focuses on the stability of modular multilevel converter (MMC) using virtual synchronous generator (VSG) control. Firstly, based on the idea of modular modeling, an accurate small-signal stability analysis model of MMC using VSG control is established. Then, the eigenvalues of the two-level simplified model is compared with that of the accurate MMC model, revealing that the simplified model ignores a coupled mode (about 16 Hz) which is affected by both VSG control and circulating current suppression control (CCSC) parameters. Thirdly, the stability of three important modes of external mode (about 2 Hz), coupled mode and internal harmonic mode (about 100 Hz) is analyzed. The stability analysis results show that adjusting the VSG control parameters will increase the damping and stability of external mode and reduce the damping and stability margin of the coupled mode. Therefore, it is necessary to pay attention to the stability of the external mode and coupled mode when optimizing the VSG control parameters. In addition, external mode instability may occur when the power grid is weak, and internal harmonic mode instability may occur when the CCSC parameters are unreasonable. Finally, the stability is compared to that of classical vector control,revealing that there exists no coupled mode under classical vector control, thus the stability of VSG control is better when the power grid is weak. © 2020, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：698 / 708
页数：10
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