AC Impedance Modeling and Stability Analysis of Bipolar MMC-HVDC System With Double U/f Droop Control

被引：0
作者：
Li P. [1 ]
Wang Y. [1 ]
Feng B. [1 ]
Xue Y. [2 ]
Liu Y. [1 ]
Li R. [1 ]
机构：
[1] State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Shaanxi Province, Xi’an
[2] State Grid Economic and Technological Research Institute Co., Ltd., Changping District, Beijing
来源：
Dianwang Jishu/Power System Technology | 2024年 / 48卷 / 03期
关键词：
bipolar connection; constant U/f-P/Q control; double U/f droop control; impedance modeling; islanded PMSG-based wind farm; modular multilevel converter; stability analysis;
D O I：
10.13335/j.1000-3673.pst.2022.2529
中图分类号：
学科分类号：
摘要：
The bipolar connection is always adopted in the modular multilevel converter-based high voltage direct current (MMC-HVDC) system to improve the power capacity and system reliability. However, researches on the stability of MMC-HVDC systems with wind farm integration focus mostly on the monopolar connection mode, and the stability of the bipolar MMC-HVDC system with different coordinated controls is still worth further studying. This paper develops the equivalent SISO impedance models of the bipolar MMC-HVDC system with the double U/f droop control and the constant U/f-P/Q control respectively, considering the effects of frequency coupling, the initial phase of the reference frame, and the dc side couplings. Then, the influence of the metallic return and the power distribution between two MMC stations is analyzed in detail. Furthermore, a contrastive study between the effects of the two bipolar coordinated control methods on the ac side negative-resistance features and the stability of the interconnected system is carried out, including on the common and special control loops in the two control strategies. Finally, the detailed time-domain simulation results in the Matlab/Simulink and the real-time hardware-in-the-loop results of a bipolar MMC-HVDC system with the PMSG-based wind farm integration under the two coordinated control strategies verify the accuracy of the proposed impedance models and effectiveness of the stability analysis conclusions. © 2024 Power System Technology Press. All rights reserved.
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页码：1214 / 1223
页数：9
相关论文
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