A Circulating Current Interline DC Power Flow Controller for DC Grid

被引：0
|
作者：
Li G. [1 ]
Bian J. [1 ]
Wang H. [1 ]
Wang Z. [1 ]
机构：
[1] Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education, Northeast Electric Power University, Jilin
来源：
Bian, Jing (bj_jjj@163.com) | 1600年 / China Machine Press卷 / 35期
关键词：
AC circulation; DC grid; Interline DC power flow controller; Internal power balance; Nonisolated;
D O I：
10.19595/j.cnki.1000-6753.tces.190299
中图分类号：
学科分类号：
摘要：
Aiming at the problem of insufficient freedegree of power flow control in DC grid, this paper proposes a novel interline DC power flow controller (I-PFC). I-PFC can realize the power balance through the AC circulating current without AC transformer as AC internal pathway. Compared with the existing interline DC power flow controller, it further reduces the current fluctuation caused by charging and discharging of a single capacitor, and has the advantages of avoiding additional resonance, reducing harmonics and expanding easily. Firstly, the topology of I-PFC was proposed, and the method of power flow control was analyzed. Then the relationship between line current and series voltage was obtained, and the principle of power balance using internal AC circulating current was introduced. Secondly, according to the power and energy of I-PFC, the capacitor voltage of sub-module was analyzed in detail. It mainly consisted of DC, fundamental frequency and two frequency doubling components. The control strategy including DC power flow control and power balance control was designed. Finally, a three-terminal ring VSC-HVDC including I-PFC was built in PSCAD/EMTDC. The feasibility and effectiveness of the proposed I-PFC were verified by input operation, reverse regulation and dynamic response. © 2020, Electrical Technology Press Co. Ltd. All right reserved.
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页码：1118 / 1127
页数：9
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