Coordinated Control of Power and Current of MMC-HVDC and Circulation Suppression in Unbalanced Power Grid

被引：0

作者：

Pan, Hongbin ^{[1
]}

Zhang, Jiale ^{[1
]}

Deng, Cheng ^{[1
]}

Ruan, Haohao ^{[1
]}

Ma, Shixiang ^{[1
]}

机构：

[1] Xiangtan Univ, Coll Automat & Elect Informat, Xiangtan, Peoples R China

来源：

2020 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) | 2020年

基金：

中国国家自然科学基金;

关键词：

modular multilevel converter; complex resonance controller; general calculation instruction; unbalanced fault; circulating current; MULTILEVEL; SYSTEM;

D O I：

暂无

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

During the operation of the modular multilevel converter (MMC) for the high-voltage direct current (HVDC) transmission system, the negative sequence component will be generated when an unbalanced fault occurs in the grid, which will cause fluctuations in active and reactive power and the circulating current will flow through the bridge arm. Based on complex resonance controllers (CRC), this paper firstly proposes a fast and accurate separation technology for the positive and negative sequence voltages. Secondly, in order to control three objectives of negative sequence current, active power and reactive power fluctuations flexibly and harmoniously, a general positive and negative sequence current calculation instruction by adjusting its trade-off coefficient in the alpha-beta frame is used. Thirdly, a circulating current suppressor based on resonant vector controllers (RVC) is presented to reduce the loss of MMC. Finally, the effectiveness of the proposed strategy is verified by the simulation results.

引用

页码：3420 / 3427

页数：8

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