LCC型双端直流中引出并联FB-MMC功率分支站的混合型多端直流输电系统

发布时间：2018-07-06 18:29

  本文选题：混合直流输电系统 + 并联支路站　； 参考：《电网技术》2016年09期

【摘要】：电网换相型高压直流输电系统(line commutated converter based high voltage direct current,LCC-HVDC)型直流输电系统难以引出功率分支,且多端系统间的电流协调困难。为解决这一问题,方便线路走廊附近的区域供电和可再生能源的接入,提出从LCC型双端直流输电系统中导出一个全桥子模块模块化多电平换流器(full bridge based modular multilevel converter,FB-MMC)功率分支站的混合型多端直流输电系统方案。重点研究了含FB-MMC功率分支站的多端直流系统控制及协调策略,在直流低电压和过调制运行工况下,研究设计了FB-MMC功率分支站的控制策略,并对直流故障穿越策略进行了优化,同时设计了混合直流系统的功率反转策略。最后采用PSCAD/EMTDC对直流故障穿越、功率反转和功率分支站的交流系统故障进行了仿真研究。结果表明,与LCC分支方案相比,FB-MMC方案能够简化多端系统间的协调控制,优化系统整体性能,并能更好地抵抗交流系统故障。
[Abstract]:The power branch of (line commutated converter based high voltage direct current- LCC-HVDC DC transmission system is difficult to elicit, and the current coordination among multi-terminal systems is difficult. To address this problem by facilitating access to electricity and renewable energy in areas near the corridor, This paper presents a hybrid multiterminal DC transmission system scheme for a full-bridge modularized multilevel converter (full bridge based modular multilevel convertor FB-MMC power branch station derived from the LCC-type dual-terminal HVDC transmission system. The control and coordination strategy of multi-terminal DC system with FB-MMC power branch station is studied. The control strategy of FB-MMC power branch station is designed under the condition of low DC voltage and over-modulation, and the strategy of DC fault passing through is optimized. At the same time, the power reversal strategy of hybrid DC system is designed. Finally, PSCAD / EMTDC is used to simulate DC fault traversing, power inversion and AC system fault of power branch station. The results show that the FB-MMC scheme can simplify the coordinated control between multi-terminal systems, optimize the overall performance of the system, and better resist the fault of AC system compared with the LCC branching scheme.
【作者单位】： 西安交通大学电气工程学院;许继电气股份有限公司;厦门大学嘉庚学院;
【分类号】：TM721.1
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本文编号：2103717