文章摘要
许烽,陆翌,裘鹏,等.向无源网络供电的LCC-MMC混合高压直流输电系统控制策略[J].电力系统自动化. DOI: 10.7500/AEPS20161101013.
XU Feng,LU Yi,QIU Peng, et al.Control Strategies of a LCC-MMC Hybrid HVDC System Connected to Passive Networks[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20161101013.
向无源网络供电的LCC-MMC混合高压直流输电系统控制策略
Control Strategies of a LCC-MMC Hybrid HVDC System Connected to Passive Networks
DOI:10.7500/AEPS20161101013
关键词: 混合直流  电网换相换流器  模块化多电平换流器  解耦控制策略  交流故障穿越
KeyWords: hybrid HVDC  line commutated converter  modular multilevel converter  decoupling control strategy  ac fault ride-through
上网日期:2017-05-19
基金项目:
作者单位E-mail
许烽 国网浙江省电力公司电力科学研究院 xuf_1988@163.com 
陆翌 国网浙江省电力公司电力科学研究院 21010006@zju.edu.cn 
裘鹏 国网浙江省电力公司电力科学研究院 qiupeng5000@163.com 
江道灼 浙江大学电气工程学院 584558726@qq.com 
黄晓明 国网浙江省电力公司电力科学研究院 985422207@qq.com 
摘要:
      LCC-MMC混合直流输电系统兼和了两种换流器的技术优势和经济优势,具有较好的应用前景。无源网络装设容性滤波装置能够起到平滑交流电压波形,提供电压支撑等作用。本文首先通过理论推导,建立了含容性滤波装置的MMC数学模型,基于dq理论提出了MMC的无源解耦控制策略。针对送端LCC侧交流故障可能导致的功率中断等问题,从LCC和MMC的控制机理出发,分析了故障阶段及故障后的系统响应特性,并进而提出了送端交流故障穿越附加控制策略。为验证上述控制策略的有效性,在PSCAD/EMTDC内建立了一个LCC-MMC单极混合直流输电模型。通过受端电压频率变化和送端交流故障仿真,验证了所提出的控制策略的可行性和有效性。
Abstract:
      The LCC-MMC hybrid HVDC system combines the technical and economic advantages of two kinds of converters, and has a good application prospect. The capacitive filtering device installed on the passive network can smooth the ac voltage waveform, provide voltage support, etc. In this paper, the mathematical model of the MMC containing the capacitive filtering device is established through theory deduction firstly, and the decoupling control strategy of the MMC is proposed based on the dq theory. For the problem of power transmission interruption during ac fault at the sending end (LCC), the system fault response characteristics is analyzed from the control mechanism of LCC and MMC, and then the additional control strategy for the sending-end ac fault ride-through is put forward. In order to verify the effectiveness of the control strategies, a LCC-MMC hybrid HVDC transmission model is established in PSCAD/EMTDC. The feasibility and effectiveness of the proposed control strategies are verified by the simulation of the voltage/ frequency variation at the receiving end and the ac fault at the sending end.
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