电工技术学报  2020, Vol. 35 Issue (2): 330-336    DOI: 10.19595/j.cnki.1000-6753.tces.181707
电力系统 |
混合双馈入直流系统最大传输功率控制策略研究
丁海龙, 袁志昌, 吴爱军, 田宝烨, 郭佩乾
清华大学电机工程与应用电子技术系 北京 100084
Research on Control Strategy for Maximum Power Transmission in Doubly-Fed Hybrid DC System
Ding Hailong, Yuan Zhichang, Wu Aijun, Tian Baoye, Guo Peiqian
Department of Electrical Engineering Tsinghua University Beijing 100084 China
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摘要 目前,我国南方电网、华东电网等受端负荷中心已经初步形成基于电网换相器型高压直流输电(LCC-HVDC)和柔性直流输电(VSC-HVDC)混合多馈入的格局,直流馈入容量不断增长,直流混合馈入系统将成为我国未来受端电网的常态。为了探究混合多馈系统中LCC和电压源变流器(VSC)的耦合基理,研究混合直流系统传输最大功率的控制策略,该文首先建立混合双馈入直流输电系统数学模型,在考虑设备容量限制、交直流系统稳定约束等边界条件的基础上,提出求解交流电网短路容量变化时双馈系统最大可传输功率的方法。然后结合电网运行控制要求,提出一种离线计算控制策略表、在线辨识电网等效阻抗并查表的控制策略,使得交流系统发生事故后自适应调整直流输电控制模式,从而达到当前工况的最大可传输功率。最后通过PSCAD的数字仿真验证了控制策略的有效性。
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丁海龙
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郭佩乾
关键词 混合双馈入直流系统最大传输功率柔性直流输电控制策略    
Abstract:Currently, the mixed multi-feed pattern of LCC-HVDC and VSC-HVDC initially forms the load center of China Southern Power Grid and East China Power Grid. With the increase of DC feed capacity, DC hybrid feed system will become the normal state of China’s future receiving-end grid. This paper aims to explore the coupling principle of LCC and VSC, and to further research the strategy of the maximum transmission power in doubly-fed system. In this paper, the mathematical model of doubly-fed system was established at first. Furthermore, considering the limitation of equipment capacity and the stability constraints of AC and DC systems, the method for solving the maximum transmission power was proposed when changing the short circuit capacity in the AC network. Then, combined with the power grid operation control requirements, a control strategy for off-line calculation of control strategy table by on-line identification of grid equivalent impedance was presented. Consequently, the AC system could adjust the DC transmission control mode adaptively after an accident, so as to achieve the maximum transferable power of the current working condition. Finally, the doubly-fed system and control strategy were verified based on PSCAD/EMTDC.
Key wordsDoubly-fed hybrid DC system    maximal transmission power    VSC-HVDC    control strategy   
收稿日期: 2018-11-06      出版日期: 2020-01-17
PACS: TM722  
基金资助:国家重点研发计划“超导直流限流器原理、结构设计和高温超导材料研究”项目资助(2017YFB0902301)
通讯作者: 袁志昌 男,1980年生,博士,副研究员,研究方向为柔性交/直流输电技术、电力系统稳定分析与仿真。E-mail: yuanzc@mail.tsinghua.edu.cn   
作者简介: 丁海龙 男,1992年生,硕士,研究方向为直流输电技术与电力系统稳定分析。E-mail: 992996050@qq.com
引用本文:   
丁海龙, 袁志昌, 吴爱军, 田宝烨, 郭佩乾. 混合双馈入直流系统最大传输功率控制策略研究[J]. 电工技术学报, 2020, 35(2): 330-336. Ding Hailong, Yuan Zhichang, Wu Aijun, Tian Baoye, Guo Peiqian. Research on Control Strategy for Maximum Power Transmission in Doubly-Fed Hybrid DC System. Transactions of China Electrotechnical Society, 2020, 35(2): 330-336.
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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.181707          https://dgjsxb.ces-transaction.com/CN/Y2020/V35/I2/330