| 引用本文: | 曾令康,李大虎,姚伟,孙建波,刘佳,文劲宇.适用于背靠背柔性直流输电的双环附加频率控制[J].电力自动化设备,2018,(12): |
| ZENG Lingkang,LI Dahu,YAO Wei,SUN Jianbo,LIU Jia,WEN Jinyu.Dual-loop supplementary frequency control for BTB-VSC-HVDC[J].Electric Power Automation Equipment,2018,(12): |
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| 摘要: |
| 通过背靠背柔性直流输电(BTB-VSC-HVDC)实现异步互联的2个交流系统之间缺乏相互支援的能力，使得各交流系统的频率响应特性下降。为了应对该问题，在理论分析柔性直流输电系统实施附加频率控制(SFC)的可行性的基础上，提出了一种适用于BTB-VSC-HVDC系统的双环SFC策略，使未受扰动端系统参与受扰动端系统的频率响应，实现两端交流系统的相互频率支撑。所提双环SFC策略中，通过在定有功功率控制环上增加频率-有功附加控制为受扰动系统提供频率支撑，改善频率响应的稳态特性；通过在定无功功率控制环上增加频率-无功附加控制以提供虚拟惯量支撑，改善频率响应的暂态特性。分别在含BTB-VSC-HVDC的4机2区域系统和含有渝鄂BTB-VSC-HVDC的实际电网等值简化模型中进行仿真研究，仿真结果验证了所提双环SFC策略能有效地改善受扰动系统频率响应过程的暂态与稳态特性。 |
| 关键词: 背靠背柔性直流输电 异步联网 频率控制 频率支撑 |
| DOI：10.16081/j.issn.1006-6047.2018.12.017 |
| 分类号:TM721.1 |
| 基金项目:国家重点基础研究发展计划(973 计划)资助项目(2014CB247400)；国家自然科学基金资助项目(51577075) |
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| Dual-loop supplementary frequency control for BTB-VSC-HVDC |
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ZENG Lingkang1, LI Dahu2,3, YAO Wei1, SUN Jianbo2, LIU Jia4, WEN Jinyu1
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1.State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China;2.State Grid Hubei Electric Power Company, Wuhan 430077, China;3.School of Electrical and Electronic Engineering, Hubei University of Technology, Wuhan 430068, China;4.School of Information Engineering, Wuhan University of Technology, Wuhan 430070, China
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| Abstract: |
| The two asynchronous AC systems interconnected by BTB-VSC-HVDC(Back-To-Back Voltage Source Converter based HVDC) cannot provide necessary frequency support for each other, which results in reduced frequency response characteristics of each AC system under faults. To address this issue, a dual-loop SFC(Supplementary Frequency Control) strategy for BTB-VSC-HVDC system is proposed with theoretical analysis of its feasibility. The proposed SFC, which includes both active and reactive power-loop(P-loop SFC and Q-loop SFC),ensures that the non-perturbed system can participate in the frequency response of the disturbed system and realizes mutual frequency support of the AC systems at both ends. The P-loop SFC can provide frequency support for the disturbed system during the primary frequency modulation, and hence improving the steady-state characteristics of the frequency response. The Q-loop SFC can provide virtual inertia support to improve the transient characteristics of the frequency response. Simulations are conducted in a 4-machine 2-area benchmark with BTB-VSC-HVDC and an equivalent simplified model of Southwest Power Grid with Hubei Power Grid connecting by Chongqing-Hubei BTB-VSC-HVDC. Results show that the proposed control strategy effectively improves the transient and steady-state characteristics of the frequency response of the perturbed system. |
| Key words: BTB-VSC-HVDC asynchronous interconnection frequency control frequency support |
