| 引用本文: | 倪斌业,向往,鲁晓军,文劲宇.基于状态反馈附加阻尼控制的柔性直流电网抑制低频振荡[J].电力自动化设备,2019,39(3): |
| NI Binye,XIANG Wang,LU Xiaojun,WEN Jinyu.Low-frequency oscillation suppression using flexible DC grid based on state feedback supplementary damping control[J].Electric Power Automation Equipment,2019,39(3): |
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| 摘要: |
| 为了提升交直流互联系统的动态稳定性，研究了利用多端柔性直流输电系统阻尼交流系统低频振荡的方法。分析了柔性直流电网接入后系统的振荡模态，研究了直流电网对交流系统稳定性的影响，并基于全维状态空间反馈设计了柔性直流系统的附加阻尼控制器。系统振荡时该附加阻尼控制器能够输出附加控制量，调节各换流站的有功功率，从而抑制系统的振荡。以含有四端柔性直流电网的新英格兰10机系统为例进行了仿真研究，仿真结果表明，引入了该控制器的柔性直流电网能够很好地抑制原系统的低频振荡，改善系统的动态性能。 |
| 关键词: 直流电网 低频振荡 交直流互联电网 小干扰分析 附加阻尼控制 |
| DOI：10.16081/j.issn.1006-6047.2019.03.007 |
| 分类号:TM721.1 |
| 基金项目:国家自然科学基金智能电网联合基金资助项目(U1766211) |
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| Low-frequency oscillation suppression using flexible DC grid based on state feedback supplementary damping control |
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NI Binye, XIANG Wang, LU Xiaojun, WEN Jinyu
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State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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| Abstract: |
| To improve the dynamic stability of AC/DC interconnected system, an approach that uses VSC-MTDC(Voltage Source Converter based Multi-Terminal Direct Current) to damp low-frequency oscillations is proposed. The oscillation mode of AC/DC system is analyzed, and the influences of DC grids on the stability of AC grids are studied. Based on the modal analysis, supplementary damping controller of VSC-MTDC is designed. This controller can output supplementary control signals and regulate the active power of each converter during oscillation to suppress the system oscillation. Simulations are carried on New England 10-machine power system with four-terminal DC grid. Test results indicate that the proposed controller damps the low-frequency oscillation and improves the system dynamic performance. |
| Key words: DC grid low-frequency oscillation AC/DC interconnected system small-signal analysis supplementary damping control |
