基于改进模态分析法的柔性多端交直流混联系统静态电压稳定性评估

doi:10.19595/j.cnki.1000-6753.tces.201031

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摘要该文基于电压源型换流站的多端交直流（AC/VSC-MTDC）混联系统稳态模型特点,对传统的模态分析法进行了改进,并首次将其应用到AC/VSC-MTDC混联系统的静态电压稳定性分析中。通过将交直流系统进行解耦,可以深入量化分析交流、直流系统之间的相互影响。同时对传统模态分析法的参与因子指标进行改进,首次将一种新的状态-模态指标推广应用到交直流系统中,将临界模态表示为交、直流系统状态的加权和,以评估系统各个状态对临界模态形成的贡献,进而制定相应措施以改善交直流系统的电压稳定性。相比于传统参与因子指标,状态-模态指标还能够考虑有功功率对电压稳定性的影响,从而进一步量化换流站的控制功率改变以及换流站在交流系统连接位置改变时所产生的影响。最后,通过对一个改进IEEE 57节点的交直流系统进行测试与分析,证明该文所提方法及指标的有效性和可行性。

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关键词 ：静态电压稳定性评估, 模态分析法, 电压源型多端直流, 交直流混联系统, 潮流方程

Abstract：Based on the steady-state model characteristics of the AC/VSC-MTDC hybrid system, the traditional modal analysis method is improved and applied to the static voltage stability assessment on the AC/VSC-MTDC hybrid system for the first time. By decoupling AC and DC, the interaction between AC and DC systems can be deeply analyzed. Participation factor index to the traditional modal analysis was improved, for the first time a new state-in-modal index is applied to AC/DC hybrid systems. The critical modes are represented as the weighted sum of the system states, which can clearly reflect the formation process of the critical mode, thus finding the system state’s contribution to the critical mode, so as to take corresponding measures to enhance the voltage stability of AC/DC system. Compared with the traditional participation factor index, the state-mode index can also consider the influence of active power on voltage stability, so as to further quantify the control power change of VSC station and the influence of VSC station when its connecting position to AC system changes. Finally, the validity and feasibility of the proposed method and index are verified by the test and analysis on an improved IEEE 57 AC/DC system.

Key words： Static voltage stability assessment modal analysis voltage source converter-multiple terminal direct current (VSC-MTDC) AC/DC hybrid system power flow equation

收稿日期: 2020-08-14

PACS:

TM712

基金资助:国家杰出青年科学基金（51725701）和国家自然科学基金国际（地区）合作与交流项目（5181101576）资助

通讯作者: 唐俊杰男,1984年生,副教授,博士生导师,研究方向为电力系统不确定性分析,电网安全风险评估与优化管理,交直流电网的建模、运行与规划。E-mail：tangjunjie@cqu.edu.cn

作者简介: 郭小颖女,1995年生,硕士研究生,研究方向为交直流混联系统静态电压稳定性分析。E-mail：guoxiaoying@cqu.edu.cn

引用本文:

郭小颖, 唐俊杰, 舒铜, 彭穗, 谢开贵. 基于改进模态分析法的柔性多端交直流混联系统静态电压稳定性评估[J]. 电工技术学报, 2021, 36(17): 3741-3752. Guo Xiaoying, Tang Junjie, Shu Tong, Peng Sui, Xie Kaigui. Static Voltage Stability Assessment on Hybrid Alternating Current/Voltage Source Converter-Multiple Terminal Direct Current System Using Improved Modal Analysis. Transactions of China Electrotechnical Society, 2021, 36(17): 3741-3752.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.201031 https://dgjsxb.ces-transaction.com/CN/Y2021/V36/I17/3741

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