Static Voltage Stability Assessment on Hybrid Alternating Current/Voltage Source Converter-Multiple Terminal Direct Current System Using Improved Modal Analysis
Guo Xiaoying1, Tang Junjie1, Shu Tong2, Peng Sui3, Xie Kaigui1
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China; 2. Hubei Electric Engineering Corporation Wuhan 430040 China; 3. Grid Planning and Research Center of Guangdong Power Grid Corporation Guangzhou 510699 China
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.
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2021, Vol. 36 
