Research on Stability of Electrified Railway Train-Network Coupling System Based on Improved Forbidden Region Criterion
Jin Cheng1, Wang Xiaojun1, Yao Chao1, Bi Chengjie2
1. School of Electrical Engineering Beijing Jiao Tong Univercity Beijing 100044 China; 2. State Grid Beijing Fengtai Power Supply Company Beijing 100073 China
Abstract In recent years, low-frequency oscillations of train-network coupling have occurred frequently in the country's railway hubs. Due to the complex structure of trains and the confidentiality of model parameters, detailed modeling of the train-network coupling system stability are difficult in practice. The impedance method can avoid these problems by measuring the impedance of the train network, and has a good application future. For the train network coupling system, how to reduce the conservativeness of the stability criterion is the key to the stability judgment of the impedance method. In this paper, according to the Nyquist criterion, the criterion forbidden region was improved from the unit circle area to the ray area, and a more conservative improved forbidden region criterion was proposed. Firstly, by researching the CRH5 model, a small signal model of the system was established, and the influencing factors of stability were analyzed. On this basis, the criterion based on port impedance and admittance matrix was proposed in combination with the Gaelic circle theorem. Finally, through the established small signal model, the stability identification results of the improved forbidden region criterion and other criterion were analyzed, and the accuracy of the criterion was verified by simulation.
Jin Cheng,Wang Xiaojun,Yao Chao等. Research on Stability of Electrified Railway Train-Network Coupling System Based on Improved Forbidden Region Criterion[J]. Transactions of China Electrotechnical Society, 2021, 36(21): 4459-4469.
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2021, Vol. 36 
