Evaluation of commutation failure risk in single- or multi-infeed LCC-HVDC systems based on equivalent-fault method
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In single- or multi-infeed line-commutated converter-based high-voltage direct current (LCC-HVDC) systems, commutation failure (CF) induced by alternating current (AC) faults may lead to serious consequences. Considering the randomness of fault occurrences, an accurate evaluation of the CF risk (CFR) from the system point of view becomes necessary in power system planning and operation. This paper first provides a definition of the CF severity (CFS) index corresponding to an AC fault. Then, on the basis of electromagnetic transient (EMT) simulation, an approach to calculate the CFS index considering the randomness of fault-occurrence time is presented. A novel equivalent-fault method is further put forward to make the EMT simulation scalable to calculate the CFS index in terms of a fault occurring in a large-scale receiving-end grid. Thereafter, the CFR index is introduced, which is defined as the sum of the products of the CFS index of each AC fault and the corresponding fault rate. Finally, the proposed method is verified on the modified IEEE 9-bus and modified IEEE 39-bus systems using PSCAD/EMTDC.
Keywordscommutation failure severity equivalent-fault method commutation failure risk fault randomness electromagnetic transient simulations
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- 7.Zheng X, Zhao S, Li M, et al. Using the STATCOM with energy storage to enhance the stability of the AC-DC hybrid system. In: Proceedings of the 5th International Conference on Electric Utility Deregulation and Restructuring and Power technologies. Changsha: IEEE, 2015. 242–247Google Scholar
- 9.Zheng Q Q, Wang X, Fu Y S, et al. A STATCOM compensation scheme for suppressing commutation failure in HVDC. In: Proceedings of the Conference of the IEEE Industrial Electronics Society. Florence: IEEE, 2016. 1081–1086Google Scholar
- 10.Wang L J, Wang G, Li H F, et al. Risk evaluation of commutation failure in multi-infeed HVDC systems under AC system fault conditions (in Chinese). Auto Elect Power Syst, 2011, 35: 9–14Google Scholar
- 12.Chen Z, Zhou B R, Hong C, et al. Critical impedance boundary-based risk assessment on simultaneous faults in multi-infeed DC transmission system (in Chinese). Power System Technol, 2013, 37: 874–878Google Scholar
- 13.Rahimi E, Gole A M, Davies J B, et al. Commutation failure in singleand multi-infeed HVDC systems. In: Proceedings of the 8th IEE International Conference on AC and DC Power Transmission. London: IET, 2006. 182–186Google Scholar
- 14.Kimbark E W. Direct Current Transmission. USA: John Wiley &Sons Press, 1971Google Scholar
- 16.Szechtmam M, Wess T, Thio C V. A benchmark model for HVDC system studies. In: Proceedings of the International Conference on AC and DC Power Transmission. London: IET, 1991. 374–378Google Scholar
- 17.Zhang B M, Chen S S, Yan Z. Advanced Power System Analysis (in Chinese). Beijing: Tsinghua University Press, 2007Google Scholar
- 18.Yu C G, Chen Q, Gao Z J, et al. Fault calculation of AC system interconnected by HVDC system. In: Proceedings of the Innovative Smart Grid Technologies-Asia. Tianjin: IEEE, 2012. 1–6Google Scholar