Abstract
With more and more MMC-HVDC connected to the AC network, the short-circuit current contributed by converter station should be taken into account when the short-circuit fault occurs at the AC-side. In this paper, the characteristics of short-circuit current contributed by MMC are analyzed and a simple and convenient method to calculate the fault current is proposed. Study shows that the characteristics of short-circuit current depend on the control method that MMC adopted. The development of short circuit current can be divided into transient-state and steady-state stage according to whether the controller responds completely or not. Considering the margin of IGBT, current limiters are set both in inner and outer controller. It can limit the bridge arm current and avoid overload. Therefore, AC-side current will change within the limit value. A practical method for the short-circuit current calculation is proposed based on the controllers and limiters. Through this method, both the symmetrical and asymmetrical fault short-circuit current can be calculated after the controllers enters steady state. The analysis in this paper shows that MMC can be equivalent to the current source at steady-state and participate in the calculation of AC system short-circuit. Finally, the accuracy of the proposed method is verified in the PSCAD simulation.
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Tang G (2010) Voltage source converter based HVDC transmission technology. China Electric Power Press, Beijing
Xu Z, Tu Q, Guan M et al (2012) VSC based HVDC system. Machinery Industry Press, Beijing
Tang G, He Z, Pang H (2013) HVDC engineering technology research, application and development. Autom Electr Power Syst 37(15):3–14
Sharifabadi K, Harnefors L, Nee H-P et al (2016) Introduction to modular multilevel converters. In: Design, control, and application of modular multilevel converters for HVDC transmission systems. IEEE
Lu J, He Z, Zhao C et al (2019) Key technologies and prospects for HVDC transmission network planning. Autom Electr Power Syst 43(02):182–191
Chen H (2007) Research on the control and protection strategy of VSC-HVDC system during the failure of AC system. Zhejiang University, School of Electrical Engineering
Chen X (2012) Research on control and protection strategy of MMC-HVDC during the failure of DC line. North China Electric Power University
Cai X, Zhao C, Pang H et al (2013) HVDC asymmetric fault control based on MMC Euler-Lagrange model. Autom Electr Power Syst 37(17):112–118
Zhao C, Chen X, Cao C et al (2011) DC-side fault control and protection strategy for MMC-HVDC. Autom Electr Power Syst 35(23):82–87
Liu Y, Huang M, et al (2019) Short-circuit current estimation of modular multilevel converter using discrete-time modeling. IEEE Trans Power Electron 34(1):40–45
Wasserrab A, Müller H, Krontiris A (2017) Short-circuit calculation in AC network in case of HVDC stations. Cigré Winnipeg, Canada, 30 Sept–6 Oct B4
Yingbiao LI (2017) The fault characteristics and control strategies of MMC–based HVDC Grid. China Electric Power Research Institute
Bu G, Li Y, Wang S, et al (2017) Analysis of the short-circuit of MMC-HVDC. Proc CESS37 21:6303–6312
Acknowledgements
This work was supported by the Science and Technology Projects of State Grid Corporation of China under Project “Research on coordinated control theory and key technologies for voltage source converter based large-scale renewable energy transmission system”.
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Qin, S., Sun, Y., Yin, R., Zhao, B., Wang, S., Zhao, Y. (2020). A Practical Method to Calculate the AC-Side Short-Circuit Current of MMC-HVDC. In: Xue, Y., Zheng, Y., Rahman, S. (eds) Proceedings of PURPLE MOUNTAIN FORUM 2019-International Forum on Smart Grid Protection and Control. PMF PMF 2019 2021. Lecture Notes in Electrical Engineering, vol 584. Springer, Singapore. https://doi.org/10.1007/978-981-13-9779-0_36
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DOI: https://doi.org/10.1007/978-981-13-9779-0_36
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