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Research on Low Voltage Ridethrough Methods for Flexible DC Converter Stations Connected to the Gathering System of New Energy Base
Liu Haolin, Jia Ke, Bi Tianshu, Niu Houmin, Li Weitao
National Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China

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Abstract  

When the collection line of the flexible direct current (DC) transmission system of a new energy mega-base experiences a fault, the flexible DC converter station may, due to overcurrent blocking, result in the disconnection of the entire connection to the new energy source. To address these issues, this paper, considering the control characteristics of the new energy grid-connected converter, analyzes the necessity of retaining the voltage outer loop during the low penetration control period of the flexible converter station. Subsequently, a method for low-voltage ride-through of the collection system is proposed based on sequence current limitation and equivalent impedance. This involves separating the reference currents output by the outer loop into positive and negative sequences, then transforming them into the three-phase coordinate system to achieve independent processing of the output currents for each phase, thus solving the problem of asymmetrical fault transient overcurrent of the faulted phase. Simultaneously, the paper utilizes the equivalent impedance method to adaptively adjust the reference values of the outer loop voltage, avoiding the drawback of the outer loop control exiting due to saturation after the inner loop current limiting section becomes effective. This helps prevent overcurrent blocking of the flexible DC converter station during the fault steady-state period. The authors constructed a refined model of the AC collection system for the new energy mega-base connected to the flexible converter station in PSCAD and validated the effectiveness of the proposed control method through simulation experiments.

Key wordsRenewable energy base      collection system      low voltage ride trough      equivalent impedance method      inner ring current limiting     
Received: 04 January 2024     
PACS: TM615  
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Liu Haolin
Jia Ke
Bi Tianshu
Niu Houmin
Li Weitao
Cite this article:   
Liu Haolin,Jia Ke,Bi Tianshu等. Research on Low Voltage Ridethrough Methods for Flexible DC Converter Stations Connected to the Gathering System of New Energy Base[J]. Transactions of China Electrotechnical Society, 0, (): 240025-240025.
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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.240025     OR     https://dgjsxb.ces-transaction.com/EN/Y0/V/I/240025
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