接入新能源大基地汇集系统的柔直换流站低电压穿越方法研究

doi:10.19595/j.cnki.1000-6753.tces.240025

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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 words： Renewable energy base collection system low voltage ride trough equivalent impedance method inner ring current limiting

Received: 04 January 2024

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	Articles by authors
	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