考虑电流限幅的跟网型变流器暂态电压稳定分析与自适应电流限幅控制方法

doi:10.19595/j.cnki.1000-6753.tces.251759

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Abstract

When the grid-following (GFL) converter enters the current limitation control mode under large disturbances, the dynamic characteristics of the renewable energy generator (REG) and the transient characteristics of REG’s terminal voltage is profoundly changed, which results in the invalidity of the existing transient voltage instability mechanism that ignores the current limitation control mode, making it difficult to effectively guide the design of the REG’s transient voltage stability control strategy. At present, the numerical simulation and artificial intelligence-based methods are mostly utilized to analyze the transient voltage stability of the REG-integrated system. However, the engineering experience criteria and the deep learning algorithms lack interpretability and generalization, which cannot provide the sufficiently theoretical perspectives for understanding the essence of the transient voltage collapse. To avoid the misjudgment of the transient voltage stability of the REG integrated system, it is urgent to reveal the voltage instability mechanism considering the current limitation control mode of REGs, and then propose an effective transient voltage stability control strategy. Therefore, when the REG enters the current limitation control mode under severe grid faults, the transient characteristics of the REG under DC voltage control is analyzed in this paper, and the effect of current limitation on the transient voltage stability is investigated. On this basis, the current limitation operation range of REGs under transient voltage stability constraints is quantified, and the current magnitude corresponding to the static stability limit of the system is used as the current limitation of REGs, whose rationality is demonstrated in detail. Afterwards, a novel adaptive current limitation control method based on the real-time measurement results of active power and active current is proposed, which effectively improves the transient voltage stability of the REG-integrated system. Finally, the effectiveness of the proposed voltage instability mechanism and control method is validated based on the electromagnetic transient simulation software PSCAD/EMTDC.
The following conclusions can be drawn from the simulation analysis: (1) When the GFL converter enters the current limitation control mode, its active power is independent of its active current, and both larger or smaller current limitation value may cause the active power of REGs to be less than the active power from its DC side. Therefore, the DC voltage of the GFL converter continuously increases and the grid AC voltage drop during fault recovery process, which induces the transient voltage instability. (2) The active power of the REG after entering the current limitation mode becomes larger with the increase of grid strength and the reactive power gain of REGs. Therefore, a strong grid with enough reactive power injection under large disturbances indicates that the transient voltage stability margin of the system is large. (3) When the static stability limit of a REG-integrated system is larger than the active power from DC side of REGs, the system can operate at its static stability limit under a reasonable current limitation value. On this basis, an adaptive current limitation control method is proposed to simultaneously guarantee the transient voltage stability and the transient synchronous stability of the REG-integrated system.

Key words： Transient voltage stability grid-following (GFL) converter current limitation transient voltage stability margin adaptive current limitation control

Received: 30 September 2025

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TM712

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	Liu Xinyu
	Shan Yongpeng
	Yu Yu
	Xin Huanhai
	Liu Hao

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Liu Xinyu,Shan Yongpeng,Yu Yu等. Transient Voltage Stability Analysis of Grid Following Converters Considering Current Limitation and Adaptive Current Limiting Control Method[J]. Transactions of China Electrotechnical Society, 0, (): 20251759-.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.251759 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/20251759

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