混合潮流控制器阻抗特性分析及控制策略研究

doi:10.19595/j.cnki.1000-6753.tces.231653

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Abstract

With the continuous increase of the proportion of new energy connected to the grid, the new energy transmission channel is limited by the grid structure and the thermal stability limit of the line. Therefore, a hybrid power flow controller (HPFC) is proposed for flexible and precise control of power flow, balanced power flow distribution, and improved cross-section conveying capacity. HPFC is composed of passive phase shifter (PST) part and active cascade H-bridge converter (CHBC) part, which combines the advantages of large power flow capacity of PST regulation and high sensitivity of CHBC to achieve fast and precise regulation of power flow. Firstly, the nonlinear coupling relationship between the power flow and the PST gear is analyzed by using the PST impedance characteristics, and an iterative algorithm based on Sinh variable step size is proposed. Secondly, the simulation modeling and transient analysis of the PST on-load voltage regulation process are carried out, and the analytical formula of PST output voltage during the switching process is derived, which provides a theoretical basis for the realization of transient stress collaborative control (TSCC). Aiming at the difference between the adjustment area and speed of active CHBC and passive PST, a flexible power flow collaborative control strategy is proposed, which realizes the transient stress collaborative control and reduces the power flow impact on the power grid and the stress concentration problem of the converter valve during the HPFC regulation process. Finally, the simulation results based on PSCAD/EMTDC verify the correctness of the theoretical analysis and the effectiveness of the coordinated control strategy.

Key words： Hybrid power flow controller phase shift transformer cascade H-bridge converter equivalent impedance collaborative control

Received: 08 October 2023

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TM571

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	Articles by authors
	Yang Yongchun
	Du Xiangyu
	Yang Peng
	Zhao Guoliang
	Zhao Chengyong

Cite this article:

Yang Yongchun,Du Xiangyu,Yang Peng等. Analysis of Impedance Characteristics and Control Strategy of Hybrid Power Flow Controller[J]. Transactions of China Electrotechnical Society, 0, (): 9045-45.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.231653 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/9045

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