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 rapid development and large-scale application of new energy power generation technology, the rapid development of renewable energy (such as wind energy, solar energy) and large-scale grid connection, the capacity of new energy power generation has grown rapidly, but the capacity of new energy transmission to the power grid is limited by the structural characteristics of the power grid itself and the thermal stability limit of the transmission line, which hinders the transmission capacity. In order to solve this problem, this paper proposes a hybrid power flow controller (HPFC) for flexible and accurate regulation of power flow, balancing the power flow distribution of power grid lines, and improving the cross-section transportation capacity. HPFC is a combination of the more common passive phase-shifting transformer (PST) and the active cascaded H-bridge converter (CHBC) power electronics, which connects the CHBC in series on the low-voltage side of the excitation transformer part of the PST, combining the advantages of large power flow capacity of PST regulation and high sensitivity of CHBC, so as to achieve accurate, fast and large-capacity regulation of power flow. In order to improve the efficiency of the solution, an iterative algorithm based on Sinh is proposed to solve the problem with variable step size, which greatly saves the simulation time. Secondly, the process of on-load voltage regulation of PST is analyzed in detail, the simulation model is established, the analytical formula of the output voltage in the process of PST switching is derived, and the theoretical results are compared with the simulation results, which verifies the accuracy of the theory and provides a theoretical basis for the subsequent transient stress cooperative control (TSCC). Thirdly, aiming at the difference between the regulation area and speed of active CHBC and passive PST, a flexible collaborative control strategy for power flow was proposed, which realized the cooperative control of transient stress, reduced the power flow impact on the power grid and the stress concentration of the converter valve in the process of HPFC regulation, realized the smooth regulation of power flow, ensured the stability of the power grid, and effectively protected the device to improve the ability of HPFC to withstand overvoltage and overcurrent. Finally, the simulation model of HPFC power flow control is built in PSCAD/EMTDC simulation software, and the simulation results verify the ability of PST and CHBC to change the power flow and the effectiveness of the flexible collaborative control strategy of power flow, which can ensure the safety and reliability of the device while regulating the power flow.

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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	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, 2024, 39(21): 6720-6733.

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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/Y2024/V39/I21/6720

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