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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摘要随着新能源并网的占比不断提高,新能源输送通道受到电网结构及线路热稳定极限的限制。为此,提出一种混合型潮流控制器（HPFC）用于灵活、精准调控潮流,平衡潮流分布,提高断面输送能力。HPFC由无源移相器（PST）部分与有源级联H桥换流器（CHBC）部分组合而成,结合了PST调节潮流容量大与CHBC灵敏性高的优点,实现了对潮流的快速精准调节。首先,利用PST阻抗特性分析了潮流与PST挡位之间的非线性耦合关系,并提出一种基于sinh函数的变步长高效求解的迭代算法;其次,对PST有载调压过程进行仿真建模与暂态分析,推导出切换过程中PST输出电压解析式,为实现暂态应力协同控制（TSCC）提供理论基础;再次,针对有源CHBC与无源PST调节区域及速度之间的差异问题,提出一种潮流柔性协同控制策略,实现了暂态应力协同控制,减小了HPFC调控过程中对电网的潮流冲击及换流阀承受的应力集中;最后,基于PSCAD/EMTDC的仿真结果验证了理论分析的正确性及协调控制策略的有效性。

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关键词 ：混合潮流控制器, 移相变压器, 级联H桥换流器, 等值阻抗, 协同控制

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

收稿日期: 2023-10-08

PACS:

TM571

基金资助:国家电网公司总部科技项目资助（5500-202213121A-1-1-ZN）

通讯作者: 杜翔宇, 男,2000年生,硕士研究生,研究方向为混合潮流控制器。E-mail：xiangyudu218@163.com

作者简介: 杨用春, 男,1982年生,博士,讲师,研究方向为柔性交流输电技术、交直流电力变换及电能质量分析与控制。E-mail：yongchunyang@126.com.

引用本文:

杨用春, 杜翔宇, 杨鹏, 赵国亮, 赵成勇. 混合潮流控制器阻抗特性分析及控制策略研究[J]. 电工技术学报, 2024, 39(21): 6720-6733. Yang Yongchun, Du Xiangyu, Yang Peng, Zhao Guoliang, Zhao Chengyong. Analysis of Impedance Characteristics and Control Strategy of Hybrid Power Flow Controller. Transactions of China Electrotechnical Society, 2024, 39(21): 6720-6733.

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