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的不断提高,新能源输送通道受到电网结构及线路热稳极限的限制。为此,该文提出了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档位之间的非线性耦合关系,并提出一种基于Sinh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 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

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, 0, (): 9045-45. 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, 0, (): 9045-45.

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