结合无功自适应调节和改进LADRC策略抑制HPFC全过程过电压控制方法

doi:10.19595/j.cnki.1000-6753.tces.242279

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摘要

混合潮流控制器（HPFC）因具备连续、精确调节潮流等优点,在新型电力系统中应用前景广泛。但在一些故障场景下,其存在过电压问题,影响HPFC设备安全。针对此问题本文提出了一种结合无功功率自适应调节和带宽参数自适应调节的线性自抗扰策略以抑制混合潮流控制器全过程过电压控制方法。首先,从HPFC结构原理出发,分析系统内部功率及过电压特性;然后,基于HPFC内部潮流方程与无功-电压耦合关系,提出自适应无功调控（ARPC）策略;此外,针对过电压抑制初始阶段短时过电压问题,论文通过分析线性自抗扰控制中核心带宽参数与系统输出响应之间的关系,设计一种控制器带宽参数自适应调节的线性自抗扰控制（A-LADRC）方法,以实现全过程过电压抑制。最后,基于RT-LAB实时仿真机和实际控制器,搭建了控制器级硬件在环实验测试平台,验证了所提方法对过电压抑制的有效性和优越性。

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关键词 ：混合潮流控制器, 自适应调节, 线性自抗扰, 过电压抑制

Abstract：

Hybrid Power Flow Controller (HPFC) is an advanced power system device that has garnered significant attention for its potential applications in modern power systems, primarily due to its capability to achieve continuous and precise power flow regulation. However, under the fault scenarios, the HPFC may experience overvoltage issues, which pose a threat to the safe operation of the HPFC device and may compromise the stability of the entire power system. To address this critical challenge, this paper proposes a novel control strategy that integrates linear active disturbance rejection control (LADRC) with adaptive reactive power regulation and adaptive bandwidth parameter regulation, aiming to effectively suppress overvoltage throughout the entire process.
The study begins with an in-depth analysis of the topology and working principle of the HPFC, focusing on the internal power characteristics of the system and the mechanism of overvoltage generation. By examining the power flow relationships within the HPFC system and the coupling between reactive power and voltage, an Adaptive Reactive Power Control (ARPC) strategy is developed. This strategy dynamically regulates reactive power during system faults to effectively mitigate overvoltage. Additionally, to address the potential short-term overvoltage issue at the initial stage of overvoltage suppression, Linear Active Disturbance Rejection Control (LADRC) is introduced to enhance the dynamic response characteristics of the system. Traditional fixed-bandwidth LADRC, however, has limitations in suppressing overvoltage caused by faults. Therefore, this paper further investigates the relationship between the bandwidth parameter of LADRC and its dynamic response characteristics. An improved Linear Active Disturbance Rejection Control method, termed Adaptive LADRC (A-LADRC), is proposed. This method optimizes the bandwidth parameter in real-time based on the difference between the reactive power reference value and the actual output. By dynamically adjusting the controller bandwidth, the proposed method can rapidly suppress overvoltage while maintaining system stability, thereby achieving comprehensive overvoltage suppression.The integration of ARPC and A-LADRC enables coordinated control across all operational stages, from the onset of a fault to its recovery.
Finally, based on RT-LAB real-time simulator and actual controller, a controller level hardware-in-the-loop test platform was built to verify the overvoltage suppression strategy under different fault scenarios. The experiment compares and validates the ARPC combined PI control and the proposed A-LADRC strategy. The experimental results show that the inhibition time of ARPC combined with A-LADRC under different working conditions is shorter, which is 0.11s and 0.12s, and 0.28s and 0.3s under PI control, which is about 50% shorter than that under PI control. In the simulation experiment of fault overvoltage, the short-time overvoltage exists in the initial stage of fault under PI control, which can be effectively avoided by using the proposed A-LADRC. The peak value of overvoltage suppression under PI control is 1.17 and 1.31, and the peak value of overvoltage suppression using the proposed method is 1.09 and 1.02, which shows that the suppression effect is obviously better. The results show that the proposed method can effectively improve the speed of overvoltage suppression, reduce the peak value of overvoltage suppression, and realize the whole process of overvoltage suppression from the control level.

Key words： Hybrid power flow controller Adaptively adjustment Linear active disturbance rejection Overvoltage suppression

收稿日期: 2024-12-18

PACS:

TM86

基金资助:

国网河北省电力有限公司科技项目资助（SGHEJY00SJJS2310140）

通讯作者: 袁新成男,2001年生,硕士研究生,研究方向为新能源并网控制技术。E-mail：18678570769@163.com

作者简介: 孟建辉男,1987年生,博士,高级工程师,研究方向为电力电子技术、新能源发电与电力系统。E-mail：mengjianhui2008@163.com.

引用本文:

孟建辉, 袁新成, 吴鹏, 赵彭辉, 徐岩. 结合无功自适应调节和改进LADRC策略抑制HPFC全过程过电压控制方法[J]. 电工技术学报, 0, (): 250437-. Meng Jianhui, Yuan Xincheng, Wu Peng, Zhao Penghui, Xu Yan. Integrated Control Method for Suppressing Whole-Process Overvoltage in HPFC Systems Combining Reactive Power Adaptive Regulation with Improved LADRC Strategy. Transactions of China Electrotechnical Society, 0, (): 250437-.

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