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1.南京理工大学自动化学院,江苏省南京市 210094
2.东南大学电气工程学院,江苏省南京市 210096
季振东(1986—),男,博士,副研究员,硕士生导师,主要研究方向:电力电子技术在电力系统中的应用。E-mail:zhendong_ji@njust.edu.cn
朱述超(1998—),男,通信作者,硕士研究生,主要研究方向:模块化多电平直流变压器。E-mail:zhushuchao@njust.edu.cn
许光强(1998—),男,硕士研究生,主要研究方向:大功率电力电子技术。E-mail:xuguangqiang@njust.edu.cn
收稿:2024-06-22,
修回:2024-11-20,
网络出版:2025-01-26,
纸质出版:2025-05-10
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季振东,朱述超,许光强等.基于PRBS的中压直流系统宽频阻抗测量装置及其控制[J].电力系统自动化,2025,49(9):199-207.
JI Zhendong,ZHU Shuchao,XU Guangqiang,et al.Wide-band Impedance Measurement Device for Medium-voltage DC Systems and Its Control Based on Pseudo-random Binary Sequence[J].Automation of Electric Power Systems,2025,49(9):199-207.
季振东,朱述超,许光强等.基于PRBS的中压直流系统宽频阻抗测量装置及其控制[J].电力系统自动化,2025,49(9):199-207. DOI: 10.7500/AEPS20240622003.
JI Zhendong,ZHU Shuchao,XU Guangqiang,et al.Wide-band Impedance Measurement Device for Medium-voltage DC Systems and Its Control Based on Pseudo-random Binary Sequence[J].Automation of Electric Power Systems,2025,49(9):199-207. DOI: 10.7500/AEPS20240622003.
随着直流系统中电力电子化程度的加深,电力电子装置的端口阻抗特性对系统稳定性产生了一定影响。为了获取中压直流系统的阻抗特性用以评估系统稳定性,文中对宽频阻抗测量装置展开了研究。首先,以伪随机二进制序列(PRBS)作为输出扰动测量信号,提出了一种混合子模块级联多电平拓扑的阻抗测量装置;然后,在此基础上提出了基于子模块分类的集中式调制方法,通过子模块4种工作模式的划分和配合来实现PRBS信号的高质量输出,实现子模块电容电压均衡,有利于降低开关损耗,并设计了相关主电路参数的计算原则。最后,硬件在环仿真结果验证了所提控制方法的有效性,表明所提阻抗测量装置具备良好的输出效果,能够在满足阻抗测量需求的前提下提高测量效率。
With the deepening of power electronization in the DC system
the port impedance characteristics of power electronic devices have a certain impact on the system stability. To obtain the impedance characteristics of the medium-voltage DC system for the system stability evaluation
this paper studies the wide-band impedance measurement device. First
the pseudo-random binary sequence (PRBS) is used as the output perturbation measurement signal
and an impedance measurement device with cascaded multi-level topology of hybrid sub-modules is proposed. On this basis
a centralized modulation method based on the sub-module classification is proposed
which realizes the high-quality output of PRBS signals through the division and cooperation of four working modes of the sub-modules. The capacitor voltage equalization of the sub-modules can be achieved
which is conducive to reducing the switching loss. The calculation principle of the relevant main circuit parameters is designed. Finally
the hardware-in-the-loop simulation result verifies the effectiveness of the proposed control method
which shows that the proposed impedance measurement device has a good output effect and can improve the measurement efficiency under the premise of meeting the requirements of impedance measurement.
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