| 引用本文: | 苏纪豪,曾成碧,苗 虹,等.适用于不同阻抗特性端口的宽频模块化阻抗测量装置设计及控制研究[J].电力系统保护与控制,2025,53(18):142-153. |
| SU Jihao,ZENG Chengbi,MIAO Hong,et al.Design and control of a wideband modular impedance measurement device for ports with different impedance characteristics[J].Power System Protection and Control,2025,53(18):142-153 |
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| 摘要: |
| 为满足电力系统中不同阻抗特性端口的谐波阻抗测量要求，研究了一种模块化阻抗测量装置。所研究的阻抗测量装置包含一个前级整流电路和级联模块化H桥变流器。为实现在宽频带内对不同频率、大小与特性的谐波阻抗进行测量，利用整流器的输出电压变化实现装置输出扰动的幅值调整，在H桥变流器的控制中引入宽频参考信号实现装置输出扰动的频率调整。并在装置的输出端引入负载电阻，根据待测端口阻抗大小，实现谐波电压或电流信号注入的切换，以提升谐波阻抗测量精度。此外，在变流器控制中引入电流前馈以避免背景谐波对装置输出扰动的干扰。最后利用RTDS在线实时仿真验证了该测量装置可灵活实现不同电压等级下的谐波阻抗测量，端口测量范围满足1~5000 Hz，单次的谐波注入带宽可达200 Hz，包含21个谐波频率点。相较于非干预式和传统干预式测量方法，该测量装置测量阻抗结果误差不超过0.5%，满足测量精度要求。 |
| 关键词: 阻抗测量 可变模式注入 宽频谐波扰动注入 整流器控制 级联H桥变流器 电流前馈控制 |
| DOI：10.19783/j.cnki.pspc.241205 |
| 分类号: |
| 基金项目:四川省重点研发项目资助(2022YFG0300)；成都市技术创新项目资助(2022-YF05-00081-SN) |
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| Design and control of a wideband modular impedance measurement device for ports with different impedance characteristics |
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SU Jihao1, ZENG Chengbi1, MIAO Hong1, YANG Xiaobao1, ZHAO Yuxiang1, WANG Dianlang2
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1. College of Electrical Engineering, Sichuan University, Chengdu 610065, China; 2. Qujing Bureau of EHV Power
Transmission Company, China Southern Power Grid Company Limited, Qujing 655000, China
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| Abstract: |
| To meet the requirements of harmonic impedance measurement for ports with different impedance characteristics in power systems, a modular impedance measurement device is studied. The proposed impedance measurement device consists of a front-end rectifier circuit and a cascaded modular H-bridge converter. To realize harmonic impedance measurements across a wide frequency range with varying frequency, magnitude, and characteristics, the rectifier’s output voltage variation is used to adjust the amplitude of the injected disturbance, while a wideband reference signal is introduced into the H-bridge converter control to adjust the disturbance frequency. A load resistor is also introduced at the device output, enabling switching between harmonic voltage or current signal injection according to the impedance of the tested port, thereby improving measurement accuracy. In addition, current feedforward control is applied in the converter to avoid interference from background harmonics on the output disturbance. Finally, real-time RTDS simulations verify that the measurement device can flexibly perform harmonic impedance measurement at different voltage levels, with a measurement range of 1~5000 Hz and a single harmonic injection bandwidth of 200 Hz covering 21 harmonic frequency points. Compared with non-intrusive and conventional intrusive methods, the impedance measurement error of the proposed device is less than 0.5%, satisfying the measurement accuracy requirements. |
| Key words: impedance measurement variable mode injection wideband harmonic disturbance injection rectifier control cascaded H-bridge converter current feedforward control |
