带PF校正电容的DVR保护负载谐振现象的研究

The Fifth International Conference on Power Electronics and Drive Systems, 2003. PEDS 2003. Pub Date : 2003-11-17 DOI:10.1109/PEDS.2003.1283015

D. Vilathgamuwa, H. M. Wijekoon, S. Choi

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引用次数: 8

摘要

动态电压恢复器(DVR)的电源电压源阻抗会随着电网结构的变化而发生变化。因此，DVR系统的谐振频率将发生变化，从而导致DVR中的谐波谐振。本文详细研究了带功率因数校正电容的DVR保护负载时可能出现的谐振现象。研究表明，现有的DVR开环控制由于缺乏阻尼和稳定裕度，不能可靠地防止谐波谐振。实验证明，通过合理选择控制器的增益参数，由电流内环和电压外环组成的闭环控制器可以抑制DVR系统中可能出现的谐波谐振。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Investigation of resonance phenomena in a DVR protecting a load with PF correction capacitor

The source impedance of the supply voltage of a dynamic voltage restorer (DVR) may change due to the change of power system grid configuration. Hence the resonance frequency of the DVR system will change and that results in harmonic resonance in the DVR. This paper presents a detailed study on possible resonance phenomena in a DVR protecting a load with power factor correction capacitor. The study reveals that the harmonic resonance cannot be reliably prevented with the existing open-loop control of the DVR due to the lack of damping and stability margin. It is proved that the closed-loop controller consisting inner current loop and outer voltage loop can dampen out possible harmonic resonance in the DVR system by properly selecting the gain parameters of the controller.

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The Fifth International Conference on Power Electronics and Drive Systems, 2003. PEDS 2003.

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