Impedance measurement for improved power quality - Part 1: The measurement technique

被引：101

作者：

Sumner, M ^{[1
]}

Palethorpe, B ^{[1
]}

Thomas, DWP ^{[1
]}

机构：

[1] Univ Nottingham, Sch Elect & Elect Engn, Nottingham NG7 2RD, England

来源：

IEEE TRANSACTIONS ON POWER DELIVERY | 2004年 / 19卷 / 03期

基金：

英国工程与自然科学研究理事会;

关键词：

impedance measurement; power quality; power system harmonics;

D O I：

10.1109/TPWRD.2004.829873

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper introduces an improved power system impedance measurement technique. The technique injects a short duration current spike into the supply, and derives the impedance from the measured current and voltage. The method is shown to work extremely well under most conditions, by experimental evaluation using a 45-kVA laboratory prototype. Degradation is observed when a voltage-source-type power-electronic load is connected directly to the measurement equipment. An alternative signal processing strategy, based upon the Prony method is proposed to improve the estimation under these conditions. This method also reduces the overall transient data capture time, thus allowing a faster, online calculation of the impedance.

引用

页码：1442 / 1448

页数：7

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