DocumentCode :
1010774
Title :
Predicting Inverter-Induced Harmonic Loss by Improved Harmonic Injection
Author :
Bradley, Keith ; Cao, Wenping ; Clare, Jon ; Wheeler, Patrick
Author_Institution :
Sch. of Electr. & Electron. Eng., Nottingham Univ., Nottingham
Volume :
23
Issue :
5
fYear :
2008
Firstpage :
2619
Lastpage :
2624
Abstract :
This letter presents an improved harmonic injection method for determination of inverter-induced harmonic power loss across a range of induction motors rated at 1.1, 7.5, 15, and 30 kW. Techniques to obtain the necessary experimental precision and repeatability are investigated in detail. The harmonic injection method allows the machine to be tested under normal operating conditions while a range of selected harmonics are superimposed on the fundamental frequency of the pulse width modulation (PWM) waveform. This technique is validated by direct loss measurement using a specially built calorimeter capable of detecting power loss as low as a few watts in induction motors of up to 30 kW. Comparisons of segregated losses by IEEE 112 method B for the machines operating on sinusoidal and inverter-fed supplies show a good correlation between high frequency PWM harmonic loss and core loss. Core loss is not a constant proportion of total loss for any machine and neither is harmonic loss independent of machine design.
Keywords :
calorimeters; harmonics; induction motors; losses; pulse width modulation; calorimeter; harmonic injection; induction motors; inverter-induced harmonic power loss; power 1.1 kW; power 15 kW; power 30 kW; power 7.5 kW; pulse width modulation waveform; Core loss; Frequency; Induction motors; Loss measurement; Power measurement; Power system harmonics; Pulse width modulation; Pulse width modulation inverters; Space vector pulse width modulation; Testing; Harmonic analysis; induction motors; loss measurement; power conversion harmonics; pulse width modulated inverters; variable speed drives;
fLanguage :
English
Journal_Title :
Power Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/TPEL.2008.2002329
Filename :
4689458
Link To Document :
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