Estimation of phase currents from a DC-link current sensor using space vector PWM method

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The single-current sensor technique obtaining three phase currents from only a DC-link current sensor has been applied to reduce the cost and increase the reliability for various voltage-fed PWM inverters; however, in this technique there are some practical problems, such as unreliable detection of phase currents and phase shift. A new method that overcomes these problems by employing the estimation scheme with identified system parameters is proposed. The Space Vector PWM (SVPWM) strategy is modified to generate the switching pattern, adequate for the proposed method. To obtain a good detection in spite of parameter uncertainties, system parameters used in the estimation method are identified using a recursive feast square method (RLSM). Experimental results show that the proposed scheme not only provides a very good detection method for three phase currents without current sensors, but also identifies system parameters very well. This proposed method is very simple, has a small detection error, and gives the information on system parameters.
Publisher
HEMISPHERE PUBL CORP
Issue Date
2000-11
Language
English
Article Type
Article
Keywords

INVERTERS

Citation

ELECTRIC MACHINES AND POWER SYSTEMS, v.28, no.11, pp.1053 - 1069

ISSN
0731-356X
URI
http://hdl.handle.net/10203/77549
Appears in Collection
EE-Journal Papers(저널논문)
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