NDLI: Current controller for low harmonic distortion and low switching frequency

Content Provider	IEEE Xplore Digital Library
Author	Aldabas, E. Romeral, L. Arias, A. Moreno, J.M. Jayne, M.G.
Copyright Year	2003
Description	Author affiliation: Dept. of Electron. Eng., Univ. Politecnica de Catalunya, Spain (Aldabas, E.; Romeral, L.; Arias, A.; Moreno, J.M.)
Abstract	In this work a new digital current controller for three phases loads is proposed. It uses a modulation between active and null VSI (voltage source inverter) states in order to minimize both switching frequency and harmonic distortion. The controller has been developed using polar coordinates instead of alpha-beta coordinates in order to obtain a circular area, defined by the hysteresis border, for the current error trajectories. The active vectors are applied to achieve the strongest opposition to the back-EMF. The total back-EMF trend is always determined under a null vector application. During an active state, a feed-forward calculation of the current error trajectory under null vectors is continuously calculated. As this calculation considers the back-EMF trend, it is possible to find the longest trajectory of the current error when the new null vector will be applied. Then, when the longest trajectory is found the system will switch from the active to the null state without waiting for the hit on the hysteresis border. This controller not only minimizes the total harmonic distortion but also the switching frequency. A qualitative analysis has been carried out, showing the robustness of the controller in front of both exogenous and endogenous perturbations. Simulations confirm the behaviour expected from the proposed current controller.
Sponsorship	China Electrotechnical Soc. Chinese Soc. for Electrical Eng. Korean Inst. of Electrical Eng. Nat. Natural Sci. Found. of China
Starting Page	642
Ending Page	645
File Size	253735
Page Count	4
File Format	PDF
ISBN	750626210X
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-11-09
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	International Academic Publishers/World Publishing Corporation
Subject Keyword	Harmonic distortion Switching frequency Hysteresis Switches Digital control Voltage Inverters Error correction Feedforward systems Total harmonic distortion
Content Type	Text
Resource Type	Article

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