NDLI: A New Integrator for Voltage Model Flux Estimation in a Digital DTC System

Content Provider	IEEE Xplore Digital Library
Author	Zhang Xing Qu Wenlong Lu Haifeng
Copyright Year	2006
Description	Author affiliation: Dept. of Electr. Eng., Tsinghua Univ., Beijing (Zhang Xing; Qu Wenlong; Lu Haifeng)
Abstract	This paper presents a new solution, which can completely remove the DC offset and compensate the steady-state error for voltage model flux estimation in an induction motor (IM) direct torque control (DTC) system. The voltage model flux estimator has been paid more attention for its clear concept and simple signal processing, however, the integration drift associated with the inherent initial value error and DC offset input, especially in low speed region, can not be completely eliminated by the conventional low-pass-filter (LPF), in addition, LPF also brings steady-state amplitude and phase errors. Based on Bode plots analysis of some existing integrators, a new integrator with a first- order LPF and a high-pass-filter (HPF) in series is proposed to replace the pure integrator. The filters have adaptive cutoff frequency so as to suit various conditions. With the time phasor method, an error compensation formula is derived, which makes it simpler and easier for the new integrator to be applied to the digital control system. The new integrator with error compensation not only completely eliminates the integration drift, but also realizes errorless flux estimation in steady state. Both the simulation and experimental results on a prototype of 4 kW IM DTC system show that the performance of the system especially in low speed region has been improved remarkably. This also verifies the effectiveness of the new integrator
Starting Page	1
Ending Page	4
File Size	4699507
Page Count	4
File Format	PDF
ISBN	1424405483
DOI	10.1109/TENCON.2006.344023
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-11-14
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage Steady-state Error compensation Error correction Induction motors Torque control Amplitude estimation Phase estimation Signal processing Adaptive filters
Content Type	Text
Resource Type	Article

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