Original scientific paper
https://doi.org/10.1080/00051144.2017.1343421
Duty ratio modulation direct torque control of brushless doubly-fed machines
Li Bing
; School of Energy, Power And Mechanical Engineering, North China Electric Power University, Beijing, People’s Republic of China
Liu Shi
; Control and Computer Engineering College, North China Electric Power University, Beijing, People’s Republic of China
Long Teng
; Department of Engineering, University of Cambridge, Cambridge, UK
Zhang Jia
; Electrical Engineering & Energy College, Tianjin Sino-German University of Applied Science, Tianjin, People’s Republic of China
Abstract
For the brushless doubly-fed machine (BDFM), traditional direct torque control (DTC) has many problems such as big output torque ripple and uncertain inverter switch frequency. Based on the analysis of traditional DTC, this paper proposed a new torque control which applied duty
ratio modulation into direct torque control. This new control method can decrease the torque ripple effectively by adding zero voltage in each control cycle. According to the brushless BDFM state equation and the prediction of torque, flux linkage in the next moment and the theory of
electromagnetic torque equals to referenced value at the instant moment in one control cycle, torque ripple can be decreased. Through theoretical analysis and experiments, the proposed control method has all advantages of traditional direct torque control and can decrease torque ripple and flux linkage ripple, which can optimize the performance of direct torque control.
Keywords
BDFM; duty ratio modulation; torque ripple; model predictive control; direct torque control
Hrčak ID:
203418
URI
Publication date:
18.6.2018.
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