A stator flux estimation method for direct torque linear control of electrical excitation flux-switching generator

2014 ◽  
Author(s):  
Yu Wang ◽  
Zhiquan Deng
Keyword(s):  
Estimation Method ◽  
Linear Control ◽  
Electrical Excitation ◽  
Flux Estimation ◽  
Stator Flux

A New Stator Flux Estimation Method for Direct Torque Control of Electrical Excitation Flux-Switching Generator

2014 ◽  
Vol 619 ◽  
pp. 292-297
Author(s):  
Yu Wang ◽  
Zhi Quan Deng
Keyword(s):  
Coordinate Transformation ◽  
Dynamic Performance ◽  
Estimation Method ◽  
Voltage Regulation ◽  
Second Order ◽  
Torque Control ◽  
Electrical Excitation ◽  
Flux Estimation ◽  
Hp Filter ◽  
Stator Flux

The electrical excitation flux-switching (EEFS) machine, which exhibits advantages including high reliability, good flux regulation capability, bipolar flux linkage and sinusoidal back-EMF, is suitable for use as a generator in DC power systems. In this paper, a direct power control (DPC) scheme is investigated for voltage regulation of the EEFS generator in order to improve the dynamic performance. However, the stator flux estimation accuracy will affect torque control quality. Hence, a simple and practical stator flux estimation method, which only contains a second-order low pass (LP) filter, a high pass (HP) filter and a simple coordinate transformation module, is proposed for the DPC scheme of the EEFS generator. In this estimation method, the HP filter can completely filter out the DC drift in the back-EMF, and the leading phase produced by the second-order LP filter and HP filter can be compensated by the coordinate transformation module. Hence, at any synchronous angular frequency, the amplitude-frequency and phase frequency characteristics of the new estimation method are same as those of the pure integrator, while DC gain of this method is zero. The DPC scheme of the EEFS generator using this estimation method exhibits good dynamic performance, which is verified by experimental results.

A Stator Flux Estimation Method Based on Duty Cycles of Inverter Switching

2011 ◽  
Vol 383-390 ◽  
pp. 4932-4937
Author(s):  
Yi Feng Wu ◽  
Zhi Quan Deng ◽  
Yu Wang
Keyword(s):  
Fault Tolerant ◽  
Voltage Drop ◽  
Estimation Method ◽  
Cost Effective ◽  
Duty Cycles ◽  
Terminal Voltage ◽  
Flux Estimation ◽  
Two Phases ◽  
Stator Flux ◽  
Stator Resistance

This paper presents a stator flux estimation method based on duty cycles of inverter switching. The stator flux is calculated by integrating the back electromotive force, which is the terminal voltage minus the voltage drop on the stator resistance. The terminal voltage mentioned above is calculated by the duty cycles of inverter switching and dc link voltage, while the duty cycles is derived in the digital control system of induction motor based on the DSP. Without employing voltage sensors to measure phase voltage, the proposed flux estimation method is cost effective and error reducing. The method is also effective in fault-tolerant operation when the motor works with two phases. Experimental results verify the effectiveness of the proposed method.

A strategy for induction motor stator flux estimation using neural networks

2007 ◽  
Author(s):  
Victor P.B. Aguiar ◽  
Ricardo S. The Pontes ◽  
Arthur P.S. Braga ◽  
Jose Sergio de Aguiar
Keyword(s):  
Neural Networks ◽  
Induction Motor ◽  
Flux Estimation ◽  
Stator Flux

scholarly journals Improved Close Loop Stator Flux Estimation of Direct Torque Control Drive

2012 ◽  
Vol 38 ◽  
pp. 572-577
Author(s):  
Hassan Farhan Rashag ◽  
S.P. Koh ◽  
Ahmed N. Abdalla ◽  
Nadia M.L. Tan ◽  
K.H. Chong ◽  
...  
Keyword(s):  
Direct Torque Control ◽  
Torque Control ◽  
Flux Estimation ◽  
Stator Flux

Improved Stator Flux Estimation for Direct Torque Control of Induction Motor Drives

2016 ◽  
Vol 7 (4) ◽  
pp. 1049
Author(s):  
Yahya Ahmed Alamri ◽  
Nik Rumzi Nik Idris ◽  
Ibrahim Mohd. Alsofyani ◽  
Tole Sutikno
Keyword(s):  
Induction Motor ◽  
Cutoff Frequency ◽  
Direct Torque Control ◽  
Motor Drives ◽  
Torque Control ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Flux Estimation ◽  
Stator Flux

<p>Stator flux estimation using voltage model is basically the integration of the induced stator back electromotive force (emf) signal. In practical implementation the pure integration is replaced by a low pass filter to avoid the DC drift and saturation problems at the integrator output because of the initial condition error and the inevitable DC components in the back emf signal. However, the low pass filter introduces errors in the estimated stator flux which are significant at frequencies near or lower than the cutoff frequency. Also the DC components in the back emf signal are amplified at the low pass filter output by a factor equals to . Therefore, different integration algorithms have been proposed to improve the stator flux estimation at steady state and transient conditions. In this paper a new algorithm for stator flux estimation is proposed for direct torque control (DTC) of induction motor drives. The proposed algorithm is composed of a second order high pass filter and an integrator which can effectively eliminates the effect of the error initial condition and the DC components. The amplitude and phase errors compensation algorithm is selected such that the steady state frequency response amplitude and phase angle are equivalent to that of the pure integrator and the multiplication and division by stator frequency are avoided. Also the cutoff frequency selection is improved; even small value can filter out the DC components in the back emf signal. The simulation results show the improved performance of the induction motor direct torque control drive with the proposed stator flux estimation algorithm. The simulation results are verified by the experimental results.</p>

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