Equivalent circuit for the brushless doubly fed machine (BDFM) including parameter estimation and experimental verification

Roberts, Paul C.; McMahon, R.A.; Tavner, Peter; Maciejowski, Jan M.; Flack, T.J.

doi:10.1049/ip-epa:20045106

Cited by 160 publications

(152 citation statements)

References 23 publications

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“…7 represent the rotor angles (u r ) obtained from (19), and their absolute variations from encoder measurements. Note that a shaft position sensor was used simply for monitoring purposes and not for control.…”

Section: Resultsmentioning

confidence: 99%

“…5. The observer last prediction, u, has served as a reference while selecting the best out of the ten raw estimates available per 500 ms speed control interval (as there are two possible solutions for u r according to (19) calculated each 100 ms) that is the one having the least absolute deviation from u. Therefore the estimator block itself carries out the first filtering of noisy u r before inputting the best estimate to the observer for further processing.…”

Section: Resultsmentioning

confidence: 99%

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Sensored and sensorless speed control methods for brushless doubly fed reluctance motors

Jovanović

2009

IET Electr. Power Appl.

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Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) Abstract: The study considers aspects of scalar V/f control, vector control and direct torque (and flux) control (DTC) of the brushless doubly fed reluctance machine (BDFRM) as a promising cost-effective alternative to the existing technological solutions for applications with restricted variable speed capability such as large pumps and wind turbine generators. Apart from providing a comprehensive literature review and analysis of these control methods, the development and results of experimental verification, of an angular velocity observerbased DTC scheme for sensorless speed control of the BDFRM which, unlike most of the other DTC-concept applications, can perform well down to zero supply frequency of the inverter-fed winding, have also been presented in the study.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Sensored and sensorless speed control methods for brushless doubly fed reluctance motors

Jovanović

2009

IET Electr. Power Appl.

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“…The equivalent circuit, whose parameters can be measured experimentally, is shown in Figure 2 [22]. In this figure, s 1 and s 2 are the rotor slips with respect to PW and CW, respectively, defined by:…”

Section: Equivalent Circuit Modelmentioning

confidence: 99%

Optimal reactive power flow in BDFMs for converter cost reduction and efficiency improvement

Jandaghi¹,

Gorginpour²,

Hashemnia³

et al. 2017

Turk J Elec Eng & Comp Sci

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Abstract:A brushless doubly fed machine is equipped with two decoupled windings on its stator, known as the power winding and the control winding. The power winding reactive power can be controlled by voltage amplitude fed by the machine-side converter to the control winding, affecting both the converter size and machine efficiency. This paper investigates different proposed scenarios for optimal reactive power flow targeted to minimize the converter cost and maximize the machine efficiency. Previously, the grid-side converter has not been used for reactive power compensation.However, in the present paper it is shown how the grid-side converter can be effectively used to reduce the converter cost by controlling the flow of reactive power. The optimal power winding reactive powers for minimizing the converter cost and for maximizing the output power are not the same. Then the priority of minimizing converter cost over maximizing machine output power has been justified.

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“…Instead of a brushed connection to the rotor, the BDFM achieves doubly-fed operation by employing two independent stator windings which are wound with different pole numbers to prevent their direct coupling [2]. The rotor is wound in such a way that it couples both pole number fields.…”

Section: A Bdfm Operationmentioning

confidence: 99%

“…The chart must be calculated from equivalent circuit parameters. These were extracted from cascade mode tests as detailed in [2] and are presented in table III. As explained in [2] parameters cannot be uniquely extracted for the circuit of fig.…”

Section: B Performancementioning

confidence: 99%

Practical deployment of the Brushless Doubly-Fed Machine in a medium scale wind turbine

Logan

Warrington

Shao

et al. 2009

2009 International Conference on Power Electronics and Drive Systems (PEDS)

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--The Brushless Doubly-Fed Machine (BDFM) is a brushless electrical generator which allows variable speed operation with a power converter rated at only a fraction of the machine rating. This paper details an example implementation of the BDFM in a medium-scale wind turbine. Details of a simplified design procedure based on electrical and magnetic loadings are given along with the results of tests on the manufactured machine. These show that a BDFM of the scale works as expected but that the 4/8 BDFM chosen was slower and thus larger than the turbine's original induction machine. The implementation of the turbine system is discussed, including the vector-based control scheme that ensures the BDFM operates at a demanded speed and the Maximum Power Point Tracking (MPPT) scheme that selects the rotor speed that extracts the most power from the incident wind conditions.

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Equivalent circuit for the brushless doubly fed machine (BDFM) including parameter estimation and experimental verification

Cited by 160 publications

References 23 publications

Sensored and sensorless speed control methods for brushless doubly fed reluctance motors

Sensored and sensorless speed control methods for brushless doubly fed reluctance motors

Optimal reactive power flow in BDFMs for converter cost reduction and efficiency improvement

Practical deployment of the Brushless Doubly-Fed Machine in a medium scale wind turbine

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