Predictive diagnostics for the main field winding and rotating rectifier assembly in the brushless synchronous generator

Batzel, T.D.; Swanson, David C.; Defenbaugh, J.F.

doi:10.1109/demped.2003.1234600

Cited by 27 publications

(11 citation statements)

References 9 publications

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“…The proposed approach eliminates the brushes and/or rotating rectifier diodes that are often used in the wound-field synchronous generator [5]. Although both the proposed approach and the induction machine-based approach can be implemented using an inverter as the reactive power source, the proposed approach also has potential efficiency advantages due to elimination of rotor I 2 R conduction losses.…”

Section: Introductionmentioning

confidence: 97%

Design considerations for a stator side voltage regulated permanent magnet AC generator

Clements

Venkataramanan

Jahns

2009

2009 IEEE Energy Conversion Congress and Exposition

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The application of permanent magnet generators in variable-speed applications is made difficult by the lack of a direct field control and the variation of the stator voltage with shaft speed and also with load. This paper presents the use of reactive power injection into the stator as a means of regulating the stator voltage. Design-oriented analysis of the machine stator current and reactive power requirements for this mode of operation leads to the conclusion that high machine saliency enables excellent terminal voltage regulation over a specified speed and load range while minimizing stator current requirements. It is shown that the incorporation of saliency into the permanent magnet generator can significantly reduce the size of the reactive current source and the stator current that is required to regulate the stator voltage during operation over a broad range of speeds and loads. Experimental results are presented to confirm the basic principles of this approach.

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Section: Introductionmentioning

confidence: 97%

Design considerations for a stator side voltage regulated permanent magnet AC generator

Clements

Venkataramanan

Jahns

2009

2009 IEEE Energy Conversion Congress and Exposition

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“…They are capable of generating AC power at specified frequency, also called as synchronous generator and these machines are the largest energy converters in the world. Based on the excitation system, they can be grouped into brushed and brushless alternators [2]. The brushed alternator, also called as rotating armature type are used only in alternators of low power rating and generally is not used to supply electric power in large quantities.…”

Section: Introductionmentioning

confidence: 99%

Detection of Rotating Diode Failure Condition & its Protection in Brushless Alternator

Pranupa¹,

Kumar²,

Rao³

2018

IJET

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Brushless excitation system is widely used in large capacity synchronous generators since it removes the usage of commutator, brushes and slip rings, hence reduces the losses, maintenance and increases reliability. Rotating Rectifier Assembly (RRA) is the main part of brushless alternator. Due to ageing phenomenon and continuous process regime, diodes in rotating rectifier can fail either due to Open Circuit (OC) or Short Circuit (SC), which overloads the exciter and hence the alternator can no longer run securely. If such condition is prolonged, the Automatic Voltage Regulator (AVR) as well as the exciter windings can be damaged.This paper presents two different methods of diode failure detection in brushless alternators. First method uses an algorithm based on output voltage and the second uses the ripple factor of the exciter field current. Diode failure condition is detected for different type of loads connected to 4 kVA, 380 V, 50 Hz, 4 poles generator with 14 pole exciter (brushless alternator) and the results are verified using MATLAB/Simulink. Also, the protection schemes for rotating diode assembly as well as exciter field windings are presented using Metal Oxide Varistor (MOV) and Discharge Resistor.

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“…The main proposed indicators have dealt on ratio monitoring of the fundamental component regarding the dc level [1], as well as on the amplitude oversight of the component related to twice rated frequency [3]. In [4], others authors have suggested to measure the brushless transfer characteristic, given by the ratio of the generator"s output voltage and the exciter field current. On the other hand, many diagnosis techniques based on machine"s models [5], [6], [7], [8] and control algorithms [9], [10] have been suggested.…”

Section: Introductionmentioning

confidence: 99%

Brushless Three-Phase Synchronous Generator Under Rotating Diode Failure Conditions

Salah

Bacha

Châari

et al. 2014

IEEE Trans. Energy Convers.

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Predictive diagnostics for the main field winding and rotating rectifier assembly in the brushless synchronous generator

Cited by 27 publications

References 9 publications

Design considerations for a stator side voltage regulated permanent magnet AC generator

Design considerations for a stator side voltage regulated permanent magnet AC generator

Detection of Rotating Diode Failure Condition & its Protection in Brushless Alternator

Brushless Three-Phase Synchronous Generator Under Rotating Diode Failure Conditions

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