Dual control of synchronous generator for terminal voltage regulation-comparison with a single control

Bensmaine, Faycal; Barakat, Abdallah; Tnani, Slim; Champenois, Gérard; Mouni, Emile

doi:10.1016/j.epsr.2012.05.010

Cited by 8 publications

(2 citation statements)

References 17 publications

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“…The field current's dynamic response is improved by connecting a chopper at the diode bridge rectifier's output, as shown in Fig. 1.15 [13]. In this system, the input voltage to the main exciter is always maintained at the rated voltage.…”

Section: Embedding Fully Controlled Switches In Brushless Excitersmentioning

confidence: 99%

A Line Commutated - Thyristor Bridge Emulated Rotating Power Electronic Converter for Brushless Exciter Applications

Pallantla

Deivanayagam

Sreekanth

et al. 2020

2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL)

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Conventional brushless exciter supplies field current to the wound-field synchronous machines through a diode bridge rectifier. Though these diode bridge based exciters are more reliable than the static exciters, which use brushes and slip rings, they can not produce a negative voltage across the field winding, making the rate of decay of the field current slow. In case of an internal fault in the synchronous machine, the field current needs to be removed rapidly.In this dissertation, a novel thyristor emulated rotating power electronic converter (RPEC) is proposed for brushless exciter (BLE) applications. In this proposed threephase AC-DC converter, each phase comprises a diode in series with a MOSFET. This converter can produce both positive and negative voltage across the field winding. It also can operate at higher frequencies, and thus exciter will be more compact and energy-efficient. This topology also eliminates the need for a DC-link capacitor, which improves the brushless exciter system's reliability.Moreover, this converter needs only a single gate drive power supply as the MOS-FETs have their source terminals connected together. Furthermore, as the exciter is operated at higher frequencies, there will be a lower torque ripple at the synchronous machine output. Mode change is detected using a higher frequency component superimposed on the rotating transformer's fundamental voltage, due to which the exciter system is more robust and reliable.The first part of the thesis describes the proposed rotating power electronic converter operation and gate pulse generation during rectification and inversion modes.The second part of the thesis analyzes the field winding current disruption issue while switching from rectification to inversion mode. A new control algorithm is proposed to avoid the problem of mode change from rectification to inversion. The proposed topology, along with the proposed control algorithm, is simulated using Matlab/Simulink. A hardware prototype has been fabricated and tested. The simulation and experimental results verify the operation and advantages of the proposed topology and control.

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Section: Embedding Fully Controlled Switches In Brushless Excitersmentioning

confidence: 99%

A Line Commutated - Thyristor Bridge Emulated Rotating Power Electronic Converter for Brushless Exciter Applications

Pallantla

Deivanayagam

Sreekanth

et al. 2020

2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL)

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“…However, the de-excitation system proposed in these researches cannot be controlled in a closed loop control strategy to improve the dynamics of the voltage regulation. Authors in [16,17] proposed an excitation structure based on a rotating thyristor bridge. This solution allows controlling the generator field winding by negative and positive excitation voltages.…”

Section: Introductionmentioning

confidence: 99%

Controlled Brushless De-Excitation Structure for Synchronous Generators

Chouaba¹,

Barakat²

2019

Eng. Technol. Appl. Sci. Res.

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The main weakness of the brushless excitation system in a synchronous generator (SG) is the slow de-excitation response obtained during a load rejection. That is why voltage overshoots may be observed on the generator terminals. This behavior is mainly due to the exciter machine response time and the rotating diode bridge which is not able to quickly de-excite the generator by negative excitation voltages. This paper presents a new brushless de-excitation structure able to perform a quick de-excitation of the generator by providing controlled negative excitation voltage to the generator main field winding. The proposed structure is based on a new brushless de-excitation machine, called a control machine, and mounted on the same shaft of the generator and the brushless exciter. The brushless control machine is a low power one and used to transfer the orders from the voltage regulator to the discharge system located on the rotor side of the main generator. The dynamic performance of the proposed de-excitation system is evaluated in terms of system stability, voltage regulation response times and voltage overshoots during different load rejection tests. The proposed system is compared to the conventional brushless excitation system without the proposed de-excitation structure. In addition, a comparison is done with the static excitation system. The simulation tests are realized on an experimentally validated model of 11kVA synchronous generator developed in Matlab/Simulink.

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A micro-grid ensuring multi-objective control strategy of a power electrical system for quality improvement

Rekik

Abdelkafi

Krichen

2015

Energy

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Dual control of synchronous generator for terminal voltage regulation-comparison with a single control

Cited by 8 publications

References 17 publications

A Line Commutated - Thyristor Bridge Emulated Rotating Power Electronic Converter for Brushless Exciter Applications

A Line Commutated - Thyristor Bridge Emulated Rotating Power Electronic Converter for Brushless Exciter Applications

Controlled Brushless De-Excitation Structure for Synchronous Generators

A micro-grid ensuring multi-objective control strategy of a power electrical system for quality improvement

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