EPE Association: EPE 1997 – 43: Dialogue Session DS8i: GENERATOR, EX. SYSTEMS

EPE 1997 – 43: Dialogue Session DS8i: GENERATOR, EX. SYSTEMS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 43: Dialogue Session DS8i: GENERATOR, EX. SYSTEMS

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   A BOOST-BUCK CHOPPER TYPE STATIC EXCITATION SYSTEM FOR SYNCHRONOUS GENERATOR
By Hong-Woo Rhew; Chang-Ki Jeong [View]
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Abstract: A new boost-buck chopper type static excitation system for synchronous generator that can sustain proper output voltage level even at the fault condition is proposed. The proposed excitation system is capable of supplying the maximum field current as long as the input voltage level remains above 55% of the rated voltage in this specific design. The maximum field current is a current to be supplied by the conventional bus fed one at the rated input voltage level. The proper operation of the proposed excitation system is verified and tested using computer simulations as well as step function tests. The step function tests are performed with a 25KV A synchronous generator driven by a de motor. The simulation results indicate that a better stability, that can be achieved by a conventional bus fed one, can be realized with the proposed excitation system.

   SEMI-CONDUCTOR STRESS EVALUATION IN GENERATOR BRUSHLESS EXCITERS UNDER ABNORMAL OPERATING CONDITIONS
By T. Zouaghi; M. Poloujadoff; Y. Pencreach [View]
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Abstract: This paper describes a numerical method for modelling brushless d-e machines which are commonly utilized for large turbo-generator exciting systems. This study is especially focused on faulted diode operating simulation of the exciter and the evaluation of stresses occured to the safe components. It makes possible the prediction of exciter operation maintaining (or not) with failed diodes. Results show that in general, operation with shortcicuited diodes is unbearable for the machine. However, it can be maintained if few diodes are opened.

   Experience with Static Excitation Systems based on DC-Drives technology
By Jose Taborda; J.Frous [View]
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Abstract: The new generation of UNITROL F Static Excitation Systems and Voltage Regulators are based on the DCS500 DC-Drives product family. The main features, in particular the control circuits, are described. Practical experiences with UNITROL F to replace previously supplied voltage regulators as well as for new built generators are mentioned.

   SIMULATION OF THE GENERATOR AND THE POWER SUPPLY SYSTEM FOR THE TJ-II SPANISH STELLARATOR
By J. Acero; LJ. Iglesias; J.M. del Rio; C. Lucia; L. Garcia-Tabares [View]
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Abstract: This paper presents a simulation with SABER™ of the complete power supply system for the TJ-11 Spanish Fusion Reactor. The TJ-II consists of seven magnetically coupled coils each of them supplied by a twelve pulse thyristor rectifier. The energy required by the coils is supplied by a flywheel synchronous generator working in pulsed mode. All important parts of the system are implemented in the simulation to verify the initial design and to optimise the control circuit parameters. The main aspects that have been analysed by means of simulation are as follows: current ripple specifications, control system design, influence of coupling between coils, synchronous generator transient behaviour etc. Power Supplies have already been constructed and tested at the factory, and now the complete TJ-II system is under installation at CIEMAT (Energetic, Technologic and Environment Research Centre of Madrid, Spain). Experimental results are expected to be available at the end of the 1997.

   DEVELOPMENT OF STATIC EXCITATION SYSTEM USING ADAPTVE CONTROL METHOD
By C. K. Kim; I. H. Lim; H. W. Rhew; Y. H. Kirn [View]
[Download]

Abstract: A new improved. excitation control system for power plant synchronous generators has been developed by KEPRI (Korea Electric Power Research Institute). The reliability of the excitation system is increased by designing a dual channel automatic voltage regulator (AVR). Also the performance of the excitation system is improved by FSAC (Fuzzy Sliding Adaptive Controller) and by PWM (Pulse Width Modulation) in follow-up & current sharing circuits. A software package is developed for the excitation control system, and a field test is conducted to verify the system performance.

EPE 1997 – 43: Dialogue Session DS8i: GENERATOR, EX. SYSTEMS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 43: Dialogue Session DS8i: GENERATOR, EX. SYSTEMS
	[return to parent folder]

	A BOOST-BUCK CHOPPER TYPE STATIC EXCITATION SYSTEM FOR SYNCHRONOUS GENERATOR By Hong-Woo Rhew; Chang-Ki Jeong	[View] [Download]
Abstract: A new boost-buck chopper type static excitation system for synchronous generator that can sustain proper output voltage level even at the fault condition is proposed. The proposed excitation system is capable of supplying the maximum field current as long as the input voltage level remains above 55% of the rated voltage in this specific design. The maximum field current is a current to be supplied by the conventional bus fed one at the rated input voltage level. The proper operation of the proposed excitation system is verified and tested using computer simulations as well as step function tests. The step function tests are performed with a 25KV A synchronous generator driven by a de motor. The simulation results indicate that a better stability, that can be achieved by a conventional bus fed one, can be realized with the proposed excitation system.

	SEMI-CONDUCTOR STRESS EVALUATION IN GENERATOR BRUSHLESS EXCITERS UNDER ABNORMAL OPERATING CONDITIONS By T. Zouaghi; M. Poloujadoff; Y. Pencreach	[View] [Download]
Abstract: This paper describes a numerical method for modelling brushless d-e machines which are commonly utilized for large turbo-generator exciting systems. This study is especially focused on faulted diode operating simulation of the exciter and the evaluation of stresses occured to the safe components. It makes possible the prediction of exciter operation maintaining (or not) with failed diodes. Results show that in general, operation with shortcicuited diodes is unbearable for the machine. However, it can be maintained if few diodes are opened.

	Experience with Static Excitation Systems based on DC-Drives technology By Jose Taborda; J.Frous	[View] [Download]
Abstract: The new generation of UNITROL F Static Excitation Systems and Voltage Regulators are based on the DCS500 DC-Drives product family. The main features, in particular the control circuits, are described. Practical experiences with UNITROL F to replace previously supplied voltage regulators as well as for new built generators are mentioned.

	SIMULATION OF THE GENERATOR AND THE POWER SUPPLY SYSTEM FOR THE TJ-II SPANISH STELLARATOR By J. Acero; LJ. Iglesias; J.M. del Rio; C. Lucia; L. Garcia-Tabares	[View] [Download]
Abstract: This paper presents a simulation with SABER™ of the complete power supply system for the TJ-11 Spanish Fusion Reactor. The TJ-II consists of seven magnetically coupled coils each of them supplied by a twelve pulse thyristor rectifier. The energy required by the coils is supplied by a flywheel synchronous generator working in pulsed mode. All important parts of the system are implemented in the simulation to verify the initial design and to optimise the control circuit parameters. The main aspects that have been analysed by means of simulation are as follows: current ripple specifications, control system design, influence of coupling between coils, synchronous generator transient behaviour etc. Power Supplies have already been constructed and tested at the factory, and now the complete TJ-II system is under installation at CIEMAT (Energetic, Technologic and Environment Research Centre of Madrid, Spain). Experimental results are expected to be available at the end of the 1997.

	DEVELOPMENT OF STATIC EXCITATION SYSTEM USING ADAPTVE CONTROL METHOD By C. K. Kim; I. H. Lim; H. W. Rhew; Y. H. Kirn	[View] [Download]
Abstract: A new improved. excitation control system for power plant synchronous generators has been developed by KEPRI (Korea Electric Power Research Institute). The reliability of the excitation system is increased by designing a dual channel automatic voltage regulator (AVR). Also the performance of the excitation system is improved by FSAC (Fuzzy Sliding Adaptive Controller) and by PWM (Pulse Width Modulation) in follow-up & current sharing circuits. A software package is developed for the excitation control system, and a field test is conducted to verify the system performance.