EPE Association: EPE 1997 â€“ 72: Dialogue Session DS8a-1: FACTS 1

EPE 1997 â€“ 72: Dialogue Session DS8a-1: FACTS 1
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 â€“ 72: Dialogue Session DS8a-1: FACTS 1

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   ITERATIVE HARMONIC SIMULATION BETWEEN A TCR, TRANSFORMER SATURATION AND THE POWER SYSTEM
By J. Arrillaga; J. Gonzalez; J. Cidras [View]
[Download]

Abstract: In this paper the IHA (Iterative Harmonic Analysis) algorithm is extended to analyse the harmonic interactions that occur between TCR (Thyristor Controlled Reactor) compensator, the transformer and the power under conditions of asymmetrical and asymmetrical transformer saturation.

   IMPLEMENTATION OF A ROBUST H-inf CONTROLLER FOR A UNIFIED POWER FLOW CONTROLLER SYSTEM
By Q. Yu; S. D. Round; L. E. Norum; T. M. Undeland [View]
[Download]

Abstract: This paper presents the design procedure of a robust H-inf controller for a unified power flow controller (UPFC). The experimental and simulation results show that the robust H-inf controller can achieve high level of performance such as a fast response and minimal interaction between the real and reactive power flows compared to traditional control systems.

   ANALOG REAL-TIME MODEL OF A UNIFIED POWER FLOW CONTROLLER
By M. M. de Oliveira; A. EkstrÃ¶m [View]
[Download]

Abstract: An scaled analog model of a Unified Power Flow Controller (UPFC) combined with conventional series capacitors for real-time simulation studies is presented. The combined simulated compensator is located in a transmission system with the purpose of controlling active and reactive power at the receiving bus. Digital Signal Processors (DSPs) are basically used for controlling the shunt and series converters. The control system has been designed based on the principle of minimum dependence upon network parameters that might be changed in real applications. The system performance is verified under transient conditions, both at symmetrical and non-symmetrical operation.

   APPLICATION OF FLEXIBLE AC TRANSMISSION SYSTEM DEVICES FOR THE MAXIMUM LOAD ABILITY IMPROVEMENT IN TRANSMISSION LINES
By S. M. Sadeghzadeh; M. Ehsan; N. Hadj Said; R. Feuillet [View]
[Download]

Abstract: The application of the super-conducting magnetic energy storage (SMES) and the thyristor controlled series capacitor (TCSC) is investigated to increase the maximum loadability of the transmission lines. In this way, an on-line fuzzy control scheme is suggested for each device. The fuzzy rule-bases are defined and explained. The validity of the suggested control strategies are confirmed by simulation tests of a simple power system. A generalization for a multi-machine case is carried out by applying the fuzzy controlled SMES to the New-England test system. The simulation results clearly show that by the use of the proposed method, the power transfer level can be increased via the improvement of the transient stability and damping requirements.

   STATIC ELECTRONIC TAP-CHANGER FOR FAST PHASE VOLTAGE CONTROL
By T. Larsson; R. Innanen; G. NorstrÃ¶m [View]
[Download]

Abstract: Industrial equipment such as speed drives, electronics, controls & robotics and computer & communication systems are affected by bad power quality. Voltage dips/sags can cause shutdown of whole plants or result in quality reductions. With an electronic Tap-Changer(DVR), most of the voltage dips can be avoided.

   ON USING FACTS AND POWER SYSTEM STABILIZERS TO DAMP LOW FREQUENCY OSCILLATIONS
By J.-C. Passelergue; N. HadjsaÃ¯d; Y. Besanger; R. Feuillet [View]
[Download]

Abstract: This paper presents a study of the application of a Flexible AC Transmission System device (STATic COMpensator) and a Power System Stabilizer to enhance the damping of an interarea oscillation exhibited by a two-area four-machine power system. The dynamic stability of the system is improved more by the STATCOM. The study of the system has also shown that an appropriate coordination has to be realized in order to avoid a worse low frequency oscillations damping.

   Forced Sharing of de Capacitor Voltages in a Multi-Level GTO Static Var Compensator (SVC)
By D. Scheidecker; S.B. Tennakoon [View]
[Download]

Abstract: The de capacitor voltage unbalance problem in multi-level Advanced Static Var Compensators (ASVCs) is explained. Various balancing schemes are discussed and a promising balancing scheme is proposed with theoretical and experimental results. A problem area in the leading mode is identified.

   INFLUENCE OF AC NETWORK IMPEDANCE ON THE CONTROL PERFORMANCE OF A VOLTAGE SOURCE CONVERTER OPERATING AT DIFFERENT SWITCHING FREQUENCIES
By A. Lindberg; M. M. de Oliveira; Y. Jiang [View]
[Download]

Abstract: This paper focuses on the operation of a Voltage Source Converter (VSC) working as a high power Static Var Compensator (SVC) connected to a high voltage AC system with different AC network impedance. The control performance for a VSC operating at fundamental switching frequency is compared with the performance for a VSC employing Pulse Width Modulation (PWM).

   MULTIVARIABLE FEEDBACK CURRENT CONTROL OF A PWM VOLTAGE SOURCE CONVERTER CONNECTED TO AN AC SYSTEM WITH VARIABLE AC NETWORK IMPEDANCE
By A. Lindberg; M. M. de Oliveira; Y. Jiang [View]
[Download]

Abstract: In this paper, a pulse width modulated Voltage Source Converter (VSC) connected to an AC system is investigated with respect to converter control performance for different types of multi variable current feedback controllers. Three types of controllers are evaluated, namely a decoupling current controller with a feedforward of the line AC voltage, a Linear Quadratic state space controller and an H_ current controller. The VSC is used as an reactive power source (i.e. as a Static Var Compensator (SVC)) and the current control responses with respect to different AC network impedance are of primary interest in the analysis.

   UPFC APPLICATION TO SUPPRESS FLICKER IN ARC FURNACE SUPPLY SYSTEM
By M. Zouiti; S.Saadate; X. Lombard; P. G. Therond; C. Poumarede [View]
[Download]

Abstract: SVC are nowadays quite widely employed in order to suppress flicker caused by arc furnaces. However, the flicker mitigation obtained by SVC is theoretically limited for two reasons:
â€¢ only reactive current can be compensated by means of SVC ;
â€¢ time response of SVC does not allow to suppress flicker with frequencies up to 10Hrz.
In order to remedy these drawbacks, a Unified Power Flow Controller (UPFC) which is capable to compensate quickly the voltage fluctuation with a good dynamic, is analyzed analytically and simulated.

EPE 1997 â€“ 72: Dialogue Session DS8a-1: FACTS 1
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 â€“ 72: Dialogue Session DS8a-1: FACTS 1
	[return to parent folder]

	ITERATIVE HARMONIC SIMULATION BETWEEN A TCR, TRANSFORMER SATURATION AND THE POWER SYSTEM By J. Arrillaga; J. Gonzalez; J. Cidras	[View] [Download]
Abstract: In this paper the IHA (Iterative Harmonic Analysis) algorithm is extended to analyse the harmonic interactions that occur between TCR (Thyristor Controlled Reactor) compensator, the transformer and the power under conditions of asymmetrical and asymmetrical transformer saturation.

	IMPLEMENTATION OF A ROBUST H-inf CONTROLLER FOR A UNIFIED POWER FLOW CONTROLLER SYSTEM By Q. Yu; S. D. Round; L. E. Norum; T. M. Undeland	[View] [Download]
Abstract: This paper presents the design procedure of a robust H-inf controller for a unified power flow controller (UPFC). The experimental and simulation results show that the robust H-inf controller can achieve high level of performance such as a fast response and minimal interaction between the real and reactive power flows compared to traditional control systems.

	ANALOG REAL-TIME MODEL OF A UNIFIED POWER FLOW CONTROLLER By M. M. de Oliveira; A. EkstrÃ¶m	[View] [Download]
Abstract: An scaled analog model of a Unified Power Flow Controller (UPFC) combined with conventional series capacitors for real-time simulation studies is presented. The combined simulated compensator is located in a transmission system with the purpose of controlling active and reactive power at the receiving bus. Digital Signal Processors (DSPs) are basically used for controlling the shunt and series converters. The control system has been designed based on the principle of minimum dependence upon network parameters that might be changed in real applications. The system performance is verified under transient conditions, both at symmetrical and non-symmetrical operation.

	APPLICATION OF FLEXIBLE AC TRANSMISSION SYSTEM DEVICES FOR THE MAXIMUM LOAD ABILITY IMPROVEMENT IN TRANSMISSION LINES By S. M. Sadeghzadeh; M. Ehsan; N. Hadj Said; R. Feuillet	[View] [Download]
Abstract: The application of the super-conducting magnetic energy storage (SMES) and the thyristor controlled series capacitor (TCSC) is investigated to increase the maximum loadability of the transmission lines. In this way, an on-line fuzzy control scheme is suggested for each device. The fuzzy rule-bases are defined and explained. The validity of the suggested control strategies are confirmed by simulation tests of a simple power system. A generalization for a multi-machine case is carried out by applying the fuzzy controlled SMES to the New-England test system. The simulation results clearly show that by the use of the proposed method, the power transfer level can be increased via the improvement of the transient stability and damping requirements.

	STATIC ELECTRONIC TAP-CHANGER FOR FAST PHASE VOLTAGE CONTROL By T. Larsson; R. Innanen; G. NorstrÃ¶m	[View] [Download]
Abstract: Industrial equipment such as speed drives, electronics, controls & robotics and computer & communication systems are affected by bad power quality. Voltage dips/sags can cause shutdown of whole plants or result in quality reductions. With an electronic Tap-Changer(DVR), most of the voltage dips can be avoided.

	ON USING FACTS AND POWER SYSTEM STABILIZERS TO DAMP LOW FREQUENCY OSCILLATIONS By J.-C. Passelergue; N. HadjsaÃ¯d; Y. Besanger; R. Feuillet	[View] [Download]
Abstract: This paper presents a study of the application of a Flexible AC Transmission System device (STATic COMpensator) and a Power System Stabilizer to enhance the damping of an interarea oscillation exhibited by a two-area four-machine power system. The dynamic stability of the system is improved more by the STATCOM. The study of the system has also shown that an appropriate coordination has to be realized in order to avoid a worse low frequency oscillations damping.

	Forced Sharing of de Capacitor Voltages in a Multi-Level GTO Static Var Compensator (SVC) By D. Scheidecker; S.B. Tennakoon	[View] [Download]
Abstract: The de capacitor voltage unbalance problem in multi-level Advanced Static Var Compensators (ASVCs) is explained. Various balancing schemes are discussed and a promising balancing scheme is proposed with theoretical and experimental results. A problem area in the leading mode is identified.

	INFLUENCE OF AC NETWORK IMPEDANCE ON THE CONTROL PERFORMANCE OF A VOLTAGE SOURCE CONVERTER OPERATING AT DIFFERENT SWITCHING FREQUENCIES By A. Lindberg; M. M. de Oliveira; Y. Jiang	[View] [Download]
Abstract: This paper focuses on the operation of a Voltage Source Converter (VSC) working as a high power Static Var Compensator (SVC) connected to a high voltage AC system with different AC network impedance. The control performance for a VSC operating at fundamental switching frequency is compared with the performance for a VSC employing Pulse Width Modulation (PWM).

	MULTIVARIABLE FEEDBACK CURRENT CONTROL OF A PWM VOLTAGE SOURCE CONVERTER CONNECTED TO AN AC SYSTEM WITH VARIABLE AC NETWORK IMPEDANCE By A. Lindberg; M. M. de Oliveira; Y. Jiang	[View] [Download]
Abstract: In this paper, a pulse width modulated Voltage Source Converter (VSC) connected to an AC system is investigated with respect to converter control performance for different types of multi variable current feedback controllers. Three types of controllers are evaluated, namely a decoupling current controller with a feedforward of the line AC voltage, a Linear Quadratic state space controller and an H_ current controller. The VSC is used as an reactive power source (i.e. as a Static Var Compensator (SVC)) and the current control responses with respect to different AC network impedance are of primary interest in the analysis.

	UPFC APPLICATION TO SUPPRESS FLICKER IN ARC FURNACE SUPPLY SYSTEM By M. Zouiti; S.Saadate; X. Lombard; P. G. Therond; C. Poumarede	[View] [Download]
Abstract: SVC are nowadays quite widely employed in order to suppress flicker caused by arc furnaces. However, the flicker mitigation obtained by SVC is theoretically limited for two reasons: â€¢ only reactive current can be compensated by means of SVC ; â€¢ time response of SVC does not allow to suppress flicker with frequencies up to 10Hrz. In order to remedy these drawbacks, a Unified Power Flow Controller (UPFC) which is capable to compensate quickly the voltage fluctuation with a good dynamic, is analyzed analytically and simulated.