EPE Association: EPE 1997 – 16: Lecture Session L4d: FACTS

EPE 1997 – 16: Lecture Session L4d: FACTS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 16: Lecture Session L4d: FACTS

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   REACTIVE POWER COMPENSATION USING A UNIFIED POWER FLOW CONTROLLER FED BY A CURRENT SOURCE
By J. Jaeger; G. Herold [View]
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Abstract: A Unified Power Flow Controller, UPFC is able to control the throughput real and reactive powers independently. At present the worldwide interest is focused on the voltage source type UPFC. This paper introduces a new concept of a UPFC which is based on a current source and converter controlled phase-shifting transformer. For this reason the control scheme for the complex power flow becomes simpler and more independent of the network impedances. New operating methods of a decoupled reactive power compensation scheme and load flow control are deduced from the operating charts of the current source type UPFC. The results of the full UPFC operation, as described, are verified by measurements on a test model with a transient network analyser. The test results show the ability of the current source type UPFC to apply dynamic reactive power compensation and load flow control simultaneously in a real network configuration.

   OPTIMAL CONTROLLER FOR THE COMBINATION SYSTEM OF A UPFC AND CONVENTIONAL SERIES CAPACITORS
By Y. Jiang; A. Ekstrom [View]
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Abstract: The combination system of a Unified Power Flow Controller and conventional series capacitors has been studied. The related control problem is resolved hy employing the Hoo optimal control. Simulation with a two terminal transmission system using EMTP demonstrates the good performance of the designed Hoo controller. The robustness of the Hoo controller under variations of transmission line parameters has also been discussed.

   ANALYTICAL CALCULATION OF 6-PULSE CURRENT CONVERTERS IN LARGE COMPENSATED NETWORKS IN STEADY STATE
By C. Weindl; G. Herold [View]
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Abstract: The approach presented in this paper for the calculation of networks, including 6-pulse current converter bridges, utilises the periodicity of all state variables in steady-state operating mode. The entire system (3-phase networks compensation devices current converter - d.c. network) is represented in complex space phasor components for each switching status and described in state space considering the eigenvalues and switching sequence of the current converter. The resulting linear inhomogeneous boundary value problem is solved as a whole. Therefore the time functions of all state variables in large and compensated networks are obtained analytically. Further signal processing leads to the harmonic load, power flows, reactive compensation factor and stationary resonance conditions in transmission systems.

   THE IGCT - THE KEY TECHNOLOGY FOR LOW COST, HIGH RELIABLE HIGH POWER CONVERTERS WITH SERIES CONNECTED TURN-OFF DEVICES
By P. K. Steimer; H. Grüning; J. Werninger [View]
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Abstract: The IGCT technology (Integrated Gate-Commutated-Thyristor), which is based on the concept of the hard driven GTO, reduces inherently the storage time of the turn-off device to 1 us and allows the robust series connection of high power turn-off devices. The homogenous operation, especially during turn-off, allows the reduction or even elimination of the dv/dt snubber. Together with an improved device design (buffer layer, transparent anode) the inverter losses and costs are dramatically reduced. The first application of this technology in a 100 MVA intertie based on the 1st generation of series connected IGCTs is discussed and operational experience is presented.

   DESIGN OF A UNIFIED POWER FLOW CONTROLLER FOR IMPLEMENTATION INTO A MICRONETWORK
By G. Manon, Ph. Delarue; R. Bausiere; M. Crappe; M. Renglet; S. Dupuis [View]
[Download]

Abstract: This paper deals with the design of a Unified Power Flow Controller (UPFC) which has to be implemented into a micronetwork. The proposed structure takes into account the harmonic pollution aspect. The functionalities of UPFC are discussed and that leads to design the control architecture. In this paper the bridge control techniques are explained in details. Simulation results of the behaviour of one of the converters associated to its filter are then compared with experimental tests.

EPE 1997 – 16: Lecture Session L4d: FACTS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 16: Lecture Session L4d: FACTS
	[return to parent folder]

	REACTIVE POWER COMPENSATION USING A UNIFIED POWER FLOW CONTROLLER FED BY A CURRENT SOURCE By J. Jaeger; G. Herold	[View] [Download]
Abstract: A Unified Power Flow Controller, UPFC is able to control the throughput real and reactive powers independently. At present the worldwide interest is focused on the voltage source type UPFC. This paper introduces a new concept of a UPFC which is based on a current source and converter controlled phase-shifting transformer. For this reason the control scheme for the complex power flow becomes simpler and more independent of the network impedances. New operating methods of a decoupled reactive power compensation scheme and load flow control are deduced from the operating charts of the current source type UPFC. The results of the full UPFC operation, as described, are verified by measurements on a test model with a transient network analyser. The test results show the ability of the current source type UPFC to apply dynamic reactive power compensation and load flow control simultaneously in a real network configuration.

	OPTIMAL CONTROLLER FOR THE COMBINATION SYSTEM OF A UPFC AND CONVENTIONAL SERIES CAPACITORS By Y. Jiang; A. Ekstrom	[View] [Download]
Abstract: The combination system of a Unified Power Flow Controller and conventional series capacitors has been studied. The related control problem is resolved hy employing the Hoo optimal control. Simulation with a two terminal transmission system using EMTP demonstrates the good performance of the designed Hoo controller. The robustness of the Hoo controller under variations of transmission line parameters has also been discussed.

	ANALYTICAL CALCULATION OF 6-PULSE CURRENT CONVERTERS IN LARGE COMPENSATED NETWORKS IN STEADY STATE By C. Weindl; G. Herold	[View] [Download]
Abstract: The approach presented in this paper for the calculation of networks, including 6-pulse current converter bridges, utilises the periodicity of all state variables in steady-state operating mode. The entire system (3-phase networks compensation devices current converter - d.c. network) is represented in complex space phasor components for each switching status and described in state space considering the eigenvalues and switching sequence of the current converter. The resulting linear inhomogeneous boundary value problem is solved as a whole. Therefore the time functions of all state variables in large and compensated networks are obtained analytically. Further signal processing leads to the harmonic load, power flows, reactive compensation factor and stationary resonance conditions in transmission systems.

	THE IGCT - THE KEY TECHNOLOGY FOR LOW COST, HIGH RELIABLE HIGH POWER CONVERTERS WITH SERIES CONNECTED TURN-OFF DEVICES By P. K. Steimer; H. Grüning; J. Werninger	[View] [Download]
Abstract: The IGCT technology (Integrated Gate-Commutated-Thyristor), which is based on the concept of the hard driven GTO, reduces inherently the storage time of the turn-off device to 1 us and allows the robust series connection of high power turn-off devices. The homogenous operation, especially during turn-off, allows the reduction or even elimination of the dv/dt snubber. Together with an improved device design (buffer layer, transparent anode) the inverter losses and costs are dramatically reduced. The first application of this technology in a 100 MVA intertie based on the 1st generation of series connected IGCTs is discussed and operational experience is presented.

	DESIGN OF A UNIFIED POWER FLOW CONTROLLER FOR IMPLEMENTATION INTO A MICRONETWORK By G. Manon, Ph. Delarue; R. Bausiere; M. Crappe; M. Renglet; S. Dupuis	[View] [Download]
Abstract: This paper deals with the design of a Unified Power Flow Controller (UPFC) which has to be implemented into a micronetwork. The proposed structure takes into account the harmonic pollution aspect. The functionalities of UPFC are discussed and that leads to design the control architecture. In this paper the bridge control techniques are explained in details. Simulation results of the behaviour of one of the converters associated to its filter are then compared with experimental tests.