EPE Association: EPE 2003 - Topic 12b: HVDC

EPE 2003 - Topic 12b: HVDC
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2003 - Conference > EPE 2003 - Topic 12: POWER ELECTRONICS IN GENERATION, TRANSMISSION AND DISTRIBUTION OF ELECTRICAL ENERGY > EPE 2003 - Topic 12b: HVDC

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   Cooperation between line-commutated current-source converters and forced-commutated voltage-source converters in HVDC transmission
By P. Fischer de Toledo; A. Ekström [View]
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Abstract: The study treats dynamic simulations of HVDC transmission system consisting of mixed line-commutated current-source converters and forced-commutated voltage-source converters. Three basic hybrid topologies were modelled in the digital simulator EMTDC/PSCAD software. The first topology has different types of converters in the two terminals, the second topology current-source and voltage-source converters connected in series on the dc-side in the same station and the third topology current-source converters in one pole and voltage-source converters in the other pole. The performance as well as special control requirements and strategies are treated.

   Analysis and synthesis of a digital high dynamics robust PLL for VSC-HVDC robust control
By E. Courbon; S. Poullain;J-L. Thomas [View]
[Download]

Abstract: paper deals with the analysis and the synthesis of a robust high dynamics PLL for VSC-HVDC control. The aim of this robust PLL is to track the position angle of the positive voltage sequence U1,+ instead of the AC line voltage one. This analysis is done on the basis of the decomposition of any three phases system in positive (direct), negative (inverse) and zero symmetrical sequences. A discrete-time synthesis is proposed.

   Robust DC bus voltage control based on Backstepping and Lyapunov methods for long distance VSC transmission scheme
By S. Brégeon; A. Benchaib; S. Poullain; J.L. Thomas [View]
[Download]

Abstract: This paper deals with a new robust control scheme for long distance Voltage Source Converter (VSC) HVDC systems. The proposed controller based on full analytical state-space model of long DC cable, uses Backstepping technique and Lyapunov theory. The simulation results will show the eﬀectiveness of the proposed controller.

   State estimation of DC cable for long distance VSC transmission scheme control using Kalman filter and adaptive control
By S. Brégeon; A. Benchaib; S. Poullain; J-L. Thomas [View]
[Download]

Abstract: In long distance VSC-HVDC application and in order to achieve a good network control and stability, the observer use is unavoidable when there is no communicated information between stations. In control algorithm, performances are greatly influenced by the accuracy of the unmeasured variables estimation. This paper deals with new observer scheme for DC power transmission system in order to estimate DC cable states and external load disturbance. To do so, an observer based on cable state-space model is designed using Kalman theory and adaptive control technique.

   VSC-HVDC robust control scheme in unbalanced network conditions
By S. Poullain; E. Courbon; J.L.Thomas [View]
[Download]

Abstract: This paper deals with the synthesis of a VSC-HVDC robust control scheme in unbalanced network conditions. The synthesis of the associated controllers combines nonlinear state-space modeling of VSC-HVDC system and unbalanced three phases system decomposition in positive/negative sequences. Simulation results of a 300 MW HVDC scheme using such controllers are presented.

   Sliding modes control of VSC-HVDC transmission systems
By H. Cherouat; H. Siguerdidjane; J-L. Thomas; S. Poullain [View]
[Download]

Abstract: The purpose of this paper is to emphasize the dynamic performance of VSC-HVDC systems, based on equivalent continuous-time state-space models for rectifier and inverter actuators, by using sliding modes control strategy. This present study is dealing with systems of high power ratings up to 300 MW. It is shown that the required specifications are met and the designed controller stabilizes short and long length DC cables as well. Simulation results are given.

   A study on solution against core saturation instability at an HVDC converter
By B.-M. Yang; C.-K. Kim; Y.-H. Moon [View]
[Download]

Abstract: The paper identifies a severe form of core saturation instability in an DC/AC interaction system. It then seeks solutions to the problem by HVDC control means. This is achieved by a proper design of the Voltage Dependant Current Order Limiter (VDCOL), the Current Regulator and Timing Pulse generator. Supplementary control loops have also been introduced to result in a satisfactory performance as compared to that obtained one with the use of uncharacteristic harmonic filte on the AC side. And another new method, which adopted as the modified PI gain is presented. By using t, a more useful interaction can be achieved and it manifests itself in stable AC and DC system operation, which is confirmed by results of simulations in PSCAD/EMTDC program. All the options has been demonstrated through recovery performance of the DC link in response to both 1-phase and 3-phase 5 cycle faults on both rectifier and inverter commutating buses.

EPE 2003 - Topic 12b: HVDC
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2003 - Conference > EPE 2003 - Topic 12: POWER ELECTRONICS IN GENERATION, TRANSMISSION AND DISTRIBUTION OF ELECTRICAL ENERGY > EPE 2003 - Topic 12b: HVDC
	[return to parent folder]

	Cooperation between line-commutated current-source converters and forced-commutated voltage-source converters in HVDC transmission By P. Fischer de Toledo; A. Ekström	[View] [Download]
Abstract: The study treats dynamic simulations of HVDC transmission system consisting of mixed line-commutated current-source converters and forced-commutated voltage-source converters. Three basic hybrid topologies were modelled in the digital simulator EMTDC/PSCAD software. The first topology has different types of converters in the two terminals, the second topology current-source and voltage-source converters connected in series on the dc-side in the same station and the third topology current-source converters in one pole and voltage-source converters in the other pole. The performance as well as special control requirements and strategies are treated.

	Analysis and synthesis of a digital high dynamics robust PLL for VSC-HVDC robust control By E. Courbon; S. Poullain;J-L. Thomas	[View] [Download]
Abstract: paper deals with the analysis and the synthesis of a robust high dynamics PLL for VSC-HVDC control. The aim of this robust PLL is to track the position angle of the positive voltage sequence U1,+ instead of the AC line voltage one. This analysis is done on the basis of the decomposition of any three phases system in positive (direct), negative (inverse) and zero symmetrical sequences. A discrete-time synthesis is proposed.

	Robust DC bus voltage control based on Backstepping and Lyapunov methods for long distance VSC transmission scheme By S. Brégeon; A. Benchaib; S. Poullain; J.L. Thomas	[View] [Download]
Abstract: This paper deals with a new robust control scheme for long distance Voltage Source Converter (VSC) HVDC systems. The proposed controller based on full analytical state-space model of long DC cable, uses Backstepping technique and Lyapunov theory. The simulation results will show the eﬀectiveness of the proposed controller.

	State estimation of DC cable for long distance VSC transmission scheme control using Kalman filter and adaptive control By S. Brégeon; A. Benchaib; S. Poullain; J-L. Thomas	[View] [Download]
Abstract: In long distance VSC-HVDC application and in order to achieve a good network control and stability, the observer use is unavoidable when there is no communicated information between stations. In control algorithm, performances are greatly influenced by the accuracy of the unmeasured variables estimation. This paper deals with new observer scheme for DC power transmission system in order to estimate DC cable states and external load disturbance. To do so, an observer based on cable state-space model is designed using Kalman theory and adaptive control technique.

	VSC-HVDC robust control scheme in unbalanced network conditions By S. Poullain; E. Courbon; J.L.Thomas	[View] [Download]
Abstract: This paper deals with the synthesis of a VSC-HVDC robust control scheme in unbalanced network conditions. The synthesis of the associated controllers combines nonlinear state-space modeling of VSC-HVDC system and unbalanced three phases system decomposition in positive/negative sequences. Simulation results of a 300 MW HVDC scheme using such controllers are presented.

	Sliding modes control of VSC-HVDC transmission systems By H. Cherouat; H. Siguerdidjane; J-L. Thomas; S. Poullain	[View] [Download]
Abstract: The purpose of this paper is to emphasize the dynamic performance of VSC-HVDC systems, based on equivalent continuous-time state-space models for rectifier and inverter actuators, by using sliding modes control strategy. This present study is dealing with systems of high power ratings up to 300 MW. It is shown that the required specifications are met and the designed controller stabilizes short and long length DC cables as well. Simulation results are given.

	A study on solution against core saturation instability at an HVDC converter By B.-M. Yang; C.-K. Kim; Y.-H. Moon	[View] [Download]
Abstract: The paper identifies a severe form of core saturation instability in an DC/AC interaction system. It then seeks solutions to the problem by HVDC control means. This is achieved by a proper design of the Voltage Dependant Current Order Limiter (VDCOL), the Current Regulator and Timing Pulse generator. Supplementary control loops have also been introduced to result in a satisfactory performance as compared to that obtained one with the use of uncharacteristic harmonic filte on the AC side. And another new method, which adopted as the modified PI gain is presented. By using t, a more useful interaction can be achieved and it manifests itself in stable AC and DC system operation, which is confirmed by results of simulations in PSCAD/EMTDC program. All the options has been demonstrated through recovery performance of the DC link in response to both 1-phase and 3-phase 5 cycle faults on both rectifier and inverter commutating buses.