EPE Association: WECS & T&D 2011 - 08 - DS - Grid Connection and Compliance of Wind Power

WECS & T&D 2011 - 08 - DS - Grid Connection and Compliance of Wind Power
You are here: EPE Documents > 03 - EPE Seminar Papers > 005 - EPE Joint Wind Energy and T&D Chapters Seminar (2011) > WECS & T&D 2011 - 08 - DS - Grid Connection and Compliance of Wind Power

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   Effects of flexible AC transmission system (facts) on the performance of distance protection relays
By S. Subramanian; A. Perks; S.B. Tennakoon [View]
[Download]

Abstract: This poster, presented by S. Subramanian, A. Perks and S.B. Tennakoon, is about effects of flexible AC transmission system (facts) on the performance of distance protection relays

   Stability of Three-phase Grid-Connected Inverters
By Yan qiu; Lan Xiao; Ningrong Zhang; Zhilei Yao [View]
[Download]

Abstract: The aim of this paper is to analyze the stability problems of grid connected inverters. The influence of different control structure, grid impedance and current sampling frequency on system stability is studied and the sensitivity of filter parameters is talked by the use of z-plane root locus design.

   Wind Power Collection and Transmission with Series Connected Current Source Converters
By Hak-Jun Lee; Seung-Ki Sul [View]
[Download]

Abstract: In this paper, series connected DC current source converter based Wind Turbine Generation System (WTGS) is proposed. Not only a multi-phase generator but also a group of wind turbine generator can be linked easily with multiple series connected current source converters. It is expected that the system can have higher availability and lower initial setup cost compared to conventional voltage source converter based WTGS. The modeling and the control strategy for the proposed system is investigated. A 3 MW system with three series connected current source converters has been simulated by the computer program. The effectiveness of the proposed control strategy is verified by the simulation.

   Direct Power Control Strategies of a Grid- Connected Three-Level Voltage Source Converter VSI-NPC
By R. Zaimeddine; Tore Undeland [View]
[Download]

Abstract: In this paper, a new switching table for direct power control (DPC) strategy is proposed for three-level NPC rectifier. The strategy is developed by analyzing active and reactive power and introducing convenient controllers to optimize the voltage selection which is the fundamental task in that control method. The dc-link voltages are maintained at the required level using hysteresis controller for the NP current exploiting the redundancy states of the rectifier. With a simple switching table, the excellent dynamic and transient performances are achieved under unity power factor operation. Simulation results verify the validity and feasibility of the proposed strategies.

   Direct Power Control Strategies of a Grid-Connected Three-Level Voltage Source Converter VSI-NPC (Presentation)
By R. Zaimeddine; Tore Undeland [View]
[Download]

Abstract: This presentation, given by R. Zaimeddine and Tore Undeland, is about Direct Power Control Strategies of a Grid-Connected Three-Level Voltage Source Converter VSI-NPC

   Reliability evaluation of power system with large-scale wind farm integration using First-Order Reliability Method
By M. T. Do; J. Sprooten; S. Clenet; B. Robyns [View]
[Download]

Abstract: With the fast development of wind power, the reliability of power systems becomes more difficult to be evaluated. Grid operators are lacking tools for day-ahead decision making in presence of a high penetration of uncertain generation. Short-term power system reliability evaluation using Monte Carlo Simulation (MCS) is not feasible due to its high computation cost. This study proposes to use the First-Order Reliability Method (FORM), coupled with the law of total probability, for short-term reliability assessment of power systems with large amount of wind power. This method is much faster than the MCS and allows us to evaluate the probability of load shedding due to many causes: lack of production, voltage constraints, line congestion, etc. A reliability assessment is implemented on a medium-voltage regional network using day-ahead forecasts. Using the proposed method, the reliability assessment of the power system is done with the same accuracy and with a computing time greatly reduced. Test results of the proposed method are compared with those obtained from the MCS.

   Stability Analysis of an Offshore Grid supplied by a HVDC-VSC
By Matias Ebbe Theisen; Ã˜yvind Rui; Terje Gjengedal [View]
[Download]

Abstract: The establishment of offshore AC grids gives the opportunity to connect wind farms and oil platforms within the limited distance of AC cables. Several of these AC grids can be interconnected and connected to shore by a multi-terminal DC grid. In order to supply oil platforms it is important that the offshore AC grid can assure reliable power with acceptable quality. This is analyzed by establishing a conceptual AC grid in the simulation program Simpow. The simulations show that the grid does sustain good power quality as long as the connection to the multi-terminal DC grid is in operation.

WECS & T&D 2011 - 08 - DS - Grid Connection and Compliance of Wind Power
You are here: EPE Documents > 03 - EPE Seminar Papers > 005 - EPE Joint Wind Energy and T&D Chapters Seminar (2011) > WECS & T&D 2011 - 08 - DS - Grid Connection and Compliance of Wind Power
	[return to parent folder]

	Effects of flexible AC transmission system (facts) on the performance of distance protection relays By S. Subramanian; A. Perks; S.B. Tennakoon	[View] [Download]
Abstract: This poster, presented by S. Subramanian, A. Perks and S.B. Tennakoon, is about effects of flexible AC transmission system (facts) on the performance of distance protection relays

	Stability of Three-phase Grid-Connected Inverters By Yan qiu; Lan Xiao; Ningrong Zhang; Zhilei Yao	[View] [Download]
Abstract: The aim of this paper is to analyze the stability problems of grid connected inverters. The influence of different control structure, grid impedance and current sampling frequency on system stability is studied and the sensitivity of filter parameters is talked by the use of z-plane root locus design.

	Wind Power Collection and Transmission with Series Connected Current Source Converters By Hak-Jun Lee; Seung-Ki Sul	[View] [Download]
Abstract: In this paper, series connected DC current source converter based Wind Turbine Generation System (WTGS) is proposed. Not only a multi-phase generator but also a group of wind turbine generator can be linked easily with multiple series connected current source converters. It is expected that the system can have higher availability and lower initial setup cost compared to conventional voltage source converter based WTGS. The modeling and the control strategy for the proposed system is investigated. A 3 MW system with three series connected current source converters has been simulated by the computer program. The effectiveness of the proposed control strategy is verified by the simulation.

	Direct Power Control Strategies of a Grid- Connected Three-Level Voltage Source Converter VSI-NPC By R. Zaimeddine; Tore Undeland	[View] [Download]
Abstract: In this paper, a new switching table for direct power control (DPC) strategy is proposed for three-level NPC rectifier. The strategy is developed by analyzing active and reactive power and introducing convenient controllers to optimize the voltage selection which is the fundamental task in that control method. The dc-link voltages are maintained at the required level using hysteresis controller for the NP current exploiting the redundancy states of the rectifier. With a simple switching table, the excellent dynamic and transient performances are achieved under unity power factor operation. Simulation results verify the validity and feasibility of the proposed strategies.

	Direct Power Control Strategies of a Grid-Connected Three-Level Voltage Source Converter VSI-NPC (Presentation) By R. Zaimeddine; Tore Undeland	[View] [Download]
Abstract: This presentation, given by R. Zaimeddine and Tore Undeland, is about Direct Power Control Strategies of a Grid-Connected Three-Level Voltage Source Converter VSI-NPC

	Reliability evaluation of power system with large-scale wind farm integration using First-Order Reliability Method By M. T. Do; J. Sprooten; S. Clenet; B. Robyns	[View] [Download]
Abstract: With the fast development of wind power, the reliability of power systems becomes more difficult to be evaluated. Grid operators are lacking tools for day-ahead decision making in presence of a high penetration of uncertain generation. Short-term power system reliability evaluation using Monte Carlo Simulation (MCS) is not feasible due to its high computation cost. This study proposes to use the First-Order Reliability Method (FORM), coupled with the law of total probability, for short-term reliability assessment of power systems with large amount of wind power. This method is much faster than the MCS and allows us to evaluate the probability of load shedding due to many causes: lack of production, voltage constraints, line congestion, etc. A reliability assessment is implemented on a medium-voltage regional network using day-ahead forecasts. Using the proposed method, the reliability assessment of the power system is done with the same accuracy and with a computing time greatly reduced. Test results of the proposed method are compared with those obtained from the MCS.

	Stability Analysis of an Offshore Grid supplied by a HVDC-VSC By Matias Ebbe Theisen; Ã˜yvind Rui; Terje Gjengedal	[View] [Download]
Abstract: The establishment of offshore AC grids gives the opportunity to connect wind farms and oil platforms within the limited distance of AC cables. Several of these AC grids can be interconnected and connected to shore by a multi-terminal DC grid. In order to supply oil platforms it is important that the offshore AC grid can assure reliable power with acceptable quality. This is analyzed by establishing a conceptual AC grid in the simulation program Simpow. The simulations show that the grid does sustain good power quality as long as the connection to the multi-terminal DC grid is in operation.