EPE Association: NORpie 2008 - Topic 06: WIND POWER AND PHOTOVOLTAICS

NORpie 2008 - Topic 06: WIND POWER AND PHOTOVOLTAICS
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 2008 > NORpie 2008 - Topic 06: WIND POWER AND PHOTOVOLTAICS

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   Multi-Terminal VSC-HVDC System for Integration of Offshore Wind Farms and Green Electrification of Platforms in the North Sea
By Temesgen M. Haileselassie, Marta Molinas, Tore Undeland [View]
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Abstract: This paper discusses a multi-terminal VSC-HVDC system proposed for integration of deep sea wind farms and offshore oil and gas platforms in to the Norwegian national grid onshore. An equivalent circuit of the VSC in synchronous d-q reference frame has been established and decoupled control of active and reactive power was developed. A three terminal VSC-HVDC was modeled and simulated in EMTDC/PSCAD software. Voltage margin method has been used for reliable operation of the HVDC system without the need of communication. Simulation results show that the proposed multi-terminal VSC-HVDC was able to maintain constant DC voltage operation during load switchings, step changes in power demand and was able to secure power to passive loads during loss of a DC voltage regulating VSC-HVDC terminal with out the use of communication between terminals.

   Wind Turbine and Grid Interaction Studies Using Integrated Real-Time Simulation Environment
By A. MÃ¤kinen, H. Tuusa [View]
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Abstract: Knowledge of interactions between wind turbines and network becomes essential as the number of wind turbines installed in the network increases. Thus, a simulation environment with accurate network and wind turbine models is needed. In this paper, a novel real-time simulation environment for wind turbine and grid interaction studies is presented. The network is simulated with Real-Time Digital Simulator (RTDS) and the wind turbine with its power electronic equipments in dSPACE. First, the wind turbine model is introduced. Next, realtime simulation results during three-phase short-circuit and automatic reclosing are presented and compared to Simulink results in order to verify the real-time model. Discussions about the reliability and usefulness of the environment are also performed.

   Selecting the Accurate Solar Panel Simulation Model
By Krisztina Leban, Ewen Ritchie [View]
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Abstract: This paper considers selection of the suitable simulation model for solar panels [1]. Two models for silicon polycrystalline photovoltaic solar cells [2], [3] were analysed. The selection is made by comparing the Power vs. Voltage and Current vs. Voltage curves obtained from the simulation to those obtained experimentally. The goal is to identify if a simulation model gives correct information about the behaviour of one single solar panel for varying temperature and irradiance. Final validation is done by comparing experimental and simulation results. The single panel model was integrated into array of 16 elements. This can be integrated in the simulation of an isolated micro grid or in a hybrid energy system [4], [5] By comparing simulation results from both models with experimental results we can conclude that model 2 is the most reliable one.

   Grid connected Converters for Photovoltaic, State of the Art, Ideas for Improvement of Transformerless Inverters
By Fritz Schimpf, Lars E. Norum [View]
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Abstract: The paper presents a short overview of the state of the art for grid tied PV inverters at low and medium power level (1..100 kW), mainly intended for rooftop applications. The inverters are categorized according to the configuration of the PV system, the configuration of the conversion stages within the inverter and whether they use transformers or not [1], [3]. After the introduction of the state of the art of inverters for PV systems with and without transformers, the paper focuses on some known problems and challenges for transformerless inverters. Topologies without transformers have big advantages like low weight, volume and cost. In addition they often reach higher efficiencies than topologies with transformers. Therefore they are important for future developments.

NORpie 2008 - Topic 06: WIND POWER AND PHOTOVOLTAICS
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 2008 > NORpie 2008 - Topic 06: WIND POWER AND PHOTOVOLTAICS
	[return to parent folder]

	Multi-Terminal VSC-HVDC System for Integration of Offshore Wind Farms and Green Electrification of Platforms in the North Sea By Temesgen M. Haileselassie, Marta Molinas, Tore Undeland	[View] [Download]
Abstract: This paper discusses a multi-terminal VSC-HVDC system proposed for integration of deep sea wind farms and offshore oil and gas platforms in to the Norwegian national grid onshore. An equivalent circuit of the VSC in synchronous d-q reference frame has been established and decoupled control of active and reactive power was developed. A three terminal VSC-HVDC was modeled and simulated in EMTDC/PSCAD software. Voltage margin method has been used for reliable operation of the HVDC system without the need of communication. Simulation results show that the proposed multi-terminal VSC-HVDC was able to maintain constant DC voltage operation during load switchings, step changes in power demand and was able to secure power to passive loads during loss of a DC voltage regulating VSC-HVDC terminal with out the use of communication between terminals.

	Wind Turbine and Grid Interaction Studies Using Integrated Real-Time Simulation Environment By A. MÃ¤kinen, H. Tuusa	[View] [Download]
Abstract: Knowledge of interactions between wind turbines and network becomes essential as the number of wind turbines installed in the network increases. Thus, a simulation environment with accurate network and wind turbine models is needed. In this paper, a novel real-time simulation environment for wind turbine and grid interaction studies is presented. The network is simulated with Real-Time Digital Simulator (RTDS) and the wind turbine with its power electronic equipments in dSPACE. First, the wind turbine model is introduced. Next, realtime simulation results during three-phase short-circuit and automatic reclosing are presented and compared to Simulink results in order to verify the real-time model. Discussions about the reliability and usefulness of the environment are also performed.

	Selecting the Accurate Solar Panel Simulation Model By Krisztina Leban, Ewen Ritchie	[View] [Download]
Abstract: This paper considers selection of the suitable simulation model for solar panels [1]. Two models for silicon polycrystalline photovoltaic solar cells [2], [3] were analysed. The selection is made by comparing the Power vs. Voltage and Current vs. Voltage curves obtained from the simulation to those obtained experimentally. The goal is to identify if a simulation model gives correct information about the behaviour of one single solar panel for varying temperature and irradiance. Final validation is done by comparing experimental and simulation results. The single panel model was integrated into array of 16 elements. This can be integrated in the simulation of an isolated micro grid or in a hybrid energy system [4], [5] By comparing simulation results from both models with experimental results we can conclude that model 2 is the most reliable one.

	Grid connected Converters for Photovoltaic, State of the Art, Ideas for Improvement of Transformerless Inverters By Fritz Schimpf, Lars E. Norum	[View] [Download]
Abstract: The paper presents a short overview of the state of the art for grid tied PV inverters at low and medium power level (1..100 kW), mainly intended for rooftop applications. The inverters are categorized according to the configuration of the PV system, the configuration of the conversion stages within the inverter and whether they use transformers or not [1], [3]. After the introduction of the state of the art of inverters for PV systems with and without transformers, the paper focuses on some known problems and challenges for transformerless inverters. Topologies without transformers have big advantages like low weight, volume and cost. In addition they often reach higher efficiencies than topologies with transformers. Therefore they are important for future developments.