EPE Association: EPE 2013 - LS6d: Microgrids

EPE 2013 - LS6d: Microgrids
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 16: Power electronics in transmission and distribution > EPE 2013 - LS6d: Microgrids

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   A generalized method to analyze the small-signal stability for a multi-inverter islanded grid with droop controllers
By Stefano LISSANDRON, Alessandro COSTABEBER, Paolo MATTAVELLI [View]
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Abstract: In recent years, the concept of multi-inverter microgrid as the building block for the future distribution system has been commonly accepted and widely studied in literature. One of the recognized advantages of microgrids is the possibility of operate autonomously in absence of the main utility supply. In this case, droop control techniques are the most attractive solution for their capability of operate the microgrid without requiring any communication among the inverters. This paper proposes a simple mathematical model of droop controlled islanded microgrids, with the objective of providing a tool by means of which a microgrid of arbitrary complexity can be modeled, and the local droop controllers of the inverters can be designed to guarantee the small-signal stability and achieve a satisfactory dynamic behaviour. The proposed model has been validated through Matlab/Simulink simulation.

   Control of an 80-kW Wind Turbine Connected to a DC Microgrid
By Michail SEIRAGAKIS, Rodrigo TEIXEIRA PINTO, Pavol BAUER, Michiel DAMEN [View]
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Abstract: The paper main objective is to provide a feasibility study for the connection of a wind turbine to a dcmicrogrid. The wind turbine, provided by WES, uses a squirrel-cage generator, which is a given projectvariable. Hence, the main aspects which determines the performance of the the wind turbine connectionto the dc microgrid are related with the turbine control – such as the maximum power point tracking(MPPT) system and pitch control – and other relevant mechanical and electrical components, such asthe generator and the ac-dc converter. Additionally, a dynamic analysis is performed to select a powerconversion unit – dc-dc converter – which is able to provide energy with high quality standards from thewind turbine to the dc microgrid. Based on the selected power convertion unit, a control strategy for thecomplete wind energy conversion system – from wind turbine to the dc microgrid – is developed. For theselected wind energy conversion system configuration, measurements performed on a real wind turbineare used in a hybrid simulation to validate the developed dc microgrid control and dynamic models.

   Modular d-q frame small-signal modeling and analysis of a microgrid.
By Virgilio VALDIVIA, Francisco GONZALEZ-ESPIN, Nicolas CHANG, Raymond FOLEY [View]
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Abstract: In this paper, a systematic, scalable small-signal modelling approach for microgrids is described. First, each subsystem is modelled separately, and then all are interfaced using Simulink Control Design Toolbox. The main advantage of this method is its practicality, as analytical models of whole microgrids are derived systematically and easily. A real microgrid is modelled and the presented method is applied to perform analysis both at subsystem-level (control design) and at system-level (microgrid stability). Also, experimental operation of the microgrid is illustrated.

EPE 2013 - LS6d: Microgrids
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 16: Power electronics in transmission and distribution > EPE 2013 - LS6d: Microgrids
	[return to parent folder]

	A generalized method to analyze the small-signal stability for a multi-inverter islanded grid with droop controllers By Stefano LISSANDRON, Alessandro COSTABEBER, Paolo MATTAVELLI	[View] [Download]
Abstract: In recent years, the concept of multi-inverter microgrid as the building block for the future distribution system has been commonly accepted and widely studied in literature. One of the recognized advantages of microgrids is the possibility of operate autonomously in absence of the main utility supply. In this case, droop control techniques are the most attractive solution for their capability of operate the microgrid without requiring any communication among the inverters. This paper proposes a simple mathematical model of droop controlled islanded microgrids, with the objective of providing a tool by means of which a microgrid of arbitrary complexity can be modeled, and the local droop controllers of the inverters can be designed to guarantee the small-signal stability and achieve a satisfactory dynamic behaviour. The proposed model has been validated through Matlab/Simulink simulation.

	Control of an 80-kW Wind Turbine Connected to a DC Microgrid By Michail SEIRAGAKIS, Rodrigo TEIXEIRA PINTO, Pavol BAUER, Michiel DAMEN	[View] [Download]
Abstract: The paper main objective is to provide a feasibility study for the connection of a wind turbine to a dcmicrogrid. The wind turbine, provided by WES, uses a squirrel-cage generator, which is a given projectvariable. Hence, the main aspects which determines the performance of the the wind turbine connectionto the dc microgrid are related with the turbine control – such as the maximum power point tracking(MPPT) system and pitch control – and other relevant mechanical and electrical components, such asthe generator and the ac-dc converter. Additionally, a dynamic analysis is performed to select a powerconversion unit – dc-dc converter – which is able to provide energy with high quality standards from thewind turbine to the dc microgrid. Based on the selected power convertion unit, a control strategy for thecomplete wind energy conversion system – from wind turbine to the dc microgrid – is developed. For theselected wind energy conversion system configuration, measurements performed on a real wind turbineare used in a hybrid simulation to validate the developed dc microgrid control and dynamic models.

	Modular d-q frame small-signal modeling and analysis of a microgrid. By Virgilio VALDIVIA, Francisco GONZALEZ-ESPIN, Nicolas CHANG, Raymond FOLEY	[View] [Download]
Abstract: In this paper, a systematic, scalable small-signal modelling approach for microgrids is described. First, each subsystem is modelled separately, and then all are interfaced using Simulink Control Design Toolbox. The main advantage of this method is its practicality, as analytical models of whole microgrids are derived systematically and easily. A real microgrid is modelled and the presented method is applied to perform analysis both at subsystem-level (control design) and at system-level (microgrid stability). Also, experimental operation of the microgrid is illustrated.