EPE Association: EPE 2023 - DS1o: AC and DC Distribution and Micro Grids, including Fault Coordination and Protection

EPE 2023 - DS1o: AC and DC Distribution and Micro Grids, including Fault Coordination and Protection
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 07: Power Supplies > EPE 2023 - DS1o: AC and DC Distribution and Micro Grids, including Fault Coordination and Protection

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   A Feasible Region Analysis and Design Method for Virtual Inertia and Damping in Virtual DC Machine Control Strategy
By Lizheng SUN, Feng WANG, Ziyi XU, Fang ZHUO [View]
[Download]

Abstract: This paper proposes a parameter design method for virtual inertia and damping in virtual DC machine (VDCM) control. First, the VDCM control strategy is proposed and its detailed small signal model is established to analyze the dynamic characteristics of the DC bus voltage. Then a second-order simplified model is developed and the dynamic response indicators are calculated. Based on the quantitative relationship between VDCM control parameters and the DC bus voltage dynamic performance, the feasible region of VDCM parameters is constructed to guide the parameter design. Simulation results verify the effectiveness of the propsoed optimisation methods for VDCM control parameters.

   Adaptive Multi-Agent-Zonal Protection Scheme for AC Microgrids
By Jorge DE LA CRUZ, Eduardo GOMEZ-LUNA, John E. CANDELO-BECERRA, Juan C. VASQUEZ, Josep M. GUERRERO [View]
[Download]

Abstract: This study aims to develop an adaptive protection scheme that guarantees the correct operation of electrical protections for a microgrid (MG), according to its topological changes. For this purpose, the concept of multi-agent decentralized adaptive protection is used through the Gaia methodology, which offers autonomy in the decision-making process. The IEEE 13 Node Test Feeder network is used to evaluate the electrical protections operation, and six directional overcurrent relays (50/51/67) were integrated to protect the necessary system areas. It is shown that the inclusion of distributed energy resources (DER) in the network modifies the nominal currents in each relays proposed and cause loss of selectivity and coordination of the scheme. The proposed algorithm is adequate, and its behaviour could be evidenced through tests carried out offline using the ETAP RT software and in real-time simulation using the Hypersim software.

   Comparative study of voltage regulation in distribution grid based on power electronic devices connected on the LV side of the MV/LV transformer
By Sabine VIEIRA REINERT FRELLO, David FREY, Yvon BESANGER, Nouredine HADJSAID, Michel CORDONNIER, Guillaume LANGLET, Leonard BACAUD [View]
[Download]

Abstract: This paper presents a theoretical analysis of voltage regulation methods based on power converters that inject power on the LV side of the MV/LV transformer. Different converter connections are explored, either series, parallel or mixed. Analysis have been conducted in order to check the efficiency of the different solutions and their limitations, considering the structure complexity and the installed power. Concerning the purely reactive compensation systems, the results show that the mixed compensation structure based on both series and parallel has the greatest impact on grid voltage regulation, but that a structure allowing to exchange both active and reactive power could be even more effective. A prototype has been developed to present a simple and efficient way to do this regulation.

   Comparison of two flywheel concepts for the support of microgrids
By Hendrik FEHR, Albrecht GENSIOR, Tobias HEIDRICH, Andreas MÖCKEL [View]
[Download]

Abstract: Two flywheel storage concepts for microgrid integration are analyzed: fully-rated and split power conversion. The latter concept offers a cost reduction of the power electronic components. The results indicate an attractive tradeoff between converter cost and flywheel size at the same total effort for the electrical machines.

   Functional Features of Isolated AC/DC Converter Interface in Future Low-Voltage DC Microgrids
By Vladan LAZAREVIC, Markus ABPLANALP, Francisco CANALES, Mario SCHWEIZER, Antonello ANTONIAZZI, Luca GHEZZI [View]
[Download]

Abstract: In order to decouple dynamics of low-voltageDC microgrids and the AC utility grid and applyspecific grounding configurations, it is required that theAC/DC converter interface features transformer galvanicisolation. This paper proposes a simple, bidirectional,two-stage converter topology with an active front-endAC/DC stage followed by an isolated, resonant DC/DCconverter, operated as a DC transformer. The isolatedAC/DC interface features droop control implemented usinga minimized set of measurements and feedback loops.Theoretical considerations are backed up with simulationresults for different power levels, justifying the feasibilityof the proposed converter topology and the droop controlstrategy for the given purpose.

   gG and aR fuse DC arcing model for converter sizing
By Frédéric REYMOND-LARUINA, Nathalie BARNEL, Djamel HADBI, Loïc QUEVAL, Philippe EGROT, Marc PETIT [View]
[Download]

Abstract: The sizing of AC/DC converter in the context of LVDC distribution grid represents a new challenge. This paper suggests a DC arcing model based on measurements to determine gG and aR fuses behavior, and it is applied to the sizing of a two-level voltage source converter (2L-VSC).

   Method for creating fast controlled transitions within multilevel converter-based DC grids
By Tuan Minh NGUYEN, Jose-Luis MARQUES-LOPEZ, Claus HILLERMEIER [View]
[Download]

Abstract: For a Multi-terminal DC grid coupled to AC networks via Modular Multilevel Converters, a computionally efficient method is presented for generating fast and smooth transitions between different steady states. The final energies of all power converters can be freely chosen and controlled, and no oscillating modes of the grid are excited.

   Modeling Inrush Currents in Medium-Voltage Grids
By Lars HAGEMANN, Katharina HETZENECKER, Julius KLEUTGENS, Rik W. DE DONCKER [View]
[Download]

Abstract: This paper investigates inrush-currentevents during reconnection of medium-voltage gridsegments for a conventional grid and a converter fedmicrogrid setup. A transformer saturation and gridformingconverter model were developed to reproduce theinrush-current behavior observed during measurements.Worst-case parameters affecting the inrush current werederived.

   Probabilistic Mapping of Stability and Reliability in Microgrids - A Bayesian Interpretation
By Yubo SONG, Subham SAHOO, Yongheng YANG, Frede BLAABJERG [View]
[Download]

Abstract: Stability and reliability are vital performance metrics for microgrid systems, while their interdependency on each other has not been well addressed. This paper thereby explains the relationships between them from a conditional perspective using the Bayesian inference, where the observed stability performance influences the evaluation of system reliability. A DC-AC converter system considering the degradation of filter capacitors is exemplified to illustrate the reliability under stability conditions, with simulation and experimental results provided in order to demonstrate the basic idea.

   Virtual Impedance Control for Load Sharing and Bus Voltage Quality Improvement
By Junjie XIAO, Lu WANG, Zian QIN, Pavol BAUER [View]
[Download]

Abstract: This paper proposes a virtual impedance reshaping strategy to share active and harmonic power while promoting the PCC voltage quality. Moreover, the suggested method is resilient to cyber-attacks and immune to communication interruption and delay. Furthermore, it significantly reduces the communication burden. Experiments verify the effectiveness.

EPE 2023 - DS1o: AC and DC Distribution and Micro Grids, including Fault Coordination and Protection
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 07: Power Supplies > EPE 2023 - DS1o: AC and DC Distribution and Micro Grids, including Fault Coordination and Protection
	[return to parent folder]

	A Feasible Region Analysis and Design Method for Virtual Inertia and Damping in Virtual DC Machine Control Strategy By Lizheng SUN, Feng WANG, Ziyi XU, Fang ZHUO	[View] [Download]
Abstract: This paper proposes a parameter design method for virtual inertia and damping in virtual DC machine (VDCM) control. First, the VDCM control strategy is proposed and its detailed small signal model is established to analyze the dynamic characteristics of the DC bus voltage. Then a second-order simplified model is developed and the dynamic response indicators are calculated. Based on the quantitative relationship between VDCM control parameters and the DC bus voltage dynamic performance, the feasible region of VDCM parameters is constructed to guide the parameter design. Simulation results verify the effectiveness of the propsoed optimisation methods for VDCM control parameters.

	Adaptive Multi-Agent-Zonal Protection Scheme for AC Microgrids By Jorge DE LA CRUZ, Eduardo GOMEZ-LUNA, John E. CANDELO-BECERRA, Juan C. VASQUEZ, Josep M. GUERRERO	[View] [Download]
Abstract: This study aims to develop an adaptive protection scheme that guarantees the correct operation of electrical protections for a microgrid (MG), according to its topological changes. For this purpose, the concept of multi-agent decentralized adaptive protection is used through the Gaia methodology, which offers autonomy in the decision-making process. The IEEE 13 Node Test Feeder network is used to evaluate the electrical protections operation, and six directional overcurrent relays (50/51/67) were integrated to protect the necessary system areas. It is shown that the inclusion of distributed energy resources (DER) in the network modifies the nominal currents in each relays proposed and cause loss of selectivity and coordination of the scheme. The proposed algorithm is adequate, and its behaviour could be evidenced through tests carried out offline using the ETAP RT software and in real-time simulation using the Hypersim software.

	Comparative study of voltage regulation in distribution grid based on power electronic devices connected on the LV side of the MV/LV transformer By Sabine VIEIRA REINERT FRELLO, David FREY, Yvon BESANGER, Nouredine HADJSAID, Michel CORDONNIER, Guillaume LANGLET, Leonard BACAUD	[View] [Download]
Abstract: This paper presents a theoretical analysis of voltage regulation methods based on power converters that inject power on the LV side of the MV/LV transformer. Different converter connections are explored, either series, parallel or mixed. Analysis have been conducted in order to check the efficiency of the different solutions and their limitations, considering the structure complexity and the installed power. Concerning the purely reactive compensation systems, the results show that the mixed compensation structure based on both series and parallel has the greatest impact on grid voltage regulation, but that a structure allowing to exchange both active and reactive power could be even more effective. A prototype has been developed to present a simple and efficient way to do this regulation.

	Comparison of two flywheel concepts for the support of microgrids By Hendrik FEHR, Albrecht GENSIOR, Tobias HEIDRICH, Andreas MÖCKEL	[View] [Download]
Abstract: Two flywheel storage concepts for microgrid integration are analyzed: fully-rated and split power conversion. The latter concept offers a cost reduction of the power electronic components. The results indicate an attractive tradeoff between converter cost and flywheel size at the same total effort for the electrical machines.

	Functional Features of Isolated AC/DC Converter Interface in Future Low-Voltage DC Microgrids By Vladan LAZAREVIC, Markus ABPLANALP, Francisco CANALES, Mario SCHWEIZER, Antonello ANTONIAZZI, Luca GHEZZI	[View] [Download]
Abstract: In order to decouple dynamics of low-voltageDC microgrids and the AC utility grid and applyspecific grounding configurations, it is required that theAC/DC converter interface features transformer galvanicisolation. This paper proposes a simple, bidirectional,two-stage converter topology with an active front-endAC/DC stage followed by an isolated, resonant DC/DCconverter, operated as a DC transformer. The isolatedAC/DC interface features droop control implemented usinga minimized set of measurements and feedback loops.Theoretical considerations are backed up with simulationresults for different power levels, justifying the feasibilityof the proposed converter topology and the droop controlstrategy for the given purpose.

	gG and aR fuse DC arcing model for converter sizing By Frédéric REYMOND-LARUINA, Nathalie BARNEL, Djamel HADBI, Loïc QUEVAL, Philippe EGROT, Marc PETIT	[View] [Download]
Abstract: The sizing of AC/DC converter in the context of LVDC distribution grid represents a new challenge. This paper suggests a DC arcing model based on measurements to determine gG and aR fuses behavior, and it is applied to the sizing of a two-level voltage source converter (2L-VSC).

	Method for creating fast controlled transitions within multilevel converter-based DC grids By Tuan Minh NGUYEN, Jose-Luis MARQUES-LOPEZ, Claus HILLERMEIER	[View] [Download]
Abstract: For a Multi-terminal DC grid coupled to AC networks via Modular Multilevel Converters, a computionally efficient method is presented for generating fast and smooth transitions between different steady states. The final energies of all power converters can be freely chosen and controlled, and no oscillating modes of the grid are excited.

	Modeling Inrush Currents in Medium-Voltage Grids By Lars HAGEMANN, Katharina HETZENECKER, Julius KLEUTGENS, Rik W. DE DONCKER	[View] [Download]
Abstract: This paper investigates inrush-currentevents during reconnection of medium-voltage gridsegments for a conventional grid and a converter fedmicrogrid setup. A transformer saturation and gridformingconverter model were developed to reproduce theinrush-current behavior observed during measurements.Worst-case parameters affecting the inrush current werederived.

	Probabilistic Mapping of Stability and Reliability in Microgrids - A Bayesian Interpretation By Yubo SONG, Subham SAHOO, Yongheng YANG, Frede BLAABJERG	[View] [Download]
Abstract: Stability and reliability are vital performance metrics for microgrid systems, while their interdependency on each other has not been well addressed. This paper thereby explains the relationships between them from a conditional perspective using the Bayesian inference, where the observed stability performance influences the evaluation of system reliability. A DC-AC converter system considering the degradation of filter capacitors is exemplified to illustrate the reliability under stability conditions, with simulation and experimental results provided in order to demonstrate the basic idea.

	Virtual Impedance Control for Load Sharing and Bus Voltage Quality Improvement By Junjie XIAO, Lu WANG, Zian QIN, Pavol BAUER	[View] [Download]
Abstract: This paper proposes a virtual impedance reshaping strategy to share active and harmonic power while promoting the PCC voltage quality. Moreover, the suggested method is resilient to cyber-attacks and immune to communication interruption and delay. Furthermore, it significantly reduces the communication burden. Experiments verify the effectiveness.