EPE Association: EPE 2023 - LS1e: DC Distribution & Microgrids Protection

EPE 2023 - LS1e: DC Distribution & Microgrids 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 - LS1e: DC Distribution & Microgrids Protection

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   Efficient Control Parameter Improvements for Inverter-Based Island Grids by Means of Eigenvalue Analysis
By Lasse GNAERIG, Robin WEISS, Andreas HOFFMANN, Steffen BERNET [View]
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Abstract: This paper proposes a target-oriented ap_proach for quick parameter adjustments of controllers forgrid-forming converter systems. By combining parametersensitivity analysis with participation factors, the methodidentifies states and controller instances contributing tounfavorable system behavior. Accounting for eigenvaluedamping ratio sensitivity, it overcomes the comparabilityissue of sensitivity parameters. Visualizing participationfactors and eigenvalue sensitivities enables engineers toquickly modify control systems. Simulations demonstratethe method's effectiveness in identifying critical param_eters and suggesting adjustments for improved systemperformance. This approach offers a practical tool forengineers dealing with the challenges of grid-formingconverter control system design.

   Faults current limitation in a Railway DC substation based on Superconducting technology
By Willy Magloire NKOUNGA, Khaled ALMAKSOUR, Arnaud ALLAIS, Hervé CARON, Christophe SAUDEMONT, Benoit ROBYNS [View]
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Abstract: To meet the high transport demand in the urban areas, railway companies are required to increasetrain traffic and particularly the feeder power that supplies the trains. Increasing DC power leads to rising fault currents in the substations that can exceed 110 kA. The main purpose of this study is to limit fault current and optimise rectifier diode (I2t) in the DC substation for railway networks. This limitation will enable to reduce the oversize of the network components, to minimise their investmentand their maintenance costs. A resistive superconducting fault current limiter is used. First, the DC substation with and without faults current is modelled using EMPTP-RV software. A detailed model of the superconducting limiter based on REBCO tapes is then modelled using Matlab software. Results from REBCO models are integrated into the substation under faults conditions and then optimised to achieve the required limitation. A case study is carried out using the SNCF network in Paris. Results show 50\% faults limitation and 23.75\% I2t optimisation of rectifier diode in transient regime.

   Ground Fault Current Control via Voltage Source Converters using Virtual Impedances in the Zero Sequence
By Florian MAHR, Johann JAEGER [View]
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Abstract: State of the art voltage source converters (VSCs) are commonly not able to feed ground fault currents by themselves. In case of a ground fault, the zero sequence currents in VSC-fed grids are achieved by the star point connection of the upstream transformer. For example, a dedicated compensation coil connected to the transformer star point establishes the ground fault compensation for arc suppression. Thus, grids with direct-connected VSCs without upstream transformers or star point facilities can only be operated with insulated star point up to now. This paper presents a VSC, which is able to control the ground fault current using a virtual impedance (VI). The VSC is taking over the function of the arc suppression coil exemplary. No transformer star point for the connection of the arc suppression coil is needed any more. The VSC emulates the characteristics of the compensation inductance in the zero sequence. It fulfils the function of the arc suppression coil. The results are validated by EMT simulations and show a promising use of direct-connected VSCs in case of ground faults.

EPE 2023 - LS1e: DC Distribution & Microgrids 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 - LS1e: DC Distribution & Microgrids Protection
	[return to parent folder]

	Efficient Control Parameter Improvements for Inverter-Based Island Grids by Means of Eigenvalue Analysis By Lasse GNAERIG, Robin WEISS, Andreas HOFFMANN, Steffen BERNET	[View] [Download]
Abstract: This paper proposes a target-oriented ap_proach for quick parameter adjustments of controllers forgrid-forming converter systems. By combining parametersensitivity analysis with participation factors, the methodidentifies states and controller instances contributing tounfavorable system behavior. Accounting for eigenvaluedamping ratio sensitivity, it overcomes the comparabilityissue of sensitivity parameters. Visualizing participationfactors and eigenvalue sensitivities enables engineers toquickly modify control systems. Simulations demonstratethe method's effectiveness in identifying critical param_eters and suggesting adjustments for improved systemperformance. This approach offers a practical tool forengineers dealing with the challenges of grid-formingconverter control system design.

	Faults current limitation in a Railway DC substation based on Superconducting technology By Willy Magloire NKOUNGA, Khaled ALMAKSOUR, Arnaud ALLAIS, Hervé CARON, Christophe SAUDEMONT, Benoit ROBYNS	[View] [Download]
Abstract: To meet the high transport demand in the urban areas, railway companies are required to increasetrain traffic and particularly the feeder power that supplies the trains. Increasing DC power leads to rising fault currents in the substations that can exceed 110 kA. The main purpose of this study is to limit fault current and optimise rectifier diode (I2t) in the DC substation for railway networks. This limitation will enable to reduce the oversize of the network components, to minimise their investmentand their maintenance costs. A resistive superconducting fault current limiter is used. First, the DC substation with and without faults current is modelled using EMPTP-RV software. A detailed model of the superconducting limiter based on REBCO tapes is then modelled using Matlab software. Results from REBCO models are integrated into the substation under faults conditions and then optimised to achieve the required limitation. A case study is carried out using the SNCF network in Paris. Results show 50\% faults limitation and 23.75\% I2t optimisation of rectifier diode in transient regime.

	Ground Fault Current Control via Voltage Source Converters using Virtual Impedances in the Zero Sequence By Florian MAHR, Johann JAEGER	[View] [Download]
Abstract: State of the art voltage source converters (VSCs) are commonly not able to feed ground fault currents by themselves. In case of a ground fault, the zero sequence currents in VSC-fed grids are achieved by the star point connection of the upstream transformer. For example, a dedicated compensation coil connected to the transformer star point establishes the ground fault compensation for arc suppression. Thus, grids with direct-connected VSCs without upstream transformers or star point facilities can only be operated with insulated star point up to now. This paper presents a VSC, which is able to control the ground fault current using a virtual impedance (VI). The VSC is taking over the function of the arc suppression coil exemplary. No transformer star point for the connection of the arc suppression coil is needed any more. The VSC emulates the characteristics of the compensation inductance in the zero sequence. It fulfils the function of the arc suppression coil. The results are validated by EMT simulations and show a promising use of direct-connected VSCs in case of ground faults.