EPE Association: EPE 2021 - Power Electronics in Transmission and Distribution Systems

EPE 2021 - Power Electronics in Transmission and Distribution Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2021 ECCE Europe - Conference > EPE 2021 - Topic 07: Power Supplies > EPE 2021 - Power Electronics in Transmission and Distribution Systems

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   Assessment of Power Electronics Converters for HVDC series tapping station
By Djamel HADBI [View]
[Download]

Abstract: This article assesses the power electronic converters for HVDC tapping stations. Firstly, it comparesparallel and series tapping stations to show the potential benefits of the last ones. Then, an original series converter based on a Current Source Alternate Arm Converter (CSAAC) is compared to a commonVoltage Source Modular Multilevel Converter (VSMMC). It shows that the former requires little industrial effort whereas the latter, less mature, outperforms its predecessors in many criteria.

   Overvoltages and Overcurrents in HV/MV Hybrid Transformers due to Grid Faults
By Adrian WIEMER [View]
[Download]

Abstract: Power electronic converters in grid applications as for example hybrid transformers are vulnerable to grid faults, so that a protection system is required. This paper identifies critical overcurrents and overvoltages due to grid faults and presents grid models to calculate the overcurrents and a high frequency transformer model to calculate the overvoltages, in order to derive requirements/specifications for designingprotection systems.

   Passivity characterization of grid-forming converters with fault-ride through capability
By Mebtu BEZA [View]
[Download]

Abstract: Due to the increase in the use of renewable energy sources (RES) and a corresponding reduction inthe conventional energy generation systems, there is nowadays a demand from the power-electronicconverters to provide grid-forming properties through proper control of the converter systems. Thispaper aims at evaluating the impact of various control loops of a grid-forming control strategy equippedwith a fault-ride through capability on the passivity properties of the converter system. Through theanalysis of the frequency-dependent input admittance of the converter, the main factors affecting thepassivity property are identified. A simplified analytical model has been derived in order to proposepossible control modifications to enhance system's passivity at various frequencies of interest and thefindings are verified through detailed time-domain simulations and experiments.

   Tuning and evaluation of grid-forming converters for grid-support
By Anant NARULA [View]
[Download]

Abstract: Grid-forming converters interfacing renewable energy sources to the power system have emerged in recent years to account for the reduction of the conventional synchronous generators in the power system. This paper proposes a new structure and tuning approach for the active power controller of grid-forming converters. This is aimed at reducing the overshoot in the step-response of the active power controller, which is typically observed with other structures found in the literature. In order to ensure robustness of the proposed controller, the dynamic response of the active power injected by the converter is evaluated at various short-circuit ratio (SCR) of the grid. In addition, the performance of the converter system is investigated during parallel operation of converters in both grid-connected as well as islanded modes. Finally, the analytical findings are verified using detailed time-domain simulations in PSCAD.

EPE 2021 - Power Electronics in Transmission and Distribution Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2021 ECCE Europe - Conference > EPE 2021 - Topic 07: Power Supplies > EPE 2021 - Power Electronics in Transmission and Distribution Systems
	[return to parent folder]

	Assessment of Power Electronics Converters for HVDC series tapping station By Djamel HADBI	[View] [Download]
Abstract: This article assesses the power electronic converters for HVDC tapping stations. Firstly, it comparesparallel and series tapping stations to show the potential benefits of the last ones. Then, an original series converter based on a Current Source Alternate Arm Converter (CSAAC) is compared to a commonVoltage Source Modular Multilevel Converter (VSMMC). It shows that the former requires little industrial effort whereas the latter, less mature, outperforms its predecessors in many criteria.

	Overvoltages and Overcurrents in HV/MV Hybrid Transformers due to Grid Faults By Adrian WIEMER	[View] [Download]
Abstract: Power electronic converters in grid applications as for example hybrid transformers are vulnerable to grid faults, so that a protection system is required. This paper identifies critical overcurrents and overvoltages due to grid faults and presents grid models to calculate the overcurrents and a high frequency transformer model to calculate the overvoltages, in order to derive requirements/specifications for designingprotection systems.

	Passivity characterization of grid-forming converters with fault-ride through capability By Mebtu BEZA	[View] [Download]
Abstract: Due to the increase in the use of renewable energy sources (RES) and a corresponding reduction inthe conventional energy generation systems, there is nowadays a demand from the power-electronicconverters to provide grid-forming properties through proper control of the converter systems. Thispaper aims at evaluating the impact of various control loops of a grid-forming control strategy equippedwith a fault-ride through capability on the passivity properties of the converter system. Through theanalysis of the frequency-dependent input admittance of the converter, the main factors affecting thepassivity property are identified. A simplified analytical model has been derived in order to proposepossible control modifications to enhance system's passivity at various frequencies of interest and thefindings are verified through detailed time-domain simulations and experiments.

	Tuning and evaluation of grid-forming converters for grid-support By Anant NARULA	[View] [Download]
Abstract: Grid-forming converters interfacing renewable energy sources to the power system have emerged in recent years to account for the reduction of the conventional synchronous generators in the power system. This paper proposes a new structure and tuning approach for the active power controller of grid-forming converters. This is aimed at reducing the overshoot in the step-response of the active power controller, which is typically observed with other structures found in the literature. In order to ensure robustness of the proposed controller, the dynamic response of the active power injected by the converter is evaluated at various short-circuit ratio (SCR) of the grid. In addition, the performance of the converter system is investigated during parallel operation of converters in both grid-connected as well as islanded modes. Finally, the analytical findings are verified using detailed time-domain simulations in PSCAD.