EPE Association: EPE 2022 - DS3m: DC Grids including Fault Coordination and Protection

EPE 2022 - DS3m: DC Grids including Fault Coordination and Protection
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 07: Power Supplies > EPE 2022 - DS3m: DC Grids including Fault Coordination and Protection

   [return to parent folder]

   DC-MMC with reduced number of sub-modules providing fault blocking capability in HVDC Grids
By Juan PAEZ [View]
[Download]

Abstract: The capability of DC-DC converters to block DC faults is an important issue for the development of HVDC grids. To include such feature, converters are generally oversized in terms of components by adding more semiconductors than needed in normal operation. This paper proposes to use a main switch instead of adding sub-modules in the topology to provide fault blocking capability. A converter control method is proposed to open the switch at zero current; thus, no breaking capability is required. An analysis on the impact on the converter design and a comparison with the classical solution are done. The operation of the proposed solution is verified through transient simulations. In the analysis, the requirements in terms of opening time for the switch were determined to be around 1 ms to 6 ms, which is feasible with a fast disconnector. However, the required control to keep the current on the switch at zero amps adds constraints to the lower arms of the topology in terms of installed capacitance and current withstanding.

   New Topology of Superconducting Fault Current Limiter with Bypass Resistor
By Svetlana BRONSHTEIN [View]
[Download]

Abstract: This paper presents a new type of bridge type SFCL with a bypass resistor. The proposed topology overcomes the drawbacks of the conventional diode bridge SFCL that can limit the fault current only during the first cycles. The proposed SFCL can limit the fault current also in the following subsequent cycles. Extensive simulations validate the proposed topology and demonstrate its advantages. The simulation results are discussed and compared to the conventional diode bridge topology. The conclusions are presented at the end of the paper.

   Particular Requirements on Drive Inverters for Safe and Robust Operation on an Open Industrial DC Grid
By Simon PULS [View]
[Download]

Abstract: Today DC offers far-reaching advantages over AC. Therefore, many devices have been equipped with an internal DC link for years.In the field of energy supply, the use of DC technology is also growing and is state of the art e.g. in offshore, high-voltage, automotive and data center applications.The spread of industrial open DC grids is currently starting and is completely different due to the requirements:The DC grid itself and energy flows in an industrial environment are highly dynamic and bidirectional.Due to the low impedance electrical connection of the DC links of many devices, stored energies in fault cases as well as ripple currents during operation place particular requirements on the devices.

EPE 2022 - DS3m: DC Grids including Fault Coordination and Protection
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 07: Power Supplies > EPE 2022 - DS3m: DC Grids including Fault Coordination and Protection
	[return to parent folder]

	DC-MMC with reduced number of sub-modules providing fault blocking capability in HVDC Grids By Juan PAEZ	[View] [Download]
Abstract: The capability of DC-DC converters to block DC faults is an important issue for the development of HVDC grids. To include such feature, converters are generally oversized in terms of components by adding more semiconductors than needed in normal operation. This paper proposes to use a main switch instead of adding sub-modules in the topology to provide fault blocking capability. A converter control method is proposed to open the switch at zero current; thus, no breaking capability is required. An analysis on the impact on the converter design and a comparison with the classical solution are done. The operation of the proposed solution is verified through transient simulations. In the analysis, the requirements in terms of opening time for the switch were determined to be around 1 ms to 6 ms, which is feasible with a fast disconnector. However, the required control to keep the current on the switch at zero amps adds constraints to the lower arms of the topology in terms of installed capacitance and current withstanding.

	New Topology of Superconducting Fault Current Limiter with Bypass Resistor By Svetlana BRONSHTEIN	[View] [Download]
Abstract: This paper presents a new type of bridge type SFCL with a bypass resistor. The proposed topology overcomes the drawbacks of the conventional diode bridge SFCL that can limit the fault current only during the first cycles. The proposed SFCL can limit the fault current also in the following subsequent cycles. Extensive simulations validate the proposed topology and demonstrate its advantages. The simulation results are discussed and compared to the conventional diode bridge topology. The conclusions are presented at the end of the paper.

	Particular Requirements on Drive Inverters for Safe and Robust Operation on an Open Industrial DC Grid By Simon PULS	[View] [Download]
Abstract: Today DC offers far-reaching advantages over AC. Therefore, many devices have been equipped with an internal DC link for years.In the field of energy supply, the use of DC technology is also growing and is state of the art e.g. in offshore, high-voltage, automotive and data center applications.The spread of industrial open DC grids is currently starting and is completely different due to the requirements:The DC grid itself and energy flows in an industrial environment are highly dynamic and bidirectional.Due to the low impedance electrical connection of the DC links of many devices, stored energies in fault cases as well as ripple currents during operation place particular requirements on the devices.