EPE Association: EPE 2019 - LS1c: DC Grids: Protections and Control

EPE 2019 - LS1c: DC Grids: Protections and Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 06: Grids, Smart Grids, AC & DC > EPE 2019 - LS1c: DC Grids: Protections and Control

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   Combined Overcurrent Detection for Solid State Breakers in DC Grids
By Stefan HAENSEL [View]
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Abstract: Improved overcurrent detection is required for industrial dc grids. Protection based on voltage measurement between emitter and auxiliary emitter is developed and shows unmatched performance for both accuracy and timing. Limitations are discussed and a complete overcurrent detection technique is designed that adds conventional overcurrent measurement to meet all requirements.

   Multi-line Hybrid DC Circuit Breaker with Low Conduction Loss and Reduced Semiconductor Breaker
By Yushi KOYAMA [View]
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Abstract: We propose a new multi-line hybrid dc circuit breaker (DCCB) for high-voltage dc (HVDC) grids. The proposed hybrid DCCB includes mechanical switches, a semiconductor breaker (SB), and a commutation circuit. In an interruption process, the commutation circuit commutates the fault current from the mechanical switches to the SB, and the SB interrupts the fault current lastly. The conduction loss in a normal power transmission is considerably low, because the current flows through only the mechanical switches.Moreover, the proposed multi-line hybrid DCCB is configured at a dc bus in the HVDC grid and shares the SB with multiple transmission lines. SBs are bulky, because it must withstand a transient interruption voltage (TIV) in the transmission line. Therefore, the proposed topology, sharing the SB with multiple transmission lines, allows for a significant reduction in the number of components of the DCCB.This paper presents the configuration of the proposed hybrid multi-line DCCB and its interruption process. The commutation process is analyzed, and the design method of the commutation circuit is provided. Lastly, a circuit simulation verifies the interruption process of the proposed DCCB.

   RESONANT HYBRID MVDC CIRCUIT BREAKERS WITH IN-LINE INDUCTOR
By Harish KRISHNAMOORTHY [View]
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Abstract: A major challenge facing wider adoption of medium voltage DC (MVDC) systems is reliability. Applications such as subsea oil and gas extraction, offshore wind energy conversion, etc. are very mission critical, and a single fault can lead to heavy losses to revenue, environment or even life. This paper presents two resonant hybrid circuit breaker (CB) technologies, one with a coupled inductor and another with a single inductor in line with the mechanical relay, primarily targeted for MVDC applications. Since the main path of both the concepts contains only the mechanical relay and the resonant inductor, the steady state efficiencies are very high (can be well over 99.9 \%) in MVDC applications. By carefully choosing the inductor and capacitor values, it is also possible to achieve a response time of well within 100 µs. This paper details the design, verification and comparison of the two concepts through simulation.

   Unidirectional Series Interline DC/DC Current Flow Controller for Meshed HVDC grids
By Joan SAU BASSOLS [View]
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Abstract: Meshed High Voltage Direct Current (HVDC) grids may require additional devices such as Current FlowControllers (CFC) or Power Flow Controllers (PFC) that can control the DC currents in order to avoidoverloads and bottlenecks. This paper studies the unidirectional series interline DC/DC CFC topology.Different control modes are considered for the aforementioned converter and it is validated throughsimulation results and a prototype is built and tested in an experimental platform in the laboratory.

EPE 2019 - LS1c: DC Grids: Protections and Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 06: Grids, Smart Grids, AC & DC > EPE 2019 - LS1c: DC Grids: Protections and Control
	[return to parent folder]

	Combined Overcurrent Detection for Solid State Breakers in DC Grids By Stefan HAENSEL	[View] [Download]
Abstract: Improved overcurrent detection is required for industrial dc grids. Protection based on voltage measurement between emitter and auxiliary emitter is developed and shows unmatched performance for both accuracy and timing. Limitations are discussed and a complete overcurrent detection technique is designed that adds conventional overcurrent measurement to meet all requirements.

	Multi-line Hybrid DC Circuit Breaker with Low Conduction Loss and Reduced Semiconductor Breaker By Yushi KOYAMA	[View] [Download]
Abstract: We propose a new multi-line hybrid dc circuit breaker (DCCB) for high-voltage dc (HVDC) grids. The proposed hybrid DCCB includes mechanical switches, a semiconductor breaker (SB), and a commutation circuit. In an interruption process, the commutation circuit commutates the fault current from the mechanical switches to the SB, and the SB interrupts the fault current lastly. The conduction loss in a normal power transmission is considerably low, because the current flows through only the mechanical switches.Moreover, the proposed multi-line hybrid DCCB is configured at a dc bus in the HVDC grid and shares the SB with multiple transmission lines. SBs are bulky, because it must withstand a transient interruption voltage (TIV) in the transmission line. Therefore, the proposed topology, sharing the SB with multiple transmission lines, allows for a significant reduction in the number of components of the DCCB.This paper presents the configuration of the proposed hybrid multi-line DCCB and its interruption process. The commutation process is analyzed, and the design method of the commutation circuit is provided. Lastly, a circuit simulation verifies the interruption process of the proposed DCCB.

	RESONANT HYBRID MVDC CIRCUIT BREAKERS WITH IN-LINE INDUCTOR By Harish KRISHNAMOORTHY	[View] [Download]
Abstract: A major challenge facing wider adoption of medium voltage DC (MVDC) systems is reliability. Applications such as subsea oil and gas extraction, offshore wind energy conversion, etc. are very mission critical, and a single fault can lead to heavy losses to revenue, environment or even life. This paper presents two resonant hybrid circuit breaker (CB) technologies, one with a coupled inductor and another with a single inductor in line with the mechanical relay, primarily targeted for MVDC applications. Since the main path of both the concepts contains only the mechanical relay and the resonant inductor, the steady state efficiencies are very high (can be well over 99.9 \%) in MVDC applications. By carefully choosing the inductor and capacitor values, it is also possible to achieve a response time of well within 100 µs. This paper details the design, verification and comparison of the two concepts through simulation.

	Unidirectional Series Interline DC/DC Current Flow Controller for Meshed HVDC grids By Joan SAU BASSOLS	[View] [Download]
Abstract: Meshed High Voltage Direct Current (HVDC) grids may require additional devices such as Current FlowControllers (CFC) or Power Flow Controllers (PFC) that can control the DC currents in order to avoidoverloads and bottlenecks. This paper studies the unidirectional series interline DC/DC CFC topology.Different control modes are considered for the aforementioned converter and it is validated throughsimulation results and a prototype is built and tested in an experimental platform in the laboratory.