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Rik. W. De Doncker - One of the best experts on this subject based on the ideXlab platform.

  • a high step up ratio soft switching dc dc converter for interconnection of mvdc and hvdc grids
    IEEE Transactions on Power Electronics, 2018
    Co-Authors: Shenghui Cui, Nils Soltau, Rik. W. De Doncker
    Abstract:

    DC grid technology is regarded as a promising solution for future Electric Networks integrating a great amount of renewable energies. It calls for high-efficiency dc–dc converters with high voltage step-up ratio to interconnect medium-voltage (MV) dc distribution grids and high-voltage (HV) dc transmission grids. This paper presents an isolated bidirectional soft-switching dc–dc converter combining two-level converters in parallel on the MV side and a modular multilevel converter (MMC) on the HV side. A dedicated control method of the proposed converter is presented. By the proposed method, a certain reactive current is injected into the MV side by the MMC to ensure soft-switching on the MV side. The proposed converter presents low power-semiconductor total device rating and low semiconductor losses over a wide power range at variable input and output voltages. Simulation of a 50 kV/400 kV, 400 MW converter is conducted to evaluate semiconductor losses and verify the validity of this work.

  • dynamic performance and fault tolerant capability of a tlc mmc hybrid dc dc converter for interconnection of mvdc and hvdc grids
    European Conference on Cognitive Ergonomics, 2017
    Co-Authors: Shenghui Cui, Nils Soltau, Rik. W. De Doncker
    Abstract:

    DC grid technology is regarded as a promising solution for future Electric Networks integrating a great amount of renewable energies. It calls for high-efficiency bidirectional dc-dc converters with a high step-up ratio to interconnect mediumvoltage dc (MVDC) distribution grids and high-voltage dc (HVDC) transmission grids. This paper focuses on dynamic performance and fault-tolerant capability of a highly-efficient isolated bidirectional dc-dc converter for this application which combines two-level converters (TLCs) on the MV side and a modular multilevel converter (MMC) on the HV side. A comprehensive current and capacitor-voltage control strategy is proposed. Based on the proposed control strategy, a fault-tolerant operation method in case of multiple device failures is developed to significantly increase the availability of the converter. Dynamic performance of the TLC-MMC hybrid dc-dc converter interconnecting MVDC and HVDC grids is evaluated by PLECS simulation. The simulation results present satisfying dynamic performance of control and seamless transition into the fault-tolerant operation mode.

  • a high step up ratio soft switching dc dc converter for interconnection of mvdc and hvdc grids
    European Conference on Cognitive Ergonomics, 2016
    Co-Authors: Shenghui Cui, Nils Soltau, Rik. W. De Doncker
    Abstract:

    DC grid technology is regarded as a promising solution for future Electric Networks integrating a great amount of renewable energies. It calls for high efficiency dc-dc converters with high step-up ratio to interconnect medium voltage (MV) dc distribution grids and high voltage (HV) dc transmission grids. This paper presents an isolated soft-switching dc-dc converter combining two-level converters in parallel on MV side and a modular multilevel converter (MMC) on HV side. Moreover, a comprehensive control method of the proposed converter is presented. By the proposed method, a certain reactive current is injected into the MV side by the MMC to ensure soft-switching on MV side. The proposed converter presents low semiconductor losses over a wide power range at variable input/output voltages. Simulations of a 50 kV/400 kV, 400 MW system are conducted to evaluate semiconductor losses and verify the validity of this work.

Shenghui Cui - One of the best experts on this subject based on the ideXlab platform.

  • a high step up ratio soft switching dc dc converter for interconnection of mvdc and hvdc grids
    IEEE Transactions on Power Electronics, 2018
    Co-Authors: Shenghui Cui, Nils Soltau, Rik. W. De Doncker
    Abstract:

    DC grid technology is regarded as a promising solution for future Electric Networks integrating a great amount of renewable energies. It calls for high-efficiency dc–dc converters with high voltage step-up ratio to interconnect medium-voltage (MV) dc distribution grids and high-voltage (HV) dc transmission grids. This paper presents an isolated bidirectional soft-switching dc–dc converter combining two-level converters in parallel on the MV side and a modular multilevel converter (MMC) on the HV side. A dedicated control method of the proposed converter is presented. By the proposed method, a certain reactive current is injected into the MV side by the MMC to ensure soft-switching on the MV side. The proposed converter presents low power-semiconductor total device rating and low semiconductor losses over a wide power range at variable input and output voltages. Simulation of a 50 kV/400 kV, 400 MW converter is conducted to evaluate semiconductor losses and verify the validity of this work.

  • dynamic performance and fault tolerant capability of a tlc mmc hybrid dc dc converter for interconnection of mvdc and hvdc grids
    European Conference on Cognitive Ergonomics, 2017
    Co-Authors: Shenghui Cui, Nils Soltau, Rik. W. De Doncker
    Abstract:

    DC grid technology is regarded as a promising solution for future Electric Networks integrating a great amount of renewable energies. It calls for high-efficiency bidirectional dc-dc converters with a high step-up ratio to interconnect mediumvoltage dc (MVDC) distribution grids and high-voltage dc (HVDC) transmission grids. This paper focuses on dynamic performance and fault-tolerant capability of a highly-efficient isolated bidirectional dc-dc converter for this application which combines two-level converters (TLCs) on the MV side and a modular multilevel converter (MMC) on the HV side. A comprehensive current and capacitor-voltage control strategy is proposed. Based on the proposed control strategy, a fault-tolerant operation method in case of multiple device failures is developed to significantly increase the availability of the converter. Dynamic performance of the TLC-MMC hybrid dc-dc converter interconnecting MVDC and HVDC grids is evaluated by PLECS simulation. The simulation results present satisfying dynamic performance of control and seamless transition into the fault-tolerant operation mode.

  • a high step up ratio soft switching dc dc converter for interconnection of mvdc and hvdc grids
    European Conference on Cognitive Ergonomics, 2016
    Co-Authors: Shenghui Cui, Nils Soltau, Rik. W. De Doncker
    Abstract:

    DC grid technology is regarded as a promising solution for future Electric Networks integrating a great amount of renewable energies. It calls for high efficiency dc-dc converters with high step-up ratio to interconnect medium voltage (MV) dc distribution grids and high voltage (HV) dc transmission grids. This paper presents an isolated soft-switching dc-dc converter combining two-level converters in parallel on MV side and a modular multilevel converter (MMC) on HV side. Moreover, a comprehensive control method of the proposed converter is presented. By the proposed method, a certain reactive current is injected into the MV side by the MMC to ensure soft-switching on MV side. The proposed converter presents low semiconductor losses over a wide power range at variable input/output voltages. Simulations of a 50 kV/400 kV, 400 MW system are conducted to evaluate semiconductor losses and verify the validity of this work.

Nils Soltau - One of the best experts on this subject based on the ideXlab platform.

  • a high step up ratio soft switching dc dc converter for interconnection of mvdc and hvdc grids
    IEEE Transactions on Power Electronics, 2018
    Co-Authors: Shenghui Cui, Nils Soltau, Rik. W. De Doncker
    Abstract:

    DC grid technology is regarded as a promising solution for future Electric Networks integrating a great amount of renewable energies. It calls for high-efficiency dc–dc converters with high voltage step-up ratio to interconnect medium-voltage (MV) dc distribution grids and high-voltage (HV) dc transmission grids. This paper presents an isolated bidirectional soft-switching dc–dc converter combining two-level converters in parallel on the MV side and a modular multilevel converter (MMC) on the HV side. A dedicated control method of the proposed converter is presented. By the proposed method, a certain reactive current is injected into the MV side by the MMC to ensure soft-switching on the MV side. The proposed converter presents low power-semiconductor total device rating and low semiconductor losses over a wide power range at variable input and output voltages. Simulation of a 50 kV/400 kV, 400 MW converter is conducted to evaluate semiconductor losses and verify the validity of this work.

  • dynamic performance and fault tolerant capability of a tlc mmc hybrid dc dc converter for interconnection of mvdc and hvdc grids
    European Conference on Cognitive Ergonomics, 2017
    Co-Authors: Shenghui Cui, Nils Soltau, Rik. W. De Doncker
    Abstract:

    DC grid technology is regarded as a promising solution for future Electric Networks integrating a great amount of renewable energies. It calls for high-efficiency bidirectional dc-dc converters with a high step-up ratio to interconnect mediumvoltage dc (MVDC) distribution grids and high-voltage dc (HVDC) transmission grids. This paper focuses on dynamic performance and fault-tolerant capability of a highly-efficient isolated bidirectional dc-dc converter for this application which combines two-level converters (TLCs) on the MV side and a modular multilevel converter (MMC) on the HV side. A comprehensive current and capacitor-voltage control strategy is proposed. Based on the proposed control strategy, a fault-tolerant operation method in case of multiple device failures is developed to significantly increase the availability of the converter. Dynamic performance of the TLC-MMC hybrid dc-dc converter interconnecting MVDC and HVDC grids is evaluated by PLECS simulation. The simulation results present satisfying dynamic performance of control and seamless transition into the fault-tolerant operation mode.

  • a high step up ratio soft switching dc dc converter for interconnection of mvdc and hvdc grids
    European Conference on Cognitive Ergonomics, 2016
    Co-Authors: Shenghui Cui, Nils Soltau, Rik. W. De Doncker
    Abstract:

    DC grid technology is regarded as a promising solution for future Electric Networks integrating a great amount of renewable energies. It calls for high efficiency dc-dc converters with high step-up ratio to interconnect medium voltage (MV) dc distribution grids and high voltage (HV) dc transmission grids. This paper presents an isolated soft-switching dc-dc converter combining two-level converters in parallel on MV side and a modular multilevel converter (MMC) on HV side. Moreover, a comprehensive control method of the proposed converter is presented. By the proposed method, a certain reactive current is injected into the MV side by the MMC to ensure soft-switching on MV side. The proposed converter presents low semiconductor losses over a wide power range at variable input/output voltages. Simulations of a 50 kV/400 kV, 400 MW system are conducted to evaluate semiconductor losses and verify the validity of this work.

Raphael Rossignol - One of the best experts on this subject based on the ideXlab platform.

  • noise stability and central limit theorems for effective resistance of random Electric Networks
    Annals of Probability, 2016
    Co-Authors: Raphael Rossignol
    Abstract:

    We investigate the (generalized) Walsh decomposition of point-to-point effective resistances on countable random Electric Networks with i.i.d. resistances. We show that it is concentrated on low levels, and thus point-to-point effective resistances are uniformly stable to noise. For graphs that satisfy some homogeneity property, we show in addition that it is concentrated on sets of small diameter. As a consequence, we compute the right order of the variance and prove a central limit theorem for the effective resistance through the discrete torus of side length n in Zd, when n goes to infinity.

Yusheng Xue - One of the best experts on this subject based on the ideXlab platform.

  • beyond smart grid cyber physical social system in energy future
    Proceedings of the IEEE, 2017
    Co-Authors: Yusheng Xue
    Abstract:

    Smart grids (SGs) are Electric Networks that use innovative and intelligent monitoring, control, communication, and self-healing technologies to deliver better connections and operations for generators and distributors, flexible choices for prosumers, and reliability and security of Electricity supply. SGs are a complex cyber–physical system by their very nature, and this has impacted the way energy is generated, transported and used. In our 2016 paper [1] , we examined the SG concept in the context of cyber–physical systems (CPSs), and outlined the challenges ahead alongside with fast development of advanced technologies such as Internet of Things, cloud computing, big data and complex Networks.

  • smart grids a cyber physical systems perspective
    Proceedings of the IEEE, 2016
    Co-Authors: Yusheng Xue
    Abstract:

    Smart grids are Electric Networks that employ advanced monitoring, control, and communication technologies to deliver reliable and secure energy supply, enhance operation efficiency for generators and distributors, and provide flexible choices for prosumers. Smart grids are a combination of complex physical network systems and cyber systems that face many technological challenges. In this paper, we will first present an overview of these challenges in the context of cyber–physical systems. We will then outline potential contributions that cyber–physical systems can make to smart grids, as well as the challenges that smart grids present to cyber–physical systems. Finally, implications of current technological advances to smart grids are outlined.