Fault mode operation strategies for dual H-bridge current flow controller in meshed HVDC grid

Mokhberdoran, Ataollah; Sau-Bassols, Joan; Prieto‐Araujo, Eduardo; Gomis‐Bellmunt, Oriol; Silva, Nuno; Carvalho, Adriano

doi:10.1016/j.epsr.2018.02.002

Cited by 11 publications

(8 citation statements)

References 23 publications

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“…15, where a current reference for I * 41 is given to the CFC and it is maintained also when the power of the nodes change, demonstrating the current control capability of the device. The coordination between the converter and the protection system is not included in the present paper, but it has been addressed in [58] A experimental prototype of the aforementioned CFC is built and tested in a scaled down DC grid in the laboratory as the one in Fig. 16.…”

Section: A Small Series Connected Interline Convertersmentioning

confidence: 99%

Flexible Converters for Meshed HVDC Grids: From Flexible AC Transmission Systems (FACTS) to Flexible DC Grids

Gomis‐Bellmunt

Sau-Bassols

Prieto‐Araujo

et al. 2020

IEEE Trans. Power Delivery

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112

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Flexible Alternating Current Transmission Systems (FACTS) have achieved to enhance the flexibility of modern AC power systems, by providing fast, reliable and controllable solutions to steer the power flows and voltages in the network. The proliferation of High Voltage Direct Current (HVDC) transmission systems is leading to the opportunity of interconnecting several HVDC systems forming HVDC Supergrids. Such grids can eventually evolve to meshed systems which interconnect a number of different AC power systems and large scale offshore wind (or other renewable sources) power plants and clusters. While such heavily meshed systems can be considered futuristic and will not certainly happen in the near future, the sector is witnessing initial steps in this direction. In order to ensure the flexibility and controllability of meshed DC grids, the shunt connected AC-DC converters can be combined with additional simple and flexible DC-DC converters which can directly control current and power through the lines. The proposed DC-DC converters can provide a range of services to the HVDC grid, including power flow control capability, ancillary services for the HVDC grid or adjacent grids, stability improvement, oscillation damping, pole balancing and voltage control. The present paper presents relevant developments from industry and academia in the direction of the development of these converters, considering technical concepts, converter functionalities and possible integration with other existing systems. The paper explores a possible vision on the development of future meshed HVDC grids and discusses the role of the proposed converters in such grids.

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Section: A Small Series Connected Interline Convertersmentioning

confidence: 99%

Flexible Converters for Meshed HVDC Grids: From Flexible AC Transmission Systems (FACTS) to Flexible DC Grids

Gomis‐Bellmunt

Sau-Bassols

Prieto‐Araujo

et al. 2020

IEEE Trans. Power Delivery

Self Cite

112

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“…6. Although this represents an increase in the number of switches required for the implementation of the multi-port CFC, such protection equipment or a similar one may be also needed for bidirectional multi-port CFCs; since the normal operation switches may not be rated for the fault current, requiring then, another path to divert the current [26].…”

Section: Bypass and Protection Considerationsmentioning

confidence: 99%

“…DC/DC converter based CFCs are connected between DC lines and they can regulate the current flows by exchanging power inside the DC grid [13]- [25]. The behaviour of the DC/DC based CFCs during faults in the HVDC grid is investigated in [17], [26] providing some countermeasures to protect the devices. Also, the integration of the CFC capabilities into the DC Circuit Breakers (DCCB) [27] is analysed in [28], [29] in order to have two functionalities in a single device, thus, reducing the total cost.…”

Section: Introductionmentioning

confidence: 99%

Multiport Interline Current Flow Controller for Meshed HVDC Grids

Sau-Bassols

Ferrer-San-José

Prieto‐Araujo

et al. 2020

IEEE Trans. Ind. Electron.

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In meshed High Voltage Direct Current (HVDC) grids, the current of each line cannot be controlled independently, since it depends on the resistances between nodes. Additional devices, such as Current Flow Controllers (CFCs), may be needed to avoid bottlenecks or line overloads. This work presents a multi-port DC/DC based CFC topology to be connected to lines with unidirectional current flows. The device is able to control the DC lines' currents to the desired value by inserting variable voltage sources in series. First, the modelling of the generic -port topology is presented and then, its modulation and control strategy are described. In the first case study, the concept is validated considering a 5-port CFC by means of dynamic simulations using different control methods. Finally, in the second case study, a 3-port CFC prototype is built and tested in an experimental platform in the laboratory considering different control modes.

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“…This configuration is sufficient to protect the experimental setup as the magnitude and rate of change of the fault current are limited. This follows the approach in [35], where each cable within a dc grid is equipped with circuit breakers to protect the CFC against any overcurrent or overvoltage. Despite its limitations, the experimental setup adopted in this work is adequate to study the effectiveness of the proposed CFC protection scheme under faulty conditions as demonstrated by the experimental results in this section.…”

Section: Behavior Under a Pole-to-pole Faultmentioning

confidence: 99%

Pole Balancing and Thermal Management in Multiterminal HVdc Grids Using Single H-Bridge-Based Current Flow Controllers

Balasubramaniam

Ugalde‐Loo

Liang

et al. 2020

IEEE Trans. Ind. Electron.

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Current flow controllers (CFCs) are power electronics based devices that may remove some technical barriers preventing multi-terminal HVDC (MTDC) grid deployment. In this paper, an inter-line CFC topology is investigated. The single H-bridge CFC (1B-CFC) alters the grid power flow by transferring power between neighboring dc lines. The operation and control of a 1B-CFC under a single modulation scheme is presented. A control strategy has been proposed to provide pole balancing support during imbalance conditions. Small-scale prototypes have been developed to demonstrate the functionality and operational range of the device. To this end, an experimental MTDC grid test-rig has been employed. It is shown that a 1B-CFC could be used to limit the dc line current and, additionally, it could be employed to enable asymmetrical tapping of dc lines. For completeness, the performance of the device has been experimentally validated under line overloading, pole imbalance conditions, and a pole-to-pole dc fault. Index Terms-Current flow controller, H-bridge, multiterminal HVDC grids, voltage source converter.

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Fault mode operation strategies for dual H-bridge current flow controller in meshed HVDC grid

Cited by 11 publications

References 23 publications

Flexible Converters for Meshed HVDC Grids: From Flexible AC Transmission Systems (FACTS) to Flexible DC Grids

Flexible Converters for Meshed HVDC Grids: From Flexible AC Transmission Systems (FACTS) to Flexible DC Grids

Multiport Interline Current Flow Controller for Meshed HVDC Grids

Pole Balancing and Thermal Management in Multiterminal HVdc Grids Using Single H-Bridge-Based Current Flow Controllers

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