Dual Channel Control with DC Fault Ride Through for MMC-based, Isolated DC/DC Converter

Dragan Jovcic; Huibin Zhang

doi:10.1109/TPWRD.2017.2675909

Dual Channel Control with DC Fault Ride Through for MMC-based, Isolated DC/DC Converter

Dragan Jovcic, Huibin Zhang

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Abstract

This paper presents the two-channel controller with inner current loops for dual bridge, DC/DC converter, based on MMC (Modular Multilevel Converter) technology. The DC/DC control strategy is based on two inner fast current control loops in dq rotating frame at each of the two MMC bridges. These current controls facilitate operation through DC faults at either DC bus. The active power control is shared by two MMCs, at the slower outer control level. The second outer control loop minimizes losses, which is achieved by feedback control of magnitude of both modulation indices at maximal value of 0.95 at all loading levels. The controller is symmetrical, provides bidirectional power flow and responds equally to faults on either DC bus. Under DC fault conditions, one MMC actively controls the inner AC current, while temporary blocking of MMC on faulted side is required to prevent cell capacitor discharge. The validity of the proposed control is verified on PSCAD using a 600MW, 500kV/640kV test DC/DC model. The controller can be used for control/stability studies with large DC grids that contain DC/DC converters.

Original language	English
Pages (from-to)	1574 - 1582
Number of pages	9
Journal	IEEE Transactions on Power Delivery
Volume	32
Issue number	3
Early online date	1 Mar 2017
DOIs	https://doi.org/10.1109/TPWRD.2017.2675909
Publication status	Published - 1 Jun 2017

Bibliographical note

This study is sponsored by the Engineering and Physical Sciences Research Council (EPSRC) grant no EP/K006428/1, 2013.D. Jovcic and H. Zhang are with the School of Engineering, University of Aberdeen, AB24 3UE, U.K. (d.jovcic@abdn.ac.uk, huibin.zhang@abdn.ac.uk).

Keywords

HVDC transmission
DC-DC power converters
modular multilevel converters
average value model
DC power transmission
Circuit faults
Current control
Bridge circuits
Circuit breakers
Loading

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Accepted author manuscript, 727 KBLicence: Unspecified

Dragan Jovcic
- Engineering, Aberdeen HVDC Research Centre
- Centre for Energy Transition
- Engineering, Engineering - Chair in Engineering
Person: Academic

Cite this

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title = "Dual Channel Control with DC Fault Ride Through for MMC-based, Isolated DC/DC Converter",

abstract = "This paper presents the two-channel controller with inner current loops for dual bridge, DC/DC converter, based on MMC (Modular Multilevel Converter) technology. The DC/DC control strategy is based on two inner fast current control loops in dq rotating frame at each of the two MMC bridges. These current controls facilitate operation through DC faults at either DC bus. The active power control is shared by two MMCs, at the slower outer control level. The second outer control loop minimizes losses, which is achieved by feedback control of magnitude of both modulation indices at maximal value of 0.95 at all loading levels. The controller is symmetrical, provides bidirectional power flow and responds equally to faults on either DC bus. Under DC fault conditions, one MMC actively controls the inner AC current, while temporary blocking of MMC on faulted side is required to prevent cell capacitor discharge. The validity of the proposed control is verified on PSCAD using a 600MW, 500kV/640kV test DC/DC model. The controller can be used for control/stability studies with large DC grids that contain DC/DC converters.",

keywords = "HVDC transmission, DC-DC power converters, modular multilevel converters, average value model, DC power transmission, Circuit faults, Current control, Bridge circuits, Circuit breakers, Loading",

author = "Dragan Jovcic and Huibin Zhang",

note = "This study is sponsored by the Engineering and Physical Sciences Research Council (EPSRC) grant no EP/K006428/1, 2013.D. Jovcic and H. Zhang are with the School of Engineering, University of Aberdeen, AB24 3UE, U.K. (d.jovcic@abdn.ac.uk, huibin.zhang@abdn.ac.uk).",

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N2 - This paper presents the two-channel controller with inner current loops for dual bridge, DC/DC converter, based on MMC (Modular Multilevel Converter) technology. The DC/DC control strategy is based on two inner fast current control loops in dq rotating frame at each of the two MMC bridges. These current controls facilitate operation through DC faults at either DC bus. The active power control is shared by two MMCs, at the slower outer control level. The second outer control loop minimizes losses, which is achieved by feedback control of magnitude of both modulation indices at maximal value of 0.95 at all loading levels. The controller is symmetrical, provides bidirectional power flow and responds equally to faults on either DC bus. Under DC fault conditions, one MMC actively controls the inner AC current, while temporary blocking of MMC on faulted side is required to prevent cell capacitor discharge. The validity of the proposed control is verified on PSCAD using a 600MW, 500kV/640kV test DC/DC model. The controller can be used for control/stability studies with large DC grids that contain DC/DC converters.

AB - This paper presents the two-channel controller with inner current loops for dual bridge, DC/DC converter, based on MMC (Modular Multilevel Converter) technology. The DC/DC control strategy is based on two inner fast current control loops in dq rotating frame at each of the two MMC bridges. These current controls facilitate operation through DC faults at either DC bus. The active power control is shared by two MMCs, at the slower outer control level. The second outer control loop minimizes losses, which is achieved by feedback control of magnitude of both modulation indices at maximal value of 0.95 at all loading levels. The controller is symmetrical, provides bidirectional power flow and responds equally to faults on either DC bus. Under DC fault conditions, one MMC actively controls the inner AC current, while temporary blocking of MMC on faulted side is required to prevent cell capacitor discharge. The validity of the proposed control is verified on PSCAD using a 600MW, 500kV/640kV test DC/DC model. The controller can be used for control/stability studies with large DC grids that contain DC/DC converters.

KW - HVDC transmission

KW - DC-DC power converters

KW - modular multilevel converters

KW - average value model

KW - DC power transmission

KW - Circuit faults

KW - Current control

KW - Bridge circuits

KW - Circuit breakers

KW - Loading

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DO - 10.1109/TPWRD.2017.2675909

M3 - Article

SN - 0885-8977

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JO - IEEE Transactions on Power Delivery

JF - IEEE Transactions on Power Delivery

IS - 3

ER -

Dual Channel Control with DC Fault Ride Through for MMC-based, Isolated DC/DC Converter

Abstract

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Dragan Jovcic

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