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access icon free Hierarchical control strategy for MVDC distribution network under large disturbance

  • Author(s): Yirun Ji 1 ; Zhichang Yuan 2 ; Jianfeng Zhao 1 ; Chao Lu 2 ; Yizhen Wang 3 ; Yuming Zhao 4 ; Yan Li 5 ; Yingduo Han 2
    • View affiliations
  • Source: Volume 12, Issue 11, 19 June 2018, p. 2557 – 2565
    DOI:  10.1049/iet-gtd.2017.1642 , Print ISSN 1751-8687, Online ISSN 1751-8695
© The Institution of Engineering and Technology
Received 18/10/2017, Accepted 13/02/2018, Revised 09/01/2018, Published 03/04/2018

The DC distribution technology brings challenges and opportunities to the penetration of large-scale distributed renewable energy sources. In a medium-voltage DC (MVDC) distribution network, operation mode switch occurs owing to some large disturbances. To manage these disturbances and achieve seamless switch of the operation mode, a hierarchical control strategy with two layers, namely local and global layers, is proposed in this work. The novel local layer controller called P–U–I controller is designed to enhance the voltage stability, improve system controllability and suppress overcurrent under large disturbances. This controller only needs local information and does not rely on fast communication. Furthermore, as the scale of the DC distribution network expands continuously, the number of system operation mode increases in geometric progression. Therefore, a global layer controller based on breadth-first search algorithm is proposed. This controller can automatically identify the system topology and adjust the control mode of converters to optimise the system operating characteristics. Thus, this hierarchical control strategy can accurately control the system power in steady state, suppress overcurrent under large disturbances and suit large-scale DC distribution networks. Finally, a three-terminal MVDC distribution network simulation model established on power systems computer-aided design and RT-LAB validates the proposed strategy.

Inspec keywords: hierarchical systems; power system stability; power distribution control; power distribution faults; tree searching; control system synthesis; power convertors

Other keywords: system operation mode; breadth-first search algorithm; power systems computer-aided design; geometric progression; RT-LAB; disturbance management; hierarchical control strategy; voltage stability enhancement; DC distribution technology; system operating characteristic optimization; system topology; local layer controller; operation mode switch; large-scale distributed renewable energy source penetration; global layers; three-terminal MVDC distribution network simulation model; converters; system controllability; overcurrent suppression; global layer controller; P-U-I controller design

Subjects: Combinatorial mathematics; Distribution networks; Power convertors and power supplies to apparatus; Combinatorial mathematics; Multivariable control systems; Power system control; Control system analysis and synthesis methods; Control of electric power systems

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