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access icon free Reliability evaluation method for AC/DC hybrid distribution power network considering cascaded multiport power electronic transformer

  • Author(s): Yi Liu 1 ; Haibo Li 2 ; Zhanqing Yu 1 ; Rong Zeng 1
    • View affiliations
  • Source: Volume 13, Issue 23, 03 December 2019, p. 5357 – 5364
    DOI:  10.1049/iet-gtd.2018.7035 , Print ISSN 1751-8687, Online ISSN 1751-8695
© The Institution of Engineering and Technology
Received 23/12/2018, Accepted 09/10/2019, Revised 15/08/2019, Published 15/10/2019

With the advantage of high-power supply capacity, low loss in power transmission and distribution process, strong power flow control ability, direct current (DC) distribution network has been one hotspot of the future distribution network. The cascaded multiport power electronic transformer (PET) has been proposed as key equipment for future distribution grid with multi-voltage level and alternating current (AC)/DC hybrid feature. Based on the typical topological structure and engineering reliability theory, a reliability evaluation model for PET considering the device redundancy is established. After that, the reliability evaluation method of the AC/DC hybrid distribution network with a cascaded multiport PET is proposed. Finally, case studies are provided in a ‘hand in hand’ AC/DC hybrid power distribution network structure. Case 1 analyses the PET reliability level under different design patterns and the redundancy level. Case 2 gives the reliability evaluation results of the AC/DC hybrid distribution network with PETs, which proves the correctness and validity of the proposed algorithm. Case 3 compares the reliability level of the AC and DC system under different scenarios and proposes the reliability promotion advice for the DC power distribution network.

Inspec keywords: power transformers; power distribution reliability; reliability; hybrid power systems; load flow control; distribution networks; power distribution control; distributed power generation; power grids; power electronics

Other keywords: high-power supply capacity; future distribution grid; strong power flow control ability; engineering reliability theory; PET reliability level; typical topological structure; future distribution network; distribution process; direct current distribution network; power transmission; reliability evaluation results; DC power distribution network; cascaded multiport PET; reliability evaluation method; multiport power electronic transformer; reliability evaluation model

Subjects: Power convertors and power supplies to apparatus; Distributed power generation; Reliability; Control of electric power systems; Distribution networks; Transformers and reactors; Optimisation techniques; Power system control

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