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access icon openaccess Frequency-domain-based complete loss model for 10 kV/1 MW solid-state transformer

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 15/10/2018, Accepted 25/10/2018, Revised 24/10/2018, Published 29/10/2018

This study proposes a frequency-domain-based loss model for dual active bridge (DAB) inside modular multi-level cascaded solid-state transformer (SST). Previously, the loss model is mainly derived in the time domain and requires enormous modelling effort. This study establishes the frequency-domain model of DAB. Based upon that, the switching loss, conduction loss and ferrite loss are derived. The loss model is then used to determine the control scheme for SST. The effect of a PR controller and notch filter on DAB is compared, and the detailed loss analysis is also presented. For the DAB control with a notch filter, it obtains higher efficiency and is implemented in the SST system. The experiment results in both DAB and SST systems verify the effectiveness of the proposed methods.

Inspec keywords: power system control; losses; frequency-domain analysis; notch filters; power transformers

Other keywords: modular multi-level cascaded solid-state transformer; SST system; PR controller; conduction loss; DAB control; notch filter; switching loss; ferrite loss; frequency-domain-based complete loss model

Subjects: Mathematical analysis; Control of electric power systems; Transformers and reactors; Power system control; Control system analysis and synthesis methods; Filters and other networks; Mathematical analysis

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