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access icon openaccess Semiconductor loss calculation of DC–DC modular multilevel converter for HVDC interconnections

  • Author(s): Shanshan Zhao 1, 2 ; Yu Chen 1, 2 ; Li Peng 1, 2
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  • Source: Volume 3, Issue 4, December 2018, p. 263 – 271
    DOI:  10.1049/hve.2018.5039 , Online ISSN 2397-7264
This is an open access article published by the IET and CEPRI under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 12/05/2018, Accepted 17/09/2018, Revised 22/07/2018, Published 18/09/2018

DC–DC modular multilevel converter (DC–DC MMC) is an attractive candidate for high-voltage DC (HVDC) interconnections since it can provide the required voltage matching, galvanic isolation and flexible power control abilities. The semiconductor loss of such a DC–DC MMC is a major concern for both system evaluation and parameter design. However, it cannot be measured directly since it is out of the precision range of the high-voltage measuring equipment, and thus, mathematical analysis is considered as a feasible alternative. This paper proposes an accurate off-line loss calculation method for DC–DC MMC modulated by fundamental frequency modulation. Based on the characteristics of the modulation, the switching moments along with the instantaneous voltage and current can be calculated exactly, and the conduction loss and switching loss of each submodule can be expressed in a mathematical way. The calculation results are compared with the simulation results from a comprehensive switched model and show good accuracy performance within a relative error of  ± 2% under different operating conditions.

Inspec keywords: DC-DC power convertors; mathematical analysis; HVDC power transmission; power control; voltage measurement; power transmission control; switching convertors; HVDC power convertors; frequency modulation

Other keywords: high-voltage measuring equipment; flexible power control; conduction loss; mathematical analysis; offline loss calculation method; semiconductor loss calculation; switching loss; instantaneous current calculation; HVDC interconnections; fundamental frequency modulation; system evaluation; galvanic isolation; parameter design; DC–DC MMC; high-voltage DC interconnections; voltage matching; instantaneous voltage calculation; DC-DC modular multilevel converter

Subjects: Control of electric power systems; Voltage measurement; d.c. transmission; Mathematical analysis; Power system control; Power and energy control; Mathematical analysis; DC-DC power convertors

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