Decoupled Sequential Power Flow Study in MT-MVDC Distribution Systems based on Novel NR/Estimation-Correction Algorithm

Pingyang Sun, Rongcheng Wu, Gen Li, Muhammad Khalid, Graham Town, Georgios Konstantinou

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Abstract

In order to address the gap in comprehensive power flow (PF) analysis of multi-terminal medium-voltage direct current (MT-MVDC) distribution systems, this paper proposes a novel decoupled sequential PF algorithm based on Newton-Raphson (NR)/estimation-correction method. The presented algorithm is designed for an MT-MVDC distribution network and takes into account the PF equations of both generic ac/dc and dc/dc converters. The MVDC PF study is the main focus and the power losses of voltage source converters (VSCs) & dc/dc converters are considered for accurately deriving the dc powers at MVDC links. The proposed algorithm only requires to define a single dc power or current bus type, hence the bus type definition is simplified and the solution of multiple sub-Jacobian matrices can be avoided. A binary search method is employed to correct the estimated initial dc power/current values, which contributes to the searching time reduction. Although an external correction iteration is required in the dc PF derivation, the proposed algorithm still improves on the computation efficiency in comparison with coupled sequential ac/dc PF algorithms. An MT-MVDC distribution network incorporated into IEEE 14 bus system verifies the validity and efficiency of the proposed algorithm.
Original languageEnglish
Title of host publicationProceedings of 11th IEEE International Conference on Power Electronics-ECCE Asia
Number of pages6
PublisherIEEE
Publication date2023
Pages1464-1469
ISBN (Electronic)978-89-5708-350-5
DOIs
Publication statusPublished - 2023
Event2023 11th International Conference on Power Electronics and ECCE Asia - Jeju Island, Korea, Republic of
Duration: 22 May 202325 May 2023

Conference

Conference2023 11th International Conference on Power Electronics and ECCE Asia
Country/TerritoryKorea, Republic of
CityJeju Island
Period22/05/202325/05/2023
SeriesProceedings of the Energy Conversion Congress and Exposition - Asia, Ecce Asia 2021
ISSN2150-6078

Keywords

  • Multi-terminal medium-voltage direct current (MT-MVDC) system
  • Voltage source converter (VSC)
  • Dc/dc converters power flow (PF)

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