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access icon free Optimal power flow in distribution network considering spatial electro-thermal coupling effect

  • Author(s): Jun Shu 1 ; Rui Guan 1 ; Lei Wu 2
    • View affiliations
    • Affiliations: 1: School of Electrical & Electronic Engineering, North China Electric Power University, Changping District, Beijing 102206, People's Republic of China ;
      2: ECE Department, Clarkson University, Potsdam, NY 13699, USA
  • Source: Volume 11, Issue 5, 30 March 2017, p. 1162 – 1169
    DOI:  10.1049/iet-gtd.2016.0909 , Print ISSN 1751-8687, Online ISSN 1751-8695
© The Institution of Engineering and Technology
Received 13/06/2016, Accepted 24/11/2016, Revised 26/09/2016, Published 30/03/2017

The conductor resistance changes in accordance with the conductor temperature, in turn the line thermal capacity limit and power flow are influenced by its spatial characteristics of line routes and surrounding weather conditions. In light of the significant difference of spatial characteristics of line routes and weather conditions in different regions covered by distribution network, a novel optimal power flow (OPF) model in distribution network considering spatial electro-thermal coupling effect is proposed to integrate heat transfer constraints and electro-thermal coupling constraints into normal distribution network operation constraints. To address the computational complexity of the proposed model, the line thermal capacity limit is calculated firstly using the spatial steady-state heat balance equation. Then, a genetic algorithm combined with an extended back/forward sweep method is presented to solve the distribution system OPF problem, in which the heat balance equation is embedded in the forward sweep stage of the power flow calculation. Consequently, line temperatures, resistances, and power flows are dynamically updated during the iterative procedure. A 14-bus system with nine regions shows that the spatial electro-thermal coupling effect has a significant impact on the result of power flow and the optimal dispatch of the distributed generation in the distribution network.

Inspec keywords: thermal analysis; iterative methods; power distribution lines; computational complexity; distributed power generation; power generation dispatch; load flow; genetic algorithms

Other keywords: spatial electrothermal coupling effect; iterative procedure; spatial steady-state heat balance equation; power flow calculation; OPF model; distribution network operation constraints; line thermal capacity limit; computational complexity; optimal dispatch; electrothermal coupling constraints; distributed generation; conductor resistance; conductor temperature; distribution system OPF problem; line routes; spatial characteristics; back-forward sweep method; heat transfer constraints; genetic algorithm; optimal power flow

Subjects: Interpolation and function approximation (numerical analysis); Distribution networks; Optimisation techniques; Distributed power generation; Power system management, operation and economics

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