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access icon free Robust optimisation framework for SCED problem in mixed AC-HVDC power systems with wind uncertainty

© The Institution of Engineering and Technology
Received 02/10/2019, Accepted 10/06/2020, Revised 09/04/2020, Published 15/06/2020

Wind power uncertainties have made the large integration of wind power generating units in the power system highly challenging. One promising solution to overcome the challenges associated with the intermittency of the renewable energy resources (RESs) is to connect areas with diverse renewable energy portfolios via high voltage direct current (HVDC) transmission lines with controllable power transfer capability. The installation of HVDC transmission lines in the power system has resulted in the evolution of conventional alternating current (AC) networks to mixed AC-HVDC power systems. In this study, to address wind power uncertainties in mixed AC-HVDC multi-area power systems, a modified robust optimisation (RO) model for the security-constrained economic dispatch (SCED) problem is proposed. The proposed RO model is used to minimise the generation cost and wind power curtailment under the worst-case scenario of actual wind power. Unlike the existing RO models, the proposed RO model considers a modified uncertainty set based on the wind power admissibility and addresses the budget of uncertainty more accurately to adjust the solution's level of conservatism. Extensive numerical studies demonstrate the economic and operational advantages of the proposed RO model for solving the SCED problem in mixed AC-HVDC power systems with high penetration of RESs.

Inspec keywords: optimisation; power grids; renewable energy sources; power system security; wind power plants; HVDC power transmission; power generation economics; power generation dispatch; power generation scheduling; HVDC power convertors; power transmission economics

Other keywords: wind power uncertainties; renewable energy resources; HVDC transmission lines; high voltage direct current transmission lines; modified uncertainty set; uncertain wind power generation; mixed AC-HVDC multiarea power systems; actual wind power; controllable power transfer capability; RO model; conventional alternating current networks; modified robust optimisation model; wind power admissibility; security-constrained economic dispatch problem; mixed AC-HVDC power systems

Subjects: d.c. transmission; Power system protection; Optimisation techniques; Power system management, operation and economics; Wind power plants

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