Non-linear adaptive coordinated controller design for multimachine power systems to improve transient stability

Tushar Kanti Roy; Md Apel Mahmud; Weixiang Shen; Amanullah M.T. Oo

Non-linear adaptive coordinated controller design for multimachine power systems to improve transient stability

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Author(s): Tushar Kanti Roy ¹ ; Md Apel Mahmud ¹ ; Weixiang Shen ² ; Amanullah M.T. Oo ¹
- Affiliations: 1: School of Engineering, Deakin University, Geelong, VIC 3216, Australia ;
  2: School of Software and Electrical Engineering, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
Source: Volume 10, Issue 13, 06 October 2016, p. 3353 – 3363
DOI: 10.1049/iet-gtd.2016.0377 , Print ISSN 1751-8687, Online ISSN 1751-8695

Received 25/03/2016, Accepted 03/06/2016, Revised 20/05/2016, Published 06/10/2016

Based on an adaptive backstepping approach, this study proposes a new coordinated control design where the coordination is done between the excitation controller of synchronous generators and steam-valve controller of turbine-governor systems in a multimachine power system by considering the critical parameters of both systems as unknown. This new coordinated control scheme can ensure the stability of multimachine power systems through the formulation of control Lyapunov functions (CLFs) and derive the adaptation laws to estimate the unknown parameters in the design process to prove the convergence of power systems using CLFs. The performances of the proposed control scheme are evaluated on a two-area four-machine 11-bus power system under different operating conditions such as three-phase short-circuit faults along with changes in loads. Simulation results are then compared with those of a similar controller where there is no coordination between the excitation and steam-valve controllers as well as with a coordinated sliding-mode controller. The results clearly show the effectiveness and superiority of the proposed control scheme.

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