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Centralized sliding mode frequency regulation approach for an uncertain islanded micro grid integrated with disturbance observer
Author(s) -
Deepika Deepika,
Kaur Sandeep,
Narayan Shiv
Publication year - 2019
Publication title -
asian journal of control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.769
H-Index - 53
eISSN - 1934-6093
pISSN - 1561-8625
DOI - 10.1002/asjc.1993
Subject(s) - control theory (sociology) , settling time , robustness (evolution) , sliding mode control , computer science , integral sliding mode , grid , frequency domain , robust control , overshoot (microwave communication) , control engineering , engineering , control system , control (management) , mathematics , step response , artificial intelligence , geometry , quantum mechanics , physics , nonlinear system , chemistry , telecommunications , biochemistry , computer vision , electrical engineering , gene
This paper proposes a novel secondary frequency regulation technique for an uncertain islanded micro grid (MG). The major motivation of the work is to integrate the intrinsic robustness of the sliding mode control scheme with the disturbance observer to estimate and alleviate the unknown mismatched uncertainties caused by renewable resources and load variations. To this end, a dynamical sliding manifold is first utilized and then a control law is derived with Lyapunov's method which stabilizes the MG dynamics. Moreover, in order to ensure faster time domain responses of the closed‐loop system, we employ a power rate reaching law in our proposed control design. Thereafter, the performances of the introduced control strategy are tested on an islanded MG using MATLAB/Simulink, and robustness analysis is also carried out by considering five different case studies. Further, in contrast to the existing approaches such as robust H ∞ and robust PID control, the proposed strategy renders appealing time domain characteristics such as settling time, peak overshoot, and integral absolute frequency error.