Journal
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
Volume 138, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijepes.2022.107971
Keywords
Load frequency control (LFC); Event-triggered integral sliding mode control (ETISMC); Zeno event; Disturbance observer (DO)
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This paper presents a disturbance observer-based event-triggered integral sliding mode control scheme for load frequency control in the presence of time varying uncertainties and disturbances. The disturbance observer is designed to estimate the load disturbance, and integral sliding surfaces are proposed to eliminate the chattering effect. The stability and effectiveness of the proposed control scheme are proved through numerical simulations.
In this paper, a disturbance observer (DO)-based event-triggered integral sliding mode control (DOETISMC) scheme for load frequency control (LFC) is presented in the presence of time varying uncertainties and disturbances. Firstly, the disturbance observer is designed to provide an online estimation of the unmatched load disturbance from the measurable variables. This estimation is being used as a feed-forward to the controller to attenuate the disturbance effect. Secondly, two types of integral sliding surfaces are proposed based on the estimated disturbances to eliminate the chattering effect of the integral sliding mode control (ISMC). Due to Lyapunov theory and utilization a decreasing triggering threshold, the ultimate boundedness stability of the system under the proposed controller is proved. Moreover, it is ensured that during the system process, the Zeno event as a basic obstacle in the ETISMC does not occur. The validity and advantages of the proposed method in oscillation suppression are well revealed through numerical simulations in different cases of single-area and multi-area power systems with time varying uncertainties and disturbances.
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