Abstract
This paper proposes a high-gain disturbance observer (HDOB)-based controller for load frequency control (LFC) of power systems with multiple areas. The main goal of LFC problem is to maintain the frequency to its nominal value. The objective of this paper is to reject frequency variations due to abrupt load changes and diverse uncertainties (e.g., inertia and damping parameters, and interconnection topology, etc.) by employing the HDOB for the LFC. The simulation results demonstrate the effectiveness of the proposed HDOB-based LFC by showing that it successfully rejects frequency variations owing to load changes and frequency variations occurring in various locations in interconnected power systems. Besides, it is shown that the proposed LFC can eliminate frequency deviations although there are delays in transmission among the power systems with multiple areas.
Highlights
Frequency is an important quality index in power systems since it indicates if the balance between the electrical load and the power supplied by generators is maintained
One shows that the proposed high-gain disturbance observer (HDOB)-based load frequency control (LFC) can eliminate the frequency deviation induced by load changes taking place at various locations in power systems under uncertainties in the inertia and damping parameters in the swing equation
This section covers about the performance of LFC in various power system topology
Summary
Frequency is an important quality index in power systems since it indicates if the balance between the electrical load and the power supplied by generators is maintained. Several papers propose an observer for dealing with uncertain load changing in power systems with multiple areas [6,7,8,9,10,11,12,13,14,15,16]. A high-gain disturbance observer (HDOB)-based robust LFC [17] is designed and applied to power systems with multiple areas in order to reject frequency deviations. One shows that the proposed HDOB-based LFC can eliminate the frequency deviation induced by load changes taking place at various locations in power systems under uncertainties in the inertia and damping parameters in the swing equation. The second simulation result demonstrates that the proposed LFC can get rid of the frequency deviation despite the measurement delay which can lead to harmful effect in existing approaches. Simulation results demonstrate that the HDOB-based LFC shows robustness against topologies in one area power system and between areas
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