Robust Load Frequency Sliding Mode Control Based on Uncertainty and Disturbance Estimator
Load frequency (LF) is one of the important problem in electric power system design and operation. Electric power systems consist of a number of control areas, which generate power to meet the power demand. However, poor balancing between generated power and demand can cause the system frequency to deviate away from the nominal value and creates inadvertent power exchanges between control areas. To avoid such situations, LF controllers are designed and implemented to automatically balance generated power and demand in each control area [1, 2].
The classical integral controller is successful in achieving zero steady-state frequency deviation but exhibits poor dynamic performance. In power systems, one of the most important issue is the load frequency control (LFC), which deals with the problem of how to deliver the demanded power of the desired frequency with minimum transient oscillations . Whenever any suddenly small load perturbations resulted from the demands of customers in any areas of the power system, changes of high-line power exchanges and the frequency deviations will occur. Thus, to improve the stability and performance of the power system, it is necessary that generator frequency be setup under different loading conditions. For this reason, many control approaches have been developed for the load frequency control. Among them, PID controllers , optimal controllers , nonlinear  and robust control , and neural and/or fuzzy strategies [8-10] approaches has been developed.
KeywordsPower System Slide Mode Control Slide Mode Controller Load Frequency Single Input Single Output
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