Abstract
The implementation of the sliding mode control (SMC) for load frequency control of power networks becomes difficult due to the chattering phenomenon of high-frequency switching. This chattering problem in SMC is extremely dangerous for actuators used in power systems. In this paper, a continuous control strategy by combining a second-order mode and integral siding surface is proposed as a possible solution to this problem. The proposed second-order integral sliding mode control (SOISMC) law not only rejects chattering phenomenon in control input, but also guarantees the robustness of the multi-area power network, which has an effect on parametric uncertainties such as the load variations and the matched or mismatched parameter uncertainties. Moreover, the reporting of the simulation indicates that the proposed controller upholds the quality requirement by controlling with operating conditions in the larger range, rejects disturbance, reduces the transient response of frequency, eliminates the overshoot problem, and can better address load uncertainties compared to several previous control methods. The simulation results also show that the proposed SOISMC can be used for practical multi-area power network to lessen high parameter uncertainties and load disturbances.
Highlights
In general terms, a power network includes a connection of electrical components that can be divided into a generator that supply the power, the transmission system that inducts the power to the load from the centers of electricity generation, and the distribution system that supply the power to neighboring industries, hospitals, homes and the other kinds of load [1,2]
We introduce and prove that power networks with an integral sliding surface (ISS) work to be asymptotically stable and smooth in the sliding mode under assured conditions
In the simulation 3, we study the load frequency control (LFC) problem of the power network with load changes and parameter uncertainties, with the help of the proposed second-order integral sliding mode control (SOISMC), the frequencies of all areas return to the normal value in about 4.5 s after load disturbances occur
Summary
A power network includes a connection of electrical components that can be divided into a generator that supply the power, the transmission system that inducts the power to the load from the centers of electricity generation, and the distribution system that supply the power to neighboring industries, hospitals, homes and the other kinds of load [1,2]. Most traditional PID controller methods with fixed gain were designed under normal operating conditions of power systems These proposed approaches were always used in tuning or selecting modes, such as the fundamental method of trial and error without analytical methods for determining and optimizing the parameters of interconnected multi-area power networks. Some limitations of these controller methods are too complicated and of high order and requirement for on-line parameters identification implies for power system Among these presented control approaches, the SMC is attractive and powerful due to its ability to quickly converge, is useful to implement in power systems and is robust to external disturbances, system parameter variations and insensitivity with model errors of system. A continuous SMC strategy based on a SOISMC approach is introduced and developed for LFC of an interconnected multi-area power network.
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