Abstract
This paper focuses on the problem of load frequency control and sensor fault‐tolerant control in the multiarea power grid. To solve these problems, a sliding mode control strategy based on an interval observer is designed. First, an interval observer is designed to obtain the boundary estimation information of the system state online, which is used to reconstruct the load disturbance online. Based on the reconstructed values, an integral sliding mode controller is designed to keep the system frequency stable when the load is disturbed. Then, sensor fault is diagnosed by interval residual. An augmented observer is designed to estimate sensor fault online by equivalent transformation, and the sensor fault is compensated by the fault estimation to reduce the influence of fault on system performance and ensure the reliable and stable operation of the power system. The simulation results show the superiority of the proposed control strategy.
Highlights
Based on the above research, we propose an interval disturbance reconstruction technique to rapidly and accurately decouple and reconstruct the load disturbances in each region, so that the sliding mode load frequency control strategy based on interval disturbance reconstruction can effectively and quickly respond to the load changes and keep the system frequency deviation within a small range
Considering load fluctuation reconstruction, parameter uncertainty, sensor fault diagnosis, fault estimation, and fault transition, this paper proposes a fault-tolerant load frequency control strategy based on interval disturbance reconstruction. e main contributions are summarized as follows: (1) Interval observers are designed in each area of the LFC model of the multiarea interconnected power system, and the boundary value of system state quantity in each area is estimated rapidly and stably by using the designed observer
A new LFC scheme based on load disturbance reconstruction is proposed for the multiarea power grid, and the corresponding FTC strategy is developed in this paper
Summary
Erefore, it is important to design an effective LFC strategy with fault diagnosis and FTC scheme to reliably control the frequency of power system within an acceptable range. In order to solve the problem of sensor fault in nonlinear systems with uncertain parameters, a fault estimation technique based on an adaptive sliding mode observer was investigated in [37]. Considering load fluctuation reconstruction, parameter uncertainty, sensor fault diagnosis, fault estimation, and fault transition, this paper proposes a fault-tolerant load frequency control strategy based on interval disturbance reconstruction. E sliding mode fault-tolerant load frequency control strategy is proposed to maintain the reliability and stability of the system under the problems of load disturbance and sensor fault.
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