Abstract
The goal of this study is to develop a disturbance observer-based prescribed performance fault-tolerant controller (PPFTC) for a multi-area interconnected power system (MIPS) with a hybrid energy storage system (HESS). The mathematical model of the MIPS with HESS is introduced first. Then the load disturbance estimation is obtained using a disturbance observer (DO) approach. By introducing two additional functions, the tracking error is bounded to achieve the desired response. The PPFTC is further developed based on the DO ensuring that the area control error (ACE) of the MIPS asymptotically converges to zero. Finally, the effectiveness of the given PPFTC and DO are inspected through the use of the Lyapunov theory and simulated results.
Highlights
The requirement for ideal power quality has raised considerable concerns about multi-area power systems, where each interconnected power subsystem shares power with neighboring power subsystems through tie lines [1]
Motivated by the aforementioned research, a disturbance observer based prescribed performance fault-tolerant controller (PPFTC) scheme is designed for the multi-area interconnected power system (MIPS) with hybrid energy storage system (HESS)
The observer is designed for the dynamic equation of MIPS with HESS in order to obtain the estimation values about disturbances which can be described by the following form: di = −Ki si − di sgn − k Aii xi k1 sgn − Aii xi − ηi sigλ, (22)
Summary
The requirement for ideal power quality has raised considerable concerns about multi-area power systems, where each interconnected power subsystem shares power with neighboring power subsystems through tie lines [1]. The primary frequency modulation approach for MIPS maintains the system frequency at the rated value through LFC and makes the area control error (ACE) zero This is achieved by adjusting the generator sets under the condition of continuously adjustable active power, ensuring that the power generation and load power is matched for the whole system. Motivated by the aforementioned research, a disturbance observer based prescribed performance fault-tolerant controller (PPFTC) scheme is designed for the MIPS with HESS. To the best of the author’s knowledge, so far there have been few reports in published literature that combine prescribed performance control with FTC and apply it to load frequency control of the MIPS; Compared to a few existing methods, by designing the finite time disturbance observer, the performance of the observer is improved from asymptotic convergence to finite time convergence.
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