Abstract:Addressing the issue of frequency instability in power systems caused by the fluctuating output of renewable energy sources，the finite-time sliding mode load frequency control （LFC） strategy based on adaptive disturbance compensation is proposed，aiming to achieve rapid and finite-time stability of the system frequency in the presence of unknown disturbances. Firstly，to tackle the challenge of unknown disturbance upper bounds arising from the uncertainty in renewable energy output and load fluctuations，this paper introduces an adaptive sliding mode disturbance observer. This observer，operating without the need for disturbance upper bound information， facilitates the estimation of disturbances and enables direct implementation of disturbance compensation in the input channel. Then，the adaptive sliding mode disturbance observer is integrated with non-singular terminal sliding mode control （TSMC）， leveraging the finite-time convergence characteristics of terminal sliding mode to achieve rapid frequency stabilization. Simulation analysis reveals that the proposed control strategy demonstrates its ability to swiftly maintain frequency stability when confronted with fluctuations in wind-solar output and system load disturbances，thereby enhancing the frequency regulation performance of the system.