Jointed Observer-Based Sliding Mode Predictive Control for Interconnected Power Systems With Input Delays

This paper is concerned with the sliding mode predictive control problem for the load frequency control (LFC) of interconnected power systems with input delays and load disturbance. To deal with input delays, unknown disturbance, the interconnected influence existing simultaneously in power systems, the state-observer and disturbance-observer are respectively designed by employing the reduction transformation technique for state observer and introducing the sliding mode surface for the extended disturbance observer. Then the jointed observers based integral sliding mode controller with active disturbance compensation is designed. Furthermore, by constructing a novel Lyapunov function and matrix inequality technique, the sufficient conditions of exponential stability are provided for the closed-loop observer error systems in linear matrix inequality form, which can be solved by linear matrix inequality (LMI) toolbox in Matlab. Simulation is given to verify the effectiveness of the proposed approach. Note to Practitioners—This paper was motivated by the practical control problem of load frequency control systems with input delay. The input delay, unknown load disturbance and frequency fluctuation of tie-lines make it difficult to design a suitable control for load frequency control systems. The main practical contributions are summed as follows: A new jointed observer-based sliding mode predictive control approach is proposed to the interconnected power systems with input delays. By employing the reduction transformation technique, a jointed observer based integral sliding predictive mode controller with active disturbance compensation is developed to deal with input delay, unknown disturbance, the interconnected influence existing simultaneously in practical power systems.