Sliding Mode Load Frequency Control for Interconnected Power Systems with Time-Varying Delayed Multi-Regions
The common use of open communication networks in interconnected power systems has turned the constant time delay of the original dedicated channel into the time-varying time delay.The time-varying time delay deteriorates the dynamic performance of load frequency control(LFC)and lead to system frequency instability.Therefore,the sliding mode LFC method for time-varying delayed multi-regions interconnected power systems is proposed and stability analysis is conducted based on the Lyapunov functionals.Firstly,the Caputo-type fractional-order Lyapunov functional is introduced into the stability analysis,and the conservativeness of the stability analysis is reduced by adjusting the upper limit of the function integral;then,the stability conditions of the time varying time delay power system described by the linear matrix inequality are obtained by combining Lyapunov theory and the integral inequality;finally,simulations are conducted to verify the impact of the proposed control strategy on the dynamic performance of the LFC and the robustness to load disturbances and wind power fluctuations.
fractional-order Lyapunov functionalinterconnected power systemload frequency controlstability analysistime-varying time delay
万方数据
维普
