面向现代微电网中电压源换流器集成的有限时间收敛自适应滑模控制

This research article presents an innovative approach to enhance the performance and robustness of voltage source converters within microgrid systems. Existing controls suffer from slow convergence and unsatisfactory transient performance when dealing with disturbances, especially in the presence of control delay. To discourse these limitations, the proposed sliding mode controller is augmented with a nonlinear disturbance observer to enhance the disturbance elimination capability, attenuates the effect of parameter uncertainties, superior voltage reference tracking and suppressing chattering in the control response. The observer is introduced to estimate sensor values, potentially eliminating the need for dedicated sensors. The proposed control strategy employs a switching Lyapunov function-based mathematical model, addressing dynamic response limitations and switching action incorporating nonlinearities in the proposed model. By incorporating Lyapunov-based stability analysis, the article overcomes limitations and conservatisms associated with traditional linearized techniques, enabling more accurate stability assessments. Online adaptation norms are integrated to estimate and reject external disturbances, aligning closed-loop responses with reference models. Extensive numerical simulations and hardware-in-the-loop experiments validate the improved performance, highlighting the elimination of chattering and enhanced robustness against step and stochastic disturbances.