基于自适应控制的分数阶虚拟同步机控制技术OA

Addressing the issues that constant virtual inertia and damping coefficients in traditional virtual synchronous generator(VSG)control strategies impede system flexibility,slow down the response speed,and may cause dynamic oscillations and power overshoot phenomena under disturbances due to the introduced virtual inertia,an adaptive control-fractional-order-virtual synchronous generator(AC-FO-VSG)control method was proposed.Firstly,the influence of virtual inertia,damping coefficient,and fractional order on the system output characteristics was analyzed based on the VSG small-signal model and Bode diagrams of fractional-order virtual inertia.Subsequently,an adaptive fractional-order VSG control strategy was designed.This strategy replaces the virtual inertia link in the virtual synchronous generator with a fractional-order virtual inertia link,thereby reducing the system order.Concurrently,it employs an adaptive control function to dynamically adjust the system's inertia and damping coefficients,increasing the freedom to adjust parameters.These two aspects work together,ultimately achieving the effects of suppressing dynamic oscillations and power overshoots while enhancing the system response speed.Finally,simulations were performed to validate the proposed control strategy under active power command changes and frequency step disturbances.Simulation results validate the proposed control method's feasibility and superiority.