Adaptive Control Strategy for Moment of Inertia and Damping Coefficient of Virtual Synchronous Generator

As the penetration of the distributed energy source in the grid is becoming higher and higher. However, power electronic converters in micro-grid seriously harm the stability of power system, due to the lack of necessary inertia and damping. To deal with the problem, Virtual synchronous machine (VSG) control is applied to simulate the inertia and damping of synchronous generator (SG), However, constant moment of inertia and damping coefficient cannot ensure the power and frequency regulation performance, and cannot make the system frequency and power response stability and rapid when the disturbance occurs. Therefore, the paper proposes a VSG rotational inertia and damping coefficient adaptive control strategy to improve the rapidity and stability of the power system. Firstly, the working principle of VSG is introduced, Secondly, Based on VSG control, a cooperative adaptive control strategy of inertia and damping coefficient is proposed, The stability analysis under the change of corresponding parameters is given; Finally, the simulation results of VSG under fixed and adaptive control are compared by MATLAB/Simulink simulation, Testify the effectiveness of the proposed control strategy.