VSG Inertia and Damping Coefficient Adaptive Control

Abstract

With the widespread application of distributed power generation, the stability of the power grid is severely affected. In order to simulate the characteristics of large inertia and large damping of traditional synchronous motors, virtual synchronous generator control technology was born. However, fixed parameters cannot take into account the steady state and dynamic characteristics of the system. Aiming at this deficiency, this paper proposes an adaptive control strategy for moment of inertia and damping coefficient. First, the mathematical model of the virtual synchronous generator is established, and the control block diagram of the VSG closed-loop system is established. The influence of the moment of inertia and the damping coefficient on the steady state performance and dynamic performance of the system is analyzed. This paper proposes a control strategy that dynamically adjusts the virtual moment of inertia and damping coefficient. This control strategy can ensure the stability of the system and quickly recover when the angular velocity deviation is too large, and reduce the deviation. Finally, in Matlab/Simulink built a simulation model to verify the effectiveness and superiority of the proposed control strategy over fixed parameter control parameters.