Consensus Based Damping Cooperative Control for Multi-Converter System

Most distributed power sources in microgrids lack the necessary inertia, resulting in poor system frequency stability. Therefore, virtual synchronous machines (VSG) are used to simulate the characteristics of synchronous motors to provide inertia support, but at the same time, problems such as active power oscillation are introduced, especially when multiple VSGs are operated in parallel. This problem is more serious. This paper proposes a mutual damping control strategy based on a distributed communication architecture. Through the mutual damping control between adjacent VSGs, the VSGs in the system tend to the same output frequency at all times under disturbance, which improves the dynamic characteristics of VSGs and effectively suppresses power oscillations. In addition, this paper proves the stability of the improved system by constructing a small signal model to draw the system pole distribution, and verifies the effectiveness of the proposed control strategy through Matlab/Simulink simulation.