VSG-based PMSG Multi-machine Parallel with DC Droop Control Strategy

This paper presents a control strategy for multi-machine parallel permanent magnet synchronous generator (PMSG) grid-connected system, which combines the advantages of virtual synchronous generators (VSG) and direct current transmission to achieve large-scale wind power integration. The grid-connected inverter adopts the VSG control strategy to simulate the port characteristics of the traditional synchronous generator, which can actively provide the inertia support for the system when the power system fluctuates. Based on the power-DC voltage drooping characteristics, a machine-side DC droop control strategy is constructed. This control strategy can significantly reduce the number of inverters and realize the collection and transmission of DC-type power, thereby saving economic costs and reducing the cost. Many problems caused by the internal AC collection process of wind farms. Finally, the performance and effectiveness of the proposed method are validated by the simulation results.