Non-communication Dynamic Low-Frequency Wind Power System and Its Generator Types

As a novel wind power solution, non-communication dynamic low-frequency wind power system integrates two key technologies: flexible low-frequency transmission and centralized frequency conversion. It operates on the principle of follow-up control between active power and frequency, eliminating the need for high-speed communication between AC-AC converter stations and wind farm. This approach offers significant economic and reliability advantages when applied to medium and long-distance offshore wind power technology. The analysis assesses the suitability of squirrel cage induction generator, permanent magnet synchronous generators, and electro-excited synchronous generators for dynamic low-frequency technology. It has been discovered that the electromagnetic induction principle and asynchronous operation capability possessed by the squirrel cage induction generator are crucial for the stable operation of the system. When applying synchronous generators, the dynamic low-frequency wind power system is easy to experience unexpected power exchange between multiple generators, while adding a q-axis damping winding to the electro-excited synchronous generator can significantly reduce the unexpected power exchange.