Research on Terminal Overvoltage Protection of Direct Drive Permanent Magnet Wind Turbine

With the rapid development of society and economy, energy crisis and environmental pollution become more and more obvious, wind power as a clean and renewable energy has been rapid development. Offshore wind power generation systems mainly use direct-drive permanent magnet wind power generation systems, which have a simple structure and high reliability, which have attracted the attention of the country and wind power companies. This paper proposes a new type of low-power RLC filter circuit for the PWM high-frequency pulse wave on the transmission cable between the converter and the generator, and designs the parameters of its resistance R, capacitance C and inductance L. A new type of low-power RLC filter circuit is proposed for the PWM high-frequency pulse wave on the transmission cable between the converter and the generator, and the parameters of its resistance R, capacitance C and inductance L are designed. Finally, based on the uniform transmission line Transmission theory, built on Matlab/simulink platform without filter circuit and RC, RLC, new RLC filter circuit simulation model. The simulation results show that the new R-L-C filter circuit effectively suppresses the generator terminal overvoltage caused by long cable reflection, and its power loss is also the lowest.