Method of Suppressing Overvoltage on Rectification Side of Permanent Magnet Direct Drive Wind Power Converter
Permanent magnet direct drive wind power converters play an important role in wind generation systems,but the issue of overvoltage on the rectification side has always been a key factor affecting their safe and stable operation.This work studied a method to suppress overvoltage on the rectification side of permanent magnet direct drive wind power con-verters.First the mechanism of overvoltage on the rectification side was analyzed,including the impact of factors such as grid voltage fluctuations and wind power changes on the rectification side voltage.Then an overvoltage suppression strate-gy based on load energy release circuit and energy storage unit was designed,which automatically activated load relief cir-cuit when an excessive DC bus voltage was detected to consume excess energy and suppress the DC side overvoltage.In ad-dition,by designing dedicated energy storage units on the DC bus,surplus energy was transferred to the energy storage system for storage.After fault recovery or as needed,the stored energy was fed into the power grid.Moreover,this paper also explores how to interface the energy storage unit to the DC bus of the inverter through power electronic bidirectional conversion equipment,in order to achieve efficient energy utilization and stable voltage control.
permanent magnet direct drive wind power converterrectification sideovervoltage
万方数据
维普
