The Research on Grid-connected Wind-power Generation System of Variable Speed Permanent Magnet Synchronous Wind Generator

摘要

This paper focuses on studying the operating control of direct-drive grid-connected wind-power generation system of variable speed PMSWG.After wind turbine simulation is analyzed first,the closed-loop current control method of DC motor based on BUCK speed regulating circuit is put forward.Non-controllable rectifier and grid-connected PWM inverter is adopted as the AC grid-connected circuit of PMSWG.Using DC voltage as grid-connected parameter,the method which observes speed from DC voltage without speed sensor is proposed.The novel maximal wind-energy tracing strategy of direct control of grid-connected power is proposed.The non-controllable direct grid-connected method is adopted to form the complete control arithmetic,which is verified in emulation.Results show that this new arithmetic is more effective and has better steady-state precision and dynamic performance.