Research Of Drive Control Technology For Squirrel-cage Induction Wind Generator

With the growing importance of new energy, the technology of wind powergeneration has been extensively studied. At the same time, Cage induction windturbine, whose structure is simple, maintenance, long life and other advantages, hasbeen obtained more and more attention.This paper discusses the drive control technology for squirrel-cage inductionwind generator with speed sensor and without speed sensor. Indirect field orientedand direct field oriented drive control technology are introduced respectively. Aflux-weakening control method based on stator voltage close loop is discussed, toensure the generator operate well when above the rated speed. Speed sensor maylost when the generator operate long time, it is necessary to research the sensorlessdrive control technology. After analysis and compare the existing types of controltechnology, select the control technology based on sliding mode observer for speedsensorless drive, which construct the sliding surface with stator current observationerror. Using Popover super stability theory, derive the adaptive law of rotor speedand rotor resistance.In addition, the grid-side converter control principle is also discussed. In orderto verify the correctness of the proposed control technology, simulation andexperiment are implemented, whose results show that the cage induction windgenerator control system designed has a good performance.