Research On The Complex Control Of Permanent Magnet Direct-drive Wind Power Generation System Based On Three Phase Current Source Inverter

Currently, topologies of power converters applied to permanent magnet direct drivewind power generation systems are almost all voltage source converters. Current sourceconverters as the dual structure of voltage source converters do offer some specificadvantages, but research and application at home and abroad are rare. One of the reasons isthat the LC filter of the AC side can cause LC resonance. To solve the problem, in thispaper the complex control of permanent magnet direct-drive wind power generation systembased on three phase current source converter has been researched. The main work andinnovation is:Firstly, according to the analysis of the model on the CSI, the dynamic mathematicalmodel has been established, and then deduced the small signal model, thus laid thetheoretical foundation for system analysis and controller design. Based on the modelsabove, this paper proposes a proportional resonant differential (PRD) control method,which the design of the controller is greatly simplified and is capable of achieving highquality dynamic and steady-state performances.Secondly, the complex control of permanent magnet direct-drive wind powergeneration system based on three phase current source back to back converter for thecontrol method above has been established. In this paper, field-oriented control (FOC) isdeveloped at the generator side. Speed sensorless control of permanent magnet synchronousgenerator not only reduces system cost and maintenance rates, and enhanced anti-jammingperformance. While voltage-oriented control (VOC) is employed for the grid side to controlthe dc link current and reactive current to regulate the bus voltage or meet other gridoperating requirements.At last, the proposed system and control strategy are simulated in Matlab/Simulink fora permanent magnet direct-drive wind power generation system based on three phasecurrent source back to back converter. And a prototype system using Insulated Gate BipolarTranslator (IGBT) is constructed for experimental verification. Simulation andexperimental results show the correctness of the theoretical analysis and the proposedcontrol strategy and control algorithm.