Adaptive Disturbance Rejection Control Harmonic Current Suppression Of Dual Three-phase Permanent Magnet Synchronous Generator Based On Harmonic Subspace Decoupling

Dual Three Phase Permanent Magnet Synchronous Generator(DTP-PMSG)has advantages over three-phase permanent magnet synchronous generators,such as low voltage and high power output,low torque ripple,and high fault tolerance.It is widely used in new energy fields such as all electric ships,multi electric aircraft,hybrid vehicles,and high-power wind power generation.However,the nonlinearity of the converter and the distortion of the air gap magnetic field of the motor body can cause a large amount of current harmonics in the stator winding of DTP-PMSG,leading to increased motor losses and seriously affecting the steady-state operation performance of the generator,thereby reducing the efficiency of the power generation system.Therefore,this article takes the phase shifted 30° DTP-PMSG rectifier system as the research object,and conducts in-depth research on the harmonic suppression strategy based on linear auto-disturbance rejection controller for the harmonic problem of DTP-PMSG stator winding current.Firstly,this article analyzes the harmonic magnetic electromotive force of three-phase winding and dual three-phase winding,and uses neutral point isolation connection method to eliminate 3k harmonics based on their advantages.Based on the Vector Space Decomposition(VSD)theory,the DTP-PMSG is modeled and the influence of the nonlinearity of the six phase voltage source rectifier on the current harmonics of the DTP-PMSG is derived.Build a traditional vector control model of DTP-PMSG rectifier system based on VSD transformation,add a rectifier dead zone to the model,and simulate and analyze the current harmonics in its stator phase current.Secondly,a harmonic suppression strategy that optimizes the traditional linear active disturbance rejection controller is proposed to address the problem of large harmonic currents in the harmonic subspace.Compared with traditional proportional integral controllers,linear active disturbance rejection controllers have good ability to suppress current harmonic disturbances.However,frequency characteristic analysis indicates that the controller has certain limitations,namely,its limited observation ability for AC disturbances in the frequency range of the bandwidth,making it impossible to suppress them without static errors.Therefore,this article proposes an adaptive disturbance rejection harmonic suppression strategy based on single loop synchronous rotation,which optimizes the control of linear adaptive disturbance rejection controllers and verifies the improvement of the proposed strategy’s harmonic suppression ability through simulation analysis.Then,in order to eliminate the dominant 5th and 7th harmonic currents in the harmonic subspace as much as possible,an adaptive disturbance rejection harmonic suppression strategy based on dual loop synchronous rotation is proposed.This strategy can decompose the 5th and 7th harmonic coupling in the harmonic subspace into direct flow and 12 times frequency AC flow through the theory of synchronous rotation coordinate transformation,and then use a linear autodisturbance rejection controller to track and control its direct flow form without static error,And the suppression effect of this strategy on 5th and 7th harmonic currents was verified through simulation analysis.Finally,an experimental platform for the DTP-PMSG rectifier system was established,and a brief analysis of the hardware and system software algorithm design was conducted.Based on this platform,experimental comparison and verification were conducted on the two proposed harmonic suppression strategies,and the experimental results verified the feasibility and effectiveness of the two proposed strategies.