Research On Complex Vector Decoupling And Time Compensation Of HSPMSM

For high speed applications,high speed direct drive permanent magnetic synchronous motor(PMSM)has the advantages in terms of small size,high power density,omission of mechanical speed change devices,high efficiency,and fast dynamic response,etc.Therefore,the research on PSMSM has been high lighted.Consequently research on the theory and control performance of PMSM at high speeds has important theoretical significance.Firstly,the mathematical models of PMSM in different coordinate systems were introduced.The mathematical models were established in abc three-phase stationary coordinate system,αβ two-phase stationary coordinate system and dq two-phase rotating coordinate system.After the coordinate transformation,the PMSM was controlled based on field-oriented control(FOC).At the same time,space vector pulsewidth modulation(SVPWM)was adopted in the inverter of PMSM.Secondly,the problem of low carrier ratio control of PMSM under high-speed operation was analyzed.An optimized complex vector control method used in low carrier ratio was introduced.This control method can solve the current coupling problem of PMSM at high-speed better than traditional control method.At the same time,delay compensation was carried out for the system delay problem caused by the limit of low switch frequency of inverter.This method improved the current dynamic response capability and stability under low carrier ratio.Simulation and verification of low carrier ratio optimized complex vector control of PMSM was carried out using Matlab/Simulink software.The dSPACE real-time simulation system was used as as the core controller to build the PMSM control experiment platform,complex vector adjustable current regulator with decoupling and delay compensation functions was designed.Finally the improved and optimized FOC of PMSM was realized.When the motor was running in the state of low carrier ratio,the dynamic performance response of the current loop was verified by comparative experiments at high and low speeds.Finally,the work was summarized,the problems and deficiencies were analyzed,the future development trends and research directions were forecasted.