Application Of SVPWM Modulation Algorithm Based On Harmonic Suppression In Permanent Magnet Synchronous Motor

Permanent Magnet Synchronous Motor(PMSM)is the main component of CNC machine,robotics and so on,which has small size,high power and efficiency.With the development and progress of rare earth permanent magnet materials,PMSM design and manufacturing technology,power electronics and micro-processor technology,PMSM has been widely studied and applied.At present,PMSM has to face the challenge of controlling.In order to solve the harmonic problem in the control of PMSM,several controlling algorithms are proposed in this thesis.The main contributions are summarized as follows:Firstly,the mathematical model of PMSM in A-B-C three-phase stationary and d-q rotating coordinate system is deduced.The basis theory of Park and Clark transformation are analyzed.Also,the fundamentals of space vector control and its classical methods are introduced.Secondly,in order to solve the problem of harmonic current,a new space vector pulse width modulation(SVPWM)over-modulation control strategy is proposed.In this strategy,the control mode is 0di(28)and the parallel harmonic current blocking module is increased in the traditional speed-current double closed-loop system.Simulation results show that the proposed control strategy can effectively suppress the5 th and 7th harmonics and improve output fundamental voltage.Thirdly,a space vector power feed-forward control strategy is proposed to suppress the DC bus voltage fluctuation.The proposed strategy is based on space vector and it uses the power feed-forward control module to suppress the DC bus voltage fluctuation.Compared with traditional methods in simulation,the proposed strategy can greatly improve the control performance.Finally,In order to suppress the dead-time effect,an on-line compensation algorithm is introduced and its mathematic model is established.In addition,the dead-time voltage and current effects of the inverter are analyzed in detail.Also the algorithm is verified on the experiment platform,where the core control chip is TI's TMS320F2810 DSP.The simulation results verify the algorithm can effectively suppress the harmonics and improve the stability of system.