| PWM rectification system of permanent magnet synchronous generator(PMSG)has the advantages of low harmonic current,adjustable power factor,rapid dynamic response of DC voltage,and bidirectional flow of energy.It is widely used in ship power supply,special vehicle power supply,hybrid vehicle,new energy power generation and other fields.This paper takes the variable-speed PWM rectification system of PMSG as research object,adopts the combination of theoretical analysis,software simulation and experimental verification as the research route to study the control strategy of the PWM rectification system of PMSG.The specific contents are as follows:Firstly,this paper expounds the working principle of PMSG,establishes the mathematical model of rectification system under rotating coordinate system,and studies the operating constraint condition of PMSG,which laid the foundation for the study of control strategies.Secondly,the vector control theory of PMSG are introduced.On this basis,the paper studied dual-loop flux-weakening control with steady voltage,and pointed out traditional method existing cross coupling of dq axes.In order to solve the problem,flux-weakening control based on voltage angle is proposed,and the stable operating range of the system is given.Thirdly,MATLAB is used to analyze PWM rectification system of PMSG,which verified that the dual-loop flux-weakening control system and flux-weakening control system based on voltage angle are stable in the wide power range and wide speed range.And the effect of two control method is compared.Meanwhile,this paper compared the effects of dual-loop flux-weakening control under three modes: decoupling,feedforward decoupling and PI decoupling.Finally,the hardware and software design of generator controller based on TMS320F28335 digital control chip are completed,and the platform for back-to-back test is built.The experimental results verified the effectiveness of the proposed control strategy. |
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