基于相电流重构的异步电机矢量控制系统的研究

发布时间：2018-02-21 23:55

本文关键词： 异步电机矢量控制相电流重构脉冲移位矢量插入 dSPACE　出处：《南京理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：基于单电阻采样的相电流重构方法能够有效地降低交流变频调速系统的成本与体积,适用于低成本应用场合。但是该方法存在不可观测区内相电流重构失败的问题。针对该问题,论文对基于单电阻采样的相电流重构方法进行了深入的研究。论文以矢量控制理论为基础,建立了按转子磁链定向的直接矢量控制系统,对连续电压空间矢量脉宽调制(CSVPWM)与不连续电压空间矢量脉宽调制(DSVPWM)的原理以及实现方式进行了分析,通过MATLAB/Simulink对该控制系统进行了仿真与分析。在CSVPWM与DSVPWM两种调制方式下对基于单电阻采样相电流重构方法的基本原理进行了分析。针对传统的脉冲移位相电流重构方法不能解决特定区域内相电流重构失败的问题,论文提出了一种基于有效矢量插入的相电流重构方法,通过对有效矢量插入相的PWM波进行占空比补偿,使有效矢量插入前后的合成电压矢量保持不变,实现了整个矢量空间内的相电流重构。并通过仿真验证了所提方法的可行性。最后,基于dSPACE半实物仿真平台,构建了基于有效矢量插入相电流重构的矢量控制实时仿真实验系统,该系统的设计内容主要包括硬件电路设计和离线仿真模型的实时改造。并利用ControlDesk软件对该控制系统进行在线调试,实验结果表明所提的相电流重构方法在CSVPWM与DSVPWM两种调制方式下均是有效的。
[Abstract]:The phase current reconstruction method based on single resistance sampling can effectively reduce the cost and volume of AC variable frequency speed regulating system. This method is suitable for low cost applications. However, this method has the problem of failure of phase current reconstruction in the unobservable region. Based on the theory of vector control, a direct vector control system based on rotor flux linkage is established. The principle and implementation of continuous voltage space vector pulse width modulation (CSVPWM) and discontinuous voltage space vector pulse width modulation (DSVPWM) are analyzed. The control system is simulated and analyzed by MATLAB/Simulink. The basic principle of phase current reconstruction method based on single resistor sampling is analyzed under two modulation modes of CSVPWM and DSVPWM. The traditional pulse shift phase current reconstruction method is analyzed. The method can not solve the failure of phase current reconstruction in a specific region. In this paper, a phase current reconstruction method based on effective vector insertion is proposed. By compensating the duty cycle of the PWM wave of the effective vector insertion phase, the synthetic voltage vector before and after the effective vector insertion is kept unchanged. The phase current reconstruction in the whole vector space is realized, and the feasibility of the proposed method is verified by simulation. Finally, based on the dSPACE hardware-in-the-loop simulation platform, A real-time simulation system of vector control based on effective vector insertion phase current reconstruction is constructed. The design content of the system mainly includes hardware circuit design and real time transformation of off-line simulation model. The control system is debugged online by ControlDesk software. The experimental results show that the proposed phase current reconstruction method is effective in both CSVPWM and DSVPWM modulation modes.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM343;TP273

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