一种新的三相AC／DC PWM整流器控制策略

Novel control strategy for three-phase AC/DC PWM rectifier

中文关键词  脉宽调制(PWM)  BS神经网络  整功率因数  控制策略  数字信号处理(DSP)技术

英文关键词  pulse width modulation(PWM)  BS neural network  unity power factor  control strategy  digital signal processing(DSP) technique

中文摘要

      为了实现交流输入和整功率因数,提出了一种基于自适应B样条(BS)神经网络的三相PWM整流器控制策略;建立了在线训练BS神经网络的控制规律;提出了神经网络在线学习的新算法;运用空间矢量建模获得整流器的开关常数;使整个控制策略能够适合实时控制和自适应场合．利用DSP技术实现了整个控制策略．同时通过计算机仿真和现场实验证明了这个控制策略不仅具有稳定性好,而且具有响应快和整功率因数等优点．

英文摘要

      A novel direct adaptive control strategy using a B-spline neural network for the three-phase AC/DC(alternating current/direct current) voltage source pulse width modulation(PWM) rectifier is proposed, which realizes a sinusoidal AC input current and unity power factor. The control law is constructed based on the B-spline neural network directly, and the training of the network is on-line. An on-line learning algorithm is proposed for the neural network, and the space vector modulation method is then used to determine the switching instants of the rectifier, which makes the whole control strategy more suitable for real-time application and adaptive situations. The whole control strategy is also realized based on the digital signal processing (DSP) technique. Computer simulation and experimental results are both used to verify that the system with the proposed control strategy not only guarantees the good stability, but also provides good transient response and unity power factor.