脉宽调制型逆变器优化数字控制技术研究

Optimization of Digital Control Technology of Pulse Width Modulation Inverter

对脉宽调制型(pulse width modulation,PWM)逆变器在离散域下直接建立准确的逆变器离散化模型建模,得到准确的离散域数学对象模型后,再在离散域下直接进行控制器设计,从而得出最好的对象模型与优化的数字控制方案。在比例–积分(proportional-integral,PI)控制参数设计时,通过朱利判据得到PI参数的取值范围,并且根据内环截止频率比外环高的要求设计出最后的控制器参数。最后在1台逆变器台架上进行了试验,验证了理论与仿真以及控制参数设计的正确性。

This paper studied direct construction of correct inverter discretization model of pulse width modulation inverter in discrete domain. After getting correct discrete domain mathematical object model,design for controller in discrete domain was directly proceeded and the best object model and optimized mathematical control scheme was obtained. When designing proportional-integral control parameters,value range of PI parameters was acquired by means of Juli stability criterion. Ac-cording to requirement of inner-ring cut-off frequency being higher than outer-ring cut-off frequency,final controller pa-rameters were worked out. Experiment was carried out on one inverter rack and correctness of theory and simulation and de-sign for control parameters was verified.