基于DSP的三电平直接转矩控制

A Direct Torque Control System based on a DSP Controller

改进的电压磁链模型能够获得全速度范围内磁链的准确观测。针对三电平系统中存在的中点电压不平衡和需要减小dv/dt等问题,提出了一种电压矢量选择方案,通过引入中点电压滞环,综合考虑电磁转矩和定子磁链的要求,实现了异步电动机的变频调速运行。并采用TI公司的TMS320F240型DSP做为主控制芯片,在一台异步电动机上进行实验,验证了所提出算法的有效性。

An improved voltage model flux estimator is used to calculate stator flux accurately in full speed range. In the three-level inverter system,there are some problems,such as neutral voltage unbalance and high voltage break. Therefore,a vector selection scheme is put forward,which introduces a neutral voltage comparable loop as well as considering the change of both motor torque and stator flux.Experiments are made with the control core of TMS320F240. The results verified the arithmetic presented.