一种优化的单电阻电流采样矢量控制算法研究

Research on Vector Control Based on an Optimized Single-Shunt Current Sensing

在低成本的应用场合中,通过对直流母线电流进行采样,就可以有效地重构出逆变器输出侧的相电流。然而,有效矢量的持续时间有可能很短,以至于通过传统的SVPWM控制无法可靠地进行电流采样。在传统PWM移相的基础上,新加入了防饱和机制,可以实现对于相电流的高质量重构。在矢量控制平台上进行了实验,论证了该算法的正确性与可行性。

In some applications where low cost is required, the phase current at the output side of the inverter can be effectively reconstructed by sampling the DC bus current. However, the duration of an effective vector may be so short that the current cannot be sampled reliably by the conventional space-vector pulse-width modulation （SVPWM） algorithm. An optimized method was proposed based on the traditional PWM phase shift, the anti-saturation mechanism was newly added, which can realize high-quality reconstruction of phase current. Experiment platform was established and the SVPWM was employed. The experimental results demonstrate the correctness and feasibility of the proposed method.