三相AC/DC双向变流器的控制研究

Research on the Control of Three-Phase AC/DC Bi-Directional Converter

三相AC/DC双向变流器由于能够实现能量的双向传输,在电机控制、汽车电子、新能源发电等领域有非常广泛的应用。为提高三相逆变器的可靠性和降低其成本,文中提出全数字软件锁相环和传统PI控制以及改进后的PI控制策略。通过对采样三相电网电压的矢量控制,实现了d、q轴电流的解耦控制,使q轴电流控制有功功率,d轴电流控制无功功率。此控制策略为三相并网逆变器提供一种高效的解决方案,最后通过实验验证了该方案的正确性与可行性。

Because AC/DC three-phase bi-directional converter can realization bi-directional transmission,it has very wide application in the fields such as motor control,automotive electronics,and new energy power generation.In order to improve the reliability and reduce the cost of the three-phase inverters,this article proposed the full digital software phase-locked loop and the traditional PI control as well as the improvement PI control strategy.By sampling the vector control of three-phase voltage,it realize the d and q axis decoupling control of electric current,q-axis current control of the active power,d-axis current control of reactive power.This control strategy provides one kind of highly effective solution for the three-phase grid-connected inverter,finally confirms the accuracy and the feasibility of this plan through the experiment.