离网条件下的三相四桥臂逆变器控制策略研究

摘要

针对微电网中用户负载可能不平衡的特点，研究了一种用于微电网系统的三相四桥臂逆变器。建立三相四桥臂逆变器在a-b-c静止坐标系下和d-q同步旋转坐标系下的数学模型。利用对称分量法对逆变器输出电压进行基波正序、负序和零序分量分解，研究分别采用正序、负序和零序旋转坐标系下的电压、电流双闭环控制方法，搭建了以英飞凌XE164 FN单片机为控制核心的硬件实验平台，并进行实验研究，实验结果证明所用控制方法的正确性。%A three-phase four-leg inverter is designed to adapt the unbalance loads in the microgrid.Its mathematical models are realized on the a-b-c stationary frame and d-q synchronous rotation reference frame respectively , the symmetrical compo-nent method is used to abstract the fundamental-frequency positive sequence , zero sequence and negative sequence for the re-lated voltages and currents , the outer voltage loop and inner current loop are studied based on the sequence components on the d-q synchronous rotation reference frame, a prototype in the core of XE164FN is established.The experiments are done and its results verify that the control strategy is right.