论文部分内容阅读
介绍了基于五电平逆变器的异步电机矢量控制方法。提出了一种适用于中点钳位 H 桥五电平逆变器的空间矢量脉宽调制（SVPWM）算法，该算法先将参考电压矢量经过旋转处理都落于第一扇区，再利用十二条规则来判断其在第一扇区的具体小三角形区域。为防止逆变器输出矢量在扇区切换时发生突变，让两相邻小三角形区域的输出矢量变化方向相反。根据异步电机的数学模型及其按转子磁链定向的矢量控制方法对定子电压方程解耦可独立控制异步电机的定子电流励磁和转矩分量。仿真结果表明，该系统具有良好的静动态性能。“,”This paper introduces the vector control method of the induction motor based on the five-level inverter. A simple algorithm of space vector pulse width modulation (SVPWM) is proposed, which can be applied to the diode neutral point clamped (NPC) H-Bridge five-level inverter. In the algorithm, the reference voltage vector is rotated to the first sector firstly, and then the small triangle of the first sector the rotation-processed reference voltage lying is determined by twelve judging rules. The output vector of the two adjacent triangles changes in the opposite direction to eliminate the output voltage vector shift when sector changes. To control the stator flux current and torque current independently, the stator voltage equation is decoupled on the basis of the mathematical model of the AC induction motor and the basic principles of rotor field oriented vector control. Simulation results show that the system has good static and dynamic performance.