一种简单的三电平逆变器PWM控制算法

常用的空间电压矢量三电平逆变器PWM控制算法生成模式多 ,运算量大[1] 。本文利用一种新的电压矢量调制方法———统一电压调制技术 (UnifiedVoltageModulationTechnique ,UVMT) [2 ] ,实现一种简易的电压矢量调制。该算法不仅能够实现空间电压矢量PWM方法 ,SVPWM ,并且能够实现对直流链电容中点电位的实时控制。本文在详细描述UVMT的基础上 ,将其应用于三电平逆变器。仿真结果表明 ,该方法实现简单 ,能够实现与空间电压矢量算法完全一致的控制效果 ,是一种很有前途的算法

A Simple PWM Control Algorithm for Three- Level Inverter

There are several calculation modes in the traditional space vector algorithm, and which is very involved to be brought out. A novel method, named Unified Voltage Modulation Technique (UVMT) is adopted in this paper and concise voltage modulation arithmetic is achieved. Both space voltage PWM and the real time control of the middle point potential of the DC LINK can be realized easily. The UVMT is described in detail and then it is applied to the three level inverter. The computer simulation result shows that the method mentioned above is very simple to be carried out while the control effect is same as that of the SVPWM. It will be used widely in the coming future.