中文摘要：

将单周控制技术用于级联多电平变换器提高其控制性能。在理论分析的基础上．建立了级联多电平DC／AC变换器单周控制模型，并建立了4个3级H桥三相级联多电平电路仿真实例。在开关频率为2500Hz、滤波电感为4mH、滤波电容为14¨F、每级H桥直流侧电压为500V并在10％范围内变化时，变换器输出交流相电压幅值为1268V，线电压幅值为2193V，输出电压稳定，4个实例的电压THD均小于5％。理论与模拟实例分析表明：单周控制用于级联多电平变换器控制具有控制电路简单、控制效果好、输出稳定等特点。

英文摘要：

One cycle control technique is applied in cascaded multilevel converter to improve its performance. Based on the theoretical analysis,a cascaded multi-level DC/AC converter control model with one cycle control is proposed and four simulation examples of three-phase cascaded H-bridge multilevel converter are built., The output AC phase-voltage of converter is 1 268 V and its output line-voltage is 2 193 V when the switching frequency is 2 500 Hz,the filter inductance is 4mH,the filter capacitor is 14 IxF and the DC-side voltage of each H-bridge is 500 V with fluctuation under 10 % ,and the output voltage is stable. Four examples indicate the voltage THD is less than 5 %. Theoretical and simulative results show that,the cascaded multilevel converter with one cycle control has the advantages of simple control circuit,good control effect and stable output voltage.