级联多电平高压DC/AC变换器单周控制策略  

Cascaded multilevel high-voltage DC/AC converter with one cycle control

作　　者：李承[1] 沈文[2] 丁洪发[1] 文劲宇[1] 

机构地区：[1]华中科技大学电气与电子工程学院强电磁工程与新技术国家重点实验室,湖北武汉430074 [2]常州供电公司,江苏常州213000

出　　处：《电力自动化设备》2011年第10期6-11,共6页Electric Power Automation Equipment

基　　金：国家科技支撑计划资助项目(2007BAA12B03);国家自然科学基金资助项目(50777026)~~

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2 500 Hz、滤波电感为4 mH、滤波电容为14μF、每级H桥直流侧电压为500 V并在10%范围内变化时,变换器输出交流相电压幅值为1 268 V,线电压幅值为2 193 V,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。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.

关 键 词：级联多电平 DC/AC 变换器 单周控制 建模 

分 类 号：TM464[电气工程—电器]