基于2路输入的三电平光伏并网系统的研究  

Development of Three-level Photovoltaic Grid-connected System Based on Two-input

作　　者：周皓[1,2] 童朝南[1] 王芸[3] 苗亮亮[1] 

机构地区：[1]北京科技大学信息工程学院,北京100083 [2]北方工业大学机电工程学院,北京100041 [3]南昌工程学院计算机科学与技术系,江西南昌330099

出　　处：《电气传动》2012年第5期20-22,55,共4页Electric Drive

摘　　要：为了克服光伏并网系统传统的两电平、单路输入在稳定性和效率上的不足,设计了一种系统。该系统由两级组成:前级采用两条支路输入,每条支路都由独立的Boost来实现最大功率点跟踪;后级采用中点钳位式三电平拓扑结构。采用电压外环,电流内环的双闭环控制方式。实验结果表明了所提出的控制方案具有良好的稳定性和很高的效率。To overcome traditional photovoltaic grid-connected system using single-input and two-level with low steady and little efficiency,a system was designed. The system is composed of two level, the first level has two input branches, and both branches have independent boost converters to realize maximum power point tracking （MPPT）,and neutral point clamped （NPC） three level topology are used in the second level. Dual closed loop control is realized with external voltage loop and inner current loop. The experimental results verify that：the proposed method of control scheme has very good stabilization and high efficiency.

关 键 词：逆变器 闭环 最大功率点跟踪 中点钳位 

分 类 号：TM46[电气工程—电器]