一种三电平光伏并网逆变器SVPWM的优化算法  

An optimized SVPWM algorithm for three-level photovoltaic gridconnected inverter

作　　者：文家燕[1] 刘胜永[1] 袁海英[1] 邵章平[2] 

机构地区：[1]广西科技大学电气与信息工程学院,广西柳州545006 [2]合肥工业大学电气与自动化工程学院,安徽合肥230009

出　　处：《广西工学院学报》2013年第4期31-36,共6页Journal of Guangxi University of Technology

基　　金：广西高校科学技术研究立项项目(2013LX083);广西工学院科学基金(1166203)资助

摘　　要：三电平逆变器具有耐压等级高、谐波含量低、开关损耗小等优点,应用于光伏并网发电领域能提高系统的容量和效率,但是其空间矢量调制(SVPWM)存在运算复杂、实现困难等问题.文章在介绍三电平光伏并网逆变器的主电路结构和工作原理基础上,针对其SVPWM算法的复杂性,提出了一种三电平SVPWM的简易算法,将三相正弦调制波修正到两电平下,利用零序分量注入法实现两电平下的SVPWM调制并反修正到三电平,使得运算量大为化简.搭建10 kW三电平光伏并网逆变器实验平台,实验证明了本文提出的简易调制策略的正确性.Three-level inverter promotes the virtues of high stress level, low voltage distortion, low harmonic content, and increases the capacity and efficiency of PV system. However, three-level SVPWM is complex and hard to implement. In this paper topology structure and principle of three-level photovohaic grid-connected inverter are introduced. Then, according to the complexity of three-level SPWM, a simple SVPWM algorithm is proposed, which corrects three phase sine modulation waves to two level, and makes the calculation simple. A three-level photovoltaic grid-connected inverter rated 10kW is built, and experimental results demonstrate the correctness of the simple algorithm.

关 键 词：三电平 并网逆变器 空间矢量调制 零序分量 

分 类 号：TM46[电气工程—电器]