计算机与数字工程2016，Vol.44Issue(9)：1860-1864,5.DOI:10.3969/j.issn.1672-9722.2016.09.049
单相级联 H 桥多电平光伏并网逆变器控制方法磁
Control Method of Single-phase Cascaded H-bridge Multilevel Converter for Grid Connection of Photovoltaic Systems
邓永艳 1龚世缨2
作者信息
- 1. 金盘电气有限公司 海口 541004
- 2. 华中科技大学电气学院 武汉 430074
- 折叠
摘要
Abstract
The cascaded H‐bridge multilevel converter has attracted much attention in grid‐connected photovoltaic appli‐cations .The main reason is that each H‐bridge needs isolated DC‐sources ,which can be easily given by PV modules .The converter structure has high efficiency ,low current harmonic ,and is very flexible and modular .Since the PV strings operate at different maximum power points ,there is an inherent power imbalance that can produce voltage drift of the DC‐links .Mo‐reover that all the cells have the same circulating current ,hence it is not possible to implement an independent grid current control loop to control each DC‐link voltage .In this paper a control method for single‐phase cascaded H‐bridge multilevel converter for grid connection of photovoltaic systems is analyzed .Each DC‐link voltage is compared to the corresponding voltage reference ,and the sun of the errors is controlled through a PI controller that determines the grid current provided by the multilevel converter .The proposed control idea to overcome the drift problem in DC‐link voltage ,is to compensate in the modulation stage by changing the modulation index .Simulation results are presented to support the control method .关键词
单相级联 H 桥多电平逆变器/光伏发电系统/并网电流/直流侧电压漂移Key words
single-phase CHBMC/PV system/grid current/DC voltage drift分类
信息技术与安全科学引用本文复制引用
邓永艳,龚世缨..单相级联 H 桥多电平光伏并网逆变器控制方法磁[J].计算机与数字工程,2016,44(9):1860-1864,5.
