一种新型模块化多电平光伏并网系统.pdfVIP

第 35 卷 第 23 期 中 国 电 机 工 程 学 报 Vol.35 No.23 Dec. 5, 2015 5976 2015 年 12 月 5 日 Proceedings of the CSEE ©2015 Chin.Soc.for Elec.Eng. DOI ：10.13334/j.0258-8013.pcsee.2015.23.003 文章编号：0258-8013 (2015) 23-5976-09 中图分类号：TM 615 一种新型模块化多电平光伏并网系统 荣飞，刘诚，黄守道 (湖南大学电气与信息工程学院，湖南省 长沙市 410082) A Novel Grid-connected PV System Based on MMC RONG Fei, LIU Cheng, HUANG Shoudao (College of Electrical and Information Engineering, Hunan University, Changsha 410082, Hunan Province, China) ABSTRACT: In order to solve the low efficiency and serious 用率高等优势。同时，在光伏组件出现故障时能及时进行容 impaction on public grid of PV system under partial shading, 错处理，保证了系统的可靠运行。仿真实验结果验证了该系 this paper proposed a novel PV (Photovoltaic) topology and its 统及其控制策略的可行性。 control method based on modular multilevel converter (MMC). 关键词：模块化多电平逆变器；光伏电源；并网系统；冗余 The novel topology connects a PV module to the capacitor of 控制；最大功率点跟踪 each sub-module (PM) of MMC in parallel. When there is a partial shading, the maximum power can be achieved by 0 引言 regulating each PM’s capacitor voltage to the maximum power 光伏系统中，一般将数十个光伏组件串联以提 point voltage without additional hardware cost. Based on the novel topology, the maximum power tracking control, 高输出电压。受限于这种连接方式，当出现局部阴 redundancy control, voltage stable control and grid-connected 影时，整条支路的电流急剧降低，所有组件都不能 control were studied carefully. Compared to the traditional 工作在最大功率点。文献[1]中对每个光伏组件反并 series topology, the proposed topology has the advantage of 联一个二极管，当