双三电平光伏逆变器的拓扑与控制策略研究  

Research on the Topology and Control Strategy of the Dual Three-level Photovoltaic Grid-tied Inverter

作　　者：王宝基 张兴 曹仁贤[2] WANG Baoji;ZHANG Xing;CAO Renxian(National and Local Joint Engineering Laboratory for Renewable Energy Access to Grid Technology(Hefei University of Technology),Hefei 230009,Anhui,China;Sungrow Power Supply Co.,Ltd.,Hefei 230088,Anhui,China)

机构地区：[1]可再生能源接入电网技术国家地方联合工程实验室(合肥工业大学),安徽合肥230009 [2]阳光电源股份有限公司,安徽合肥230088

出　　处：《电气传动》2021年第20期3-9,23,共8页Electric Drive

基　　金：国家自然科学基金联合基金资助项目(U1766207)。

摘　　要：针对开绕组变压器双逆变器拓扑在光伏并网发电领域中的应用,提出了一种基于独立直流母线开绕组变压器双三电平逆变器拓扑的光伏并网发电系统结构。首先,在当前已广泛商用的两逆变器经双绕组变压器并联方案的基础上,给出了对该方案的改进思路,包括光伏组件类型的选择,开绕组变压器变比的选择,滤波器拓扑的选择等,所提方案可减小滤波器的体积和成本。然后,分析了所提拓扑的数学模型,并据此提出了一种可实现两逆变器独立最大功率点跟踪(MPPT)运行的控制方案。最后,通过相关仿真和实验研究,验证了所提方案的正确性。For the application of the open-end winding transformer(OEWT)dual inverter in the field of photovoltaic(PV)power generation,a kind of PV grid-tied system based on the OEWT dual three-level inverter with independent DC bus was proposed.First,on the base of the scheme that two inverter connected in parallel through two winding transformer,which was commercial used widely at present,the improvement ideas of the proposed scheme were presented.The improvements included the selection of the photovoltaic module types,the selection of the ratio of the open-end winding transformer and the filter topology and so on.The proposed scheme can save the filter volume and costs.Then,the mathematical model of the proposed scheme was analyzed,based on which,a new control strategy that can achieve independent maximum power point tracking(MPPT)control of the two inverters was presented.Finally,simulation and experiments were developed to verify the correctness of the proposed scheme.

关 键 词：光伏并网发电 开绕组变压器 双逆变器 滤波器 控制 

分 类 号：TM464[电气工程—电器]