基于耦合电感单级升压逆变器的光伏并网发电系统  

A Grid-Connected Photovoltaic Generation System Based on Single-Stage Voltage Step-Up Inverter With Coupled Inductor

作　　者：周玉斐[1] 黄文新[1] 赵萍[1] 赵健伍[1] 

机构地区：[1]江苏省新能源发电与电能变换重点实验室(南京航空航天大学),江苏省南京市210016

出　　处：《电网技术》2013年第7期1808-1813,共6页Power System Technology

基　　金：国家自然科学基金项目(50977045);中央高校基本科研业务费专项资金资助项目(CX10B_101Z)~~

摘　　要：提出了基于耦合电感单级升压逆变器的光伏并网发电系统,其可在一级变换器中实现升压、逆变、单位功率因数并网和最大功率跟踪(maximum power point tracking,MPPT)的功能。该拓扑在电压源和三相逆变桥间加入包含耦合电感的无源网络,通过调节桥臂的直通占空比和耦合电感的匝比,实现母线电压的提升。由于桥臂直通成为一种正常工作方式,系统的可靠性得到了提高。此外,采用单级逆变器和通过采样输出电流实现MPPT的方式简化了系统,降低了成本且易于实现。算例结果验证了该方法的可行性。A grid-connected photovoltaic（PV） generation system based on single-stage voltage step-up inverter with coupled inductor,which can implement the functions of voltage step-up,DC-to-AC inversion,grid-connection under unity power factor and maximum power point tracking（MPPT） by a single-stage inverter,is proposed.A passive network containing coupled inductor is added-in between voltage-source and three-phase inverter bridge and by means of adjusting duty ratio of shoot-through zero vector and turns ratio of inductor,the bus voltage step-up can be implemented.Because the shoot-through of bridge arm becomes a normal operation mode,the reliability of PV generation system can be improved,in addition,the PV generation system is simplified as a result of utilizing singe-stage inverter and MPPT is implemented by sampling output current,thus the PV generation system is easily realized and its cost is reduced.The feasibility of the proposed method is verified by results of experimental test.

关 键 词：耦合电感 光伏 单级逆变器 并网 直通零矢量 最大功率跟踪 

分 类 号：TM721[电气工程—电力系统及自动化]