一种单相级联光伏逆变器分散式控制策略  

A Decentralized Control Strategy for Single-Phase Cascaded Photovoltaic Inverters

作　　者：罗朝旭 秦建衡 罗钦[1] 张博 LUO Zhao-xu;QIN Jian-heng;LUO Qin;ZHAN GBo(College of Electrical&Information Engineering,Hunan University of Technology,Zhuzhou Hunan 412007,China)

机构地区：[1]湖南工业大学电气与信息工程学院,湖南株洲412007

出　　处：《计算机仿真》2024年第7期157-160,375,共5页Computer Simulation

基　　金：国家自然科学基金青年项目(52207205);湖南省教育厅资助科研项目(22B0563,21B0776)。

摘　　要：级联逆变器能够提高效率和节省成本,因此在光伏并网发电系统中的应用日益广泛。为了实现不同发电能力或容量的逆变器串联,并使得各单元能够独立完成最大功率点跟踪,提出了一种能实现MPPT的单相级联光伏逆变器的分散式控制策略。通过把传统下垂控制表达式进行改进,将每个光伏单元输出的实际功率跟踪于最大功率点功率,电压幅值正比于最大有功功率,从而使得各单元的输出电压频率、相位自同步且无需通信,输出电压幅值可调且与自身实际功率容量成正比。最后基于Matlab/Simulink平台搭建了三台光伏单元级联并网仿真模型,结果验证了所提方法的可行性与有效性。Cascaded inverters can improve efficiency and save costs,so they are increasin gly used in photovoltaic grid-connected power generation systems.In order to realize the series connection of inv erters with different power generation capabilities or capacities,and to enable each unit to independently complete the maximum power point tracking,this paper proposes a decentralize d control strategy for single-phase cascaded photovoltaic inverters that can realize MPPT.By improving the traditionald roop control expression,the actual power out put by each photovoltaic unit is tracked to the maximum power point power,a nd the voltage amplitude is proportional to the maximum active power,so that the output voltage frequency and phase of each unit are self-synchronized without the need for Communication,the output voltage amplitude is adjusta ble and proportional to its actual power capa city.Finally,based on the Matlab/Simulink platform,a simulation model of cascaded grid connection of three photov oltaic units is built,and the results verify the feasibilityand effective ness of the proposed method.

关 键 词：级联逆变器 分散式控制 最大功率点跟踪 功率平衡控制 光伏并网系统 

分 类 号：TM743[电气工程—电力系统及自动化]