Maximum power point tracking scheme with partial shading detection for two-stage grid-connected photovoltaic inverters

被引:5
作者
Huang, Lei [1 ,2 ]
Zhang, Jiyuan [1 ,2 ]
Cui, Qiong [1 ]
Wang, Hao [1 ]
Shu, Jie [1 ,2 ]
机构
[1] Chinese Acad Sci, Guangzhou Inst Energy Convers Energy Convers, Key Lab Renewable Energy, Guangzhou, Guangdong, Peoples R China
[2] Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing, Peoples R China
来源
JOURNAL OF ENGINEERING-JOE | 2019年 / 16期
关键词
search problems; photovoltaic power systems; invertors; maximum power point trackers; partial shading detection; two-stage grid-connected photovoltaic inverters; maximum power point tracking method; modified PI incremental conductance; PS detecting approach; voltage deviation; global maximum power point; global search scheme; appropriate voltage reference; termination criteria; modified PI-based IC method; local search process; step-changing changing insolation; gradual-changing insolation; global search process; IC method; MPPT; PV SYSTEM; INSOLATION; OPTIMIZATION; UNIFORM; COMPENSATION; ALGORITHM; ARRAYS;
D O I
10.1049/joe.2018.8547
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This paper proposes a maximum power point tracking (MPPT) method with partial shading (PS) detection based on modified PI incremental conductance (IC) for photovoltaic inverters. To accurately trigger the algorithm, a PS detecting approach based on voltage deviation is derived through the comparison of voltage and current characteristics under uniform and non-uniform insolation. To track the global maximum power point (GMPP) precisely and fast, a global search scheme considering appropriate voltage reference, search direction and termination criteria is presented. The modified PI-based IC method is implemented in the local search process. In order to verify the effectiveness of the algorithm, the proposed method is utilised in the two-stage grid-connected photovoltaic inverters built in MATLAB/Simulink. The performance of the scheme is compared with the traditional IC method under step-changing and gradual-changing insolation and various temperature. In all simulation cases, the proposed approach can identify the PS with multiple local maxima, accurately trigger the global search process and track the GMPP. The search periods are around 0.1-0.2s, and the efficiencies of PV generation under steady state are normally above 99.5%. The presented method can improve the efficiency of distributed and centralised PV system.
引用
收藏
页码:2556 / 2562
页数:7
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