Power generation maximization of distributed photovoltaic systems using dynamic topology reconfiguration

作     者：Xiaolun Fang Qiang Yang Wenjun Yan 

作者机构：College of Electrical EngineeringZhejiang UniversityHangzhou 310027China Zhejiang LabHangzhou 310000China 

出 版 物：《Protection and Control of Modern Power Systems》 (现代电力系统保护与控制（英文）)

年 卷 期：2022年第7卷第1期

页      面：508-522页

核心收录：

学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 0701[理学-数学] 10[医学] 

基　　金：support in part by the Technology Research and Development Program of Zhejiang Province (2022C01239) the National Natural Science Foundation of China (52177119) the Fundamental Research Funds for the Central Universities (Zhejiang University NGICS Platform). 

主　　题：Dynamical reconfiguration Inverter Switching matrix Mismatch losses 

摘      要：The‘mismatch losses’problem is commonly encountered in distributed photovoltaic(PV)power generation systems.It can directly reduce power generation.Hence,PV array reconfiguration techniques have become highly popular to minimize the mismatch losses.In this paper,a dynamical array reconfiguration method for Total-Cross-Ties(TCT)and Series-Parallel(SP)interconnected PV arrays is proposed.The method aims to improve the maximum power output generation of a distributed PV array in different mismatch conditions through a set of inverters and a switching matrix that is controlled by a dynamic and scalable reconfiguration optimization algorithm.The structures of the switching matrix for both TCT-based and SP-based PV arrays are designed to enable flexible alteration of the electrical connections between PV strings and inverters.Also,the proposed reconfiguration solution is scalable,because the size of the switching matrix deployed in the proposed solution is only determined by the numbers of the PV strings and the inverters,and is not related to the number of PV modules in a string.The performance of the proposed method is assessed for PV arrays with both TCT and SP interconnections in different mismatch conditions,including different partial shading and random PV module failure.The average optimization time for TCT and SP interconnected PV arrays is 0.02 and 3 s,respectively.The effectiveness of the proposed dynamical reconfiguration is confirmed,with the aver-age maximum power generation improved by 8.56%for the TCT-based PV array and 6.43%for the SP-based PV array compared to a fixed topology scheme.