电力系统自动化2017，Vol.41Issue(15)：121-128,8.DOI:10.7500/AEPS20161119001
基于阻抗源变换器的光伏直流升压汇集系统
Impedance-source Converter Based Direct Current Step-up Collection System for Photovoltaic
摘要
Abstract
A novel structure of direct current (DC) step-up collection system for photovoltaic (PV) with consideration of impedance network concept has been proposed to cope with technical challenges to large-scale PV station.An impedance-source multi-module cascaded DC-DC step-up converter serves as the key device for the proposed collection system,which has an integrated function of multi-channel maximum power point tracking (MPPT) control and high-gain DC step-up conversion.The low-voltage DC bus and distributed MPPT devices can be forgone to make the system simple and reliable.The system structure is beneficial to internal fault isolation and unitary dynamic control at station level.The introduction of impedance network makes it possible to adjust the voltage gain flexibly as well as resist shoot-through of bridge arms,which can improve the operational adaptability against input power mismatch and reliability of the DC step-up collection system for PV.A detailed introduction of system architecture,key DC step-up converter,working principle and control/modulation strategy has been given.All theoretical results have been validated by system simulation under balanced and mismatched power inputs.The proposed DC step-up collection system has a potential application value in the future construction of large-scale PV stations.关键词
直流光伏电站/直流升压汇集/阻抗网络/直流升压变换器/最大功率跟踪Key words
direct current photovoltaic station/direct current step-up collection/impedance network/direct current step-up converter/maximum power point tracking引用本文复制引用
蔡文迪,朱淼,李修一,何国庆,蔡旭..基于阻抗源变换器的光伏直流升压汇集系统[J].电力系统自动化,2017,41(15):121-128,8.基金项目
国家自然科学基金资助项目(51477102) （51477102）
国家电网公司科技项目"大型光伏电站直流升压汇集接入关键技术及设备研制".This work is supported by National Natural Science Foundation of China (No.51477102) and State Grid Corporation of China. （No.51477102）
