基于光伏发电的直流微电网能量变换与管理.pdf

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基于光伏发电的直流微电网能量变换与管理.pdf

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2013 2 Vol.28 No. 2 28 2 TRANSACTIONS OF CHINA ELECTROTECHNICAL SOCIETY Feb. 2013 1 1 2 2 1 100084 2 210016 TM464 Energy Conversion and Management for DC Microgrid Based on Photovoltaic Generation Zhang Li 1 Sun Kai2 Wu Tianjin 1 Xing Yan 1 1Tsinghua University Beijing 100084 China 2 Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Abstract In order to optimize energy utilization and realize system stability, an energy conversion and management control based on improved DC bus signaling(DBS) is proposed for DC microgrid based on photovoltaic(PV) generation. The DC microgrid is composed of three modular DC-DC converters for PV arrays, two bidirectional grid-tied DC-AC converters, one DC-DC converter for battery charging/discharging and local loads, which is available of either grid-tied operation or islanding operation. The operations of system are categorized into four modes: islanding with battery discharging, grid-tied rectification, grid-tied inversion and islanding with constant voltage generation. The DC bus voltage level is employed as an information carrier to dete