大型光伏电站全直流送出关键问题研究

RESEARCH ON KEY ISSUES OF FULL DC TRANSMISSION SCHEME FOR LARGE-SCALE PHOTOVOLTAIC POWER STATIONS

研究浙江舟山地区小洋山薄刀咀118 MW光伏电站全直流送出方案。介绍全直流送出系统的构建原理,重点阐述拓扑结构选择、接地方式、直流电压控制等关键技术问题。明确多级直流升压系统的构建原理。在PSCAD/EMTDC平台上搭建相应仿真系统,通过时域仿真验证所提小洋山薄刀咀118 MW光伏电站全直流送出方案的可行性。

This paper studies the full DC transmission scheme of 118 MWp photovoltaic power station in Xiaoyangshan Bodaozui island of Zhoushan,Zhejiang Province.The construction principle of the full DC transmission system is introduced,and the key technical issues such as the topology selection,the grounding method,and the DC voltage control are clarified.The composition principle of DCDC converters at all levels is specified.A corresponding simulation system is built on the PSCAD/EMTDC platform and the time-domain simulation verifies the feasibility of the proposed full DC transmission scheme of 118 MWp photovoltaic power station in Xiaoyangshan Bodaozui island.