大规模新能源发电集群直流汇集及输送方案研究

摘要

随着多端直流和直流电网等先进输电技术的不断发展,在中国大规模新能源发电基地逐步构建直流汇集与输送系统,并与现有的交流电网互联,形成高比例新能源接入的交直流混联系统,将会成为中国未来电网形态发展的主要特点之一.针对中国西部地区大规模新能源发电集群的直流汇集及输送问题,深入分析了新能源电站场站内部、场站之间的汇集组网方式,并基于分层分区的原则设计了大规模新能源发电集群多层级直流汇集与输送系统方案,在此基础上,以中国甘肃酒泉地区千万千瓦级新能源发电基地为场景,设计了相应的汇集输送方案,并对其输送容量、电压等级、关键设备需求进行了探讨,为未来大规模新能源发电集群的直流汇集与输送方案的研究与建设提供参考.%With rapid development of advanced transmission technologies such as MTDC and DC grids,it may become one of main features for China's future grids that collect and transmit large renewable energy generation using DC technologies,and eventually form AC-DC hybrid power grids with high proportion of renewable energy generation connected.In this respect,a few studies have been conducted currently.This paper at first analyzes network topology characteristics of both renewable energy generation station and clusters are analyzed first.Based on the "lay and zone" criterion,a typical DC grid with multiple voltage levels for collection and transmission of large-scale renewable energy generation cluster is designed.The proposed design is presented based on scenario of Jiuquan renewable energy generation cluster.The requirements for transmission capacity,voltage levels and key equipment of such DC grid are also discussed.The results provide reference for future research of using DC technologies for collection and transmission of large-scale renewable energy generation cluster.