大容量风电场的并网方案及升压站设计优化

Optimization of Booster Station Design and Grid Connection Scheme of Large Capacity Wind Farm

1座300 MW风电场原并网方案为建设3座容量为100 MVA升压站,将集电线路电压等级由35 kV升至220 kV,经3回线路并入电网。为降低升压站建设成本,结合站址相对位置特点,将原方案中的3座升压站改为2座35 kV开关站和1座220 kV汇集站,大大降低送出线路长度,减少对侧站新建进线间隔数,降低出线部分投资。同时,将汇集站内3台100 MVA主变压器改为1台100 MVA双绕组变压器和1台200 MVA分裂变压器,达到降低设备投资,减少占地面积的目的。

The present work aimed at optimizing the design of a 300 MW wind farm in which there planned to build three 100 MVA booster stations to raise the voltage level of collection line from 35 kV to 220 kV enabling grid connection through three circuits.In order to reduce construction cost of booster station,considering relative location characteristics of station site,the three booster stations in the original plan were changed to two 35 kV switch stations and one 220 kV collection station,greatly reducing length of transmission line,reducing number of new incoming line intervals at the opposite station,and reducing investment for outgoing lines.At the same time,the three 100 MVA main transformers in the collection station were changed to one 100 MVA double winding transformer and one 200 MVA split transformer,thus reducing equipment investment and land occupation.