摘要
为兼容当下跟网型和未来构网型远海风场的送出需求,提出一种送端采用由二极管整流器(diode rectifier unit,DRU)和小容量电压源型辅助换流器交流侧单端并联组成混合换流器的低成本直流送出方案。新方案利用常规小容量电压源换流器结合耗能单元和若干快速开关,通过直流海缆复用和快速开关倒闸拓扑重构,在不影响风能向外传输的基础上实现了海上风场黑启动。针对跟网型风场的运行要求,提出一种由辅助换流器同时控制其交流侧和直流侧电压的构网策略,解决了海上交流电网构建、调控和无功平衡等问题;为适应未来构网型风场,提出一种辅助换流器构网-跟网控制模式切换策略,无需进行方案拓扑改造。最后,通过算例仿真,验证了所提方案和控制策略的有效性。
A low-cost DC transmission scheme with a hybrid converter adopted at the sending end was proposed for the compatibility of the current grid-following and the future grid-forming offshore wind farm transmission requirements.The hybrid converter compriseda diode rectifier unit(DRU)and a small-capacity voltage source auxiliary converter;only the AC sides were in shunt connection.A conventional small-capacity voltage source converter combined with energy-consuming units and several fast switches was employed in the proposed scheme.Meanwhile,by the multiplexing of DC marine cable and the topology reconstruction by the fast switch switching operations in the proposed scheme,the black start of the offshore wind farm was realized with no influence on the wind power transmission.According to the operation requirements of the grid-following wind farm,a grid-forming strategy adopted by the auxiliary converter was proposed,which could simultaneously control the voltages of the AC side and DC side of the auxiliary converter.So,problems such as offshore AC power grid construction,regulation,and reactive power balance were solved.A switching strategy between the grid-forming and grid-following mode of the auxiliary converter was proposed to adapt to the future grid-forming wind farm without changing the proposed scheme topology.Finally,the effectiveness of the proposed scheme and control strategies were verified by software case simulations.
作者
袁庆伟
谢晔源
姜田贵
段军
YUAN Qingwei;XIE Yeyuan;JIANG Tiangui;DUAN Jun(NR Electric Co.,Ltd.,Nanjing 211102,Jiangsu Province,China)
出处
《电网技术》
EI
CSCD
北大核心
2024年第11期4482-4492,I0021-I0024,I0020,共16页
Power System Technology
基金
国家重点研发计划项目(2021YFB2401100)。
关键词
远海风场送出
二极管整流器
混合换流器
黑启动
构网
构网-跟网切换
offshore wind power transmission
diode rectifier
hybrid converter
black start
grid-forming
switching between grid-forming and grid-following
作者简介
通信作者:袁庆伟(1988),男,博士,高级工程师,研究方向为AC-DC变流器技术,E-mail:yuanqw@nrec.com;谢晔源(1978),男,硕士,教授级高级工程师,研究方向为柔性直流输电、柔性交流输电和无功补偿技术,E-mail:xieyy@nrec.com。
