摘要
基于二极管整流器(DR)的海上风电并网方案能大幅降低投资成本,但其控制和启动问题难以解决。主动换相型电流源换流器(CSC)具有较高的功率密度和较强的控制性能,但成本相对较高。文中提出一种基于DR与辅助CSC混合级联的海上风电直流输电并网系统,既能实现海上平台轻型化,又能解决DR的控制和启动问题。首先,对拓扑结构和数学模型进行分析;然后,提出海上风电并网系统的稳态控制策略和黑启动控制策略,并基于PSCAD/EMTDC进行仿真验证;最后,对所提方案进行经济性分析。结果表明,混合级联型海上风电并网系统能平稳完成风电场黑启动,具有良好的稳态特性,并能适应风电出力的波动。
The offshore wind power grid-connected scheme based on diode rectifier(DR)can greatly reduce the investment cost,but the problems of control and start-up are difficult to be solved.The actively commutated current source converter(CSC)has high power density and great control performance,but its cost is relatively high.This paper proposes a hybrid cascaded DC gridconnected transmission system for offshore wind power based on DR and auxiliary CSC,which can realize the miniaturization of offshore platform and solve the problems of control and start-up.First,the topology and mathematical model are analyzed.Then,the steady-state control strategy and black start control strategy are proposed for the offshore wind grid-connected system,and the simulation verification is performed based on PSCAD/EMTDC.Finally,the economic analysis of the proposed scheme is carried out.The results show that the hybrid cascaded offshore wind grid-connected system can smoothly complete the black start of wind farms,has good steady-state characteristics,and can adapt to the fluctuations of wind power output.
作者
夏嘉航
王晨欣
展瑞琦
赵成勇
郭春义
XIA Jiahang;WANG Chenxin;ZHAN Ruiqi;ZHAO Chengyong;GUO Chunyi(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2021年第21期129-138,共10页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(51877077)。
关键词
海上风电
混合直流输电
轻型化
电流源换流器
黑启动
经济性分析
offshore wind power
hybrid DC transmission
miniaturization
current source converter
black start
economic analysis
