适用于海上风电场的新型高压直流变换器与直流故障隔离  

A Novel HVDC Converter and DC Fault Isolation for Offshore Wind Power Farm

作　　者：周荔丹 介子豪 姚钢[2] 李东东 黎灿兵 ZHOU Lidan;JIE Zihao;YAO Gang;LI Dongdong;LI Canbing(School of Electrical Engineering,Shanghai Electric Power University,Yangpu District,Shanghai 200090,China;School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Minhang District,Shanghai 200240,China)

机构地区：[1]上海电力大学电气工程学院,上海市杨浦区200090 [2]上海交通大学电子信息与电气工程学院,上海市闵行区200240

出　　处：《中国电机工程学报》2021年第17期6013-6024,共12页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2018YFB2100100);上海市自然科学基金(18ZR1418400)。

摘　　要：传统的海上风电场通常使用占地面积大且价格昂贵的变压器,以及高压交直流变换器具有双向功率流通功能,增加了海上风电升压平台的体积和重量,经济性较差。因此,直流电网技术将成为深远海大型海上风电系统并网有效解决的方案。该文提出一种适用于海上风电系统直流汇集和传输的非隔离型、高升压比直流变换器新型拓扑结构,可以低成本连接高电压差直流电网,设计多工况下单向功率流控制方案。所提直流变换器的主要挑战是平衡每个桥臂上子模块电容电压,为此,提出相关的闭环控制策略。基于Matlab/Simulink软件对所提拓扑进行稳态和短路故障仿真分析,最后,搭建实验平台,验证所提理论分析的合理性。Traditional offshore wind farms usually use transformers that cover a large area and are expensive, as well as high-voltage AC-DC converters with bi-directional power flow function, which increases the volume and weight of offshore wind power Booster platform and is less economical. Therefore, DC grid technology will become an effective solution for the grid connection of large-scale offshore wind power system. This paper presented a novel topology of non-isolated and high Boost ratio DC/DC converter for DC collection and transmission of offshore wind power system, which can be connected to high voltage difference DC power grid with low cost. Then one-way power flow control scheme was designed under multiple working conditions. The main challenge of the proposed DC/DC converter was to balance the capacitor voltage of each sub module on the bridge arm. Based on MATLAB/Simulink, the steady state and short-circuit faults of the proposed topology were simulated and analyzed. Finally, an experimental platform was built to verify the correctness of the theoretical analysis.

关 键 词：海上风电场 交直流变换器 直流电网技术 非隔离型 高升压比 直流变换器 闭环控制策略 

分 类 号：TM761.2[电气工程—电力系统及自动化]