海上风电多端柔性直流输电及其功率流控制

Multi-terminal Flexible DC Transmission and Power Flow Control of Offshore Wind Power

相比目前已有的工程而言,未来的海上风电场容量将更大,且离岸距离也更远,而基于电压源换流器的多端直流输电系统可以经济有效地联接广域分布的海上风电场,大规模地传输波动的风能至各陆地电网。以大型海上风电场送出为研究对象,提出一种结合电压源换流器和电池储能的多端柔性直流输电系统,给出系统的功率流控制方法,实现网侧换流器的功率分配及功率平滑输出。最后,基于RTDS硬件在环实验平台构建一个四端直流输电测试系统,并用实验验证所提多端柔性直流输电系统功率流的控制效果。

Compared with existing projects,future offshore wind farms will have a larger capacity and be further offshore.The multi-terminal DC transmission system based on voltage source converter stations can economically and effectively connect wide-spread offshore wind farms and transmit fluctuating wind energy to various land-based power grids on a large scale.A multi-terminal flexible DC transmission system combining voltage source converter station and battery energy storage is proposed,and the power flow control method of the system is given to realize the power distribution and smooth power output of the grid side converter station.Finally,a four-terminal HVDC testing system is constructed based on RTDS hardware in the loop test platform,and the power flow control effect of the proposed multi-terminal flexible HVDC system is verified by experiments.