海上风电直流并网工程用新型柔性直流耗能装置电气设计研究

Research on Electrical Design of Novel Flexible DC Energy Consuming Device for Offshore Wind Power DC Grid Connection Project

直流耗能装置是解决岸上交流系统故障情况下的海上风电场故障穿越难题的最有效途径,为此,文中提出一种海上风电直流并网工程用新型柔性直流耗能装置,明确耗能装置拓扑及其功率控制原理,研究耗能装置电气参数设计方法,通过仿真验证耗能装置的电气特性及在海上风电并网工程中的运行效果,与传统直流耗能装置相比,提出的直流耗能装置具备阻值连续可调的柔性直流负载特性,运行时对直流系统影响较小;主辅开关同时参与功率调制,开关器件电热应力更小,安全裕度更大;主耗能电阻可集中户外布置,技术成熟,可靠性高。

DC energy consumption device is the most effective way to solve the problem of offshore wind farm fault ride-through(FRT) in the case of onshore AC system failure. Therefore, this paper presented a new type of flexible DC energy consumption device for offshore wind power DC grid connection project, which clarifies the energy consumption device topology and its power control principle. The electrical parameter design method of the energy consuming device was studied. The electrical characteristics of the energy consuming device and its operating effect in offshore wind power DC grid connection engineering were verified by simulation. Compared with the traditional DC energy consuming device, the proposed DC energy consumption device possessed the characteristics of a flexible DC load with continuously adjustable resistance, which had a small impact on the DC system during operation;the main and auxiliary switches participate in power modulation at the same time, the electrical thermal stress of the switching device was smaller, and the safety margin was greater;The resistor can be arranged outdoors, with mature technology and high reliability.