海上风电直流耗能装置和保护配合策略研究

Research on coordination strategy for an offshore wind power DC chopper device and protection

首先对基于直流耗能装置的交流故障穿越方案进行了理论分析。根据适合海上风电工程的直流耗能装置的拓扑结构,对该直流耗能装置的工作模式、投退策略进行了分析研究。其次研究了带直流耗能装置的大型海上风电直流保护的范围和分区。确定了直流保护动作策略,重点研究了各个直流保护区的保护配置策略。然后研究了直流耗能装置的投退对直流保护功能的影响。重点研究了直流过电压保护与直流耗能投入电压值的配合策略,直流耗能装置的保护功能设计。最后对上述策略进行了仿真试验验证。

First,this paper analyzes the AC fault ride-through scheme based on the DC chopper device.Given the topological structure of a DC chopper device suitable for offshore wind power projects,its working mode and switching strategy are analyzed.Secondly,the scope and zoning of large-scale offshore wind power DC protection with a DC chopper are studied.The DC protection action strategy is determined,and each DC protection zone is focused on the protection configuration strategy.Then the influence of the switching on and off of the DC chopper on the DC protection function is studied.The focus is on the coordination strategy of DC overvoltage protection setting and the input voltage value of the chopper,and its protection function design.Finally,the above strategy is verified by simulation.