A Novel Pilot Protection for AC Line of Wind Power Transmitted Through DC System Based on Mode Power Difference
The fault characteristics of AC transmission lines are significantly influenced by the access of wind farms and DC systems,rendering traditional relay protection principles inap-plicable.In this paper,we propose a new principle of pilot pro-tection for wind power transmission line based on difference of mode power.Firstly,on the basis of the single unit model,the short-circuit current expression of the doubly-fed wind farm is derived considering the interaction between the various devices of the wind farm.The establishment of a mode power calcula-tion model for the back side system feeding to the transmission line is complemented by incorporating DC system network to-pology.The protective criterion associated with the mode dif-ference and model difference is constructed by utilizing the characteristics of the fault network topology change outside the zone,aiming to identify fault sections.Finally,the proposed method is validated through experimental results conducted on the RT-LAB platform.
wind power DC transmission systemdouble-fed wind farmpilot protectionmode component
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