Abstract: As a large number of photovoltaics are locally connected to the distribution network,existing protection schemes based on local information or adjacent information both have some limitations.To this end,this paper analyzes the control strategy and fault characteristics of photovoltaic.Based on the composite sequence network after various types of faults in the distribution network with photovoltaic,a novel pilot protection scheme based on integrated sequence current is proposed.This scheme does not require voltage information and has low requirement for communication synchronization,and is suitable for middle and low voltage distribution networks with poor hardware conditions.Finally,a distribution network model with photovoltaic was establish by PSCAD/EMTDC software,verified the effectiveness of the scheme under various fault conditions.