A fault-tolerant location method based on credibility fusion and sliding-mode control is proposed to automatically locate the transient voltage disturbance source(TVDS)in smart distribution networks with distributed generators(DGs)integrated. The system framework is set up first for fault-tolerant location of TVDS based on the networked power quality monitoring system(NPQMS). Then three critical function modules are realized

including power quality transient state estimation(PQTSE)

credibility analysis and fusion of direction-judgment

influence rules of DG integration. Based on the theory of sliding-mode control(SMC)

a novel method is proposed for automatic location of TVDS with fault tolerance. In its implementation

the direction-judgment with fusion credibility and the correction strategy for the direction misjudgment caused by DG integration have been integrated in the proposed location method. The proposed method is validated on an IEEE 34-bus distribution network with DG

the TVDS location results demonstrating the feasibility and effectiveness of the fault-tolerant location method. This work is supported by National Natural Science Foundation of China(No. 51407160)and Zhejiang Provincial Natural Science Foundation of China(No. LY17E070005).