1.State Key Laboratory of Power Transmission Equipment & System Security and New Technology (Chongqing University), Chongqing 400044, China;2.College of Electric Engineering, Sichuan University, Chengdu 610065, China

The DC distribution network has become one of the important development directions for the power system because of its large power supply capacity, high reliability and strong controllability. Power quality is a key issue in the planning, design and operation control of DC distribution networks. This paper discusses the characteristics of the power quality in DC distribution network, and expounds the generation mechanism, impact and evaluation indicators of power quality events. Then, the transfer characteristics of power quality disturbance in DC distribution networks are analyzed. On this basis, the general method and framework of power quality disturbance location are sorted out, and the methods suitable for power quality disturbance location in DC distribution network are discussed. Also, the research status of power quality control in DC distribution network is reviewed, and the control methods of unbalanced voltage, voltage deviation, voltage fluctuation and harmonics are summarized. Finally, the future research trends of the power quality in the DC distribution network are discussed from the aspects of the definition and correlation of power quality indicators, the complexity of multi-level DC distribution network disturbance tracing, and the hybridity of DC power quality dynamic zoning management.