Studies On Power Quality Of Xinjiang Grid About Integrated With Electrified Railway

Electrified railway has significant advantages in transport efficiency, energy saving and environmental protection,however, electrified railway traction load will affect power quality due to negative sequence, harmonic, random fluctuations.With the contraction that electrified rebuilding project between Hongliuhe section and Alashankou section in Lan-xin Railway,a large number of electrified railway traction station connect to Xinjiang Grid,which is the largest 220kV regional power grid in the world and include many types power supply such as hydropower, thermal power and wind power, this need some analysis and research about problems emerge in power quality which caused by electrified railway.This paper builds Xinjiang Grid model and electrified railway traction load equivalent model on the basis of power system simulation and analysis software DIgSILENT PowerFactory,using the methods that harmonic power flow calculation, unbalanced power flow calculation and impedance scanning,assessing the influence on Xinjiang Grid power quality which caused by electrified railway form harmonic and three-phase voltage unbalance,and combine the result of assessment with the characteristics of Xinjiang Grid,proposing power quality comprehensive treatment scheme.Via modeling and simulation analysis in DIgSILENT PowerFactory,the outcome shows that power quality is capable of reaching the national standard after improved,then the correctness of scheme is verified.Through theoretical illation and simulation analysis,this paper study the power quality and stability impact of the fact that electrified railway traction load and wind farm integrate one point of regional grid in Xinjiang from the perspective of power fluctuations, harmonics and negative sequence, and the solutions were analyzed and discussed which provide reference for similar problem and hold practical significance.