Voltage Sag Test And Analysis In Dongguan Substation

In recent years,with the rapid development of modern industrial technology,computer,voltage information equipment,precision instruments,high-end manufacturing industries such as sag sensitive equipment widely used,the system power quality made more stringent requirements.The power grid voltage sags not only affect the stability of the power system,but also directly affect the quality and economic benefits of the users.Therefore,the voltage sag problem has been widely concerned by the power supply departments and users.The research and analysis of voltage sag is of great practical significance.Based on the actual situation of voltage sags in Dongguan power grid,this paper makes an in-depth study on the two aspects of the voltage sag test scheme of Dongguan substation and the optimal allocation of voltage sag monitoring points in Dongguan.First,this paper makes a comprehensive description and analysis of Dongguan power grid in Dongguan power grid,including the basic situation,the user load situation,Dongguan area industry in recent years,the main failure causes the two large range of Voltage Sag Analysis and simulation,analysis of Dongguan lightning distribution and pollutant distribution.Then,based on the research of voltage sag detection methods,developed including the detection time,pit personnel configuration and quantity,detection equipment,detection methods,process monitoring content of Dongguan substation voltage sag test scheme.According to the test plan,combined with the distribution of lightning flash in Dongguan area and the distribution of the polluted area,the paper analyzes the effective field voltage sag test of the substation which is more serious.Finally,based on the existing "PQMCS V4" power quality monitoring system in Dongguan power grid,the optimal configuration model of voltage sag monitoring point in Dongguan power grid is constructed.The optimal configuration model is used to optimize the voltage sag monitoring device of the whole network,and the observability of the voltage sag of the whole network can be realized by installing a minimum number of voltage sag monitoring devices.