Design of Reliability Improvement Method for Power Grid after UHV Connection under Power Factor Angle Prediction
After the ultra-high voltage is connected to the power grid,it is affected by fluctuations in the reliability of the transmission line,which can lead to problems of power flow overload and voltage exceeding limits.The power grid system is prone to malfunctions or power supply interruptions,seriously affecting the reliability of the power grid.Propose a method for controlling the overload voltage of the power grid after ultra-high voltage connection under power angle prediction to improve the reliability of the power grid.Analyze the power angle dependent characteristics of the power grid,and predict the changes in the voltage trajectory of the power grid after the ultra-high voltage is connected based on the analysis results of the power angle dependent characteristics;Design an active power flow controller to handle the problem of line overload based on trajectory change constraints;Design series and parallel inverters to achieve voltage coordination control based on different overload conditions of the line,supplement the shortcomings of the power flow controller,and improve the reliability of the power grid.The experimental results show that the probability of power grid loss under the proposed method is below 0.5,and the reliability optimization control time is between 28.6-40.4 seconds.This indicates that the proposed method has high reliability and practical application results in the grid structure under ultra-high voltage connection.
ultra high voltage connected to the power gridpower grid reliabilitytrack sensitivityactive power flow controllerDC layered access technology