Research On Optimization Of Continuous Co-phase Power Supply Technology Scheme

The traditional traction power supply method requires a set of electrical phase separation in the substation and the sub-division,which causes a series of problems when the locomotive passes.At the same time,due to the increasing speed and heavy load of the electrified railway,the entire power supply system Power quality problems such as negative sequence and harmonics are gradually emerging.The combined in-phase power supply technology effectively solves these problems.Because of the decoupling of the power supply device and the compensation device,this technology not only solves the power quality problem well,but also minimizes the capacity of the compensation device.The long-distance power supply technology can reduce the number of substations,which not only saves the construction cost,but also saves the extra power investment cost.However,due to the high price of the cable,it is particularly important to study the power supply scheme.This paper first introduces the structure of the in-phase through-supply and the measures to solve the equilibrium current,and the mathematical analysis of the rail potential and traction network voltage for long-distance power supply and the simulation analysis after constructing the simulink model,indicating the electrical under different long-distance power supply modes.characteristic.Then the continuous power flow calculation model with long-distance power supply in the same phase is established,and the train is calculated according to a certain line.The calculated train load process data is brought into the continuous power flow calculation model to analyze the active loss and rail potential under different power supply forms.The minimum locomotive voltage change law.Then,the multi-objective optimization algorithm is studied,and the accuracy of the multi-objective optimization algorithm is tested.At the same time,the optimization target and constraint model for the power supply system are designed.The multi-objective optimization is carried out for different power supply modes to obtain different optimization schemes..Finally,calculate the sum of costs according to different schemes,select the final design scheme of each power supply mode based on the minimum total cost of the longest year,and compare the economics of each scheme,and explain the superiority of the in-phase through power supply scheme and the cable power supply scheme.