Evaluation Of Reactive Power Compensation Strategy For High Speed Railway 10kV Cable Line

With the rapid development of high-speed railway in our country,the degree of electrification of the railway has been rapidly popularized,and the proportion of the whole power cable line is getting higher and higher.However,in the actual operation,it is found that the capacitance current of the whole cable through line is larger,and the traditional overhead line can not meet the requirements.In this paper,the equivalent model and the basic parameters of the cable are introduced,and then the modeling method of the power cable is given.On the basis of the typical model system,the capacitance effect simulation is carried out,and the capacitance effect under no-load and load is compared.This paper discusses the evaluation of the fixed reactive power compensation capacity of the power line.Power supply line for no-load running,at the end of the line voltage rise is very obvious,the power factor of power supply side and line side is also very low,so the need to set the appropriate fixed reactive power compensation,in order to meet the power supply line under the most unfavorable conditions of normal operation.With three power supply modes,we have a try of the 114kvar and 76kvar fixed reactive power compensation device.The simulation results show that the normal operation mode,the fixed investment compensation scheme of 114kvar is better at the end of the line voltage rise inhibition effect than the fixed compensation input scheme based on 76kvar,the power factor improvement is greater.This paper discusses the dynamic reactive power compensation scheme.In the case of fixed reactive power compensation capacity,power factor may be the power supply side is still very low,and needs the dynamic reactive power compensation in distribution,dynamic compensation capacity switching varies with the change of load.The maximum load condition,because the line appears emotional,while the power supply side power factor and the voltage at the end of the line can not meet the requirements,the proposed fixed compensation to reduce the line,so that the supply side power factor and the voltage at the end of the line to meet the requirements.At the same time,through the comparative analysis,the three power supply modes,dynamic compensation after the voltage regulator or in front of regulator,has almost no effect on the power supply side power factor.The dynamic compensation after the regulator,although the dynamic compensation capacity is reduced,but compared to in front of regulator at the end of the line,the voltage drop is more serious,therefore,should be connected with dynamic compensation in front of regulator.In this paper,through the simulation analysis,we get the reactive power compensation scheme of the whole cable line.By using fixed reactive power compensation and dynamic reactive power compensation,the investment can be saved and the technical scheme and maintenance is relatively simple.