Method for optimizing electric energy mass and energy utilization efficiency of overhead lines

Abstract

The invention discloses a method for optimizing the electric energy mass and energy utilization efficiency of overhead lines. The method is characterized in that an AC-DC-AC device (RPC) with a back-to-back structure is adopted in the overhead lines and is used for connecting different power supply arms, and the RPC supplies electric energy or recovers braking energy when a vehicle is pulled or braked. According to the method, the power needed to be supplied or absorbed by the RPC at each phase change node is calculated through a cooperative optimization algorithm by collecting the traction orbraking power in each phase change arm in the same overhead line, the three-phase imbalance of the overhead lines is inhibited, and the energy utilization rate is improved.

Description

Technical field [0001] The invention relates to the field of high-speed railway catenary, in particular to a method for utilizing electric power quality and efficiency of the catenary. Background technique [0002] With the vigorous development of the railway industry, electric traction power supply has become the most important power supply method for railways. Electric traction adopts single-phase AC power frequency power supply system, and the local power supply network reduces the voltage to supply power to the vehicles. However, because the vehicle contact network adopts one-way Power supply, therefore, causes the three-phase imbalance of the power grid, which poses certain safety risks to the safe operation of the power grid. Moreover, a large amount of braking energy will be generated when the vehicle is braking. If the braking energy is directly fed back to the power grid, it may increase the three-phase imbalance of the power grid, and a large number of harmonics will af...

AI Technical Summary

Problems solved by technology

[0002] With the vigorous development of the railway industry, electric traction power supply has nearly become the most important power supply method for railways. Electric traction adopts a single-phase AC power frequency power supply system, and the local power supply network is stepped down to supply power to vehicles. Therefore, the three-phase unbalance of the power grid will be caused, which will cause certain safety hazards to the safe operation of the power grid.

Moreover, a large amount of braking energy will be generated when the vehicle brakes. If the braking energy is directly fed back to the grid, it may increase the three-phase unbalance of the grid, and a large number of harmonics will affect the power quality. At present, when the vehicle brakes Most of the braking energy is consumed by equipment such as braking resistors, which seriously affects the utilization rate of energy, and does not meet the current requirements for energy conservation and environmental protection. Therefore, the research on regenerative braking energy recovery has become a research hotspot in the field of rail transit. Energy recovery rate The improvement will make the vehicle have better driving economy, and will reduce the three-phase unbalance on the grid side, and will have better security for the operation of the grid side

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