Electrified railway traction power supply system and method

Abstract

The application discloses an electrified railway traction power supply system and method. The system comprises a power supply unit, a hybrid energy storage unit, a traction power supply adjusting unitand a traction network unit. The power supply unit charges the hybrid energy storage unit, the hybrid energy storage unit provides power for the traction network unit to meet the power supply requirement of a locomotive, and the traction power supply adjusting unit is connected with the traction network unit to adjust the power balance between two power supply arms of the traction network unit. According to the electrified railway traction power supply system and method, the traction power supply adjusting unit is used for optimizing the capacity configuration of a traction transformer and anenergy storage converter; the traction transformer and the energy storage converter are prevented from being influenced by asymmetric loads when the discharge of the hybrid energy storage unit meetsthe energy consumption requirement of the locomotive / motor train unit; the utilization rates of the traction transformer and the energy storage converter are increased substantially;and the hybrid energy storage unit is used for isolating the direct electrical connection between the power grid and the traction power supply unit, so that the loose coupling between the power grid and the railway traction power supply network is realized.

Description

technical field [0001] The invention relates to an electrified railway traction power supply system and method, belonging to the field of railway networks. Background technique [0002] Electrified railway transportation is an important support to realize the integration of regional economy in China, the synergy of cross-regional economic development, and to solve the imbalance of social and economic development in different regions. However, the existing power grid and the traction power supply system are closely coupled and have great mutual influence, and there are many problems, as follows: [0003] (1) Adverse effects of the existing traction power supply system on the grid side [0004] (1) The electric locomotive is a high-power, asymmetrical, pulse-type single-phase load, which not only seriously affects the power quality (negative sequence, harmonics, power factor) of the 220kV / 110kV high-voltage grid, but also increases the peak-shaving pressure of the grid. [0...

AI Technical Summary

Problems solved by technology

However, the existing power grid and the traction power supply system are closely coupled and have great mutual influence, and there are many problems, as follows:

[0003] (1) Adverse effects of the existing traction power supply system on the grid side

[0004] (1) The electric locomotive is a high-power, asymmetrical, pulse-type single-phase load, which not only seriously affects the power quality (negative sequence, harmonics, power factor) of the 220kV / 110kV high-voltage power grid, but also increases the peak-shaving pressure of the power grid

[0005] (2) Under the existing electrified railway traction network and power grid structure, it is impossible to use other types of power sources other than the high-voltage power grid.

[0006] (3) Numerous electric phase-splitting equipment deployed along the traction network have huge investment and high operation and maintenance costs

[0007] (4) The supporting facilities of the high-voltage power grid for the construction of electrified railways are complicated, the project investment is large, the construction period is long, the land occupation is large, and the ecological impact is serious

[0008] (2) Adverse effects of the existing traction power supply system on the railway side

[0009] (1) The traction power supply system relies excessively on the strong high-voltage power grid, which makes it difficult and expensive to build electrified railways in areas with weak power grids (such as Sichuan-Tibet, Qinghai-Tibet, etc.), which seriously affects the promotion of my country's railway electrification technology

[0010] (2) The reliability, continuity and safety of the operation of the existing electric railway traction system depend entirely on the power grid system. Once the power grid fails, it will have a significant negative impact on the operation of the electrified railway

[0011] (3) The traction transformer has a large capacity, but the utilization rate is low, and the capacity maintenance and operation and maintenance costs are high

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