Adjustable traction transformer for flexible through bilateral power supply system and equalizing current suppression method

Abstract

According to an adjustable traction transformer for a flexible through bilateral power supply system and an equalizing current suppression method, the voltage amplitude and the voltage phase are adjustable, and the zero-load voltage amplitude and voltage amplitude difference and phase difference of open loop points of no-load buses of two adjacent traction stations tend to be zero. Three windings in the high-voltage side of the first adjustable transformer are provided with first adjustable taps, windings on the low-voltage side of the first adjustable transformer are provided with second adjustable taps, and the voltage amplitude and the voltage phase angle of the first adjustable transformer are adjusted through the first adjustable taps and the second adjustable taps; three windings in the high-voltage side of the second adjustable transformer are provided with third adjustable taps, windings on the low-voltage side of the second adjustable transformer are provided with fourth adjustable taps, and the voltage amplitude and the voltage phase angle of the second adjustable transformer are adjusted through the third adjustable taps and the fourth adjustable taps; and the voltage amplitude and phase of the traction transformer are adjusted by adjusting the first adjustable tap, the second adjustable tap, the third adjustable tap and the fourth adjustable tap.

Description

technical field [0001] The invention relates to traction power supply technology for electrified railways, in particular to an adjustable traction transformer and a balanced current suppression method for a flexible through-bilateral power supply system. Background technique [0002] The flexible penetrating bilateral power supply system is a power supply method that can improve traction power supply capacity, reduce electrical phase separation between traction substations, and is conducive to energy saving and load balance between substations. It has outstanding technical and economic indicators, but it also has inherent shortcomings. That is, due to the influence of system power flow and network structure between adjacent traction substations, there will be a certain phase angle and amplitude difference in the voltage of the same-phase low-voltage bus of adjacent traction substations, which will cause The power flow of the system ring network changes. This change will form...

AI Technical Summary

Problems solved by technology

[0002] The flexible penetrating bilateral power supply system is a power supply method that can improve traction power supply capacity, reduce electrical phase separation between traction substations, and is conducive to energy saving and load balance between substations. It has outstanding technical and economic indicators, but it also has inherent shortcomings. That is, due to the influence of system power flow and network structure between adjacent traction substations, there will be a certain phase angle and amplitude difference in the voltage of the same-phase low-voltage bus in adjacent traction substations, which will cause The power flow of the system ring network changes. This change will form a balanced current, which will affect the correct measurement of the traction load. power oscillation

Images