V-v wiring same-phase power supply and transformation structure

Abstract

The invention discloses a V-v wiring same-phase power supply and transformation structure. A V-v connection group is formed by a primary-side winding of a high-voltage-matched transformer and a primary-side winding of a traction transformer, the phase angle of the line voltage of the primary-side winding of the high-voltage-matched transformer is 120 degrees ahead of the phase angle of the line voltage of the traction transformer, a secondary-side winding of the high-voltage-matched transformer is connected with the input end of an ADA converter, and the outlet end of the ADA converter is connected with a primary side of a traction matching transformer. The voltage amplitude and the voltage phase of the secondary-side winding of the traction transformer are the same as those of a secondary side of the traction matching transformer respectively, and both the traction transformer and the traction matching transformer are connected with a traction bus. Due to the V-v wiring same-phase power supply and transformation structure, the capacity and the proportion of the ADA converter in a CPD can be reduced, construction cost can be reduced, and the optimal configuration of traction and power supply resources can be further achieved. The V-v wiring same-phase power supply and transformation structure is good in energy saving effect, and is particularly suitable for same-phase improvement of V-v wiring or V-x wiring traction substations used in high-speed railways and passenger transport lines currently and widely.

Description

technical field [0001] The invention relates to the field of power supply for AC electrified railways, in particular to a Vv connection in-phase power supply and transformation structure. Background technique [0002] Electrified railways generally adopt the single-phase power frequency AC system powered by the public power system. In order to make the single-phase traction load be distributed as balanced as possible in the three-phase power system, the electrified railway often adopts the scheme of rotating phase sequence and separate phase and partition power supply. The adjacent power supply areas at the phase-splitting partitions are divided by phase-splitting insulators to form electrical split phases, also known as phase splits. In order to prevent electric locomotives from burning out catenary suspension components due to arcing through electric split-phase emission, and even causing phase-to-phase short-circuit and other accidents, as the train speed continues to inc...

AI Technical Summary

Problems solved by technology

[0003] High-speed and heavy-duty railways have widely used high-power AC-DC electric locomotives or EMUs based on full-control devices such as IGBTs and IGCTs. The core is traction converters with multiple sets of four-quadrant PWM control and multiple control. The content is small, and the power factor is close to 1, but the traction power of AC-DC electric locomotives or EMUs is large. For example, the rated power of single-vehicle high-speed EMUs running in large formations can reach 25MW (equivalent to 5 trains on ordinary speed railways). The increasingly serious power quality problems caused by power single-phase loads on the three-phase grid, mainly caused by three-phase voltage unbalance (negative sequence), must be paid attention to

Images