A Balanced Power Supply System for Electric Locomotive Test Line

Abstract

The invention discloses an electric locomotive test wire balanced power supply system which comprises a control unit, a locomotive traction power supply subsystem and a power balanced subsystem. The locomotive traction power supply subsystem is used for converting single phase wire voltage into electric locomotive rated traction power supply voltage; the power balanced subsystem comprises a three-phase V / v wiring transformer and a power balancing device, the primary side of the three-phase V / v wiring transformer is connected with three phases in a three-phase power supply grid of an electric locomotive test wire, the power balancing device comprises two converter units and a direct current capacitor, a first current detection piece is arranged in a primary side loop of a single-phase boosting transformer, the control unit is used for controlling active power facility between the two converter units and each inactive power output according to a current signal of the primary side loop of the single-phase boosting transformer so as to achieve three-phase power grid power balance of the electric locomotive test wire. The power supply system has the advantages of ensuring power supply three-phase balance, eliminating negative sequence influences and the like.

Description

technical field [0001] The invention mainly relates to the technical field of electric locomotives, in particular to a balanced power supply system for an electric locomotive test line. Background technique [0002] As the test line for static adjustment and dynamic adjustment assessment tests of electric locomotives, it usually uses the ubiquitous AC three-phase 10kV power supply, and outputs single-phase 25kV voltage to power electric locomotives through transformers. Since the capacity of the 10kV system is relatively small, it is supplied to SS type, HXD When large-power single-phase unbalanced loads such as large-scale electric locomotives and CRH-type high-speed EMUs are used, it is easy to trip the upper transformer caused by unbalanced load or single-phase overload, which will affect the safe and reliable operation of the power supply system. In order to ensure the normal operation of the electric locomotive's factory dynamic adjustment test, it is often only a tempo...

AI Technical Summary

Problems solved by technology

[0002] As the test line for static adjustment and dynamic adjustment assessment tests of electric locomotives, it usually uses the ubiquitous AC three-phase 10kV power supply, and outputs single-phase 25kV voltage to power electric locomotives through transformers. Since the capacity of the 10kV system is relatively small, it is supplied to SS type, HXD When large-power single-phase unbalanced loads such as large-scale electric locomotives and CRH-type high-speed EMUs are used, it is easy to trip the upper transformer caused by unbalanced load or single-phase overload, which will affect the safe and reliable operation of the power supply system.

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