Power locomotive test line balance power supply system

A technology for power supply systems and electric locomotives, which is applied to motor vehicles, electric vehicles, power lines, etc., and can solve problems such as normal operation of sensitive loads affecting power quality, excessive voltage fluctuations, and excessive three-phase unbalance.

CN108725217APending Publication Date: 2018-11-02ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2018-11-02

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Abstract

The invention discloses a power locomotive test line balance power supply system. The system comprises a transformer, a traction power supply system and a balance power supply device; the primary sideof the transformer comprises a first primary side winding and a second primary side winding which have a common connection point; the secondary side of the transformer comprises a traction power supply winding, a first set of output windings and a second set of output windings; the traction power supply winding is connected with the traction power supply system; the balance power supply device isconnected with a first secondary side winding in the first set of output windings, and a second secondary side winding of the second set of output windings and is used for achieving three-phase powerbalance through active connection and reactive power output. Therefore, through the balance power supply system of the scheme, high-voltage side three-phase real-time balance power supply can be achieved on the basis that the requirement for static adjustment and dynamic adjustment tests of a power locomotive / train set can be met, influences of negative sequences and voltage fluctuation on a downstream sensitive load of a power supply line are eliminated, and the safety and reliability of power supply are guaranteed.
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Description

technical field

[0001] The invention relates to the technical field of traction power supply, in particular to a balanced power supply system for an electric locomotive test line. Background technique

[0002] At present, after the manufacturing is completed, electric locomotives, EMUs, etc. need to undergo static adjustment / dynamic adjustment assessment tests, and the test line uses 27.5kV single-phase traction power supply. see figure 1 , the power supply system usually adopts AC three-phase 110kV (66kV in Northeast China) power input, and then converts it to 27.5kV single-phase output through a single-phase transformer to the traction power supply test line. However, since the traction loads of SS-type, HXD-type electric locomotives, and CRH-type high-speed EMUs are all high-power single-phase impact loads, when the locomotives go online for test operation, the three-phase unbalance at the point of common connection (PCC) will exceed the standard, Problems such as exces...

Examples

Embodiment Construction

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0035] The embodiment of the invention discloses a balanced power supply system for a test line of an electric locomotive to realize real-time balanced power supply of three phases on the high-voltage side of the line, and eliminate adverse effects of negative sequence and voltage fluctuation on other loads at common connection points.

[0036] see figure 2 , a balanced power supply system for an electric locomotive test line provided in an embodiment of the prese...