Negative-sequence governing device and method for test wire of motor train unit

A technology for test lines and EMUs, which is used in flexible AC transmission systems, reduction of asymmetry in multi-phase networks, and reactive power adjustment/elimination/compensation to ensure power supply quality and eliminate negative sequence effects.

Active Publication Date: 2014-05-07
ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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  • Abstract
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Problems solved by technology

[0004] Therefore, at present, there is no technical solution to fundamentally solve the negative sequence problem of the EMU test line in China.

Method used

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  • Negative-sequence governing device and method for test wire of motor train unit
  • Negative-sequence governing device and method for test wire of motor train unit
  • Negative-sequence governing device and method for test wire of motor train unit

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specific Embodiment approach

[0059] A specific embodiment of a negative sequence control method for an EMU test line, the method comprises the following steps:

[0060] S101: Installing a first thyristor-controlled reactor between phase A and phase B of the three-phase grid bus;

[0061] S102: setting the second thyristor control reactor 4 and the thyristor switching capacitor combination 5 between phase B and phase C of the three-phase grid bus;

[0062] S103: The control device 3 detects the A-phase or C-phase current of the primary side of the transformer in real time, so that the lagging inductive reactive current I output by the adjustable reactor L =I Am =I Cm ; Make the leading capacitive reactive current I output by the adjustable capacitor 2 C =I Am =I Cm ; where, I Am is the current of A-phase line on the 10KV side of the three-phase power grid on the primary side of the traction transformer; I Cm is the C-phase line current on the 10KV side of the three-phase power grid on the primary side...

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Abstract

The invention discloses a negative-sequence governing device and method for a test wire of a motor train unit. The governing device comprises an adjustable reactor, an adjustable capacitor and a control device, wherein both the adjustable reactor and the adjustable capacitor are connected with a three-phase power grid bus; the adjustable reactor is a thyristor control reactor for continuously adjusting sensitive reactive output; in the adjustable capacitor, not less than two groups of thyristor switching capacitors are connected in parallel with a thyristor control reactor; the control device is connected with the three-phase power grid bus to detect the phase current of the three-phase power grid bus; and the control device is connected with the adjustable reactor and the adjustable capacitor to control the adjustable reactor to output sensitive reactive current and control the adjustable capacitor to output capacitive reactive current. By adopting the device and the method described in the invention, the power supply quality can be ensured effectively, the negative-sequence influence is eliminated, and the power supply capability of a power system is brought into full play.

Description

technical field [0001] The invention relates to the field of electric power system power supply, in particular to a negative-sequence treatment device and method for a power supply system of an EMU test line. Background technique [0002] With the rapid development of national high-speed railways, the demand for domestic EMUs is increasing. In order to meet the static and dynamic commissioning tests of the new generation of EMUs, and meet the needs of large-capacity tests such as the rolling test bench of the National Engineering Laboratory and the operation test of the high-speed EMUs on the loop line, it is necessary to establish an AC traction substation. [0003] Domestic trunk high-speed railways all use 220kV three-phase power grids to supply locomotive traction loads through transformer step-down, and cycle commutation in power supply intervals reduces negative-sequence effects. In addition, the capacity of power grids is increasing day by day, so no balance compensat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18H02J3/26
CPCY02E40/50Y02E40/12Y02E40/10
Inventor 周方圆黄燕艳王卫安沈辉王才孝周靖蒋家久邱文俊邓建华龙礼兰朱建波文韬李幼保吴选宝胡前吴明水
Owner ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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