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A test device and method for short-circuit current of DC power grid

A technology of DC power grid and short-circuit current, which can be used in testing circuits, fault locations, testing dielectric strength, etc., and can solve problems affecting the safe operation of DC transmission systems.

Active Publication Date: 2022-03-22
XIAN XJ POWER ELECTRONICS TECH +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a DC power grid short-circuit current test device and method, which is used to solve the problem that the existing DC power grid short-circuit current test device affects the safe operation of the DC power transmission system

Method used

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  • A test device and method for short-circuit current of DC power grid
  • A test device and method for short-circuit current of DC power grid

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Embodiment Construction

[0016] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0017] Such as figure 2 The shown short-circuit current test device of the DC grid includes a voltage regulator TY1, a rectifier bridge DR1, a supercapacitor C1 and a DC / DC (direct current converter). Among them, the input terminal of the voltage regulator TY1 is used to connect the AC380V power supply, the output terminal is connected to the rectifier bridge DR1, the output terminal of the rectifier bridge DR1 is connected to the supercapacitor C1, the two ends of the supercapacitor C1 are connected in parallel with DC / DC, and the DC / DC is used for PWM modulation with carrier phase shift is used to provide short-circuit current to the DC grid.

[0018] The DC / DC in this embodiment is an interleaved parallel Buck converter, including n Buck units, and each Buck unit includes fully controlled switching devices (Q1, Q2, ..., Qn), diodes (D1,...

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Abstract

The invention relates to a short-circuit current test device and method of a DC power grid, belonging to the technical field of flexible DC transmission and DC distribution network. The device includes a transformer and a rectifier. There is an energy storage capacitor, and a DC converter is connected in parallel at both ends of the energy storage capacitor, and the DC converter is used to provide short-circuit current to the DC power grid by using PWM modulation of carrier phase shift. In the DC power grid short-circuit current test device of the present invention, before the short-circuit current test, the power supply is used to charge the energy storage capacitor through the transformer and the rectifier. The net provides short-circuit current. The invention will not cause impact on the direct current power grid, can improve the voltage stability of the direct current transmission system, and then ensure the safe operation of the direct current transmission system.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current transmission and direct current distribution network, and in particular relates to a short-circuit current test device and method of a direct current power grid. Background technique [0002] With the increase of direct current transmission projects, the domestic progress in the field of direct current transmission technology is rapid, and direct current equipment has been more widely used in actual direct current transmission projects. This application has the characteristics of high voltage, large current and large capacity, while direct current The electrical performance of the equipment will directly affect the reliability and safety of the DC transmission system. The short-circuit current test is to verify whether the DC equipment can withstand the maximum current caused by the short-circuit fault, and the short-circuit current in the DC system can reach tens of kA or even high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R31/14
CPCG01R31/086G01R31/14
Inventor 柳龙安昱辛德锋杜斌石松牛化鹏盛万兴李蕊吴鸣孙丽敬李彬彬
Owner XIAN XJ POWER ELECTRONICS TECH