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Device and method of testing short-circuit current of DC power grid

A short-circuit current and DC power grid technology, which is applied in the direction of testing circuits, fault locations, and testing dielectric strength, can solve problems affecting the safe operation of DC transmission systems, and achieve the effects of ensuring safe operation, high flexibility, and improving voltage stability

Active Publication Date: 2019-09-10
XIAN XJ POWER ELECTRONICS TECH +5
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 solv

Method used

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  • Device and method of testing short-circuit current of DC power grid
  • Device and method of testing 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 present invention relates to a device and a method of testing short-circuit current of a DC power grid, which belongs to the technical field of flexible DC transmission and DC distribution network. The device comprises a transformer and a rectifier. An input end of the transformer is used for connecting a power source and an output end for connecting the rectifier. An output end of the rectifier is connected to an energy storage capacitor. Two ends of the energy storage capacitor are connected in parallel to a DC converter, which is used for providing the short-circuit to the DC power gridby adopting carrier phase-shifted PWM modulation. The device of testing the short-circuit current of the DC power grid in the present invention, before test of the short-circuit current, charges theenergy storage capacitor via the transformer and the rectifier using the power source; and when charging the energy storage capacitor is finished, provides the short-circuit current to the DC power grid using the carrier phase-shifted PWM modulation with the DC converter. The present invention, without causing an impact to the DC power grid, can improve voltage stability of the DC transmission system, thus further ensuring safe operation of the DC 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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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
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