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Steady-state test method and system for transient voltage overshoot value of direct-current voltage divider

A technology of DC voltage divider and transient voltage, applied in the direction of voltage divider, measuring current/voltage, instrument, etc., can solve the problem that the overshoot value of transient voltage cannot be measured, and achieve easy implementation of test work and high calculation accuracy High, the effect of avoiding the error of the result

Active Publication Date: 2020-10-09
STATE GRID JIANGSU ELECTRIC POWER CO LTD MARKETING SERVICE CENT +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]The object of the present invention is to provide a steady-state test method and system for the transient voltage overshoot value of a DC voltage divider to solve the problem of DC electronic problems in the prior art. The technical problem that the transient test of the voltage transformer cannot measure the transient voltage overshoot value of the step process

Method used

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  • Steady-state test method and system for transient voltage overshoot value of direct-current voltage divider
  • Steady-state test method and system for transient voltage overshoot value of direct-current voltage divider
  • Steady-state test method and system for transient voltage overshoot value of direct-current voltage divider

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Embodiment 1

[0030] Such as figure 1 As shown, a steady-state test method for the transient voltage overshoot value of the DC voltage divider, respectively samples the AC voltage signal of the standard voltage divider and the DC voltage divider under the test voltage source, and obtains the standard voltage divider sample sequence and DC voltage divider sampling sequence, and obtain the AC component frequency of the standard voltage divider and the AC component frequency of the DC voltage divider by the standard voltage divider sampling sequence and the DC voltage divider sampling sequence respectively; The sampling sequence and the sampling sequence of the DC voltage divider are processed with Hanning window, and Fourier transform is adopted to obtain the AC signal amplitude of the standard voltage divider and the AC signal amplitude of the DC voltage divider; take the setting under the test voltage source The length of the DC voltage signal data, using generalized polynomial fitting to o...

Embodiment 2

[0054] Based on the method described in Embodiment 1, this embodiment provides a steady-state test system for the transient voltage overshoot value of a DC voltage divider, such as image 3 As shown, including DC and high-frequency voltage generators, DC and high-frequency voltage generators emit high-frequency superimposed AC-DC test voltage sources, connected in parallel to standard voltage dividers and DC voltage dividers, and DC electronic transformer testers The voltage signals of the standard voltage divider and the DC voltage divider are respectively sampled, and the transient voltage overshoot value of the DC voltage divider is calculated.

[0055] In this embodiment, the DC and high-frequency voltage generators are implemented using power electronics technology. The decay time constant of the DC voltage divider of the DC electronic voltage transformer is generally 100us. In order to improve the calculation accuracy, the high-frequency voltage signal uses 20kHz, thereby...

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Abstract

The invention discloses a steady-state test method and system for a transient voltage overshoot value of a direct-current voltage divider, belongs to the technical field of direct-current voltage divider test, and aims to solve the technical problem that the transient voltage overshoot value of the step process cannot be tested in a transient test of a direct-current electronic voltage transformerin the prior art. AC voltage signals of the standard voltage divider and the DC voltage divider under the test voltage source are sampled respectively to obtain a standard voltage divider sampling sequence and a DC voltage divider sampling sequence; the AC signal amplitude of the standard voltage divider and the AC signal amplitude of the DC voltage divider are obtained; a direct current signal amplitude of the standard voltage divider and a direct current signal amplitude of the direct current voltage divider are obtained; a high-frequency voltage division ratio is calculated; a direct-current voltage division ratio is calculated; and the transient voltage overshoot value of the direct-current voltage divider is calculated according to the high-frequency voltage division ratio and the direct-current voltage division ratio. The direct-current voltage divider is directly tested to replace the whole direct-current electronic voltage transformer so that the test work is easy to realize,and the calculation precision is higher.

Description

technical field [0001] The invention belongs to the technical field of DC voltage divider testing, and in particular relates to a steady-state testing method and system for transient voltage overshoot values ​​of DC voltage dividers. Background technique [0002] With the rapid development of high-power fully-controlled power electronic devices and the continuous improvement of the manufacturing level of DC power grids, voltage source DC transmission (VSC-HVDC) based on insulated gate bipolar thyristors (IGBTs) has attracted more and more attention. And applications, will become the most important transmission method in the DC grid. DC electronic transformer is one of the key equipment of HVDC transmission project, and its transient performance is directly related to the operation safety of UHVDC transmission project. In recent years, there have been many failures of DC transmission project blocking caused by the long response time of the transient step of the DC electronic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/175G01R15/06
CPCG01R19/175G01R15/06Y02E60/60
Inventor 徐敏锐黄奇峰卢树峰王忠东杨世海陈刚李志新汤汉松陆子刚罗强陈文广周东顶吴桥郭家豪陈飞尧赣东龚文
Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD MARKETING SERVICE CENT
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