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A Harmonic Impedance Measurement System and Method for a Converter Transformer

A technology for converter transformers and harmonic impedance, applied in the field of harmonic impedance measurement systems, can solve problems such as large errors, inaccurate flow through transformers, and inaccurate measurement methods, so as to reduce errors, provide accuracy, and reduce Effect of Harmonic Current

Active Publication Date: 2021-06-08
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the influence of stray capacitance needs to be considered in the high frequency range. At this time, the current flowing through the resistor becomes smaller, and the current will flow through the stray capacitance to ground, and the current flowing through the transformer cannot be accurately obtained, so in the high frequency range This measurement method is inaccurate and has a large error

Method used

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  • A Harmonic Impedance Measurement System and Method for a Converter Transformer

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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] see figure 1 , is a structural schematic diagram of a harmonic impedance measurement system of a converter transformer provided by an embodiment of the present invention, including a signal generator 101, a power amplifier 102, a measuring resistor 103, a converter transformer 104, a data acquisition unit 105 and a computer processing Unit 106; where,

[0036] The output end of the signal generator 101 is electrically connected to the input end of the power...

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Abstract

The invention discloses a harmonic impedance measurement system and method of a converter transformer, comprising a signal generator, a power amplifier, a measuring resistance, a converter transformer, a data acquisition unit and a computer processing unit; wherein, the output of the signal generator end is electrically connected to the input end of the power amplifier; one end of the measurement resistor is electrically connected to the output end of the power amplifier, and the other end is electrically connected to the input end of the converter transformer; the first end of the data acquisition unit An input end is electrically connected to the output end of the power amplifier, and a second input end of the data acquisition unit is electrically connected to the input end of the converter transformer; the output end of the data acquisition unit is electrically connected to the computer processing unit The input terminal is electrically connected, and the harmonic impedance of the converter transformer can be measured in real time, which can effectively improve the accuracy of the harmonic impedance measurement result and reduce the error.

Description

technical field [0001] The invention relates to the technical field of transformer measurement, in particular to a harmonic impedance measurement system and method of a converter transformer. Background technique [0002] With the progress of the times, the role of power electronic devices in the process of power conversion and grid connection is becoming more and more important, and the scope of application is becoming wider and wider. But at the same time, the use of these nonlinear devices has brought more serious power quality problems such as harmonic distortion to the grid. In addition, the rapid development of high-voltage direct current transmission has led to more prominent harmonic problems in power systems. In particular, the harmonic components of the converter transformer in the above system are relatively serious, and various characteristic harmonic currents and non-characteristic harmonic currents generated by the converter are fed through the valve side wind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/08G01R25/00
CPCG01R25/00G01R27/08
Inventor 雷园园张巍鲍连伟王帅兵罗炜
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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