Harmonic impedance scanning method and device for HVDC transmission system

A harmonic impedance and power transmission system technology, applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., can solve problems such as interference of measurement results and achieve accurate measurement results

Inactive Publication Date: 2019-12-24
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the embodiment of the present application provides a high-voltage direct current transmission system harmonic impedance scanning method and device to solve the technical problem in the prior art that the disturbance amplitude of the high-voltage direct current transmission system interferes with the measurement results

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  • Harmonic impedance scanning method and device for HVDC transmission system
  • Harmonic impedance scanning method and device for HVDC transmission system
  • Harmonic impedance scanning method and device for HVDC transmission system

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Embodiment Construction

[0013] The present application is described below based on examples, but the present application is not limited only to these examples. In the following detailed description of the application, some specific details are set forth in detail. The present application can be fully understood by those skilled in the art without the description of these detailed parts. To avoid obscuring the essence of the present application, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0014] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0015] Unless the context clearly requires, throughout the specification and claims, "comprises", "comprises" and similar words should be interpreted in an inclusive sense rather than an exclusive or exhaustive meaning; that is, "including but not limited to" meaning.

[0016] In...

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Abstract

The present application provides a method for harmonic impedance scanning of a high-voltage direct current transmission system, which comprises the following steps: harmonic current with a starting frequency and an initial amplitude is injected into the system; after the system enters into a steady state, the response value of the harmonic voltage and the harmonic current of the measuring point are extracted; the amplitude of the harmonic current is gradually increased until the amplitude of the harmonic current reaches the upper limit of the amplitude, and the harmonic impedance value under the said starting frequency is calculated according to the measuring result after each increasing of amplitude value; the frequency of the harmonic current is gradually changed according to the presetfrequency step until reaching the cut-off frequency, and the harmonic impedance value at other frequencies is continued to be measured according to the above-mentioned steps. Eliminating the interference of the disturbance amplitude on the measuring result in the system, the harmonic impedance of the high-voltage direct current transmission system is accurately measured.

Description

technical field [0001] The present application relates to the technical field of high voltage direct current transmission, in particular to a method and device for scanning harmonic impedance of a high voltage direct current transmission system. Background technique [0002] The HVDC transmission system is a strongly nonlinear system because it contains a large number of power electronic switches and complex control links. In the power system, the harmonic problems caused by various background harmonics and system disturbances applied to the HVDC transmission system will affect the normal operation of the system, and even cause serious consequences of system stability being destroyed. Determining the harmonic impedance of HVDC transmission system is the key to study the harmonic problems of HVDC system. [0003] Power system computer-aided design (PSCAD) is an electromagnetic transient simulation software widely used in power systems at present. PSCAD comes with a harmonic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/08
CPCG01R27/08
Inventor 马为民徐轩郭春林杨琳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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