Frequency sweeping method and device for harmonic impedance of flexible direct current power transmission system

A power transmission system, flexible DC technology, applied in the measurement of resistance/reactance/impedance, measurement device, measurement of electrical variables, etc., can solve the problem of slow frequency sweeping speed, improve frequency sweeping speed, improve frequency sweeping efficiency, save sweeping frequency, etc. frequency time effect

Pending Publication Date: 2021-12-10
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

If the disturbance signals of different frequency components are injected into the flexible DC transmission system separately, the frequency sweep speed will be slow

Method used

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  • Frequency sweeping method and device for harmonic impedance of flexible direct current power transmission system
  • Frequency sweeping method and device for harmonic impedance of flexible direct current power transmission system
  • Frequency sweeping method and device for harmonic impedance of flexible direct current power transmission system

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Embodiment Construction

[0048] The application will be described in further detail below in conjunction with the accompanying drawings.

[0049] The embodiment of the present application provides a frequency sweeping method for the harmonic impedance of the flexible direct current transmission system, the specific flow chart is as follows figure 1 As shown, the specific process is as follows:

[0050] S101: Input the operating conditions of the flexible direct current transmission system into the pre-built frequency sweep model to simulate the flexible direct current transmission system, and obtain the simulated measured voltage and simulated measured current of the grid-connected point of the flexible direct current transmission system (ie, the simulation result);

[0051] S102: Determine the harmonic impedance of the flexible direct current transmission system based on the simulated measured voltage and simulated measured current of the grid-connected point of the flexible direct current transmissi...

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Abstract

The invention provides a frequency sweeping method and device for harmonic impedance of a flexible direct current power transmission system. The method comprises the steps of inputting an operation condition of the flexible direct current power transmission system into a frequency sweeping model, and carrying out the simulation of the flexible direct current power transmission system, and obtaining a simulation measurement voltage and a simulation measurement current of a grid-connected point of the flexible direct current power transmission system, and determining the harmonic impedance of theflexible direct current power transmission system. The frequency sweeping model comprises a harmonic voltage source module, and the harmonic voltage source module is used for providing harmonic voltages with different frequencies at equal intervals for the flexible direct current power transmission system. Compared with single harmonic source injection frequency sweeping, the technical scheme provided by the invention can greatly improve the frequency sweeping efficiency of the harmonic impedance of the flexible direct current power transmission system, save the frequency sweeping time and ensure the precision of the frequency sweeping result, and the frequency sweeping model utilizes the uniformly-spaced harmonic voltage source and is convenient to implement.

Description

technical field [0001] The present application relates to the technical field of flexible direct current transmission, in particular to a frequency sweeping method and device for harmonic impedance of a flexible direct current transmission system. Background technique [0002] The flexible direct current transmission system based on the voltage source converter can realize the independent control of active power and reactive power, and can realize the power supply to the passive network at the same time, especially suitable for new energy access, long-distance load power transmission, urban power supply, etc. field, but its grid-connected operation stability has always been an important topic of concern to the power grid. [0003] The stability of the HVDC system is strongly related to the impedance frequency characteristics of the HVDC system. In order to study the harmonic impedance frequency characteristics of the HVDC system, it is first necessary to know the point of co...

Claims

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Application Information

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IPC IPC(8): G01R27/08
CPCG01R27/08
Inventor 谷怀广周家培寇龙泽朱琳刘栋阳岳希
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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