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Flexible direct-current transmission converter impedance analysis method and device and storage medium

A flexible DC transmission and impedance analysis technology, applied in power transmission AC network, reducing/preventing power oscillation, single-network parallel feeding arrangement, etc., can solve the problem of ignoring the delay effect of signal processing, etc.

Active Publication Date: 2020-02-04
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Embodiments of the present invention provide a flexible direct current transmission converter impedance analysis method, device, and storage medium, which can effectively solve the problem that the existing technology ignores the delay effect of power electronic controllers in signal processing in actual engineering, and can effectively improve the system The accuracy of stability analysis, and can effectively reduce the error

Method used

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  • Flexible direct-current transmission converter impedance analysis method and device and storage medium
  • Flexible direct-current transmission converter impedance analysis method and device and storage medium
  • Flexible direct-current transmission converter impedance analysis method and device and storage medium

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Embodiment 1

[0062] See figure 1 , Is a schematic flowchart of a method for impedance analysis of a flexible DC transmission converter provided by the first embodiment of the present invention, including steps S101 to S104.

[0063] S101. Obtain a grid voltage signal and a three-phase voltage and current signal in the grid.

[0064] S102. Input the grid voltage signal and the three-phase voltage and current signal to a preset flexible-to-DC converter control loop model to obtain a three-phase voltage target signal; wherein, the flexible-to-DC converter control loop model includes Phase-locked loop control model, rotating coordinate system model, active power control model, reactive power control model and current inner loop control model.

[0065] In an alternative embodiment, see figure 2 , Is a schematic diagram of the data processing flow of the control loop model of the flexible converter provided in the first embodiment of the present invention, including step S201 to step S205.

[0066] S2...

Embodiment 2

[0109] See image 3 It is a schematic structural diagram of an impedance analysis device for a flexible DC transmission converter provided in the second embodiment of the present invention, including:

[0110] The signal acquisition module 301 is used to acquire grid voltage signals and three-phase voltage and current signals in the grid;

[0111] The control processing module 302 is configured to input the grid voltage signal and the three-phase voltage and current signal into a preset flexible-to-DC converter control loop model to obtain a three-phase voltage target signal; wherein, the flexible-to-DC converter The controller control loop model includes phase-locked loop control model, rotating coordinate system model, active power control model, reactive power control model and current inner loop control model;

[0112] The equivalent delay control module 303 is configured to input the three-phase voltage target signal into a preset equivalent delay control model to obtain an equ...

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Abstract

The invention discloses a flexible direct-current transmission converter impedance analysis method and device and a storage medium. The method comprises the steps that a network voltage signal and three-phase voltage and current signals in a power grid are acquired; the network voltage signal and the three-phase voltage and current signals are input into a preset flexible direct-current convertercontrol circuit model, and three-phase voltage target signals are obtained, wherein the flexible direct-current converter control circuit model comprises a phase-locked loop control model, a rotational coordinate system model, an active power control model, a reactive power control model and a current inner loop control model; the three-phase voltage target signals are input into a preset equivalent delay control model, and equivalent delay three-phase voltage target signals are obtained; and according to the equivalent delay three-phase voltage target signals, an impedance model of a flexibledirect-current transmission converter is obtained. Therefore, the problem that in the prior art, the delay effect of a power electronic controller during signal processing in practical engineering isignored can be effectively solved, the accuracy of system stability analysis can be effectively improved, and an error can be effectively lowered.

Description

Technical field [0001] The present invention relates to the technical field of power system stability analysis, in particular to a method, device and storage medium for impedance analysis of a flexible direct current transmission converter. Background technique [0002] Compared with the traditional DC transmission system, the flexible DC transmission system based on the flexible DC converter has the advantages of small harmonic content, small footprint, and low maintenance cost. Therefore, the flexible DC transmission system is widely used in the process of large-scale new energy grid connection. However, a large number of reports have pointed out that there is a risk of oscillation when new energy is connected to the grid through the flexible DC transmission system. Oscillations have been found in flexible DC transmission projects at home and abroad, which directly affect the normal operation of the power grid, and even cause large-scale wind farms to go offline. , Equipment d...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/36H02J3/48H02J3/50
CPCH02J3/24H02J3/36H02J3/48H02J3/50Y02E60/60
Inventor 张帆洪潮袁豪张野杨健李俊杰孙鹏伟
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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