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Subsynchronous oscillation analysis method and device based on impedance network model

A technology of subsynchronous oscillation and impedance network, which is applied in special data processing applications, instruments, electrical digital data processing, etc., to achieve the effect of simple and efficient judgment

Active Publication Date: 2016-10-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Although these simplified operations are beneficial to the establishment of the system impedance model, they bring analysis errors that cannot be ignored

Method used

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  • Subsynchronous oscillation analysis method and device based on impedance network model
  • Subsynchronous oscillation analysis method and device based on impedance network model
  • Subsynchronous oscillation analysis method and device based on impedance network model

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Embodiment Construction

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0030] The present invention proposes a subsynchronous oscillation analysis method and device based on an impedance network model for a power electronic power system, that is, the converter device is equivalent to an input-output impedance model, and then combined with the system to form an impedance network, and the impedance network Gradually aggregated into an impedance, by analyzing the frequency characteristics of the impedance, the determination of the SSO stability characteristics of the system is realized.

[0031] The me...

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Abstract

The invention discloses a subsynchronous oscillation analysis method and device based on an impedance network model, wherein the method comprises the following steps of obtaining an impedance model; building the impedance network model by an element interconnection method according to the impedance network; aggregating the impedance network model by network equivalence methods such as series-parallel connection combined with star triangular transformation to obtain aggregation impedance of the impedance network model; and analyzing the subsynchronous oscillation features of a system according to the aggregation impedance. The method provides a new method for subsynchronous oscillation modeling and stable analysis; and the stability and the oscillation features of the system can be simply and efficiently judged.

Description

technical field [0001] The invention relates to the technical field of power system stability analysis, in particular to a subsynchronous oscillation analysis method and device based on an impedance network model. Background technique [0002] Under the trend of increasing power electronics in modern power systems, power electronic converter technology not only changes the form of primary equipment in the power grid, but also significantly changes the power system due to its unique multi-scale sequential control mechanism and low-inertia wide-band response characteristics. The dynamic characteristics of the system bring new stability problems. In recent years, the new type of subsynchronous oscillation (SSO) caused by the large-scale connection of wind power, photovoltaic and other variable power sources to the power grid has become particularly prominent. In addition, the negative resistance characteristics of the converter-type constant power load at the sub-synchronous f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 谢小荣刘华坤
Owner TSINGHUA UNIV
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