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Method and device for analyzing and calculating frequency and amplitude parameters of constant-amplitude oscillation of power system

A power system, equal-amplitude oscillation technology, applied in the field of analysis and calculation of frequency and amplitude parameters of amplitude oscillation, can solve problems such as power, voltage fluctuation, impact, and unfavorable health and life of equipment in stable operation of the power system

Active Publication Date: 2020-11-20
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Equal-amplitude oscillation will cause continuous fluctuations in power and voltage, which will adversely affect the stable operation of the power system and the healthy life of the equipment
[0003] However, traditional impedance models cannot make analytical calculations for the amplitude and frequency of constant-amplitude oscillations

Method used

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  • Method and device for analyzing and calculating frequency and amplitude parameters of constant-amplitude oscillation of power system
  • Method and device for analyzing and calculating frequency and amplitude parameters of constant-amplitude oscillation of power system
  • Method and device for analyzing and calculating frequency and amplitude parameters of constant-amplitude oscillation of power system

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Embodiment Construction

[0031] Embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote 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 application, and should not be construed as limiting the present application.

[0032] The method and device for analyzing and calculating the frequency and amplitude parameters of the constant amplitude oscillation of the power system according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0033] In the power system, the constant amplitude oscillation will cause continuous fluctuations in power and voltage, which will adversely affect the stable operation of the power system and the healthy life of the equipment.

[0034] The impedanc...

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Abstract

The invention provides a method and device for analyzing and calculating frequency and amplitude parameters of constant-amplitude oscillation of a power system, and the method comprises the steps: obtaining a power grid parameter, a converter parameter and a controller parameter in the power system; controlling the power system to operate, and obtaining working condition parameters of the power system during stable operation; solving to obtain a converter nonlinear improved admittance model curve under voltage amplitude disturbance according to the converter parameters, the controller parameters and the working condition parameters; judging whether the nonlinear improved admittance model curve of the converter meets a preset condition or not; if YES, determining that the current voltage disturbance amplitude is the amplitude of equal-amplitude voltage oscillation at a common connection point in the power system; and determining the frequency of equal-amplitude voltage oscillation basedon a preset amplitude-phase critical stability criterion and the power grid parameters. According to the method, the amplitude and the frequency of equal-amplitude oscillation can be analyzed and calculated, and the defects of a traditional impedance model in the aspect of analyzing equal-amplitude oscillation parameters of a power system are overcome.

Description

technical field [0001] The invention relates to the field of power system stability analysis and control, in particular to a method and device for analyzing and calculating frequency and amplitude parameters of equal amplitude oscillations in power systems. Background technique [0002] In recent years, renewable energy power generation such as wind power generation and photovoltaic power generation has developed rapidly. However, the grid connection of renewable energy generation systems based on power electronic equipment also brings a series of new stability challenges. For example, the sub-synchronous resonance or high-frequency resonance between the wind power converter and the weak grid often causes the power system to lose stability. After the power system loses stability, it often shows that its voltage, current, power and other electrical quantities oscillate at a certain frequency. With the divergence of the oscillation amplitude, it may cause the action of the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/241H02J3/381H02J2203/20H02J2300/20H02J2300/24H02J2300/28Y02E40/40
Inventor 谢小荣姜齐荣吴天昊亢朋朋王衡
Owner TSINGHUA UNIV
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