Analytical Calculation Method and Device for Frequency and Amplitude Parameters of Constant Amplitude Oscillation in Power System
A power system, constant amplitude oscillation technology, applied in the field of analytical calculation of frequency and amplitude parameters of amplitude oscillation, can solve problems such as impact, impedance model can not be calculated by constant amplitude oscillation amplitude and frequency analysis, power, voltage fluctuations, etc.
Active Publication Date: 2022-07-05
TSINGHUA UNIV +1
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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
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[0031] The following describes in detail the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to be used to explain the present application, but should not be construed as a limitation to the present application.
[0032] The following describes the method and device for analytical calculation of frequency and amplitude parameters of constant-amplitude oscillation of a power system according to embodiments of the present invention with reference to the accompanying drawings.
[0033] In the power system, constant amplitude oscillation will cause continuous fluctuation of power and voltage, which will adversely affect the stable operation of the power system and the healthy l...
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The present invention provides a method and device for analytical calculation of frequency and amplitude parameters of constant-amplitude oscillation of a power system, wherein the method includes: acquiring grid parameters, converter parameters and controller parameters in the power system; controlling the operation of the power system , and obtain the working condition parameters of the power system during stable operation; according to the converter parameters, the controller parameters and the working condition parameters, solve the nonlinear improvement guide of the converter under the voltage amplitude disturbance. determine whether the nonlinear improved admittance model curve of the converter satisfies the preset condition; if so, determine that the current voltage disturbance amplitude is the amplitude of the constant-amplitude voltage oscillation at the common connection point in the power system value; based on the preset amplitude-phase critical stability criterion and the grid parameters, determine the frequency of constant-amplitude voltage oscillation. The invention can analytically calculate the amplitude and frequency of constant-amplitude oscillation, and make up for the deficiency of the traditional impedance model in analyzing constant-amplitude oscillation parameters of the power system.
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 analytical calculation of frequency and amplitude parameters of constant-amplitude oscillation of a power system. Background technique [0002] In recent years, renewable energy power generation such as wind power generation and photovoltaic power generation have developed rapidly. However, the grid connection problem of renewable energy power generation systems based on power electronic equipment has also brought a series of new stability challenges. For example, the subsynchronous 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 its stability, it often shows that the voltage, current, power and other electrical quantities oscillate at a certain frequency. With the divergence of the oscillation amplitude, it may ...
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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