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Low-frequency oscillation mode time-frequency analyzing method of power system

A low-frequency oscillation, time-frequency analysis technology, applied to electrical components, circuit devices, AC network circuits, etc. Effect

Inactive Publication Date: 2014-12-10
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

However, the existing low-frequency oscillation mode analysis methods are not effective in processing non-linear and noise-containing low-frequency oscillation signals, and have broken the connection between the time domain and frequency domain of mode analysis, which is worthy of further improvement

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  • Low-frequency oscillation mode time-frequency analyzing method of power system
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  • Low-frequency oscillation mode time-frequency analyzing method of power system

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Embodiment Construction

[0025] The present invention is a time-frequency analysis method for a low-frequency oscillation mode of a power system, the steps of which are as follows:

[0026] Step 1) Obtain the low-frequency oscillation signal of the power system, which is the grid frequency / voltage or current value during oscillation;

[0027] Step 2) For each oscillation mode included in the signal, respectively adopt the attenuation sine quantity model suitable for the oscillation mode as atoms in the atomic library;

[0028] Step 3) using the parameters of each of the above atoms, including amplitude, frequency, damping coefficient, phase, start time and end time, as the parameter group of the particle to be optimized in the particle swarm optimization algorithm, and the inner product value is the fitness value function;

[0029] Step 4) adopt the atomic matching pursuit method based on the improved particle swarm optimization algorithm to optimize the search process of the atomic matching tracking ...

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Abstract

The invention provides a low-frequency oscillation mode time-frequency analyzing method of a power system. The low-frequency oscillation mode time-frequency analyzing method comprises the following steps of: researching an atom matching trace method based on improved PSO (Particle Swarm Optimization), which is applicable to low-frequency oscillation signal analysis; and analyzing a time-frequency variation property of a low-frequency oscillation mode of the power system by using the atom matching trace method based on the improved PSO. Therefore, an atom for reflecting properties of an oscillation mode most can be selected by comparing an optimal adaptive value of the atom, so that the selection process of the atom is converted into the optimization problem of solving a function by using a particle swarm optimization algorithm. Finally, the PSO can be repeatedly operated and improved for multiple times, so as to obtain a plurality of groups of atom parameters, and a calculation result is fit by using a least square method. The low-frequency oscillation mode time-frequency analyzing method has the advantage of self-adaptively obtaining a modulus parameter of an oscillation mode, has better time-frequency resolution capability, and can be used for effectively identifying non-linear and non-stable signals. Furthermore, the effect time of each mode can be accurately reflected, and the reference foundation can be provided for mastering the low-frequency oscillation transmission property.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution engineering in a power system, in particular to a time-frequency analysis method for a low-frequency oscillation mode of a power system. Background technique [0002] With the development of the electric power industry, the structure of the power grid is complex and there are many equipments. Under the condition of adopting modern fast and high top value multiple excitation system, low-frequency oscillation often occurs on long-distance, heavy-load tie-lines, which has an important impact on the safe and stable operation of the power grid. The analysis of the low-frequency oscillation mode can guide the parameter setting of the power system stability controller, and can effectively warn the system security domain. Therefore, it is of great practical significance to study the analysis method of low frequency oscillation mode parameters. However, the existing low-freque...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 肖辉吴学斌吴昊霖杨鹏刘艳飞刘永峰
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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