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Low-frequency oscillation online control strategy based on mode matching

A low-frequency oscillation and pattern-matching technology, applied in the direction of AC network flicker reduction, AC network circuits, electrical components, etc., can solve the problems that the layout and design are not helpful, and the dynamic model of the power system cannot be drawn, so as to improve the recognition speed and improve The effect of robustness

Inactive Publication Date: 2021-03-26
ANHUI POLYTECHNIC UNIV MECHANICAL & ELECTRICAL COLLEGE
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Problems solved by technology

Analysis of low-frequency oscillations in power systems usually involves time-domain simulation and small disturbance analysis, but time-domain simulation cannot draw the entire dynamic model of the power system, and the simulation results have multi-mode coupling, which is not helpful for the layout and design of controllers. The analysis method studies each oscillation mode separately, and provides important information for the layout and design of the controller

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  • Low-frequency oscillation online control strategy based on mode matching
  • Low-frequency oscillation online control strategy based on mode matching
  • Low-frequency oscillation online control strategy based on mode matching

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Embodiment Construction

[0047] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below in conjunction with specific embodiments.

[0048] Such as figure 1 As shown, a low-frequency oscillation online control strategy based on pattern matching includes the following steps:

[0049] (1) By monitoring the time-domain variation curve, adopting the improved Prony algorithm to calculate and analyze the frequency spectrum of the dynamic curve for the time-domain signal;

[0050] The improved Prony algorithm first eliminates the noise of each signal by wavelet transform, eliminates the DC component, sets up a multi-signal sample function matrix, improves the Prony algorithm by the singular value-total least squares method, and separates the signal space and the noise subspace, Determine the order of the signal;

[0051] The signal model calculated by the improved Prony algorithm i...

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Abstract

The invention discloses a low-frequency oscillation online control strategy based on mode matching, and relates to the technical field of power system stabilization and control. The low-frequency oscillation online control strategy comprises the step of applying a dynamic stability control strategy generated by small interference calculation and sensitivity analysis to low-frequency oscillation online based on mode matching. According to improved Prony, QR and IRA algorithms and a characteristic value sensitivity principle, a criterion of mode matching and an online modal calculation method are provided, advantages of the time domain improved Prony algorithm, the frequency domain QR algorithm and the IRA algorithm are combined to match a small interference calculation result with mode information obtained in real time by the on-line improved Prony algorithm, when a vibration mode calculated by small interference real-time scanning is mismatched, a power system stabilizer PSS based on aparticle swarm optimization technology is adopted for restraining low-frequency oscillation, the low-frequency oscillation recognition speed of a large power grid is improved on the whole, meanwhile,the real-time performance and the accuracy of discovery and solution are met, parameter optimization is conducted on the PSS through the particle swarm optimization technology, and the robustness ofthe system is improved.

Description

technical field [0001] The invention relates to the technical field of power system stability and control, in particular to an online control strategy for low-frequency oscillation based on pattern matching. Background technique [0002] With the increasing scale of power grid interconnection, the operating characteristics of the power grid are becoming more and more complex, and low-frequency oscillations often occur in large-scale interconnected power grids. It has become an important issue that threatens the security of the power grid. Analysis of low-frequency oscillations in power systems usually involves time-domain simulation and small disturbance analysis, but time-domain simulation cannot draw the entire dynamic model of the power system, and the simulation results have multi-mode coupling, which is not helpful for the layout and design of controllers. The analysis method studies each oscillation mode separately, which provides important information for the layout a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/002H02J2203/20
Inventor 谌江波刘庆丰汤文杰王玥
Owner ANHUI POLYTECHNIC UNIV MECHANICAL & ELECTRICAL COLLEGE
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