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PMU-based low-frequency oscillation control method

A technology of low frequency oscillation and control method, applied in the direction of reducing/preventing power oscillation, etc., can solve the problems of poor noise damping ability and limited accuracy of analysis results, and achieve the effect of improving stability performance

Active Publication Date: 2010-06-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

The modal analysis method can effectively identify the relevant parameters of each oscillation mode, but the damping ability to noise is poor, and the accuracy of the analysis results is limited
[0012] Whether it is time-domain analysis or frequency-domain analysis, in the current low-frequency oscillation analysis methods, there is no method that directly transfers the eigenvalues ​​of the system through feedback without considering the oscillation curve and oscillation mode. The height of the system controls the low frequency oscillation

Method used

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  • PMU-based low-frequency oscillation control method
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  • PMU-based low-frequency oscillation control method

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Embodiment Construction

[0034] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0035] The present invention mainly uses the PMU to obtain the wide-area information of the whole network, combines the eigenvalue transfer factor theory and the mapping theory, and performs closed-loop control on the open-loop system through the feedback factor, effectively transferring the eigenvalues ​​that are easy to induce low-frequency oscillations to the stable area, Increase the system damping to realize the effective and robust control of the system's low-frequency oscillation.

[0036] Step 1: Initialization. Construct the original system data files, the collection volume includes:

[0037] 1) System nodes (busbars): the collection content includes node numbers, types, node voltages, phases, and upper and ...

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Abstract

The invention discloses a PMU-based low-frequency oscillation control method, which belongs to the technical field of the low-frequency oscillation control of a power system. In the method, a PMU is utilized to obtain the wide area information of a whole network; under the condition of not analyzing the oscillation mode of the system, an eigenvalue transfer factor theory and a synthetic mapping theory are utilized and a reconstruction solving method is also utilized to obtain a control influence matrix B; the advantages of circle mapping and linear mapping are combined to obtain an optimal eigenvalue transfer factor matrix F; and the system is subjected to closed-loop control through a BFBT feedback link. In the method, eigenvalues easily inducing the low-frequency oscillation of the system are directly transferred to a stable area, which increases system damping and further fulfills the aim of controlling the low-frequency oscillation of the system.

Description

technical field [0001] The invention relates to the technical field of low-frequency oscillation control of electric power systems, in particular to a low-frequency oscillation control method based on a phasor measurement unit (PMU). Background technique [0002] With the increase of power demand, the power exchange between interconnected grids will become more and more frequent, and the exchange power will also increase day by day, and the transmission line will be on the edge of the stability limit for a long time. Small disturbances in the power system are inevitable. If effective measures are taken to subside them as soon as possible, the deterioration of the system state will be effectively curbed and the safety and stability of the power grid will be effectively curbed. On the contrary, low-frequency oscillations will easily be induced, leading to large-scale and long-term power outages. Low-frequency oscillation accidents have caused serious harm to power systems both...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 马静王彤王增平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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