Online prevention and control method for low-frequency oscillation of electric power system on basis of two types of mechanisms

Abstract

The invention relates to an online prevention and control method for low-frequency oscillation of an electric power system on the basis of two types of mechanisms. By the method, according to the idea of online pre-decision and real-time matching, low-frequency oscillation of a negative damping mechanism and low-frequency oscillation of a forced resonance mechanism can be monitored, the low-frequency oscillation of the negative damping mechanism can be monitored online and decision supporting information can be provided by utilizing a time-domain online Prony algorithm, a real-time small interference frequency-domain QR (quadrature right-triangle)algorithm, an IRA(irregular repeat-accumulate) algorithm and a characteristic value sensitivity principle; and further, when damping ratio of a capstan oscillation mode is higher than a damping threshold while oscillation exists, transmission rules of the low-frequency oscillation of the forced resonance mechanism and disturbance sources are recognized by a direct method and a hybrid dynamic simulation method which is implemented on the basis of PSD-FDS whole process stability analysis software. By the online prevention and control method which is high in credibility, real-time data source communication is guaranteed, and the low-frequency oscillation of the two types of mechanisms are monitored on line.

Description

Technical field [0001] The invention relates to the technical field of power system stability and control, in particular to an online prevention and control method for low-frequency oscillation of a power system that takes into account two types of mechanisms. Background technique [0002] With the expansion of the interconnection scale of the power grid, the operation characteristics of the power grid are becoming increasingly complex, and the difficulty of power system stability analysis and control is increasing. The problem of low frequency oscillation caused by system interconnection has become one of the important factors that endanger the safe operation of the power grid and restrict the transmission capacity of the power grid. In recent years, two types of low-frequency oscillations, negative damping mechanism and forced resonance mechanism, have occurred in my country. In view of the new characteristics of low-frequency oscillations in the actual power grid, and conside...

AI Technical Summary

Problems solved by technology

In view of the new characteristics of low-frequency oscillations in the actual power grid, and considering new control techniques such as the current WAMS application, considering two types of low-frequency oscillations at the same time, providing online auxiliary decision support information for low-frequency oscillations, and accurately identifying disturbance sources and propagation laws have important engineering applications. value, the low frequency oscillation online decision support system with this function has not been reported yet

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