Electric power system broadband oscillation on-line monitoring method and system based on broadband measurement

A power system and broadband technology, which is applied in the field of broadband oscillation online monitoring of power systems based on broadband measurement, can solve problems such as huge impact on accuracy and incorrect identification results, so as to improve resistance, increase energy density distribution analysis, and realize online monitoring. Monitoring the effect
CN112698087AActive Publication Date: 2021-04-23HOHAI UNIV +2
9 Cites 3 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
HOHAI UNIV
Publication Date
2021-04-23

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides an electric power system broadband oscillation on-line monitoring method and system based on broadband measurement. The method comprises the steps of taking the active power of an observation node as an observed quantity; monitoring abrupt changes of active power and current of the observation node, and constructing a time sequence when the abrupt changes occur; obtaining main frequency spectrum distribution of oscillation by adopting a power spectral density method; in response to different types of dynamic responses of the system, executing set processing, specifically, according to the power spectrum energy distribution, selecting the frequency with the maximum energy, and setting a time window; constructing a sample matrix of an extended order based on the determined time window length; determining an effective rank of the sample matrix by adopting a singular value decomposition method; and solving mode information based on the calculation order. The oscillation trend is judged according to the identified modal damping information, and alarm information is issued. On the basis of broadband measurement, low-frequency oscillation and subsynchronous / super-synchronous oscillation can be monitored on line at the same time, broadband oscillation of an electric power system can be accurately judged, and the identification reliability is improved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the field of broadband oscillation monitoring and identification of power systems, in particular to an on-line monitoring method and system for broadband oscillations of power systems based on broadband measurement. Background technique

[0002] The interconnection of regional power grids and the gradual formation of large-scale interconnected power systems are the general trend worldwide. Due to the imbalance of regional energy distribution and economic development in my country, it is necessary to build regional interconnected large power grids to realize cross-regional, long-distance, large-capacity, low-loss, and high-efficiency transmission of large hydropower, large coal power, and large-scale renewable energy. With the expansion of the grid scale and the improvement of transmission power, large-scale centralized grid-connection of renewable energy, the structure and operation of the grid have become more and more complex...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More