Large power grid transient state stabilization analyzing method based on precision pattern discrimination

Abstract

The invention provides a large power grid transient state stabilization analyzing method based on precision pattern discrimination. The method comprises the following steps: step S1, obtaining dynamic response data of a power grid, wherein the relevant data includes SCADA (supervisory control and data acquisition), PMU (phasor measurement unit) and network protocol structure data; step 2, carrying out characteristic extraction on the dynamic response data of the large power grid; and step 3, carrying out real-time pattern discrimination by using a DHMM (discrete hidden markov model) method. According to the method, the dynamic response characteristics of electric characteristic vectors are considered, and the pattern discrimination is carried out and the multi-dimensional characteristic analysis is implemented at the same time, thereby improving the precision and the speed in the discrimination of a manual intelligent type evaluation method, and being beneficial to the implement of the large power grid transient state stabilization analysis.

Description

technical field [0001] The invention belongs to the field of electric power engineering, and in particular relates to a large power grid transient stability analysis method based on precise mode discrimination. Background technique [0002] At present, the common transient stability analysis methods of large power grids are as follows: [0003] (1) Time domain simulation method: [0004] The method includes steps: 1) solving the differential-algebraic equations describing the transient behavior of the system obtained according to the topological relationship among various components such as generators and loads in the power system, and obtaining the trajectory of state variables and algebraic variables changing with time; 2) Judging the stability of the system according to the change of the relative angle between the rotors of each generator within the research time. The time-domain simulation method can choose component mathematical models with different levels of detail ...

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Problems solved by technology

[0016] Aiming at the problems of slow calculation speed and inaccurate analysis results in the transient stability analysis methods of large power grids in the prior art, the present invention proposes a large-scale system based on precise mode discrimination that fully considers the dynamic response characteristics of electrical characteristic quantities. Power grid transient stability analysis method, which can conduct transient stability analysis of large power grids more quickly and accurately

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