Frequency domain identification method and system of sub/super synchronous coupling impedance model of electric power system

Abstract

The invention discloses a frequency domain identification method and system of a sub/super synchronous coupling impedance model of an electric power system. The system comprises a disturbance signal generation module, a data acquisition module and an impedance model identification module. The disturbance signal generation module is used for generating disturbance signals and injecting the disturbance signals to a port of an electric power device. The data acquisition module is used for acquiring real-time voltage data and real-time current data at the port of the electric power device. The impedance model identification module is used for identifying the acquired voltage data and the acquired current data to obtain the sub/super synchronous coupling impedance model of the electric power system. The method and the system are advantageous in that the sub/super synchronous coupling impedance model of the electric power system can be completely measured; models corresponding to multiple sub/super synchronous frequencies can be continuously measured; operation is simplified to a certain degree; workload is reduced; large quantity of repeated work is avoided; a transmission function expression of a coupling model can be obtained through identification of the coupling model of multiple groups of discrete frequency points; analysis of vibration risks in the whole electric grid system is facilitated.

Description

technical field [0001] The invention relates to the technical field of power system analysis and control, in particular to a frequency-domain identification method and system for a sub / supersynchronous coupling impedance model of a power system. Background technique [0002] With the improvement of the reliability requirements of the power system, a large number of power equipment is integrated into the power grid, and the complexity of the power system is greatly increased, which brings challenges to the stability analysis of the power system. The application of a large number of power electronic equipment has made the power grid more intelligent and flexible, but at the same time it has also changed the dynamic characteristics of the power system, especially when the specific parameters of the power equipment are not known, it is difficult to directly analyze the dynamic process of the power system . [0003] At present, there are methods such as electromagnetic transient...

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Problems solved by technology

However, for power equipment with unknown parameters, the sub / supersynchronous coupling impedance model cannot be directly obtained from the mechanism analysis

For this kind of situation, most of the existing methods are to repeatedly measure the sub / supersynchronous coupling impedance model at different sub / supersynchronous frequencies, but the workload is huge and the steps are cumbersome. here comes the difficulty

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