Unified identification method for ubiquitous band oscillation of power system
A power system and identification method technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of neglect, large oscillation frequency span, noise, etc.
Inactive Publication Date: 2020-10-16
STATE GRID HUNAN ELECTRIC POWER +2
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Problems solved by technology
At present, most power system oscillation identification is only for a single type of oscillation (such as low-frequency oscillation, subsynchronous oscillation or supersynchronous oscillation). In the face of the problem of pan-band oscillation with multiple types of coexistence and large oscillation frequency span, existing methods are in the process of processing Oscillations with higher amplitudes are often identified, other oscillations may be considered noise and ignored
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[0031] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further clearly and completely described below in conjunction with the embodiments of the present invention. It should be noted that the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0032] It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right" etc. are based on the orientation or positional relationship shown in the drawings, and are only In order to facilitate the description of the present invention and simplify the description, it does not indicate or...
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The invention discloses a unified identification method for ubiquitous band oscillation of a power system, and the method comprises the steps: S1, screening a signal source from operation data of thepower system, and obtaining an original measurement signal from the signal source in real time; S2, filtering the original measurement signal through a plurality of band-pass filters to obtain filtering signals of different frequency bands; S3, extracting oscillation mode signals of different frequencies from the filtering signals of different frequency bands through a preset decomposition algorithm; and S4, obtaining modal information of the oscillation modal signals with different frequencies in the step S3 through a preset identification algorithm. According to the invention, the method canachieve effective decomposition of the ubiquitous frequency band oscillation in a power system signal, improves the oscillation recognition precision, and achieves the online rolling recognition of oscillation. All dominant oscillation modes can be effectively identified no matter for signals with violent oscillation or noise-like signals with potential oscillation.
Description
technical field [0001] The invention belongs to the technical field of electric power detection, and in particular relates to a unified identification method for pan-frequency band oscillation of a power system. Background technique [0002] With the large-scale access of renewable energy, the wide application of power electronic equipment, and the large-scale interconnection of AC and DC, the modern power grid optimizes resource allocation and improves system reliability. Stability issues stand out. The oscillation problem is one of the problems that threaten the stable operation of the power system. Many types of oscillations in the power system may appear at the same time and the frequency span is extremely large. [0003] Frequency, damping ratio and oscillation amplitude are the key information of the oscillation mode, and also the key parameters to realize the research of oscillation monitoring, early warning, control and protection. Identifying the modal information...
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CPCG01R31/00
Inventor 陈道君马俊杰李勇汤吉鸿刘静左剑
Owner STATE GRID HUNAN ELECTRIC POWER