Method and device for judging oscillation damping ratio polarity of generator speed regulating system

Abstract

The embodiment of the invention discloses a method and a device for judging the oscillation damping ratio polarity of a generator speed regulating system. Starting with an occurrence mechanism of a small disturbance fluctuation process of a generator set, the invention discloses a relation between the damping ratio of the generator speed regulating system and an important variable in the small disturbance process, thereby being capable of judging the oscillation damping ratio polarity of the generator speed regulating system quickly, simply and conveniently, not only having an intuitive physical concept, but also being easy to calculate in formula, and being convenient for visually judging whether the speed regulating system provides positive damping to suppress low-frequency oscillation or provides negative damping to intensify power oscillation in the low-frequency oscillating process.

Description

technical field [0001] The invention relates to the field of generator speed control systems, in particular to a method and device for judging the polarity of an oscillation damping ratio of a generator speed control system. Background technique [0002] At present, extensive research has been carried out on the occurrence mechanism and analysis methods of unit fluctuations at home and abroad, mainly including the traditional negative damping theory and the newly proposed forced oscillation theory. The damping ratio is generally used to evaluate the performance of generating units. Dynamic characteristics and dynamic behavior. The current method of calculating the damping ratio is to calculate the direct formula from the measured test waveform or the data recorded by the fault recorder. The calculated damping ratio is the total damping ratio of the output characteristics of the entire generator set, including the generator set excitation and speed regulation. The damping of...

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Problems solved by technology

The current method of calculating the damping ratio is to calculate the direct formula from the measured test waveform or the data recorded by the fault recorder. The calculated damping ratio is the total damping ratio of the output characteristics of the entire generator set, including the generator set excitation and speed regulation. The damping of the control system and the sum of mechanical damping; the vibration source location method based on the energy function can distinguish whether the generator set is the vibration source, the calculation formula is relatively complicated, and the physical concept is not intuitive enough

The above two mainstream methods for analyzing the low-frequency oscillation of the generating set do not separately analyze and calculate the damping conditions provided by the different control systems of the generating set, and only obtain the overall external characteristics of the generating set

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