A method and device for evaluating the shaft system deterioration of a pumped-storage unit

Abstract

The invention provides a method and device for evaluating the shafting deterioration of a pumped storage unit, which belongs to the field of failure prediction and health management of the unit. The method is specifically: using the state quantity signal in the real-time operation process, combined with the kernel density estimation to calculate the probability density function of the process ; Combined with the health probability density function to obtain the degree of deterioration, which is multiplied by the weight of each sampling point and then summed to obtain the shafting fusion deterioration degree of the unit; it is supported to generate warning signals of different degrees in combination with the threshold of the early warning deterioration degree; obtain the health probability density function and The weight method of each sampling point is as follows: divide the history data of multiple measuring points and channels of the pumped storage unit shaft system according to the state quantity of the pumped storage unit; perform non-dominated sorting according to the mean and standard deviation of the candidate healthy samples to obtain the health Samples; combined with kernel density estimation, calculate the health probability density function of each sampling point; combine healthy samples into a healthy sample set, and combine with principal component analysis to obtain weights. The invention has high application value.

Description

technical field [0001] The invention belongs to the field of unit failure prediction and health management, and more specifically relates to a method and device for evaluating the shafting deterioration of a pumped storage unit. Background technique [0002] With the development of the economy and society, the power consumption and the peak-to-valley difference of the grid continue to increase. Among the current energy storage technologies, the pumped storage technology is mature, with large storage capacity and high storage efficiency. The pumped storage unit not only plays a role in the grid. The function of peak shaving and frequency modulation also plays the role of emergency backup, phase modulation, black start and other functions. Fault prediction and health management of pumped storage units is an important guarantee for safe, stable and economical operation of the unit. The shaft system is an important part of the pumped storage unit, and its deterioration seriousl...

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the object of the present invention is to provide a method and device for evaluating the shafting deterioration of a pumped storage unit, aiming to solve the following problems in the existing method for evaluating the degree of deterioration of the shafting of a pumped storage unit: (1) not considering Due to the randomness of the sample, only deterministic data are generated in each process; (2) The sampling parameter estimation method usually requires prior conditions, which cannot reflect the actual distribution characteristics in the case of complex sample distribution; (3) When calculating the axis system The deterioration degree often only considers the single-channel data of a single measuring point, and there will be an error of replacing the plane with a point; therefore, the existing evaluation method of the shafting deterioration degree of the unit has low application value

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