A pumped storage unit shafting degradation evaluation method and device

Abstract

The invention provides a pumped storage unit shafting degradation evaluation method and device, and belongs to the field of unit fault prediction and health management. The method specifically comprises the steps that a process probability density function is calculated by means of state quantity signals in the real-time operation process in combination with kernel density estimation; the degradation degree is obtained in combination with a health probability density function, the degradation degree is multiplied by the weight of each sampling point and then summed, and the unit shafting fusion degradation degree is obtained; different degrees of early warning signals are generated in combination with an early warning degradation degree threshold; wherein the method for acquiring the health probability density function and the weight of each sampling point comprises the following steps: performing process division on historical multi-measuring-point and multi-channel data of a shaft system of the pumped storage unit according to the state quantity of the pumped storage unit; performing non-dominated sorting according to the mean value and the standard deviation of the candidate health samples to obtain health samples; calculating a health probability density function of each sampling point in combination with kernel density estimation; synthesizing the health samples into a health sample set, and combining principal component analysis to obtain a weight; the invention has a very 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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