Energy efficiency evaluation and diagnosis method and system of wind turbine generator and medium

Abstract

The invention provides an energy efficiency evaluation and diagnosis method and system of a wind turbine generator and a medium. The method comprises: obtaining chain type energy efficiency index abnormal knowledge of the wind turbine generator and constructing an ontology energy efficiency diagnosis knowledge base; determining a reference interval of the monitoring parameter and the energy efficiency index under each working condition; determining the difference value between the energy efficiency index and the reference value, and evaluating the energy efficiency state of the unit according to the difference value and the weight of the energy efficiency index; performing anomaly detection on the real-time data based on the corresponding reference interval, if abnormal data is detected, constructing an abnormal event network fragment according to a fault symptom, and performing matching and searching in the ontology knowledge base to diagnose a fault mode; and diagnosing a final fault reason of the wind turbine generator in combination with a causal graph model. According to the method, the energy efficiency state of the wind turbine generator can be evaluated in real time, reasons of energy efficiency abnormity and specific fault modes can be accurately diagnosed, corresponding adjustment and maintenance decisions are provided, and the accuracy of energy efficiency diagnosis is improved.

Description

technical field [0001] The present application relates to the technical field of wind power generation, and in particular to an energy efficiency evaluation and diagnosis method, system and medium of a wind turbine. Background technique [0002] With the development of wind power generation technology, the use of wind turbines for wind power generation has become more common, so how to improve the energy efficiency of wind turbines has attracted more and more attention, and the study of energy efficiency loss mechanism is the prerequisite and necessary condition for improving the energy efficiency of wind turbines . [0003] In related technologies, energy efficiency loss research is usually conducted on a single device or system of a fan. For example, in terms of the aerodynamic performance of the wind rotor, carry out research on the mechanism of the wind turbine, and study the wind energy utilization coefficient in the state of the vortex ring according to the momentum t...

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Problems solved by technology

Most of the detection systems currently developed based on these researches also evaluate and diagnose the performance status of a single component of the wind turbine, and these systems are only for state monitoring of the equipment, or for analyzing the performance of the equipment.

[0004] However, studies that fully consider the mechanism of wind turbine energy efficiency loss can more comprehensively demonstrate the current energy efficiency level of wind turbines. The research methods in the above-mentioned related technologies cannot study different energy efficiency losses and their relationship from the perspective of the whole wind turbine. , resulting in low diagnostic accuracy of the current energy efficiency detection system, and the diagnostic reasoning function is relatively single

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