Real-time reliability evaluation method for converter for wind power generation

Abstract

The invention discloses a real-time reliability evaluation method for a converter for wind power generation, and belongs to the technical field of wind power converter reliability assessment. The method is based on wind generating set state monitoring data, random temperature fluctuation information of components is extracted through a rain flow algorithm, and then the real-time failure rate of a wind power converter is calculated. According to the real-time reliability evaluation method, consideration can be given to the influence on the real-time reliability of the wind power converter by the magnitude of operating power and the power fluctuation intensity of a wind generating set at the same time, a scientific basis is provided for condition based maintenance of the wind power converter, besides, technical support is provided for selection of the appropriate converter according to different wind farm wind conditions, and the efficient, reliable and safe operation of the wind generating set can be ensured.

Description

technical field [0001] The invention belongs to the technical field of wind power converter reliability evaluation, and relates to a real-time reliability evaluation method of a wind power converter. Background technique [0002] Wind power converter is an important link that affects the stability of wind turbines and their connection to the grid, and its failure may lead to major safety accidents and economic losses. The actual turbulent wind speed often causes random fluctuations in the output power of the wind power converter, which in turn makes the converter one of the weakest links in the wind power system. [0003] However, the accurate evaluation of the change law of the real-time failure rate of the converter during the operation of the wind turbine has not yet been realized. The existing technology mainly uses engineering statistical methods to study the failure rate of wind power converters. The static failure rate is used for the devices in the research, which c...

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Problems solved by technology

[0003] However, accurate evaluation of the change law of the real-time failure rate of the converter during the operation of the wind turbine has not yet been realized.

The existing technology mainly uses engineering statistical methods to study the failure rate of wind power converters. The static failure rate is used for the devices in the research, which can only reflect the long-term reliability level of the power converter in certain fixed modes, but has no effect on the actual operation. As far as wind power converters are concerned, this assumption is idealized: on the one hand, due to the short period of actual application of wind power converters in my country and the insufficient number of samples, it is not easy to obtain a statistically significant failure rate for large samples; on the other hand , the failure rate of power electronic devices is closely related to the working conditions. With the accumulation of fatigue loss in the operation of wind turbines, the failure rate of power electronic devices should gradually increase

In addition, there are also some studies based on the relationship between the failure rate of wind power converter components and their temperature, and analyze the change of component failure rate with the operation time of wind turbines. However, such studies only consider the situation of wind turbines under the maximum output state , the impact of random fluctuations in the output power of the wind power converter on its failure rate cannot be considered

In addition, random fluctuations in the operating power of wind turbines will cause random fluctuations in the temperature of converter components, which in turn leads to questionable accuracy of existing temperature extraction methods

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