Real-time reliability evaluation method for converter for wind power generation
A technology of wind power converters and converters, which is applied in the direction of instruments, data processing applications, calculations, etc., and can solve the problem of increased failure rates, random fluctuations in the temperature of converter components, and the inability to consider the impact of wind power converter failure rates and other issues to achieve the effect of safe operation
Active Publication Date: 2014-10-08
CHONGQING UNIV
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[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
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[0033] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0034] figure 1 It is a flow chart of the method of the present invention, as shown in the figure, the reliability evaluation method of the present invention includes the following steps: Step 1: Based on the state monitoring data (such as SCADA data) of the wind farm, obtain the reliable Information related to performance assessment (including converter active power, converter reactive power, converter line current, converter line voltage, and temperature inside the converter cabinet, etc.); Step 2: Run the converter Divide the two-dimensional state of the working condition, that is, the output active power of the converter is grouped per hour, and the two-dimensional state is divided according to the average power and power fluctuation intensity per hour, and the corresponding distribution probability p(i, j ); Step 3: classify the activ...
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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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Inventor 李辉李洋季海婷秦星杨东何蓓欧阳海黎刘静兰涌森唐显虎
Owner CHONGQING UNIV
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