Status evaluation of relay protector based on an improved fuzzy-gray method
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摘要: 针对继电保护装置状态评价的不分明性和不确切性，提出采用一种改进的模糊灰色法对继电保护装置进行状态评价。首先建立涵盖历史状况、检修状况和监测状况3个方面的指标体系，并以点灰度描述评价信息的不确切性；然后构造非线性隶属函数来求取隶属度，得到模糊灰色评价矩阵；最后对继电保护装置进行模糊灰色状态评价，并采用加权平均算子对评价结果进行再优化。实例证明该方法在评价继电保护装置状态时能更准确地反映设备的真实运行状况。Abstract: For unclear and inaccurate performance of status evaluation of relay protector, an improved fuzzy-gray method was proposed for the status evaluation problem. Firstly, an index system is constructed from aspects of historical conditions, maintenance conditions and monitoring conditions. Gray point is used to describe inaccuracy of evaluation information. Then nonlinear membership functions are constructed to attain membership, so as to get fuzzy-gray matrix. Finally fuzzy-gray status evaluation for relay protector is carried out, and evaluation result is re-optimized by weighted average operator. The example shows that the method can reflect operating condition of relay protector more accurately.
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Keywords:
- relay protector /
- status evaluation /
- fuzzy-gray method /
- nonlinear membership function /
- point gray
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