Research of fuzzy synthetic evaluation method of power quality based on improved membership function

The establishment of membership function in synthetic evaluation of power quality is taken to discussion. This paper proposes an improved membership function for power quality fuzzy synthetic evaluation. First, the weight of power quality indicators and the confirmation of indicator limit of membership function as well as the division of quality level are deeply analyzed. Then, on the basic of evaluation indicators quality level, the traditional ridge-shaped function is improved to construct the membership function. At the same time, the fuzzy model of power quality indicators is built on this foundation. In the end, an example is given to evaluate the quality of 33 feed lines belongs to Guangzhou power grid; the result demonstrates the practicability and effectiveness of this method.