杨国超,苏利捷,王龙飞.基于模糊控制的改进频移式孤岛检测方法[J].电测与仪表,2019,56(11):122-127. Yang Guochao,Su Lijie,Wang Longfei.An improved frequency drift islanding detection method based on fuzzy control[J].Electrical Measurement & Instrumentation,2019,56(11):122-127.
基于模糊控制的改进频移式孤岛检测方法
An improved frequency drift islanding detection method based on fuzzy control
For the initial truncation coefficient and feedback coefficient of the traditional active frequency drift with positive feedback method in islanding detection can only take a fixed value, resulting in large detection blind zone, long detection time and high total harmonic distortion. In this paper an improved frequency drift islanding detection method based on fuzzy control was proposed. By analyzing the relationship between the disturbance and the voltage of the common coupling point in the active frequency drifting method, fuzzy control algorithm was used to fuzzify the feedback coefficient, and the feedback quantity was transformed based on the third power function to establish a new truncation coefficient. Compared with the traditional positive feedback active frequency drifting method, the improved method has reduced the blind zone, shortened the detection time, reduced the total harmonic distortion rate, and improved the power quality successfully. Finally, the new method was verified by MATLAB/Simulink simulation platform.
