Improvement for Method of Active Frequency Drift and Application in Islanding Detection
In this paper,an active frequency drift with positive feedback with low harmonic and variable frequency positive feedback coefficient algorithm is proposed to solve the problem of large harmonics and large detection blind areas caused by constant chopper factor and the frequency positive feedback coefficient in islanding detection.In islanding detection model,the algorithm is simulated and studied.The results show that compared with the traditional active frequency drift with positive feedback,the proposed algorithm can shorten the islanding detection time by about three grid cycles,and reduce the total harmonic distortion of inverter output current from 0.96％to 0.46％.
islanding detectionlow harmonicactive frequency driftvariable frequency positive feedback coefficient
万方数据
维普
