Research of Improved Active Frequency Drift with Positive Feedback Islanding Detection Method
Nowadays,the active frequency drift with positive feedback (AFDPF) islanding detection method which can solve the islanding of photovoltaic (PV) systems is widely used.However,the traditional AFDPF method may cause some problems such as the missing detection of islanding and the extension of detection time when the power grid fails and the loads natures are different.In order to solve the problems,the essay proposes an improved AFDPF islanding detection method.This method introduces sign-function before the disturbance signal cf0 (initial chopping fraction).Through this way,we can make correction for cf0 so as to overcome the problems mentioned above.To verify the validity of the method,an example is utilized.The simulation analysis of the example indicates that after introducing sign-function before cf0,the islanding can be detected effectively under different loads conditions,in addition,the detection time can be reduced a lot and the grid-connected current waveform is quite good.So by this method,both the detection reliability and the detection efficiency can be improved greatly.
Photovoltaic system grid-connected Islanding detection Positive feedback Active frequency drift
LIU Guan-qi SHAO Long HU Ting
Department of Electrical Engineering North China Electric Power University Baoding,China
国际会议
杭州
英文
440-442
2013-03-22（万方平台首次上网日期，不代表论文的发表时间）