TY - JOUR
T1 - An Islanding Detection Method by Using Frequency Positive Feedback Based on FLL for Single-Phase Microgrid
AU - Sun, Qinfei
AU - Guerrero, Josep M.
AU - Jing, Tianjun
AU - Quintero, Juan Carlos Vasquez
AU - Yang, Rengang
PY - 2017/7
Y1 - 2017/7
N2 - An active islanding detection method based on Frequency-Locked Loop (FLL) for constant power controlled inverter in single-phase microgrid is proposed. This method generates a phase shift comparing the instantaneous frequency obtained from FLL unit with the nominal frequency to modify the reference phase angle. An initial low frequency variable triangular disturbance is added to the phase shift in order to reduce NDZ and accelerate the detection process especially in the case of power matching. With the modified phase angle, the frequency at PCC will be drifted away from the nominal frequency until exceeding the threshold because of the frequency positive feedback after islanding. Besides, FLL is introduced to this method in order to lock frequency quickly considering that the frequency is time-varying during the islanding detection process. Simulation and experiment have been done to evaluate this method.
AB - An active islanding detection method based on Frequency-Locked Loop (FLL) for constant power controlled inverter in single-phase microgrid is proposed. This method generates a phase shift comparing the instantaneous frequency obtained from FLL unit with the nominal frequency to modify the reference phase angle. An initial low frequency variable triangular disturbance is added to the phase shift in order to reduce NDZ and accelerate the detection process especially in the case of power matching. With the modified phase angle, the frequency at PCC will be drifted away from the nominal frequency until exceeding the threshold because of the frequency positive feedback after islanding. Besides, FLL is introduced to this method in order to lock frequency quickly considering that the frequency is time-varying during the islanding detection process. Simulation and experiment have been done to evaluate this method.
KW - Islanding detection
KW - Constant power control
KW - Single-phase microgrids
KW - Frequency-Locked Loop (FLL)
KW - Frequency positive feedback
U2 - 10.1109/TSG.2015.2508813
DO - 10.1109/TSG.2015.2508813
M3 - Journal article
SN - 1949-3053
VL - 8
SP - 1821
EP - 1830
JO - I E E E Transactions on Smart Grid
JF - I E E E Transactions on Smart Grid
IS - 4
ER -