TY - JOUR
T1 - Analysis of Middle Frequency Resonance in DFIG System Considering Phase Locked Loop
AU - Song, Yipeng
AU - Blaabjerg, Frede
PY - 2018/1
Y1 - 2018/1
N2 - As the wind power technology develops, the Doubly Fed Induction Generator (DFIG) based wind power system, when connected to a weak network with large impedance, may suffer resonances, i.e., Sub- Synchronous Resonance (SSR) or High Frequency Resonance (HFR) when connected to the series or parallel compensated weak network. Besides these two resonances, a Middle Frequency Resonance (MFR) between 200 Hz and 800 Hz may appear when the Phase Locked Loop (PLL) with fast control dynamics is applied. In order to analyze the MFR, the DFIG system impedance considering the PLL is studied based on the Vector Oriented Control (VOC) strategy in Rotor Side Converter (RSC) and Grid Side Converter (GSC). On the basis of the established impedance modeling of the DFIG system, it is found that the PLL with fast control dynamics may result in the occurrence of MFR due to a decreasing phase margin. The simulation results of both a 7.5 kW small scale DFIG system and a 2 MW large scale DFIG system are provided to validate the theoretical analysis of the MFR.
AB - As the wind power technology develops, the Doubly Fed Induction Generator (DFIG) based wind power system, when connected to a weak network with large impedance, may suffer resonances, i.e., Sub- Synchronous Resonance (SSR) or High Frequency Resonance (HFR) when connected to the series or parallel compensated weak network. Besides these two resonances, a Middle Frequency Resonance (MFR) between 200 Hz and 800 Hz may appear when the Phase Locked Loop (PLL) with fast control dynamics is applied. In order to analyze the MFR, the DFIG system impedance considering the PLL is studied based on the Vector Oriented Control (VOC) strategy in Rotor Side Converter (RSC) and Grid Side Converter (GSC). On the basis of the established impedance modeling of the DFIG system, it is found that the PLL with fast control dynamics may result in the occurrence of MFR due to a decreasing phase margin. The simulation results of both a 7.5 kW small scale DFIG system and a 2 MW large scale DFIG system are provided to validate the theoretical analysis of the MFR.
KW - Controller parameters
KW - Doubly fed induction generator (DFIG) system
KW - Middle frequency resonance (MFR)
KW - Phase-locked loop (PLL)
KW - Parallel-compensated weak network parallel-compensated weak network
KW - doubly fed induction generator (DFIG) system
KW - parallel-compensated weak network
KW - middle frequency resonance (MFR)
KW - phase-locked loop (PLL)
UR - http://www.scopus.com/inward/record.url?scp=85032193742&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2017.2672867
DO - 10.1109/TPEL.2017.2672867
M3 - Journal article
SN - 0885-8993
VL - 33
SP - 343
EP - 356
JO - I E E E Transactions on Power Electronics
JF - I E E E Transactions on Power Electronics
IS - 1
M1 - 7862270
ER -