TY - JOUR
T1 - Distributed Active Synchronization Strategy for Microgrid Seamless Reconnection to the Grid under Unbalance and Harmonic Distortion
AU - Tang, Fen
AU - Guerrero, Josep M.
AU - Vasquez, Juan Carlos
AU - Wu, Dan
AU - Meng, Lexuan
PY - 2015/11
Y1 - 2015/11
N2 - Microgrids can operate in both grid-connected and islanded modes. In order to seamlessly transfer from islanded to grid-connected modes, it is necessary to synchronize microgrid voltage, frequency and phase to the main grid. However, since the microgrid is often based on power electronics converters, the synchronization process is quite different compared to the quasi-synchronism control in conventional power systems. Firstly, in order to address this concern, the microgrid synchronization criteria are derived. Based on these criteria, a novel distributed active synchronization strategy is proposed, which takes into account not only the fundamental component but also positive and negative sequences of the harmonic components. This way a seamless reconnection to the main grid can be performed. The proposed method is implemented in the secondary control level of a hierarchical control structure. Real-time hardware-in-the-loop results show the feasibility of the proposed technique.
AB - Microgrids can operate in both grid-connected and islanded modes. In order to seamlessly transfer from islanded to grid-connected modes, it is necessary to synchronize microgrid voltage, frequency and phase to the main grid. However, since the microgrid is often based on power electronics converters, the synchronization process is quite different compared to the quasi-synchronism control in conventional power systems. Firstly, in order to address this concern, the microgrid synchronization criteria are derived. Based on these criteria, a novel distributed active synchronization strategy is proposed, which takes into account not only the fundamental component but also positive and negative sequences of the harmonic components. This way a seamless reconnection to the main grid can be performed. The proposed method is implemented in the secondary control level of a hierarchical control structure. Real-time hardware-in-the-loop results show the feasibility of the proposed technique.
KW - Voltage harmonics
KW - Hierarchical control
KW - Synchronization
KW - Microgrid
KW - Voltage unbalance
U2 - 10.1109/TSG.2015.2406668
DO - 10.1109/TSG.2015.2406668
M3 - Journal article
SN - 1949-3053
VL - 6
SP - 2757
EP - 2769
JO - I E E E Transactions on Smart Grid
JF - I E E E Transactions on Smart Grid
IS - 6
ER -