Compared with normal grid-tied inverters

multi-functional grid-tied inverter (MFGTI) can actively provide auxiliary services to enhance the power quality of microgrid. However

the available capacity of only one MFGTI for power quality enhancement is usually not adequate. Therefore

it is a challenging issue to organize and coordinate many MFGTIs in a microgrid to share the harmonic and/or reactive current without communication wire. On the basis of limitation technology

a strategy is presented to share the harmonic and reactive current in microgrid. Using the limitation threshold of detected compensating currents on synchronous rotating dq frame

the MFGTI can partly contribute their available capacities to compensate harmonic and reactive current. The experimental results performed on a microgrid demonstration verify the validation and feasibility of the proposed control strategy and algorithm. This work is supported by National High Technology Research and Development Program of China (863 Program) (No. 2011AA050204) and National Natural Science Foundation of China (No. 50907060).