Current type inverter control strategy for harmonics and three-phase imbalance elimination in micro gird

Lots of inverter interfaced micro sources, rectifier loads and three-phase unbalanced loads exist in micro gird, whose character of harmonic source affects power quality seriously. For this reason, based on instantaneous reactive power theory, power decoupling control and current hysteresis control, two kinds of current type inverter control strategy, constant DC voltage control strategy and droop control strategy, are proposed which are subjected to the grid-side inverter of a micro source. Maintaining the normal output demands of a micro source, the proposed control strategy can also manage the power quality problem in micro gird, such as harmonic currents, three-phase imbalance and so forth. Meanwhile, the micro gird operating in minimum cost form can be achieved.