In order to achieve desirable power quality in the critical bus (CB) in microgrids, primary and secondary control can be used to realize unbalance compensation and at the same time, to make distributed generators (DGs) share the compensation efforts. Considering that the power quality requirements in different areas and for different consumers can be different, this paper implements a tertiary control over secondary and primary control levels so as to achieve optimal unbalance compensation control. Hardware-in-the-loop results are presented to demonstrate the effectiveness of the method.