After outlining the characterizations of microgrid and the strategies of microgrid control

the paper analyses the power quality features on microgrid operations under different operation mode

as well as the key concerns in power quality detection. It is indicated that not only continuous phenomena but also discontinuous phenomena shall be focused on; for power quality measurement issues

among other things like evaluations against national standard limits

the impacts on electrical equipments related to power quality measurement data as well as appropriate estimation methods should be also emphasized. In the end

the paper lists the disputations on microgrid power quality controlling

the key issue is when the power quality levels of connected grid deteriorate

whether the microgrid shall transferred into island operation mode automatically.