In view of the problem with the economical dispatch of microgrids

by taking the uncertainties of renewable energy power(such as wind power and photovoltaic power)prediction and load prediction into account

the interval is utilized to describe uncertainty. Whereafter

an active-reactive power combined optimal dispatch model for the microgrid is developed since the active power and reactive power are strongly coupled in the microgrid system. Subsequently

to facilitate solution finding

the interval-based uncertain dispatch model is transformed into a general certain one with a mathematical transformation method based on the interval sequential relation. Finally

numerical simulation tests are performed on a typical microgrid system with the professional optimization software(GAMS)to verify the proposed optimal dispatch method. Based on the testing results

the influences of the interval uncertainty degree on the operating cost of microgrid and the power output of the microsources are analyzed. This work is supported by National Natural Science Foundation of China(No. 51507085).