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By considering real power forecast of DGs. reactive power ranges are better determined and used for day-ahead reactive power dispatch of distribution networks. In particular. errors of real power forecast have been used to estimate probability distribution of reactive power outputs available for achieving optimal power flow and reducing network losses. A pre-coarse-fine adjustment method is proposed to consider reactive power output limits of DGs. as well as the switching lifecycle of shunt compensators. DG output capacity is considered in coarse optimization of reactive power supply of shunt compensators. Therefore. switching number can be reduced. which can prolong the equipment service life and reduce the costs of shunt compensators. In the fine optimization. DGs can be fully regulated to balance the deviation of reactive power because an initial shunt compensator scheme which has been produced before the fine optimization. Therefore. lower network losses and voltage deviations can be achieved. Multiple iterations between the discrete shunt compensators regulation and the continuous DG regulation are used to achieve coordination. Therefore. the overall optimal reactive power dispatch has been obtained in order to increase the utilization rate of DG reactive power. and reduce loss costs and switching costs of shunt compensators.
