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With the increasing penetration of renewable energy, the uncertainty of its power output will pose severe challenges for the reactive voltage operation of the receiving power grid. In view of the situation, a mathematical model for reactive power regulation is established in this paper, and based on Model Predictive Control, we propose a multiple-timescale optimal reactive voltage control method to reduce the effects of wind and photovoltaic uncertainties on voltage control. The IEEE-57 node system with renewable energy integration is adopted to verify the proposed model, and the results are obtained via Whale optimization Algorithm based Simulated Annealing (WOASA), which proves that with the multiple time-scale control method, the operation safety can be effectively improved, which can unleash the potential of reactive power regulation at the receiving power grid.