Reactive Power and Voltage Control Method of Regional Power Grid Considering Optimal Regulation Cost

In order to solve the problem that the voltage exceeds the limit and the reactive power flow fluctuates violently after the high proportion of new energy is connected, which leads to the problem that the action of reactive power compensation equipment in the substations is too frequent. This paper proposes a reactive power and voltage control method for regional grid considering the optimal regulation cost. First, dynamic partitioning is carried out according to the topology of the power grid, and then establish an optimization model with the optimal regulation cost as the target to solve the voltage and branch reactive power control objectives of each node, and finally an advanced decision-making control strategy is carried out. At the same time, in order to solve the problem of insufficient model convergence caused by the high fluctuation rate of new energy power flow, a correction algorithm based on “pre-action” is introduced as a supplement to meet the high real-time online control requirements. It is proved that the method has a good effect on reducing the action numbers of reactive power compensation equipments in substations, and effectively improves the optimal scheduling level of reactive power in regional grids.