A two-layer two-stage dispatching strategy for active distribution network with micro-grid considering multiple interactions

Abstract In order to strengthen the interaction ability between the active distribution network and multiple micro-grids, the micro-grid and micro-grid, the source and load, this paper proposes a day-ahead dispatching optimization strategy for active distribution network with multiple micro-grids under multiple interactions. Some comparisons were made with other dispatching strategies to verify the effectiveness of the proposed strategy. A two-layer two-stage dispatching model was constructed. The minimum active power loss of active distribution network is regarded as the objective function at the upper layer. The comprehensive optimization of economy and environmental protection of micro-grid is taken as the objective function of the first stage, and the minimum power unbalance is taken as the objective function of the second stage at the lower layer. In our strategy, the node voltage, state of charge of energy storage equipment and unbalanced interactive power of the tie line were set as off-limit penalties to ensure the normal operation of the each system. Meanwhile, the comprehensive benefits of each target subjects were taken into account. An improved IEEE 14 node example system was set up as the upper layer active distribution network, and five-machine eight-terminal loop system as the lower layer micro-grid. With the aid of artificial fish swarm and the non-dominant sorting genetic algorithm-Ⅱ to solve and optimize the equation and parameters, the feasibility and effect of dispatching strategy and model were verified. The results show that the strategy proposed in this paper can effectively reduce the loss growth rate of active distribution network and improve the comprehensive benefit of each micro-grid.