Abstract:As the penetration of distributed resources in distribution networks and microgrids gradually increases, voltage stability and system safety under heavy load conditions, along with optimized operation, become key challenges. To address the issue of global control of the transmission network, distribution network, and microgrid on the main grid side under various penetration scenarios of massive distributed resources, we analyze the types of distributed resources integrated into different networks and propose an active and reactive power coordinated optimization control for main-distribution-microgrid interconnection utilizing potential of massive distributed resources. In the upper layer, reactive power optimization is achieved by utilizing reactive compensation devices in the transmission network and distributed electricity in the distribution network and microgrid, considering energy conversion between the microgrid and the main grid as well as storage constraints within the network. In the lower layer, focusing on the active power balance of the system, we analyze low-frequency load regulation schemes in the distribution network and establish a coordinated load regulation optimization model considering controllable load constraints in the microgrid. Finally, a dual-layer particle swarm optimization algorithm is employed to solve the multi-objective optimization problems in the upper and lower layers. The proposed dual-layer optimization control method is validated through simulations on an integrated model of the main-distribution-microgrid network containing distributed resources, using improved IEEE 33-bus, IEEE 30-bus, and IEEE 4-bus global networks. The results demonstrate theeffectiveness of the proposed method in different operating scenarios, such as heavy load conditions, multi-microgrid integration, and varying output from distributed resources.