Abstract
Active distribution networks characterized by high flexibility and controllability are an important development mode of future smart grids to be interconnected with large scale distributed generation sources including intermittent energies. However, the uncertainty of intermittent energy and the diversity of controllable devices make the optimal operation of distribution network a challenging issue. In this paper, we propose a stochastic optimal operation strategy for distribution networks with the objective function considering the operation state of the distribution network. Both distributed generations and flexible loads are taken into consideration in our strategy. The uncertainty of the intermittent energy is considered in this paper to obtain an optimized operation and an efficient utilization of intermittent energy under the worst scenario. Then, Benders decomposition is used in this paper to solve the two-stage max-min problem for stochastic optimal operation. Finally, we test the effectiveness of our strategy under different scenarios of the demonstration project of active distribution network located in Guizhou, China.
Highlights
In recent years, the access of intermittent energy, such as wind and solar, keeps increasing in distribution networks
We have developed an optimal operation strategy to realize an efficient usage of all kinds of controllable resources in active distribution networks including distributed generations and flexible loads
To decrease the formulation complexity, the models for all resources are summarized as three kinds of devices: intermittent energy, energy storage devices and power regulation devices
Summary
The access of intermittent energy, such as wind and solar, keeps increasing in distribution networks. Under such a circumstance, active distribution networks (ADNs) characterized by high distributed generation penetration and high control requirements have been widely accepted as an important development mode of future smart grids [1,2]. Compared with traditional distribution networks, active distribution networks have more controllable equipment, including energy storage systems, flexible loads, and other distributed generation sources. In active distribution network, the uncertainty of intermittent energy makes the traditional deterministic power system to a random-deterministic coupling power system. Distribution network operation concerns more about the economic benefit and the operating state, which brings great challenge to the power system optimization
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