Abstract
This paper considers the economy and stability of the microgrid cluster system, and proposes a two-level energy optimization dispatching strategy for the microgrid cluster, which aims to coordinate the economic benefits and operational risks of the microgrid while reducing the interactive power and fluctuations between the microgrid cluster and the distribution network, and reduce line loss. The first level takes the microgrid as the research object, takes the highest economic benefit and the lowest operational risk as the optimization goals, uses the improved PSO algorithm to solve the problem, and builds the unit risk-economic benefit ratio screening solution set, and then formulates the internal dispatching candidate strategy of the microgrid. The second level is based on the premise that the interactive power between the microgrid cluster and the distribution network is minimized, and the optimal internal dispatching strategy of each microgrid is determined. Then the line loss of the microgrid cluster system is considered, and the microgrid cluster energy complementary scheme is formulated. Finally, a practical example verifies the feasibility and effectiveness of the two-level dispatching strategy and the improved algorithm.
Highlights
In recent years, the use of renewable energy to replace traditional fossil energy and distributed power generation as a supplement to traditional centralized power generation has become an important transformation direction for the development of the energy and power industry [1]-[3]
Based on the existing research, this paper proposes a two-level energy optimization dispatching strategy for microgrid cluster, which can ensure the stability of microgrid cluster while taking into benefits of microgrids
In order to make full use of the complementary advantages of energy and avoid long-distance grid-connected transmission of fluctuating energy, the second level considers the interactive power between the microgrid cluster and the distribution network, as well as the line loss of the microgrid cluster system, and establishes an optimization model
Summary
The use of renewable energy to replace traditional fossil energy and distributed power generation as a supplement to traditional centralized power generation has become an important transformation direction for the development of the energy and power industry [1]-[3]. [12] established different distributed power models in the microgrid, and proposed an optimized dispatching method for microgrid clusters from the perspective of centralized control. [18] solves the power sharing problem in a networked hybrid AC/DC microgrid cluster by using back-to-back converters Both AC and DC microgrid clusters adopt hierarchical distributed collaborative control strategies (internal microgrid control), but this model is only applicable to independent microgrid systems. The first level takes the microgrid as the research object, and establishes an optimization model with the highest economic benefits and the lowest operating risk as the goal. In order to make full use of the complementary advantages of energy and avoid long-distance grid-connected transmission of fluctuating energy, the second level considers the interactive power between the microgrid cluster and the distribution network, as well as the line loss of the microgrid cluster system, and establishes an optimization model
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