Microgrid topology planning based on optimal loop

Abstract

The invention discloses a microgrid topology planning method based on an optimal loop and belongs to the technical field of microgrid topology planning. The method comprises the following steps that:step 1, the mathematical models of the stages of a graph theory algorithm are constructed, a microgrid is represented as a graph, and load points are represented as nodes; 2, the mathematical models of the three stages of coarsening, partitioning and refining reduction of the graph theory algorithm are respectively constructed to divide the nodes into a potential loop; 3, the mathematical models are designed into a single loop structure based on an improved traveling salesman algorithm, and the nodes in the potential loop are interconnected to form a loop, and therefore, an optimized loop topological structure can be obtained; and 4, a group of candidate microcircuit topological structures based on the optimized loop topological structure is solved according to the mathematical models designed in the step 2 and the step 3; and step 5, the candidate micro-circuit topological structures are evaluated, and an optimal loop topological structure is found out. Compared with a traditional planning structure, the microgrid topological structure based on the optimal loop designed by the invention can better ensure the power supply reliability of loads.

Description

technical field [0001] The invention relates to a micro-grid topology planning based on an optimal loop, and belongs to the technical field of micro-grid topology planning. Background technique [0002] As the scale of power grid construction continues to expand, the defects of ultra-large-scale power systems are gradually emerging. In addition, the contradiction between global resources and environmental issues has become more serious. In order to solve the problem of energy shortage in a timely manner, relevant personnel have paid more attention to regeneration and cleaning. Research and development of new energy. Due to its own advantages, distributed power generation is an effective way to solve energy crisis and environmental problems, but the grid connection of distributed power generation will bring impacts that cannot be ignored to the power system. In order to alleviate the impact of large-scale distributed power single-unit grid connection on the large power grid,...

AI Technical Summary

Problems solved by technology

[0003] With the gradual increase in the demand for distributed energy, especially distributed renewable energy, in energy consumption, the traditional radial distribution network may not be the best choice for realizing the unique functions and characteristics of the microgrid. Microgrid topology planning needs to be considered Islanding operation and self-healing capabilities in a single microgrid loop, and addressing energy balance issues when planning the ring grid, which presents greater challenges using existing methods

In addition, considering various distributed generation and energy storage facilities in microgrid topology planning makes it difficult to implement traditional planning methods based on mixed integer programming

Different from the traditional power distribution system, the fault current caused by DER and microgrid switching to grid-connected and island modes may be bidirectional, and the traditional radial network topology is difficult to deal with these faults. Therefore, research is more suitable for microgrids. Topology has become an urgent problem in the field of microgrid planning

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