Medium-voltage power distribution network accurate-planting method based on three layers of macroscopic networking constraints

Abstract

The invention discloses a medium-voltage power distribution network accurate-planting method based on three layers of macroscopic networking constraints. The medium-voltage power distribution networkaccurate-planting method comprises the following steps of accurate diagnosis of a power distribution network, accurate load prediction, supply zone classification and division in a planned area, transformer substation optimization and planning in the planned area, three layers of macroscopic networking constraining including channel networking, grid networking and main transformer networking and embodying top layer definitiveness of overall networking and the overall relevance of grid racks, establishment of target grid racks based on the networking constraints and distance harmonization of the grid racks. Interstation channel networking based on fertility layout, grid flakiness networking based on nearby contact optimization and overall main-transformer networking based on device utilization rate optimization can be achieved through spatial overall planning and are used as constraints to strengthen the top layer definitiveness of planning results and whole harmonization. Planned target guidance and used equipment utilization principles are strengthened through time length harmonization. The operability, scientificity and accuracy of planned schemes are improved.

Description

technical field [0001] The invention relates to a distribution network planning method, in particular to an accurate planning method for a medium-voltage distribution network based on three-layer macro-network constraints, which is composed of a network, simple in wiring, highly reliable distribution network and saves investment. Background technique [0002] Under the background of new power reform, precise planning has become an important leader in optimizing resource allocation, avoiding investment waste, and improving power grid enterprise and social benefits. Different from the main network, the distribution network project has a large volume, and it is difficult to coordinate and manage multiple departments such as construction, operation and maintenance, marketing, and scheduling. Layer skin, the project is difficult to land. [0003] At present, the main problems existing in the distribution network are as follows: the lines are crossed and detoured for power supply...

AI Technical Summary

Problems solved by technology

Different from the main network, the distribution network project has a large volume, and it is difficult to coordinate and manage multiple departments such as construction, operation and maintenance, marketing, and scheduling. Layers of skin make it difficult to implement the project

[0003] At present, the main problems in the distribution network are: circuit crossing and circuitous power supply, complex contact relationship, and difficult to find faults; unbalanced equipment load, heavy load, light load, and equipment that does not meet N-1 are relatively concentrated and appear in places with high load density In the area, there is a lot of pressure in the peak summer; the interval management is not in place, and if the interval is exhausted, the substation is still lightly loaded

These problems lead to poor distribution network indicators, such as key indicators such as connection rate and supply transfer rate are lower than the requirements of the guidelines, and there is a lot of room for improvement of the distribution network structure

[0004] In view of the problems existing in the distribution network, in the actual distribution network planning and construction, the "problem-oriented" thinking is usually emphasized. However, due to the lack of goal-oriented theory, there are infinite solutions, which cannot ensure the overall rationality and long-term effectiveness of the planning scheme. cause waste of investment

[0005] In recent years, more and more power supply companies have carried out precise planning and research on distribution networks based on power supply grids, in order to solve the problem of complex wiring of medium-voltage lines and clarify the authority for construction, operation and maintenance scheduling; the grid division of existing distribution networks There are two ways of thinking: one is to divide based on the functional properties of the planned plots, which belongs to the traditional zoning method and is more random, and different planners may obtain completely different planning schemes; the other is to base the power supply capacity of several sets of standard wiring The size and scope of grid division, that is, the method of quantitative or quasi-quantitative division according to the size of the load, but due to the lack of top-level design guidance at the macro level, this idea of ​​​​dividing and conquering with large size and small size often leads to local optimal results, and there are also grids Divide more random problems

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