A method for evaluating power supply capacity of medium voltage distribution network based on distribution system reliability

Abstract

The invention discloses a medium-voltage power distribution network power supply capacity evaluation method based on reliability of a power distribution system. The medium-voltage power distribution network power supply capacity evaluation method comprises the steps of: establishing a medium-voltage power distribution network power supply capacity evaluation model based on reliability of the power distribution system; providing a solution method for the medium-voltage power distribution network power supply capacity evaluation model based on reliability of the power distribution system, wherein the solution method includes the two aspects of performing solution calculation of reliability of the power distribution system and verifying whether the reliability meets a reliability constraint, and calculating power supply capacity of the power distribution system; and providing a medium-voltage power distribution network power supply capacity evaluation process based on reliability of the power distribution system. The medium-voltage power distribution network power supply capacity evaluation method can analyze the reliability of the existing power distribution system grid structure from the perspective of the power distribution system grid structure, regards a reliability index in the power distribution system as a constraint condition, further releases the power supply capacity margin of the power distribution system on the premise of satisfying the reliability constraint of the power distribution system in a targeted manner, and excavates the power supply potential. The medium-voltage power distribution network power supply capacity evaluation method can provide support for improving power supply capacity of the existing power distribution network structure, and promotes reasonable development of construction structure and planning technology of the urban power grid.

Description

technical field [0001] The invention relates to a method for evaluating the power supply capability of a medium-voltage distribution network. In particular, it relates to a medium-voltage distribution network power supply capacity evaluation method based on distribution system reliability for urban distribution network planning. Background technique [0002] As an important link in the production, transmission and use of electric energy, the power distribution system is the link between users and the power generation and transmission systems. Scientific and rational calculation of the power supply capacity of the power distribution system is a key part of the current urban power grid evaluation and development. Considering that in urban areas, it is difficult to obtain new substation sites and underground passages for new feeders from the planning and renovation of power distribution systems. Therefore, rationally evaluating the power supply capacity of the existing power d...

AI Technical Summary

Problems solved by technology

[0004] However, for the commonly used calculation method of distribution system power supply capacity considering the N-1 safety criterion, a rigid constraint is adopted, and there are certain problems in actual planning

First, in view of the complex relationship between equipment load rate and system reliability, the N-1 criterion tends to be a necessity criterion, so considering it alone is not enough to ensure that the system can have good power supply quality; second, due to the power distribution The duration of the network load peak is very short, the peak load is usually several times the average load, and different types of loads have different requirements for power supply reliability. Therefore, the system power supply capacity obtained according to the N-1 criterion there will be a certain margin

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