Power distribution system power supply capability evaluation method considering influence of multiple times of transfer on reliability

Abstract

The invention relates to a power distribution system power supply capability evaluation method considering the influence of multiple times of transfer on reliability, which comprises the following steps: establishing a medium-voltage power distribution system power supply capability evaluation model, which specifically includes taking the maximum power supply capability of a medium-voltage power distribution system as an objective function, taking the reliability constraint, the matching constraint of the main transformer and the outgoing feeder, the load rate constraint of the main transformer and the feeder and the contact capacity constraint of the main transformer and the feeder as constraint conditions, and thus establishing the medium-voltage distribution system power supply capability evaluation model; performing reliability evaluation on the medium-voltage power distribution system, including state selection and sampling based on sequential Monte Carlo simulation; analyzing theinfluence of the fault mode of multiple times of transfer; and reducing load needing to be transferred in the fault mode, distributing and transfering same. The margin of the power supply capacity ofthe power distribution system can be released on the premise of meeting the reliability constraint of the power distribution system in a targeted manner, and the power supply potential is mined. Themanagement level of urban power distribution network planning is improved, and reasonable development of urban power grid construction structures and planning technologies is promoted.

Description

technical field [0001] The invention relates to a method for evaluating power supply capacity of a power distribution system. In particular, it relates to a method for evaluating the power supply capacity of a power distribution system considering the impact of multiple power transfers on reliability. Background technique [0002] As the last link of the power system to connect power users, the medium-voltage power distribution system has the closest relationship with power users. With the continuous development of the national economy, there is a big contradiction between the increasing shortage of land resources and the rapidly rising demand for electric energy, which brings more constraints to the planning and construction of medium-voltage power distribution systems. Therefore, the scientific and reasonable calculation of the power supply capacity of the medium-voltage power distribution system, that is, the maximum load that can be supplied under certain safety criteri...

AI Technical Summary

Problems solved by technology

The evaluation method based on the N-1 safety criterion leads to an excessive margin in the power supply capacity, simplifies the power supply reliability requirements of the distribution network to meet the rigid N-1 safety criterion, and fails to deeply analyze the power supply capacity of the distribution network under different reliability requirements trend of change

Images