Operating level and power supplying capability evaluation method for urban electric distribution network

Abstract

The invention belongs to the field of analysis on operation of an electric distribution network, and relates to an operating level and power supplying capability evaluation method for an urban electric distribution network. The method comprises the following steps of: based on point view of system engineering and own intensive property of index, clearing up and analyzing existing indexes relative to the operating level and the power supplying capability of the electric distribution network, constructing an electric distribution network operating level and power supplying capability evaluation index system by combining an improved analytic hierarchy process with a fuzzy evaluation method, selecting and design an evaluation index based on expert advice to determine an index range and a weight of the evaluation on the operating level and the power supplying capability of the electric distribution network, determining a rational range of an evaluation index, setting weight of each evaluation index, and finally providing flows and use methods of comprehensive evaluation on the operating level and the power supplying capability of the urban electric distribution network.

Description

technical field [0001] The invention belongs to the field of distribution network operation analysis and relates to a method for evaluating the operation level and power supply capacity of an urban distribution network. Background technique [0002] In order to adapt to the rapid development of the city, the transformation and expansion of the power grid has been carried out in an all-round way across the country, and the investment in equipment has been continuously increased. Therefore, the evaluation of the urban distribution network has become an urgent task, and the operation level and power supply capacity of the distribution network are measured The important criteria of the rationality, adequacy and flexibility of the distribution network frame can reflect the adaptability of the distribution network to the load development, and its accurate and reasonable evaluation will help make full use of the distribution network resources and guide the distribution network. Net...

AI Technical Summary

Problems solved by technology

However, at present, the proposal of urban distribution network construction and reconstruction plan and the determination of priority mostly rely on manual methods, and project decision-making has a certain degree of subjective randomness. However, in reality, batches of projects often work together, which leads to the blindness of power grid construction and transformation. This problem is particularly prominent in the construction and transformation of medium and low voltage distribution networks, resulting in a large waste of funds. There are still many problems in the power grid, which cannot well meet the requirements of the majority of users. One of the main reasons for this situation is the lack of systematic and scientific analysis and evaluation methods for the operation level and power supply capacity of the urban distribution network. The seriousness of the problem and the specific link of the problem cannot be given quantitatively

[0003] Among the current evaluation methods for power supply capacity, the capacity-load ratio method uses the variable capacity-load ratio that reflects the macroscopic power supply capacity of the urban power grid to represent the power supply capacity of the power grid. It can be used as an important indicator for evaluating the power supply capacity of the power grid, but it cannot be comprehensive and accurate. Evaluate the power supply capacity; the trial and error method depends on the rationality of the load distribution coefficient, the calculation process is cumbersome, and the variables of the system are influenced and restricted by each other, so the accuracy of the evaluation results is poor; the maximum and minimum load multiple method is based on the existing load of the network. The maximum and minimum load multiples that can be achieved are used to evaluate the power supply capacity of the network and the adaptability to load changes. The evaluation results are largely affected by the existing load distribution of the network; the network maximum flow method uses the method of network planning to Calculate the power supply capacity, easy to deal with complex constraints, suitable for solving the maximum power supply capacity of the local network

[0004] In terms of evaluating the operation level of the urban distribution network, a relatively complete comprehensive evaluation system has not yet been formed at home and abroad, and several indicators such as user power supply reliability, line loss rate, and voltage qualification rate are used to evaluate the operation of the urban distribution network. Level

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