Medium and low voltage power distribution network comprehensive evaluation method based on reliability

Abstract

The present invention discloses a medium and low voltage power distribution network comprehensive evaluation method based on reliability. By establishing the restraint layer indexes based on reliability and determinacy criterions and a hierarchical index system of the comprehensive evaluation indexes integrating the economy, the reliability, the electric energy quality and the expansibility as one, a power distribution network planning scheme is firstly carried out the restraint layer evaluation to guarantee the reliability level of the power distribution network planning scheme, and then the power distribution network planning scheme having the optimal comprehensive level is determined on the basis of guaranteeing the reliability level of the power distribution network planning scheme. The medium and low voltage power distribution network comprehensive evaluation method based on the reliability is especially suitable for evaluating a medium and low voltage power distribution network focusing on the reliability level.

Description

technical field [0001] The invention relates to a reliability-based comprehensive evaluation method for medium and low voltage distribution networks. Background technique [0002] Since the urban medium and low-voltage distribution network is at the end of the entire power system and directly faces users, scientific and reasonable planning and evaluation of the distribution network is an important part of the overall planning of the power grid. A reasonable evaluation of the distribution network requires the construction of a reasonable evaluation index system and process and the application of accurate and efficient evaluation methods. [0003] Conventional distribution network evaluation index system includes reliability, economy, security and other indicators, but usually only the probabilistic indicators that reflect reliability are considered in the evaluation of reliability, and the deterministic indicators that affect reliability are not analyzed. For example, grid s...

AI Technical Summary

Problems solved by technology

At present, DEA is rarely used in the power field. Although some people have introduced the DEA method into the evaluation field of power supply schemes, it is usually only a CCR model, which does not reflect the preferences of decision makers and does not limit the weight coefficients of input and output indicators, and the traditional CCR There are two deficiencies in the application of the model in practical problems: first, multiple DMUs may be valid at the same time, the more the number of DMUs, the more obvious the phenomenon of DMUs being valid at the same time, and the traditional DEA method cannot further improve the effectiveness of multiple DMUs. Sorting; in addition, if the input and output index data of the DMU are too disparate, the DEA model will mistake some DMUs as valid because of the emphasis on a small number of indicators

The cross-efficiency evaluation is to avoid the defect of self-evaluation by evaluating the efficiency value of each DMU N times. At present, there is no research that combines the CCR model with constraint cones and cross-efficiency in the evaluation of distribution network planning schemes.

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