Electrical-information-acquisition-system-based theoretical line loss estimation method for distribution network

Abstract

The invention discloses an electrical-information-acquisition-system-based theoretical line loss estimation method for a distribution network, and aims to overcome the shortcomings of great errors of the conventional theoretical line loss estimation method for the distribution network, difficulty in accurate analysis on the characteristics of load fluctuation, unbalance, harmonic distortion, parameter variation and the like of the distribution network, and the like. By the method, each loss influencing factor of a medium and low voltage distribution network can be scientifically, perfectly and comprehensively reflected; and compared with a 'root-mean-square current method', an 'average current method', a 'maximum current method', an 'equivalent resistance method' and the like for estimating line loss only according to the single line diagram of the distribution network, typical day 24 hours, asynchronous current recording data and the like in DL686-1999 guide of calculation of grid energy loss, the invention has more accurate algorithms, parameters, load data and the like for the theoretical line loss, and provides a novel concept and a novel method for the loss analysis and energy efficiency evaluation of the distribution network.

Description

technical field [0001] The invention is based on the periodic and accurate measurement data of "full coverage and full collection" of the power consumption information collection system, and relates to the field of theoretical line loss calculation of power system distribution network, and specifically relates to the distribution network theory based on the power consumption information collection system Line loss assessment method. Background technique [0002] The theoretical calculation of distribution network line loss is to calculate the actual active power loss of each component in the distribution network and the power loss within a certain period of time based on the actual load and normal operation mode of the distribution network. Through the calculation of theoretical line loss, the economy of distribution network structure and operation mode can be identified, the components with excessive loss in the power grid and their causes can be identified, and whether the...

AI Technical Summary

Problems solved by technology

Disadvantages are: different selection of representative days will have different calculation results, and the calculation error is large

The disadvantage is: for distribution transformers without actual measurement records, the shape factor is not easy to determine, and the calculation error is large

The disadvantages are: the loss factor is not easy to calculate, different load curves, network structures and load characteristics, the calculated loss factor is different, and cannot be used universally. When using this method, the loss factor must be calculated according to the actual situation of the power grid; the calculation accuracy is low, and it is often used for calculation accuracy undemanding situations

The disadvantages are: it is necessary to assume the calculation conditions, which affects the accuracy of the calculation results; for distribution transformers without actual load records, it is assumed that the load distribution is proportional to the rated capacity of the distribution transformer, and the load rate of each node is the same. This calculation does not fully conform to the actual load. situation; assuming that the power factor, shape factor and voltage of each load point are the same, but in general, the power factor, load factor and operating voltage of each load point in the actual system are different, and the calculated power loss value has a large error

[0042] The different evaluation methods used lead to inconsistencies in the calculation results, and a large gap with the actual line loss value, which will cause certain misunderstandings in the analysis of energy saving and loss reduction in distribution networks.

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