A Calculation Method for Theoretical Line Loss of Low-Voltage Distribution Network

Abstract

The invention provides a method for calculating theoretical line loss of a low voltage distribution network. The method comprises the following steps: firstly, selecting a typical low voltage area atwill, and constructing a network topology structure of the typical low voltage area; secondly, acquiring current, voltage, the total active power, the total reactive power and a phase angle on the hour of each branch in the network topology structure; thirdly, calculating phase line loss and middle line loss of each branch; fourthly, calculating phase line additional loss and middle line additional loss which are produced by k-th harmonic in each branch; and fifthly, calculating phase line equivalent resistance and middle line equivalent resistance in the network topology structure of the constructed typical low voltage area, thus line loss of the typical low voltage area can be obtained. The method provided by the invention considers influence of three typical electric energy quality factors with a great influence on line loss calculation, actually measures load data according to a representative day and calculates the theoretical line loss of the area by adopting a way of pushing a later stage forward, thereby giving consideration to calculation accuracy and engineering practicability.

Description

technical field [0001] The invention belongs to the technical field of theoretical line loss calculation of a distribution network, in particular to a method for calculating the theoretical line loss of a low-voltage distribution network. Background technique [0002] Reducing the line loss rate of the distribution network is an effective measure to improve the economic benefits of power companies. The accuracy of the theoretical calculation of line loss can make it more objectively reflect the loss of the distribution network, so as to manage the line loss of the distribution network more effectively and more economically. Operate the distribution network. According to the voltage level of the distribution network, the theoretical line loss calculation methods are roughly divided into three categories. One is the theoretical line loss calculation of 10kV (20kV) medium voltage distribution network, which mainly includes distribution line loss and distribution transformer los...

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Problems solved by technology

[0013] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a theoretical line loss calculation method for low-voltage distribution networks, which solves the deviation of calculation results caused by the fact that the prior art does not fully consider the steady-state power quality factors that affect line loss big technical problem

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