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Low-voltage distribution network line loss calculation model and method

A low-voltage distribution network and calculation model technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as insufficient flexibility in line loss calculation, and inability to accurately evaluate the quantification of the influence factor of distribution network line loss. Simple model method, high model applicability and high precision

Active Publication Date: 2019-03-19
CHINA ELECTRIC POWER RES INST +3
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Problems solved by technology

[0005] The purpose of the present invention is to provide a low-voltage distribution network line loss calculation model and method to solve the problems in the prior art that the line loss calculation is not flexible enough and cannot accurately evaluate the quantification degree of the distribution network line loss influencing factors.

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  • Low-voltage distribution network line loss calculation model and method
  • Low-voltage distribution network line loss calculation model and method
  • Low-voltage distribution network line loss calculation model and method

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Embodiment 1

[0040] In this embodiment, a low-voltage distribution network line loss calculation model is disclosed, which is used to calculate the line loss of ordinary low-voltage lines in the low-voltage distribution network within the measurement interval time.

[0041] The low-voltage distribution network line loss calculation model disclosed in this embodiment is based on the characteristics of the typical grid structure of the low-voltage distribution network and the classification of loads. From the perspective of load power consumption, it is mainly single-phase power loads and three-phase power loads. In the existing metering situation, monitoring meters are added at key nodes, and the equivalent fundamental wave impedance of the line is obtained from the subsequent branch lines iteratively, and a low-voltage line impedance model is constructed. Based on the metering data, a low-voltage disturbance model is constructed, and the disturbance amount and disturbance type of each phase...

Embodiment 2

[0103] The difference between this embodiment and Embodiment 1 is that the low-voltage line in this embodiment is a low-voltage line containing new energy. When calculating the line loss of a low-voltage line containing new energy, since the new energy power generation It will have an impact on the power disturbance of the low-voltage line, mainly due to the influence of the fundamental wave of the phase line. Therefore, compared with the ordinary low-voltage line in Embodiment 1, the process of obtaining the equivalent impedance is exactly the same, and the difference lies in the equivalent current of the power disturbance. The acquisition process makes the calculation process of line loss different.

[0104] In the present invention, the influence of power disturbance on line loss in low-voltage lines containing new energy is proposed for the first time, and it is also the first time that the power disturbance in low-voltage lines containing new energy is obtained by equivale...

Embodiment 3

[0168] In this embodiment, a method for calculating line loss of a low-voltage distribution network is disclosed, which is used for calculating the line loss of common low-voltage lines in a common low-voltage distribution network within a measurement interval.

[0169] The calculation method is performed according to the following steps:

[0170] Step 1. Obtain the equivalent impedance of the ordinary low-voltage line within the measurement interval time. The equivalent impedance of the ordinary low-voltage line includes the fundamental equivalent impedance of each phase line in the ordinary low-voltage line, the harmonic of each phase line in the ordinary low-voltage line Wave equivalent impedance, common low-voltage line neutral zero-sequence fundamental wave equivalent impedance and common low-voltage line neutral harmonic equivalent impedance;

[0171] Optionally, in step 1, when obtaining the equivalent impedance of a common low-voltage line,

[0172] Step 1.1, using fo...

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Abstract

The invention discloses a low-voltage distribution network line loss calculation model and method which are used for calculating line loss of a common low-voltage line in a low-voltage distribution network and a low-voltage line containing new energy in a metering interval. the calculation model comprises a low-voltage line power data obtaining module, a low-voltage line equivalent impedance obtaining module, a low-voltage line disturbance quality equivalent current obtaining module and a line loss calculation module; the low-voltage distribution network line loss calculation model and methodprovided by the invention adopt a mode of iteration from a backward stage branch circuit forwards to obtain a low-voltage line phase line and the impedance of fundamental frequency and harmonic impedance of a middle line, the precision is high, and the modeling method is simple; and moreover, the low-voltage distribution network line loss calculation model and method consider disturbance influencefactors of three-phase unbalance, harmonic waves, voltage fluctuation and new energy access on the loss, are high in model applicability, can research the influence of the single electric energy disturbance and can research the complex disturbance influence of a plurality of electric energy qualities.

Description

technical field [0001] The invention relates to a line loss calculation model and method, in particular to a low-voltage distribution network line loss calculation model and method. Background technique [0002] How to control the line loss rate of distribution network is an effective measure to improve the economic benefits of electric power enterprises. The effectiveness of the distribution network line loss calculation method can provide a theoretical basis for line loss assessment and a solution for line loss management. The theoretical line loss calculation of the low-voltage distribution network mainly includes the loss of the distribution transformer and the line loss of the 0.4kV low-voltage distribution line. Low-voltage distribution line loss from the low-voltage outlet of the transformer to the user line and the power consumption of metering instruments on the line. For high-voltage power grids of 35kV and above, due to their relatively clear structure, relativel...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 孟珺遐蒋利民王毅代双寅白士贤
Owner CHINA ELECTRIC POWER RES INST
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