Method for evaluating current three-phase unbalance degree of distribution network

An evaluation method and technology of balance degree, applied in the field of evaluation of three-phase unbalance degree of distribution network current, can solve problems such as increased loss, uneven load of each phase, loss, etc., to avoid objectivity, accurate and objective evaluation results, improve The effect of scientific rationality

Active Publication Date: 2016-10-26
STATE GRID TIANJIN ELECTRIC POWER +1
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Problems solved by technology

In the actual distribution network three-phase AC system, due to the uneven load of each phase, these unbalanced currents will not only cause losses on the phase lines, but also cause losses on the neutral line, increasing the total loss
Therefore, it is proposed to use the magnitude of the current three-phase unbalance to analyze and evaluate the load balance

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  • Method for evaluating current three-phase unbalance degree of distribution network
  • Method for evaluating current three-phase unbalance degree of distribution network
  • Method for evaluating current three-phase unbalance degree of distribution network

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[0023] The embodiments of the present invention are described in further detail below:

[0024] A method for evaluating the three-phase unbalance of distribution network current includes the following steps:

[0025] Step 1. Use the BP neural network algorithm to correct the mutation data of the three-phase current acquisition data of the three-phase AC system of the distribution network;

[0026] The specific steps of step 1 include:

[0027] (1) Establish a three-phase AC power system model for the distribution network;

[0028] (2) Construct a suitable BP neural network through the training of the historical data of the three-phase current of the distribution network;

[0029] (3) Initialize the BP neural network, and input the three-phase current acquisition data into the BP neural network for training until the error is reduced to meet the expected requirements, and then achieve the purpose of mutation data correction on the three-phase current acquisition data.

[0030] Step 2. Acco...

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Abstract

The invention relates to a method for evaluating the current three-phase unbalance degree of a distribution network. The method is characterized by comprising the following steps of: (1), performing mutation data correction of three-phase current acquired data of a three-phase alternating-current system of the distribution network by adopting a BP neural network algorithm; (2), according to the corrected three-phase current acquired data of the distribution network, respectively selecting maximum load days as typical days in workdays and non-workdays in every month so as to obtain three-phase current acquired data of the distribution network of 24 typical days in one year; (3), respectively evaluating the current three-phase unbalance degree of the distribution network in 24 typical days; and (4), calculating an average value of the current three-phase unbalance degree of the distribution network in 24 typical days in one year so as to obtain the current three-phase unbalance degree of the distribution network in one year. According to the method disclosed by the invention, when the current three-phase unbalance degree of the distribution network is calculated, multiple variable factors, such as seasons, workdays and current values at different times in one day, are comprehensively considered; and thus, the evaluation result is more accurate and objective.

Description

technical field [0001] The invention relates to the technical field of distribution network operation, in particular to an evaluation method for three-phase unbalance degree of distribution network current. Background technique [0002] In an ideal distribution network three-phase AC power system, the three-phase current should have the same magnitude, so that the neutral wire in the distribution network three-phase AC system will not flow current and will not cause loss on the neutral wire. In the actual distribution network three-phase AC system, due to the uneven load of each phase, these unbalanced currents will not only cause losses on the phase lines, but also cause losses on the neutral line, increasing the total loss. Therefore, it is proposed to use the magnitude of the current three-phase unbalance to analyze and evaluate the load balance. However, the existing evaluation methods for the current three-phase unbalance cannot effectively solve the problems of load se...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 张亮李涛王玉君刘荣浩吴绍卿李向征王海波计会鹏
Owner STATE GRID TIANJIN ELECTRIC POWER
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