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Three-phase imbalance treatment device switching strategy optimization method based on linear programming

A technology of linear programming and optimization method, applied in circuit devices, multiphase network elimination/reduction asymmetry, multiphase network asymmetry reduction, etc. and other problems, to achieve the effect of reducing the three-phase unbalance, avoiding the problem of combined explosion, and shortening the calculation time.

Pending Publication Date: 2022-03-04
浙江省长兴电气工程有限公司 +2
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Problems solved by technology

The low-voltage distribution network has a complex structure, covers a wide range of users, and has many types. It is affected by various factors, and there are a large number of single-phase users, which is prone to unbalanced three-phase power loads.
The three-phase imbalance will cause a series of adverse effects. Firstly, due to the unbalanced load distribution, the quality of the user's power supply will decline. Secondly, it will affect the normal operation of the power supply equipment and shorten the service life. In addition, it will cause many problems such as line loss.
The low-voltage load automatic phase change device can be used to control the three-phase unbalance, and can automatically adjust the three-phase load according to the unbalance degree without interrupting the user's power supply, overcoming the traditional shortcomings of relying on manual rerouting to adjust the three-phase unbalance

Method used

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  • Three-phase imbalance treatment device switching strategy optimization method based on linear programming
  • Three-phase imbalance treatment device switching strategy optimization method based on linear programming
  • Three-phase imbalance treatment device switching strategy optimization method based on linear programming

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Embodiment Construction

[0048] In order to better understand the purpose, technical solution and technical effect of the present invention, the present invention will be further explained below in conjunction with the accompanying drawings.

[0049] refer to figure 1 , figure 1 Shown is a specific linear programming-based switching strategy optimization method for three-phase unbalance control devices, including the following steps:

[0050] S10, constructing an objective function for device switching strategy optimization:

[0051]

[0052] In the formula: X∈{A,B,C} is the user phase matrix before handover, is the user phase vector after handover, N is the total number of users, and t is the moment of handover.

[0053] S20, Construct the phase unique constraint of three-phase unbalance governance:

[0054]

[0055] In the formula: It represents the phase variable of user n at time t after governance. After governance, the variable of the phase to which the user belongs takes 1, and t...

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Abstract

The invention relates to a three-phase imbalance governance device switching strategy optimization method based on linear programming. The method comprises the following steps: constructing a three-phase imbalance governance objective function; constructing a phase constraint of three-phase imbalance treatment for the target function; constructing security constraints of three-phase imbalance treatment for the target function, wherein the security constraints comprise constraints on user current and three-phase imbalance degree; and performing phase constraint and security constraint on the target function to form the three-phase imbalance governance device switching strategy optimization method based on linear programming. According to the method, support can be provided for transformer area three-phase imbalance treatment based on the commutation devices, the three-phase imbalance degree is effectively reduced, compared with a traditional treatment method according to experience, the method is more accurate, and the number of switching times of the commutation devices can be reduced as much as possible while three-phase imbalance is treated; compared with an exhaustion method, the calculation complexity is reduced from index complexity to polynomial complexity, the problem of combinatorial explosion is avoided, and the calculation time is greatly shortened.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a linear programming-based switching strategy optimization method for three-phase unbalance control devices. Background technique [0002] With the development of economy and society, the topological structure of low-voltage power distribution network presents a trend of becoming more and more complicated. The low-voltage distribution network has a complex structure, covers a wide range of users, has many types, is affected by various factors, and there are a large number of single-phase users, which is prone to unbalanced three-phase power loads. The three-phase imbalance will cause a series of adverse effects. Firstly, due to the unbalanced load distribution, the quality of power supply for users will decline. Secondly, it will affect the normal operation of power supply equipment and shorten the service life. In addition, it will cause many problems such as line loss. [0003] Wi...

Claims

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Application Information

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IPC IPC(8): H02J3/26
CPCH02J3/26H02J2203/10H02J2203/20Y02E40/50
Inventor 吕斌斌王国帮范津津朱恋秦中才闻俊义邵力张明乐韦耀刘腾柱林振智李家桥刘晟源
Owner 浙江省长兴电气工程有限公司
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