Three-phase load unbalance adjustment method and device and distribution transformer side monitoring equipment

Abstract

The invention relates to a three-phase load imbalance adjustment method and device, distribution transformer side monitoring equipment, a three-phase load imbalance adjustment system and a storage medium. The method comprises the following steps that: the phase current of each phase line on the outgoing line side of a distribution transformer and the current of each branch are acquired, and the current three-phase unbalance degree iscalculated according to the phase current of each phase line; if the condition that the current three-phase unbalance degree meets an adjustment condition, an optimal target load branch is determined according to the minimum value in the pre-judged three-phase unbalance degree, and a current commutation instruction is generated according to a commutation mode corresponding to the optimal target load branch, the pre-judged three-phase unbalance degree refers to the three-phase unbalance degree which is obtained after each target load branch is connected to the phase line with the minimum phase current in a commutation mode and is calculated according to the phase current of each phase line and the current of each branch. With the method adopted, excessive commutation in a three-phase load imbalance adjustment process can be avoided, so that the service lives of a commutation switch and electric equipment are prolonged.

Description

technical field [0001] The present application relates to the technical field of power system control, in particular to a three-phase load unbalance adjustment method, device, distribution transformer side monitoring equipment, three-phase load unbalance adjustment system and a storage medium. Background technique [0002] Due to the unbalanced temporal and spatial distribution of single-phase loads in the low-voltage station area and continuous uncontrollable capacity increase, the three-phase current or voltage amplitude or phase is inconsistent, and the degree of inconsistency exceeds the specified range, making the line often in unbalanced three-phase load state, which will bring many problems, such as increasing the loss of transformers and transmission lines, reducing the service life of transmission lines and switches and the efficiency of three-phase motors, easily causing false start of relay protection and automatic devices, increasing the Non-characteristic harmon...

AI Technical Summary

Problems solved by technology

[0002] Due to the unbalanced temporal and spatial distribution of single-phase loads in the low-voltage station area and continuous uncontrollable capacity increase, the three-phase current or voltage amplitude or phase is inconsistent, and the degree of inconsistency exceeds the specified range, making the line often in unbalanced three-phase load state, which will bring many problems, such as increasing the loss of transformers and transmission lines, reducing the service life of transmission lines and switches and the efficiency of three-phase motors, easily causing false start of relay protection and automatic devices, increasing the Non-characteristic harmonics of the converter, electrical noise interference affecting the normal operation of the computer system, etc.

[0003] At present, for the control of three-phase load imbalance, the three-phase load imbalance control method based on genetic algorithm is usually used, which has the characteristics of high precision and less initial information requirements, but this method will lead to three-phase load imbalance Too many commutation times during the adjustment process, which will affect the life of the commutation switch and electrical equipment

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