Power load balancing system applied to low-voltage power distribution network

Abstract

The invention discloses a power load balancing system applied to a low-voltage power distribution network. The device includes phase conversion devices and a control master station; three-phase input ends of the phase conversion devices are electrically connected with the low-voltage power distribution network; single-phase output ends of the phase conversion devices are electrically connected with electricity consumption terminals, so that the load information of the electricity consumption terminals can be transmitted to the control master station; the control master station performs computation processing, and determines electricity consumption terminals which are on phases with large total load information and require phase switching, and phase switching signals which enable the electricity consumption terminals to switch to phases with small total load information from the current phases, and transmits the phase switching signals to corresponding phase conversion devices; and the phase conversion devices switch the electricity consumption terminals and make the same connected into connection phases of the low-voltage power distribution network according to the phase switching signals, so that the load of the electricity consumption terminals can be re-distributed, and therefore, the load of the electricity consumption terminals can be uniformly distributed on the three phases of the low-voltage power distribution network. With the power load balancing system applied to the low-voltage power distribution network of the invention adopted, the distribution of the load of the electricity consumption terminals between three phases can be adjusted with continuous power supply ensured, and the three-phase load balance of the low-voltage power distribution network can be realized, and line loss can be effectively reduced, and power supply quality can be improved.

Description

technical field [0001] The invention relates to a three-phase load balancing technology of a low-voltage distribution network, in particular to a power load balancing system that realizes three-phase load balancing of a low-voltage distribution network by dynamically adjusting the load between the three phases of the low-voltage distribution network. The invention belongs to low-voltage power distribution Network power distribution technology field. Background technique [0002] As we all know, the load of the distribution transformer of the low-voltage distribution network is generally composed of a mixture of three-phase load and single-phase load. Power distribution system, and the load size is different and the power consumption time is different. Therefore, the current imbalance between the three phases in the low-voltage distribution network exists objectively, and this power consumption imbalance is irregular and cannot be predicted in advance. It is one of the main ...

AI Technical Summary

Problems solved by technology

In the three-phase four-wire power supply system, the distribution of three-phase loads is uneven, and the use of loads is asynchronous and random, which causes the distribution transformer to be in an unbalanced operation state of three-phase loads all the time.

For example, foreign countries use advanced electronic technology to convert the unbalanced three-phase current through a series of AC → DC → AC, and then obtain a stable voltage, stable frequency, and stable phase AC, which is equivalent to a three-phase motor driving a three-phase Although the generator can eliminate the unbalanced current of the corresponding power grid, it is expensive and expensive, and the harmonic pollution is serious, and it is only suitable for some special small areas at present.

In China, there is a single-phase capacitor split-phase reactive power compensation system to compensate the load, which can compensate the reactive current part, but can't do anything about the asymmetrical active current part. Sometimes the vector of the three-phase current can be asymmetrical, and the neutral line There is still a considerable amount of current flowing on the ground, and because the single-phase load changes randomly, the neutral point displacement is still prominent, and the effect is not ideal.

Therefore, the power supply department can only adjust the load by manual branching, which will affect the normal power supply

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