Power load balancing system applicable to distribution network

Abstract

The invention discloses a power load balancing system applicable to a distribution network. The power load balancing system comprises commutation devices and a control main station, wherein three-phase input ends of the commutation devices are electrically connected with the low-voltage distribution network and single-phase output ends are electrically connected with electric terminals; load information of the electric terminals are transmitted to the control main station; and the control main station carries out computing processing, determines the electric terminal requiring phase switchingin the phase with large total load information and a phase switching signal of the electric terminal switched into the phase with small total load information from the current phase and transmits thephase switching signal to the corresponding commutation device, and the commutation device switches an access phase, connected to the low-voltage distribution network, of the electric terminal according to the phase switching signal and redistributes load of the electric terminal, so that the load of the electric terminal is relatively uniformly distributed on three phases of the low-voltage distribution network. According to the power load balancing system, distribution of the load of each electric terminal among three phases is adjusted under the condition of continuous power supply, three-phase load balance of the low-voltage distribution network is achieved, the line loss is effectively reduced and the power supply quality is improved.

Description

[0001] This application is a divisional application of a patent application with the application number 201510229739.4, the application date is 2015-05-07, and the name is a patent application for a power load balancing system suitable for low-voltage distribution networks technical field [0002] 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 [0003] 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 differ...

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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