A power load balancing method and device suitable for low-voltage distribution network

Abstract

The invention discloses a power load balancing method and device applicable to a low-voltage power distribution network. The device includes phase conversion devices and a control master station; built-in acquisition modules of the phase conversion devices acquire load information connected into each electricity consumption terminal of the low-voltage power distribution network, and transmit the load information to the control master station; the control master station performs computation processing on the load information so as to obtain total load information and three-phase load unbalance degree which are connected into each phase of the low-voltage power distribution network; when three-phase load unbalance occurs, the phase conversion devices transmit phase switching signals, and switch the electricity consumption terminals and make the same connected into the 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 uniformly distributed on the three phases of the low-voltage power distribution network, and therefore, three-phase load balance of the low-voltage power distribution network can be realized. With the power load balancing method and device of the invention adopted, the load of the electricity consumption terminals can be automatically adjusted between each phase of the low-voltage power distribution network with reliable and 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 present invention relates to a three-phase load balancing technology of a low-voltage distribution network, in particular to a low-voltage distribution network power load balancing method suitable for dynamic adjustment of three-phase loads of a low-voltage distribution network to realize three-phase load balancing of a low-voltage distribution network. And a power negative balance device suitable for a low-voltage distribution network for realizing the method, and the invention belongs to the technical field of power distribution of a low-voltage distribution network. Background technique [0002] As we all know, the unbalanced three-phase current load of the low-voltage distribution network has always been one of the main problems that plague the power supply unit. The safety and reliability of the low-voltage distribution network directly affect the production and life of power users, and also affect the distribution network power supply equipmen...

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Problems solved by technology

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.

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