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

Abstract

The invention discloses a power load balancing method and device for a low-voltage power distribution network. According to the method, the distribution condition of the load of electricity utilization terminals on three-phase lines of the low-voltage power distribution network is monitored in real time; when the distribution of the load of the electricity utilization terminals on the three-phase lines is uneven, and three-phase load unbalance is brought about; and the distribution of the load of the electricity utilization terminals between three phases of the low-voltage power distribution network is automatically adjusted, so that the load of the electricity utilization terminals can be evenly distributed on the three-phase lines, and therefore, three-phase load balance of the low-voltage power distribution network can be realized. The device includes phase conversion devices and a control master station; the phase conversion devices are arranged user ends; the electricity utilization terminals are connected into the low-voltage power distribution network through the phase conversion devices; and the control master station is used for dynamically controlling phase connection of the phase conversion devices, so that the load of the electricity utilization terminals can be evenly distributed on the three-phase lines of the low-voltage power distribution network. With the power load balancing method and device of the invention adopted, the load connected into the low-voltage power distribution network can be re-distributed on each phase 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 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 method for a low-voltage distribution network that is used 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 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 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 equipment of the po...

AI Technical Summary

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.

Therefore, the power supply department often can only adjust the load by manual branching, which affects the continuous power supply.

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