A three-phase load balancing system for distribution network main and branch lines

Abstract

The invention discloses a three-phase load balancing system of main and branch lines of a distribution network. The system is composed of a main controller and a plurality of branch controllers. The main controller determines a phase adjustment pair and a main adjustment value based on an unbalanced load situation of a main line and selects and adjusts branch lines among all branch lines based onthe phase adjustment pair. All branch controllers mark commutation devices that do not provide power for load devices with built-in magnetic motion parts at the source phases of the adjusted branch lines, needed commutation devices are selected among the marked commutation devices, and then if the marked commutation devices are not sufficient, commutation devices are selected from unmarked commutation devices; and the sum of power loads of the selected commutation device of all adjusted branch lines is equal to the main adjustment value, access phases of the selected commutation devices are controlled to be switched to be target phases, so that loads of the main lines and the branch lines meet a balancing requirement. Therefore, a phenomenon that the load device with the built-in magneticmotion part of the user terminal makes commutation vibration and thus noises are caused is avoided and the system works stably.

Description

technical field [0001] The invention relates to a load balancing technology of a distribution network, in particular to a three-phase load balancing system for main and branch lines of a distribution network suitable for a low-voltage distribution network. The invention belongs to the technical field of power distribution of a low-voltage distribution network. Background technique [0002] The load of the low-voltage distribution network is generally composed of a mixture of three-phase loads and single-phase loads. Residential electricity is all single-phase loads, and the distribution network is relatively complicated. The size is different and the power consumption time is different. Therefore, the three-phase unbalanced condition of the distribution network is irregular and unpredictable in advance, which leads to the long-term unbalanced three-phase load of the distribution network. The Chinese patent application with application number 201510229756.8 discloses a power ...

AI Technical Summary

Problems solved by technology

The technical solution disclosed in the above-mentioned Chinese patent application does not consider the load characteristics of the load device it supplies when selecting the commutation device. For example, if the load device has a built-in magnetic moving part of the motor, when the phase is switched, the phase of the power supply changes suddenly, causing the magnetic moving part to be damaged. Commutation vibration and noise are generated, and the load device cannot operate stably

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