Method for treating three-phase load imbalance of low-voltage distribution network

Abstract

The invention discloses a method for controlling unbalanced three-phase loads of a low-voltage distribution network. The method uses a station area controller to collect three-phase current data on the low-voltage side of a distribution transformer, load data of an outlet leakage protection switch, and user power consumption data. The load data and the current and phase data of the commutation switch are analyzed and calculated to obtain the unbalance value of each outgoing line. When the unbalance is found to be greater than the set limit value, and the unbalance maintenance time exceeds the set adjustment time In this case, the optimal "unbalance adjustment method" is given, and the phase change switch is automatically controlled by remote control to adjust the load and complete the redistribution of the three-phase loads of each outgoing line, so that the three-phase loads of each outgoing line are in a basically balanced state, so as to achieve low-voltage line The three-phase load balance state. The invention realizes the redistribution of the single-phase load current by controlling the phase change switch installed on the side of the household meter box, so as to achieve the basic balance of each phase load.

Description

Technical field [0001] The invention belongs to the field of electric power technology, and specifically relates to a method for managing three-phase load imbalance in a low-voltage power distribution network. Background technique [0002] The current status of the distribution station area is: the rural power grid project transformation is not only large in scale and heavy in tasks, but also in tight time and limited funds. It is impossible to cover everything, especially during the construction of the household connection line, due to some construction personnel The quality is low, and there is basically no concept of three-phase load balance. During the construction process, either the single-phase load is randomly connected, or the single-phase load is connected to the middle two wires. These all cause the three-phase load imbalance to a certain extent Some phase loads seem to be relatively close, and the phase currents are also relatively close, but the neutral current is ve...

AI Technical Summary

Problems solved by technology

[0015] The purpose of the present invention is to provide a method for controlling the unbalanced three-phase load of the low-voltage distribution network. By adjusting the current of each phase of the switch at the entrance of the household, the load of each phase is basically balanced, so as to fundamentally solve the problem of the distribution area. Three-phase load unbalance problem

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