Three-phase load balancing device and method

Abstract

The invention discloses a three-phase load balancing device and method. The three-phase load balancing device comprises a phase detection module used for detecting an opening / closing state of a load switch of a phase where a to-be-switched load is located, a zero point detection module used for detecting a current zero point state and a voltage zero point state of the phase where the switched loadis located, and a controller connected with the phase detection module, the zero point detection module and the load switch of each phase, and used for, when the phase detection module detects that the load switch of the phase where the to-be-switched load is located is closed, controlling the load switch of the phase where the to-be-switched load is located to be opened in the current zero pointstate, and connecting the to-be-switched load to a switching phase line in the voltage zero point state. The state of the load switch can be accurately detected, so that the problems of interphase short circuit and load switch damage caused by no response of the load switch in a phase switching process of the load of a power grid are avoided.

Description

Technical field [0001] The invention relates to the technical field of power grid circuits, in particular to a three-phase load balancing device and method. Background technique [0002] In low-voltage power grids, the vast majority are three-phase four-wire power supply networks, and since most electrical equipment uses single-phase electricity, there are often three-phase load imbalances. The unbalance of the three-phase load will cause harm to the transformer and the power grid, and cause the output efficiency of the power supply transformer, damage to the transformer, and accelerated aging of the transmission line. Therefore, in the power grid, it is often necessary to dynamically balance the three-phase load of the transformer to maintain the relative balance of the three-phase load of the transformer, reduce the loss of line equipment, and ensure the safety of power equipment. The most effective way of load balancing is the load switch switching mode. At present, software ...

AI Technical Summary

Problems solved by technology

[0003] The embodiment of the present application provides a three-phase load balancing device and method, which solves the problems of phase-to-phase short circuit and load switch damage caused by the load switch not responding during the phase commutation balancing process of the grid load in the prior art, and realizes the Accurately detect the state of the load switch to avoid phase-to-phase short circuit of the load in the grid during the commutation process; switch phases of the load at the current zero point and voltage zero point state to avoid high voltage and high current conditions, resulting in excessive current or voltage at the moment of cut-in. Damage or damage to the load switch further ensures the safety and accuracy of load transfer

Images