Low-voltage three-phase-imbalance adjusting equipment and power supply system thereof

Abstract

The invention discloses low-voltage three-phase-imbalance adjusting equipment and a power supply system thereof. The low-voltage three-phase-imbalance adjusting equipment comprises a central control device and is characterized in that the input end of the central control device is electrically connected with a three-phase electric quantity meter, and the three-phase electric quantity meter is parallelly connected into a power grid; the central control device is connected with a DSP chip, a drive module for driving a three-phase adjusting unit and a communication module, the three-phase adjusting unit comprises a plurality of separated adjusting units parallelly connected into the power grid, each separated adjusting unit comprises a main contactor K, an LC filter and eight switch module four-leg inverters, each main contactor K is electrically connected with the drive module, and the performance of the LC filter in the separated adjusting unit close to a transformer is larger than thatof the LC filters in the rest of the separated adjusting units. The low-voltage three-phase-imbalance adjusting equipment and the power supply system thereof have the advantages that the transformerand the low-level-configuration secondary side power grid can be monitored in real time, voltage excursion brought by three phase imbalance is lowered, reactive current loss is reduced, and power factor is increased.

Description

technical field [0001] The invention is patented in the field of electric power, and specifically relates to a low-voltage three-phase unbalance adjustment device and a power supply system thereof. Background technique [0002] In the low-voltage distribution network, the unbalanced current of three-phase electricity is ubiquitous. Due to the existence of a large number of single-phase loads in urban civil power grids and agricultural power grids, the current imbalance between the three phases is particularly serious. When the current between the three phases in the power supply system is unbalanced, the unbalanced current will increase the copper loss of the line and transformer, increase the iron loss of the transformer, reduce the output of the transformer and even affect the safe operation of the transformer, resulting in unbalanced three-phase voltage and thus reducing power supply The quality will even affect the accuracy of the energy meter and cause measurement loss....

AI Technical Summary

Problems solved by technology

When the current between the three phases in the power supply system is unbalanced, the unbalanced current will increase the copper loss of the line and transformer, increase the iron loss of the transformer, reduce the output of the transformer and even affect the safe operation of the transformer, resulting in unbalanced three-phase voltage and thus reducing power supply Quality, and even affect the accuracy of the energy meter and cause measurement loss

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