A low-voltage single-phase power supply system for 10 kV substation and 220 V power supply

Abstract

The invention discloses a low-voltage single-phase power supply system of 10 kV transformer and 220 V, which comprises 10 kV-220 V three-phase-to-two-phase transformer, an electric energy collection unit, an unbalance control unit, a reactive power control unit and an AC-DC-AC module connected in sequence At first, that three-phase voltage is convert into two-phase voltages by use a transformer, the electric quantity is collected by connected with an electric energy acquisition unit, and the collected electric quantity is sent to an unbalanced control unit and a reactive power control unit, the unbalanced control unit is used for monitoring the current unbalance degree between the alpha phase and the beta phase, and the AC-DC-AC module regulates the two-phase current, and the reactive power control unit is used to monitor the power, the AC-DC-AC module regulates the power in the circuit; Compared with the power supply mode of the two-inlet single-phase transformer, the power supply system provided by the invention can solve the three-phase unbalance problem of the 10kV side, greatly reduce the probability of the three-phase current unbalance of the 220V side, reduce the capacity ofthe three-phase unbalance treatment device, reduce the line loss, and improve the power supply quality.

Description

technical field [0001] The invention relates to the technical field of power supply, in particular to a low-voltage single-phase power supply system from 10kV to 220V. Background technique [0002] Three-phase alternating current (referred to as three-phase power): It is a form of transmission of electric energy. Three-phase AC power supply is a power supply composed of three AC potentials with the same frequency, equal amplitude, and 120° phase difference. There are many uses of three-phase alternating current, and the motor load in industry mostly adopts three-phase alternating current (three-phase four-wire system power supply). In daily life, most of them use single-phase power supply, so there is a contradiction between three-phase power supply and single-phase power consumption. In most cases (when powered by the electricity market grid), the single-phase power is obtained by using one phase of the three-phase power and the neutral line (zero line) of the three-phase...

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Problems solved by technology

[0004] This application provides a 10kV to 220V low-voltage single-phase power supply system to solve the problem of using a three-phase transformer in the single-phase power supply situation in the prior art with large capacity, short power supply radius, dense load distribution or linear distribution It will bring more serious three-phase load imbalance and serious line loss problems

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