A low-voltage single-phase power supply system from 10kv to 220v

Abstract

The invention discloses a low-voltage single-phase power supply system from 10kV to 220V. The system includes a three-phase-two-phase transformer connected in sequence from 10kV to 220V, an electric energy collection unit, an unbalance control unit, a reactive power control unit, and an AC- DC‑AC module, this application first uses the transformer to convert the three-phase voltage into two-phase voltage, and collects the electrical quantity by connecting the electric energy collection unit, and sends the collected electrical quantity to the unbalance control unit and the reactive power control unit, and the unbalance control unit The unit is used to monitor the current unbalance between the α phase and the β phase, the AC‑DC‑AC module regulates the two-phase current, the reactive power control unit is used to monitor the power, and the AC‑DC‑AC module regulates the current in the line The power is adjusted; compared with the power supply mode of single-phase transformer with two incoming lines, the power supply system provided by the present invention can solve the problem of three-phase unbalance on the 10kV side, and can greatly reduce the probability of three-phase current unbalance on the 220V side, reducing The capacity of the three-phase unbalance control device can reduce line loss and improve the quality of power supply.

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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