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

A power supply system, single-phase technology, applied in the direction of multi-phase network asymmetry reduction, multi-phase network elimination/reduction of asymmetry, reactive power compensation, etc., can solve three-phase load imbalance, line loss and other problems

Active Publication Date: 2019-01-11
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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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...

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

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Embodiment Construction

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0026] see figure 1 , is a schematic structural diagram of a 10kV to 220V low-voltage single-phase power supply system provided by an embodiment of the present invention. The system includes a three-phase-two-phase transformer 1 , an electric energy collection unit 2 , an unbalance control unit 3 , a reactive power control unit 4 and an AC-DC-AC module 5 connected in sequence.

[0027] Among them, the three-phase-two-phase transformer is used to convert the three-ph...

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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...

Claims

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Application Information

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IPC IPC(8): H02J3/26H02J3/18
CPCH02J3/18H02J3/26Y02E40/50
Inventor 郭成
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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