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Emergency regulation system for three-phase power imbalance

A technology for regulating systems and three-phase electricity, applied in the direction of reducing the asymmetry of polyphase networks, eliminating/reducing asymmetry in polyphase networks, etc. Balance problem, improve the effect of three-phase electrical imbalance

Active Publication Date: 2020-06-02
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the power quality problem on the user side has been solved, the three-phase terminal voltage imbalance problem of the power grid has not been alleviated at the input end of the power system

Method used

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  • Emergency regulation system for three-phase power imbalance

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Embodiment Construction

[0020] The present invention is described in further detail below:

[0021] see figure 1 , an emergency adjustment system for three-phase electrical unbalance, comprising a grid input unit, a DC battery unit, an AC output unit, a control unit, and a signal acquisition unit;

[0022] The grid input unit includes an input contactor KM1, an AC fuse FU1, a direct supply contactor KM2, and a load contactor KM4.

[0023] The electric DC battery unit includes a single-phase controllable rectifier S1, a filter reactor T1, a filter capacitor C1, an isolation diode D1, a DC switch K1, a DC fuse FU2, and a battery pack;

[0024] The AC output unit includes a three-phase full-bridge inverter S2, a filter reactor T2, and an output contactor KM3;

[0025] The signal acquisition unit is respectively connected with the voltage monitoring terminal P1 of the grid input circuit, the voltage and current monitoring terminal P2 of the battery pack, and the voltage and current monitoring terminal ...

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Abstract

The invention discloses an emergency regulation system for three-phase power imbalance. The emergency regulation system comprises a power grid input unit, a direct-current battery unit, an alternating-current output unit, a control unit and a signal acquisition unit, wherein the power grid input unit comprises an input contactor, an alternating-current fuse, a direct supply contactor and a load contactor; the electric direct-current battery unit comprises a single-phase controllable rectifier, a filter reactor, a filter capacitor, an isolation diode, a direct-current switch, a direct-current fuse and a battery pack; the alternating-current output unit comprises a three-phase full-bridge inverter, a filter reactor and an output contactor; the signal acquisition unit is connected with the voltage monitoring end of the power grid input circuit, the voltage and current monitoring end of the battery pack and the voltage and current monitoring end of the three-phase full-bridge inverter; andthe control unit is used for controlling the closing and opening of the corresponding contactors and switches by analyzing signals of the signal acquisition unit and outputting signals to the single-phase controllable rectifier and the three-phase full-bridge inverter so as to carry out control.

Description

technical field [0001] The invention relates to the field of power supply quality, in particular to an emergency adjustment system for unbalanced three-phase electricity. Background technique [0002] Power quality is one of the main concerns in the field of power systems, especially the unbalanced three-phase terminal voltage is the key to power supply quality. It not only has an important impact on high-tech equipment related to automation, advanced control, and online services, but also Exacerbate the load on the grid throughout the region. Patent application CN110071572A "a bidirectional charging and discharging integrated emergency power supply device" is used at the user end in case of abnormal bypass power supply, the energy is provided by the DC battery, and the standard three-phase AC voltage is obtained through the emergency power inverter to supply power to important loads. Although the power quality problem on the user side has been solved, the three-phase termi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26
CPCH02J3/26Y02E40/50
Inventor 王喜刚魏璐刘玉奇樊秦华苏苗苗杨瑾冯浩贤侯梦瑾刘雯佳王延军孙顺顺樊刚张帆
Owner STATE GRID CORP OF CHINA
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