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Treatment device and treatment method for low voltage caused by three-phase unbalance in distribution network terminal

A distribution network terminal and low-voltage technology, which is applied in the field of power systems, can solve the problems of low cost, achieve low cost, fast cost recovery, and reduce the inconvenience of using electricity

Active Publication Date: 2019-09-03
SHENYANG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above technical problems, the present invention provides a treatment device and treatment method for low voltage caused by three-phase unbalance in distribution network terminals. The present invention effectively solves the problem of low voltage caused by three-phase unbalance in distribution network terminals. , it does not involve reconstruction and transformation of the power grid, and the cost is low. Real-time monitoring of the power grid can be realized, and the load can be adjusted in real time according to the situation. It can be processed without delay and ensures the stable operation of uninterruptible loads

Method used

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Embodiment 1

[0023] Such as figure 1 As shown, the distribution network terminal of the present invention is a device for controlling low voltage caused by three-phase unbalance, and its structure is as follows: a voltage and current acquisition unit 1 connected to the home terminal for collecting the voltage and current value of each phase of the home, the voltage and current The acquisition part 1 is a voltage transformer and a current transformer, the output end of the voltage and current acquisition part 1 is connected to the voltage and current comparison part 2, the output end of the voltage and current comparison part 2 is connected to the control switching part 3, and the control switching part 3 is connected to the Three-phase load 4.

[0024] The above-mentioned home terminal is a three-phase voltage or a single-phase voltage, and the voltage-current comparison unit 2 is a current feedback operational amplifier and a voltage feedback operational amplifier. The switching control ...

Embodiment 2

[0028] Such as figure 2 As shown, the distribution network terminal of the present invention is a device for controlling low voltage caused by three-phase unbalance, and its structure is as follows: a voltage and current acquisition unit 1 connected to the home terminal for collecting the voltage and current value of each phase of the home, the voltage and current The acquisition part 1 is a voltage transformer and a current transformer. The output end of the voltage and current acquisition part 1 is connected to the voltage and current comparison part 2, the output end of the voltage and current comparison part 2 is connected to the control switching part 3, and the control switching part 3 is connected to the Unidirectional phase load5.

[0029] The above-mentioned home terminal is a three-phase voltage or a single-phase voltage, and the voltage-current comparison unit 1 is a current feedback operational amplifier and a voltage feedback operational amplifier. The switching...

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Abstract

The invention discloses a device and method for treating a condition that the three-phase imbalance of a distribution network terminal causes a low voltage, and belongs to the technical field of power systems. The device has the structure that a voltage and current collection part (1) which is used for collecting the voltage and current values of each home-entry phase is connected with a home-entry terminal; the output end of the voltage and current collection part (1) is connected with a voltage and current comparison part (2); the output end of the voltage and current comparison part (2) is connected with a control switching part (3); and the control switching part (3) is connected with a load. According to the invention, the device effectively solves a problem that the three-phase imbalance of the distribution network terminal causes the low voltage, does not refer to the reconstruction and reforming of a power grid, is low in cost, achieves the real-time monitoring of the power grid, can adjust the load in real time according to the conditions, achieves the no-delay processing, and guarantees the stable operation of a load which cannot be switched off.

Description

technical field [0001] The invention discloses a control device and a control method for low voltage caused by three-phase unbalance in a distribution network terminal, belonging to the technical field of power systems. Background technique [0002] With economic development and social progress, some technical problems in the distribution network, especially the problem of low voltage caused by the unbalanced three-phase load, have become more prominent. Technical problems that need to be solved urgently. [0003] At present, there are mainly the following methods to solve the three-phase imbalance in China: one is to upgrade the line, disperse the asymmetric load, and supply the asymmetric load in the power grid in a distributed manner, that is, to reconstruct the circuit according to the nature of the load, It can avoid serious unbalanced power grid caused by centralized connection of too many unbalanced loads. The process needs to collect relevant information, such as: t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/26
Inventor 王立地李二申孟晓芳王俊郭丹王慧李俐莹
Owner SHENYANG AGRI UNIV
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