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Three-phase load automatic equalization device of power distribution network

An automatic balancing and three-phase load technology, which is applied in the direction of reducing the asymmetry of the multi-phase network, eliminating/reducing the asymmetry of the multi-phase network, etc., can solve the problems of shutdown of power consumption units, delay of normal production, time-consuming and labor-intensive problems, etc. The effect of long service life, reducing line loss and convenient construction

Inactive Publication Date: 2008-05-14
HEILONGJIANG ZHONGXING SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the problems existing in the existing distribution network three-phase load balance adjustment method that it can only make the distribution network tend to be three-phase balanced, which takes time and effort, and the required adjustment of the power consumption unit needs to stop work and delay normal production. A three-phase load automatic balancing device for distribution network

Method used

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  • Three-phase load automatic equalization device of power distribution network
  • Three-phase load automatic equalization device of power distribution network
  • Three-phase load automatic equalization device of power distribution network

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specific Embodiment approach 1

[0006] Specific embodiment 1: Referring to Figure 1, this embodiment consists of a master controller 1, a slave controller 2, a voltage detection module 3, a current detection module 4, an electric energy metering module 5, an interface level conversion module 6, and a voltage zero-crossing detection module 7. The solid state relay 9, the first rectifier 10, the first inverter 11, the grid-connected module 13, the power module 14 and the voltage conversion module 15 are composed, and the four input terminals of the voltage detection module 3 are respectively connected with A, Phases B, C and N are connected, the output terminal of the voltage detection module 3 is connected to the voltage detection input terminal of the electric energy metering module 5, and the four input terminals of the current detection module 4 are respectively connected to phases A, B, C and N of the three-phase distribution network connected, the output end of the current detection module 4 is connected ...

specific Embodiment approach 2

[0012] Specific embodiment two: Referring to Fig. 2, this embodiment adds an overcurrent protection module 8 on the basis of the specific embodiment one, and the four input terminals of the overcurrent protection module 8 are respectively connected to A, B, C and A of the three-phase distribution network. N-phase connection, the control input terminal of the overcurrent protection module 8 is connected with the overcurrent protection control output terminal of the slave controller 2 , and the four output terminals of the overcurrent protection module 8 are respectively connected with the four input terminals of the solid state relay 9 . When the current in the three-phase distribution network is greater than the rated value of the working element, the slave controller 2 controls the overcurrent protection module 8 to complete the overcurrent protection.

specific Embodiment approach 3

[0013] Specific embodiment three: referring to Fig. 3, this embodiment increases the second rectifier 24 and the second inverter 25 on the basis of specific embodiment one, the input end of the second rectifier 24 and the second output end of the solid state relay 9 connected, the output end of the second rectifier 24 is connected to the input end of the second inverter 25, the output end of the second inverter 25 is connected to the second input end of the grid-connected module 13, and the control of the second inverter 25 The input end is connected with the second inverter control output end of the slave controller 2 . Through two sets of rectifiers and two sets of inverters, one phase can supply power to one phase, one phase can supply two phases, and two phases can supply power to one phase.

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Abstract

The invention provides an automatic balance device of a distribution network with three-phase load balance, which relates to a device able to automatically regulate the distribution network with three-phase load balance, aiming to solving problems that in the prior art, an adjustment method of the distribution network three-phases load balance is only able to cause the distribution network nearly to the three-phase balance with the disadvantages of waste of time and vigor, requirement of a shutdown and delay manufacture. In the invention, a voltage detection module, an electric current detection module, a voltage across-zero-aberration detection module and a solider relay and power-supply module are connected with the three-phase distribution network; the voltage detection module and the electric current detection module are connected with an electric energy computation module; the electric energy computation module is connected with an interface electric level switching module; the interface electric level switching module is connected with a master controller; the voltage across-zero-aberration detection module is connected with a slave controller; the control input terminal of the slave controller is connected with a control output terminal of the master controller; the solider relay is connected with a first rectifier; the solider relay is connected with the slave controller; the first rectifier is connected with a first inverter; the first inverter is connected with a parallel-in module, and the parallel-in module is connected with the three-phase distribution network.

Description

technical field [0001] The invention relates to a device for automatically adjusting three-phase load balance of a power distribution network. Background technique [0002] At present, one of the main problems existing in the urban and rural distribution network is the unbalanced three-phase load, which will have a great impact on the production and transmission of electric power. If the unbalanced gap is too large, it will even damage the power equipment. The unbalanced three-phase load is mainly caused by the fact that most users only choose one phase from the three phases when using electricity. The main solution at present is that the power operation department finds a large power-consuming unit to manually adjust according to the load conditions of each phase. The power consumption of one unit of them makes the three-phase load of the power grid in the area tend to be basically balanced as a whole, and the difference between the three-phase loads is within the allowable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26
CPCY02E40/50
Inventor 英晓东
Owner HEILONGJIANG ZHONGXING SCI & TECH
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