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Apparatus and method for automatically improving terminal voltages of low-voltage three-phase line

A terminal voltage and low voltage technology, applied in the field of electric power supply, can solve the problems of small transfer power, poor three-phase unbalanced effect, unbalanced line branch current, etc., and achieve the effect of reducing line loss and low three-phase current unbalanced degree

Active Publication Date: 2016-11-30
北京燕能电气技术有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing scheme is mainly to adjust the terminal voltage through reactive power compensation, the transfer power is small, and the effect of achieving three-phase imbalance is relatively poor, and the compensation device is installed at the outlet of the transformer, which cannot solve the problem of unbalanced line branch current

Method used

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  • Apparatus and method for automatically improving terminal voltages of low-voltage three-phase line

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Embodiment Construction

[0025] Such as figure 1 As shown, the present invention sets a main control unit 2 at the output end of the transformer 1, and installs a commutation voltage regulation device 3 at the user input end, and the phase commutation voltage regulation device 3 includes a commutation switch 4, a power transfer compensation unit 5 and a reactive power Compensation unit 6; the commutation switch, power transfer compensation unit and reactive power compensation unit are all equipped with a voltage and current information acquisition module and a wireless communication module, and communicate with the main control unit through the wireless communication module.

[0026] The main control unit mainly includes a control circuit board, which presets parameters such as the normal voltage range value and the normal range value of the current unbalance degree, and judges whether the line voltage and current are within the normal value range, and communicates to the commutation switch, power The...

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Abstract

The invention provides an apparatus and method for automatically improving terminal voltages of a low-voltage three-phase line. When first terminal voltages are not within a normal scope, a reactive compensation unit carries out compensation and acquires second terminal voltages and currents after the compensation, and if the second terminal voltages are still not within the normal scope and are greater than a voltage upper threshold and when the current imbalance degree is not within a normal scope, an implementation commutation switch implements commutation; when the second terminal voltages are smaller than a voltage lower threshold yet the current imbalance degree is within the normal scope, power transfer compensation is carried out; if the current imbalance degree is not within the normal scope, after the power transfer compensation is performed, third terminal voltages and currents are acquired; if the imbalance degree of the third terminal voltages is within the normal scope, commutation voltage regulation is stopped; and otherwise, the commutation switch implements the commutation.

Description

technical field [0001] The invention relates to the technical field of electric power supply, in particular to a method for automatically increasing the voltage at the end of a low-voltage three-phase line, and in particular to automatic input when the voltage at the end of the low-voltage line is low. Background technique [0002] At present, the total capacity of transformers in operation in my country is about 3.5×10 9 kVA, due to the large number of units and large capacity, the power loss is very large. According to statistics, the power loss of distribution transformers (referred to as distribution transformers) alone is about 30-50 TWh per year, accounting for about 2-3% of the total power generation. At present, the capacity of low-efficiency distribution transformers operating on the power grid for more than 20 years is about 2.4×10 8 kVA, at the same time, these distribution transformers have aging parameters, high loss, many defects, and poor operation reliabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/12H02J3/16H02J3/26
CPCH02J3/12H02J3/16H02J3/26Y02E40/30Y02E40/50
Inventor 赵世红
Owner 北京燕能电气技术有限公司
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