Series-connected capacitor compensation device and method used for power distribution network

A series capacitor compensation, distribution network technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation and other directions, can solve the problems of lower voltage at the end of the distribution network, voltage flicker, etc., to improve voltage quality , Improve the terminal voltage value, the effect of reasonable capacitance compensation

Inactive Publication Date: 2014-04-23
PINGDINGSHAN POWER SUPPLY ELECTRIC POWER OF HENAN +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a series capacitance compensation device and method for distribution network to solve the problems of distribution network terminal voltage lower than the standard and voltage flicker

Method used

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  • Series-connected capacitor compensation device and method used for power distribution network
  • Series-connected capacitor compensation device and method used for power distribution network
  • Series-connected capacitor compensation device and method used for power distribution network

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0032] Due to the resistance and inductance of the transmission line, when the current flows in the circuit, there is a voltage drop at the beginning and end of the line. Using a simplified line model, the load of the line is at the end of the line, R is the resistance of the transmission line, X C is the inductive reactance value of the transmission line, and the line voltage drop at this time:

[0033] ΔU = PR + Q X L U + j PX L - QR U - - - ( 1 ...

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Abstract

The invention discloses a series-connected capacitor compensation device and a method used for a power distribution network. The device comprises a current mutual inductor, a capacitor, a voltage mutual inductor, a damping loop, a damping electric reactor, a spark gap, a bypass switch and a controller. The capacitor is connected in series in a power transmission line. The damping loop is formed by the parallel-connected damping resistor and the damping electric reactor. The spark gap is connected in parallel with the bypass switch. The spark gap, the damping loop and the capacitor are connected in series. The current mutual inductor is bridge-connected in the power transmission line to measure current of the power transmission line. The voltage mutual inductor measures voltage of the power transmission line and supplies power to the controller and the bypass switch. The current mutual inductor and the voltage mutual inductor respectively transmit a current signal and a voltage signal, which are measured by the current mutual inductor and the voltage mutual inductor, to the controller. The tail end voltage value of the line can be enhanced, line voltage quality can be improved, voltage flicker harm can be reduced and power transmission capability of the line can be enhanced.

Description

technical field [0001] The invention belongs to the field of reactive power compensation in electric power systems, and relates to a series capacitor compensation device and method for distribution networks. Background technique [0002] In my country, the transmission lines of the distribution network are complex, the grid structure is weak, the grid structure is unreasonable, the power supply radius is large, and the load conditions are complex and changeable. It often occurs that the voltage at the end of the line cannot meet the power quality. There are a large number of distribution transformers, some distribution lines have multiple large-capacity motors or rapidly changing industrial loads and other impact loads, and the facilities of distribution transformers and motors in most areas are not advanced enough. These factors will increase the reactive power demand of the distribution network. , The start and stop of large-capacity motors will cause serious problems such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCY02E40/30
Inventor 张力淼牛宇干汪峰王俊良王永华宋佰鹏张冠军
Owner PINGDINGSHAN POWER SUPPLY ELECTRIC POWER OF HENAN
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