High-voltage reactive power automatic compensation device

A technology of automatic power compensation and high voltage, which is applied in the field of high-voltage reactive power automatic compensation device, can solve problems such as insufficient stability, complicated connection of device lines, and low power quality of the power grid, so as to achieve small voltage fluctuations, improve safety and stability, The effect of low power consumption

Active Publication Date: 2013-01-30
ZHEJIANG ZIGUANG ELECTRIC APPLIANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the device realizes the dynamic compensation of the reactive power compensation device and improves the compensation effect of the reactive power compensation device, the line connection of the device is complicated, and when it is used in a 35KV substation, there are problems such as low power quality and insufficient stability of the grid

Method used

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  • High-voltage reactive power automatic compensation device

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 As shown, the high-voltage reactive automatic compensation device includes a vacuum circuit breaker 2 and a switching capacitor group 5 for changing the power factor. The incoming side of the vacuum circuit breaker 2 is connected to the three-phase bus 1, and the outgoing side of the vacuum circuit breaker 2 is sequential A reactor 3 and an intelligent switching switch 4 are connected in series, and the intelligent switching switch 4 is connected to the switching capacitor group 5. The device also includes a controller 8, a current sensor 9 for detecting the current of each phase of the three-phase bus 1 and a The voltage sensor 10 for detecting the voltage of each phase of the three-phase bus 1, the current sensor 9 and the voltage sensor 10 are all connected to the input terminal of the controller 8, and the output terminal of the controller 8 is connected to the intelligent switching switch 4; the vacuum circuit breaker 2 and the three-phase A fuse 6...

Embodiment 2

[0035] Such as figure 2 As shown, the content of the second embodiment is basically the same as that of the first embodiment, the difference is that in the high-voltage reactive power automatic compensation device, the switching capacitor group 5 includes three switching capacitors connected in a star shape, and the three switching capacitors A lightning protection circuit 7 is connected to the connection point of the switching capacitor, and a fuse 6 is connected in series between the other ends of the three switching capacitors and the intelligent switching switch 4 . The switching capacitor group 5 is connected with one end of three switching capacitors to form a star structure, and the connection point of the star structure is connected to the lightning protection circuit 7, which can effectively prevent the occurrence of lightning tripping accidents on the transmission line. Reliable protection is provided; the other ends of the three switching capacitors are respectivel...

Embodiment 3

[0037] Such as image 3 As shown, the content of the third embodiment is basically the same as that of the first embodiment, the difference is that in the high-voltage reactive power automatic compensation device, the switching capacitor group 5 includes three switching capacitors connected in a triangle, and the switching capacitors A capacitor and a fuse 6 are respectively connected in series between the connection point and the intelligent switching switch 4 . The connection points of two switching capacitors are respectively connected to the intelligent switching switch 4 through capacitors and fuses 6. Once the line has a short-circuit fault, the fuse 6 will jump off immediately, which can effectively prevent damage to the switching capacitor group 5 and the line; And in this embodiment, the reactor 3 and the switching capacitor connected in the line form an LC tuning circuit for a specific harmonic, so that the filter branch has a very low impedance to a certain harmonic...

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Abstract

The invention provides a high-voltage reactive power automatic compensation device, belongs to the technical field of reactive power compensation of a power grid, and solves the problems of low power quality and poor stability of the power grid when the conventional device is used in a 35KV transformer substation. The high-voltage reactive power automatic compensation device comprises a vacuum circuit breaker, a switching capacitor group, a controller, a current sensor and a voltage sensor, wherein the switching capacitor group is used for changing a power factor; the wire inlet side of the vacuum circuit breaker is connected with a three-phase generatrix; the wire outlet side of the vacuum circuit breaker is connected in series with a reactor and an intelligent switching switch in sequence; the intelligent switching switch is connected with the switching capacitor group; the current sensor is used for detecting the current of each phase of the three-phase generatrix and the voltage sensor is used for detecting the voltage of each phase of the three-phase generatrix; the current sensor and the voltage sensor are both connected with the input end of the controller; and the output end of the controller is connected with the intelligent switching switch. The device does not generate a harmonic wave in use, and is low in loss and high in grid power quality and stability.

Description

technical field [0001] The invention belongs to the technical field of grid reactive power compensation and relates to a high-voltage reactive power automatic compensation device. Background technique [0002] The high-voltage reactive power automatic compensation device - SVG, is mainly aimed at the transmission and distribution grid, adjusting the grid voltage, and improving the power quality; the load compensation is mainly aimed at compensating the reactive power of the power user terminal, and improving the user's power factor. [0003] However, there are generally insufficient reactive power compensation and unreasonable layout in my country's distribution network at present, and there is a phenomenon of capacitor capacity inversion in urban and rural power grids and regional power grids. At present, domestic capacitor banks are all connected in ungrounded star connection. For large-capacity compensation, multiple capacitors need to be connected in series and parallel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCY02E40/30
Inventor 周鹤铭刘志远颜安军
Owner ZHEJIANG ZIGUANG ELECTRIC APPLIANCE
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