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Low-voltage dynamic reactive power compensation device

A compensation device and dynamic technology, applied in the direction of reactive power compensation, reactive power adjustment/elimination/compensation, circuit devices, etc., can solve the problem of large differences in controllers, uneven technologies of manufacturers, and limited low-voltage dynamic reactive power compensation devices. Large-scale application and other issues, to meet the requirements of use and achieve good results

Inactive Publication Date: 2015-04-29
ANHUI KAICHUAN POWER PROTECTION EQUIP
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Problems solved by technology

However, the controllers of the key units in the existing low-voltage dynamic reactive power compensation device are quite different, and the technology of each manufacturer is uneven, which limits the large-area application of the low-voltage dynamic reactive power compensation device and cannot meet the requirements of distribution network automation. need

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  • Low-voltage dynamic reactive power compensation device

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Embodiment Construction

[0011] The content of the present invention will be described below in conjunction with specific embodiments.

[0012] Such as figure 1 As shown, it is the principle diagram of the reactive power compensation of the shunt capacitor in the present invention, wherein figure 1 a) as its compensation circuit, figure 1 b) is the undercompensated phasor diagram, figure 1 c) is the overcompensated phasor diagram.

[0013] Whether the loads in the distribution network are industrial loads or residential loads, most of them are inductive loads. When they operate, they need to absorb a large amount of reactive power from the grid, resulting in a decrease in the power factor and power quality of the grid, and an increase in the "technical power loss" of the grid. After the shunt capacitor compensation device is installed in the power grid, it can reduce the reactive power transmitted from the power source to the inductive load via the transmission line. Since the flow of reactive po...

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Abstract

The invention relates to a low-voltage dynamic reactive power compensation device. The reactive power compensation device comprises a controller, air switches, fuses, a composite switch and capacitors; each phase lead of a low-voltage distribution network is firstly connected with the corresponding air switch, then is connected in series with the corresponding fuse and the composite switch, and is connected in parallel with the corresponding capacitor; the capacitors are connected in parallel with one another in a Y-shaped connecting mode or a triangle-shaped connecting mode; each phase lead of a current transformer of the low-voltage distribution network is connected with the controller; leads of the controller are electrically connected with the leads of the air switches; the leads of the controller are connected with the composite switch. According to the low-voltage dynamic reactive power compensation device, the capacitors are connected in parallel with one another in a Y-shaped connecting mode or a triangle-shaped connecting mode, so that remote communication or close range wireless communication can be realized, a soft and hardware foundation is laid to realize automatic network distribution, remote communication, unattended operation and the like required by rebuild of an urban power grid, automatic request for utilization of the distribution network is realized, and the implementation effect is good.

Description

technical field [0001] The invention relates to a low-voltage dynamic reactive power compensation device, which belongs to the technical field of electrical protection. Background technique [0002] In recent years, with the implementation and deepening of urban and rural power grid transformation, installing low-voltage dynamic reactive power compensation devices on 0.4kV power grids can improve power supply quality, tap the potential of power supply equipment, and reduce line losses. It has become more and more consensus. The low-voltage dynamic reactive power compensation device is generally composed of a microcontroller, a switch for switching capacitors, a capacitor bank, an air switch, a fuse, and a stainless steel shell. It has simple structure, convenient and flexible switching, and remarkable energy-saving effect, so it has been widely used and promoted. However, the controllers of the key units in the existing low-voltage dynamic reactive power compensation device...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCY02E40/30H02J3/1821H02H9/047
Inventor 王森张进军吴玉保苏玉峰
Owner ANHUI KAICHUAN POWER PROTECTION EQUIP
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