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Controllable zero sequence compensator of low-voltage power grid

A low-voltage power grid and zero-sequence compensation technology, applied in the electric power field, can solve problems such as three-phase imbalance, and achieve the effect of solving three-phase imbalance

Inactive Publication Date: 2015-04-29
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the application provides a controllable zero-sequence compensator for the low-voltage power grid, which is used to compensate the zero-sequence current to solve the three-phase unbalance problem of the low-voltage power grid

Method used

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  • Controllable zero sequence compensator of low-voltage power grid
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Embodiment Construction

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0026] figure 1 A structural diagram of a controllable zero-sequence compensator for a low-voltage power grid provided in this application.

[0027] Such as figure 1 As shown, the controllable zero-sequence compensator provided in this embodiment includes a meander transformer 10 and a single-phase inverter 20 .

[0028] The 10 three-phase input terminals of the meander transformer are connected to the three-phase phases of the low-voltage power grid 100. Since its impedance to the positi...

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Abstract

The invention provides a controllable zero sequence compensator of a low-voltage power grid. The controllable zero sequence compensator comprises a zigzag transformer and a single-phase inverter, wherein the zigzag transformer is connected with the low-voltage power grid, one end of the output end of the single-phase inverter is connected with the neutral line of the zigzag transformer, the other end of the output end of the single-phase inverter is used for being connected with the neutral line of the low-voltage power grid, and the single-phase inverter is used for outputting compensation currents to the neutral line of the low-voltage power grid according to the currents of the neutral line of the zigzag transformer, the currents of the neutral line of the low-voltage power grid and the currents of the neutral line of a load. By the controllable zero sequence compensator, zero sequence currents form a loop among the zigzag transformer, the single-phase inverter and the load, the currents of the neutral line of the low-voltage power grid is allowed to drop to zero, compensation of the zero sequence currents of the low-voltage power grid is completed, and the three-phase unbalance problem of the low-voltage power grid is solved.

Description

technical field [0001] The present application relates to the field of electric power technology, and more specifically, relates to a controllable zero-sequence compensator for a low-voltage power grid. Background technique [0002] my country's distribution network adopts a three-phase four-wire distribution transformer power supply mode, and the transformer capacity is less than 100kVA, which accounts for about half of the total number of transformers in the world. Because the distribution is basically done manually, it is easy to cause low-voltage single-phase loads in the distribution network to fail. These factors inevitably lead to the unbalanced three-phase problem of the low-voltage power grid. [0003] Unbalanced three-phase will lead to neutral line overload, overheating, and electromagnetic interference, affect the supply voltage waveform, insulation layer damage, reduce power factor, reduce the service life of transformers and electrical equipment and other proble...

Claims

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Application Information

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IPC IPC(8): H02J3/26
CPCY02E40/50H02J3/26
Inventor 董细炉徐永阳章忠郑健睿张育华方淼江李琼
Owner STATE GRID CORP OF CHINA
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