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Power electronic failure current limiter

A fault current limiter, power electronics technology, applied in the protection, electrical components, circuit devices and other directions that react to overcurrent, can solve problems such as threats to the safe operation of the current limiter, sudden changes in grid current, etc.

Inactive Publication Date: 2011-11-23
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the switch is turned off, the structure will cause a sudden change in the grid current, which will induce an overvoltage on the grid impedance, and the overvoltage will act on the rectifier bridge, which will threaten the safe operation of the current limiter itself.

Method used

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Examples

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0013] Figure 4 and Figure 5 It is the internal and external circuit structure of Embodiment 1 of the present invention. like Figure 4 As shown, in a current limiting unit, the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 form a diode rectifier Rf1; the first diode D1 and the second diode The cathodes of the two diodes D2 are connected together to form the first DC connection point PD1, the anodes of the third diode D3 and the fourth diode D4 are connected together to form the second DC connection point PD2, and the current limiting inductor Both ends of Ls are connected to the first DC connection point PD1 and the second DC connection point PD2, the cathode of the third diode D3 is connected to the anode of the first diode D1 to form the first AC connection point PA1, The cathode of the fourth diode D4...

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Abstract

The invention discloses a power electronic failure current limiter, which adopts unitized structural design. Each unit consists of a current-limiting resistor and a current-limiting inductive branch, wherein the current-limiting inductive branch provides transient current-limiting impedance and limits the rising rate of a failure current; when the amplitude of a line current of a power grid descends to zero, a switch which is formed by thyristors naturally disconnects the current-limiting inductive branch; and the current-limiting resistor limits the failure current and is used for equalizing voltages of the units, so the units can be connected in series, and requirements on higher voltage class are met.

Description

technical field [0001] The invention relates to a power electronic fault current limiter. Background technique [0002] With the rapid development of the national economy, the society's demand for electricity continues to increase, which drives the continuous development of the power system. The capacity of single machines and power plants, the capacity of substations, and the load of cities and centers continue to increase, which makes the power systems interconnected. As the level of short-circuit current in the power grid continues to increase, short-circuit faults are becoming more and more destructive to the power system and its connected electrical equipment. Moreover, while the demand for electric energy is increasing day by day, people also put forward higher requirements for power quality, power supply reliability and security. However, the transient stability of large power grids is more prominent, and one of the most important reasons is that conventional power t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02H9/04H02H3/08
Inventor 郭文勇肖立业戴少涛张志丰
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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