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Current-limiting energy storage circuit and control method thereof

An energy storage circuit, superconducting current limiting technology, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve current limiting inductor resonance, affect fault current limiting effects, etc.

Inactive Publication Date: 2010-10-27
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

At the same time, the functions of energy storage and fault current limiting are realized, but its main disadvantage is that the filter capacitor is always connected to the line during the fault current limiting process, and may resonate with the current limiting inductor, thus affecting the effect of fault current limiting

Method used

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Embodiment Construction

[0019] Figure 6 It is the topology structure of Embodiment 1 of the present invention. Such as Figure 6 As shown, the structure of Embodiment 1 of the present invention is as follows: the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5 and the sixth switch S6 form the first current source converter CSC1 . The cathode of the first switch S1 is connected to the anode of the fourth switch S4, and the connection point thereof is the first AC connection point PA1. The first switch S1 and the fourth switch S4 constitute the first half bridge HB1 of the first current source inverter CSC1. The cathode of the second switch S2 is connected to the anode of the fifth switch S5, and its connection point is the second AC connection point PA2. The second switch S2 and the fifth switch S5 constitute the second half-bridge HB2 of the first current source inverter CSC1. The cathode of the third switch S3 is connected to the anode of t...

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Abstract

The invention discloses a superconductive current-limiting energy storage circuit and a control method thereof. A superconducting magnet is connected in series with a power grid through a current source converter, a filter capacitor, a switch, a voltage dependent resistor, a transformer and the like. In a normal state, the voltage of the filter capacitor is changed and the voltage distortion of the power grid is compensated by controlling the current injected into the filter capacitor by the current source converter so as to improve the quality of the power supply voltage of a load. When a circuit is short-circuited, the filter capacitor is disconnected with the power grid through the switch and the voltage dependent resistor, and all the switches of the current source converter are turned on, so that the superconducting magnet is connected in series with the power grid in the form of uncontrolled rectifier so as to limit the fault current.

Description

technical field [0001] The invention relates to a current-limiting energy storage circuit and a control method thereof. 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 reason...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02H9/04H02J3/28
CPCY02E40/69Y02E40/67Y02E40/60
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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