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Hybrid direct-current fault current limiter and control method thereof

A technology of DC fault and current limiter, which is applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc. used to limit overcurrent/overvoltage, and can solve the problem that the protection and circuit breaker action speed cannot meet the reliable fault ride-through of the power grid, etc. problem, achieve the effect of avoiding rapid spread, good economic performance, and shortening the clearing time

Active Publication Date: 2021-06-08
TIANJIN UNIV
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Problems solved by technology

[0004] Aiming at the fact that the protection and action speed of circuit breakers in the current HVDC transmission system cannot meet the requirements of reliable fault ride-through of the power grid, this invention proposes a hybrid DC fault current limiter and its control method to effectively limit the fault current after a fault Rise rate and amplitude to achieve reliable fault ride-through for HVDC flexible DC grid

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  • Hybrid direct-current fault current limiter and control method thereof
  • Hybrid direct-current fault current limiter and control method thereof
  • Hybrid direct-current fault current limiter and control method thereof

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Embodiment Construction

[0023] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] Such as figure 1 Shown is a topological structure diagram of a hybrid DC fault current limiter of the present invention. In this topology, the current branch is composed of an ultrafast disconnector (UFD) and a load current transfer switch (load commutation switch, LCS). Wherein, the load current transfer switch is composed of two groups of IGBTs with anti-parallel diodes connected in reverse series. The current-limiting branch consists of a pair of coupled current-limiting inductors L with equal inductance values 1 with L 2 , Two groups of diode groups D 1 with D 2 , a pair of equal value resistors R 1 with R 2 And two groups of anti-series IGBTs with anti-parallel diodes and a lightning arrester A form an H-bridge structure including bridge arm one to bridge arm four. One of the bridge arms is routed by the ...

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Abstract

The invention discloses a hybrid direct-current fault current limiter and a control method thereof. A through-current branch is composed of an ultra-fast switch UFD and a load current change-over switch LCS. During normal operation, the load current only passes through the ultra-fast switch and the load current change-over switch; after a direct-current fault occurs, a lightning arrester can be quickly connected into a fault loop, so that the rising speed of fault current and the peak value of the fault current are effectively limited; after the direct-current circuit breaker trips, the lightning arrester automatically quits operation, and the energy stored in the inductor is finally absorbed by the resistor in the loop; in a non-fault line, the lightning arrester in the current limiter limits the current, so that the current is automatically transferred to the branch of the resistor R2 after the current is reduced to be lower than the action current. Compared with the prior art, the rising speed and amplitude of the fault current are effectively limited after the fault, and then reliable fault ride-through suitable for the high-voltage flexible direct-current power transmission network is achieved.

Description

technical field [0001] The invention relates to the field of high-voltage flexible DC transmission network, in particular to a DC fault current limiter and a parameter design method thereof. Background technique [0002] In order to improve the reliability of power transmission and reduce the cost of power transmission, it has become a trend to use DC bus for power transmission in flexible DC systems. Therefore, based on voltage source converters (VSC), especially based on modular multi- The flexible direct current transmission system of the modular multi-level converter (MMC) has become an important research direction at present. However, when a fault occurs in the flexible DC system, the sub-module capacitance in the converter will quickly discharge to the fault point, which will cause the current in the fault line and the bridge arm of the converter to rise rapidly. Considering that the converter contains a large number of power electronic devices with very limited curre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H9/02
CPCH02H7/268H02H9/02Y02E60/60
Inventor 李斌贾涵茹何佳伟
Owner TIANJIN UNIV
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