A resistive-inductive DC current limiting device and method based on magnetic coupling enhancement characteristics
A technology of current limiting device and magnetic coupling, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. problem, to achieve the effect of fast current limiting response, good current limiting effect and small impact
Active Publication Date: 2021-10-26
TIANJIN UNIV
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Problems solved by technology
[0003] In order to solve the problem that the fault current rises too fast after the DC line fault occurs and the short-circuit current is difficult to limit, the present invention proposes a resistance-inductive DC current limiting device and method based on magnetic coupling enhancement characteristics to realize common current limiting of inductors and resistors Resistance-sensing DC current limiting function
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[0016] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. The embodiment is only an example, and is not intended to limit the technical solution of the present invention.
[0017] Such as figure 1 As shown, it is a schematic diagram of a resistive-inductive DC current limiting method based on magnetic coupling enhancement characteristics of the present invention. The current limiting method consists of a double-pole double-throw switching device S, a pair of fully coupled inductance coils with equal self-inductance wound on the same iron core L 1 , L 2 accomplish. During normal operation, the double pole double throw switching device S Closed at terminal b and terminal d, the line current flows in from the opposite ends of the two coupled inductor coils respectively, the magnetic flux cancels each other, and the equivalent inductance of the current limiter is almost 0; after a s...
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The invention discloses a resistive-inductive DC current limiting device and method based on magnetic coupling enhancement characteristics. Fully coupled inductor L 1 , L 2 The double-pole double-throw switch S is closed at the b end and the d end, which is the normal operation state of the inductance current limiting; the switch S is switched to the a end and the c end, which is the state of the inductance current limiting short-circuit fault; the resistive element is set On the inductance coil side of the a-end of the switch S, it is used to realize common DC current limiting of resistance and inductance. Compared with the prior art, the present invention has the characteristics of good current limiting effect, simultaneous input of inductance and resistance for current limiting, and quick recovery after failure.
Description
technical field [0001] The invention relates to the field of power system protection, in particular to a resistive-inductive direct current limiting method. Background technique [0002] The DC fault protection of the flexible DC system is a key technology in the development of the DC system. In order to ensure the safe and reliable operation of the DC system, the DC circuit breaker of the flexible DC system needs to act quickly within a few milliseconds of the DC fault, and reliably cut off the fault line. It is difficult for the circuit breaker to quickly remove the line fault, so a fault current limiter needs to be connected in series to limit the rising speed and amplitude of the fault current, leaving enough margin for the DC circuit breaker to cut off the fault line. Although the DC fault current limiter technology is constantly developing, the existing DC current limiters still have shortcomings such as high cost, slow response speed, and poor current limiting effect...
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IPC IPC(8): H02H9/02H02H7/26
CPCH02H7/268H02H9/02
Inventor 李斌杨嵩
Owner TIANJIN UNIV