KR20110110894A - DC Reactor & Resistance Mixed 3 Phase Superconducting Accident Current Limiter - Google Patents
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- H—ELECTRICITY
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Abstract
본 발명은 3상 계통의 단락사고로 인한 사고전류 제한을 위해, 3상 브리지 정류회로와 고온 초전도 코일을 이용하여 코일의 인덕턴스와 상도체화 되는 초전도체의 저항을 통해 사고전류 제한기에 관한 것이다.
본 발명에 따른 초전도 사고전류 제한기는 순간적으로 사고전류를 제한하기 위해 3상 브리지 정류회로 내에 유도형 초전도 직류리액터(Inductive superconducting coil)와 무유도형 초전도 코일(Non-inductive coil)로 구성 되어져 차단기와 직렬로 설치되어 송전선로의 일부로 사용될 수 있는 것을 특징으로 한다.
이와 같이 구성되는 본 발명에 따르면 사고발생 시에 있어서 초전도 코일의 인덕턴스와 초전도 코일의 순간적인 상도체화 현상에 의해 빠르게 사고전류를 적정치 이하로 제한하여 전력계통의 안정과 각종 기기 파손의 방지를 도모할 수 있고, 사고가 발생되지 않는 정상상태에서 임피던스를 갖지 않음으로써 기존의 전력계통 망에 다른 영향을 주지 않으면서 송전선로의 일부로 사용될 수 있다.
본 발명의 사고전류 제한효과를 높이기 위해, 유도형 코일의 자장발생을 이용하여 무유도형 초전도 코일의 빠른 상도체화를 발생하도록 하는 코일 설계방법의 이용이 필요하다.The present invention relates to an accident current limiter through the resistance of the superconductor phased into the inductance of the coil by using a three-phase bridge rectifier circuit and a high temperature superconducting coil for limiting the fault current due to a short circuit accident of the three-phase system.
The superconducting fault current limiter according to the present invention is composed of an inductive superconducting coil and a non-inductive superconducting coil in a three-phase bridge rectifier circuit in order to limit the fault current in an instant. It can be installed to be used as part of a transmission line.
According to the present invention configured as described above, the accident current is rapidly limited to an appropriate value or less by the inductance of the superconducting coil and the instantaneous phase conduction phenomenon of the superconducting coil at the time of an accident, thereby to stabilize the power system and prevent damage to various devices. It can be used as part of the transmission line without affecting the existing power system network by having no impedance in the normal state where no accident occurs.
In order to increase the fault current limiting effect of the present invention, it is necessary to use a coil design method to generate a fast phase conduction of the non-inductive superconducting coil using the magnetic field generation of the induction coil.
Description
전력기기분야Power device field
고온 초전도 코일을 이용한 사고전류 제한 기술Accident current limiting technology using high temperature superconducting coil
본 발명을 통해 3상 계통의 단락사고로 인해 계통에서 큰 사고전류가 흐를 경우, 전력계통을 보호하는 사고전류 제한기가 필요하며, 3상 브리지 정류회로와 고온 초전도 코일을 이용하여 코일의 인덕턴스와 상도체화 저항을 통해 사고전류를 제한할 수 있다.In the present invention, when a large fault current flows in the system due to a short circuit accident of the three-phase system, an accident current limiter is required to protect the power system, and a three-phase bridge rectifier circuit and a high temperature superconducting coil are used to inductance and phase conductivity of the coil. The immunization resistance can limit the fault current.
3상 계통과 연결된 브리지 정류회로에 고온 초전도 선재를 이용한 직류리액터를 설치한다. 계통 사고가 발생하지 않는 정상상태에서는 초전도 한류기는 기본적으로 일반적인 브리지회로와 동일하게 동작한다. 3상 전원이 120˚의 위상차를 가지고 전력계통에 인가될 경우, 브리지회로로 들어오는 3상 교류전류들이 전력변환기를 통과하면서 전파 정류된다. 정류된 직류전류는 직류리액터로 흐르게 되고 직류전류는 작은 리플을 가지게 되는데, 직류리액터의 인덕턴스가 충분히 클 경우, 이 리플은 무시할 수 있을 정도로 작아지기 때문에 거의 일정한 직류전류가 리액터를 흐르게 되고 브리지회로 내의 임피던스는 거의 ‘0’이 된다. A DC reactor using high temperature superconducting wire is installed in the bridge rectifier circuit connected to the 3-phase system. Under normal conditions without system faults, the superconducting fault current limiter basically operates like a normal bridge circuit. When three-phase power is applied to the power system with a phase difference of 120 °, three-phase AC currents entering the bridge circuit pass through the power converter and are rectified. The rectified DC current flows to the DC reactor, and the DC current has a small ripple. When the inductance of the DC reactor is large enough, the ripple becomes small enough to be negligible, so that almost constant DC current flows through the reactor, The impedance is almost '0'.
정상상태에서는 브리지회로 내에 임피던스가 존재하지 않기 때문에 브리지회로 내에서의 전력 손실은 선재에 의한 손실과 전력소자에 의한 손실만을 고려할 수 있다. 선재의 경우 초전도상태이고 직류가 흐르므로 선재 자체의 저항으로 인한 줄열 및 교류손실은 존재하지 않는다. 전력소자에 의한 손실도 매우 적다고 할 수 있으므로, 정상상태에서 한류기에 의한 손실은 거의 없다고 할 수 있다. In the steady state, since there is no impedance in the bridge circuit, the power loss in the bridge circuit can only consider the loss caused by the wire rod and the power element. In the case of wire rod, since superconducting state and direct current flow, there is no Joule heat and AC loss due to resistance of wire rod itself. It can be said that the loss by the power device is very small, so that there is almost no loss by the current limiter in the steady state.
전력계통에 단락사고가 발생한 경우에는, 브리지회로의 각 전력소자에 걸리던 전압이 정상상태에 비해 수십 배 증가하고, 초전도 코일을 통과하던 전류 또한 급격히 증가하게 된다. 즉, 직류리액터를 통과하여 흐르는 사고전류가 시간에 따라 변화하게 되므로 di/dt가 발생하게 되고 리액터에는 인덕턴스 성분의 임피던스가 발생하게 된다. 따라서, 리액터의 인덕턴스로 인해 사고전류는 급격히 증가하지 못하고 완만한 증가율을 가지게 된다. 또한, 초전도 코일의 경우 임계전류 이상이 코일에 흐르게 되면 코일은 초전도 상태에서 상도체화 상태로 전이되어 저항을 발생하게 되는데, 이러한 상도체화 저항을 통해 사고전류 제한을 병행한다.
In the event of a short circuit in the power system, the voltage applied to each power device of the bridge circuit increases by several tens of times compared to the normal state, and the current passing through the superconducting coil also increases rapidly. That is, since the fault current flowing through the DC reactor changes with time, di / dt is generated and an impedance of an inductance component is generated in the reactor. Therefore, due to the inductance of the reactor, the fault current does not increase rapidly but has a slow rate of increase. In addition, in the case of a superconducting coil, when a threshold current or more flows in the coil, the coil is converted into a superconducting state from the superconducting state to generate a resistance, and the fault current limiting is performed in parallel through such a superconducting resistor.
상기한 구성의 본 발명에 따르면, 사고발생 시에 있어서 고온 초전도 코일의의 인덕턴스와 순간적인(1ms) 상도체화 현상에 의해 종래의 차단기 시스템에 비해 80배 이상 빠르게 사고전류를 적정치 이하로 제한하여 전력계통의 안정과 각종 기기의 파손 방지를 도모할 수 있고, 브리지 정류회로를 통해 직류로 전환된 계통전류가 고온 초전도 코일에 흐르게 되어 임피던스를 발생시키지 않으므로, 기존의 전력계통 망에 다른 영향을 주지 않으면서 송전선로에 적용될 수 있다.According to the present invention of the above configuration, by the inductance of the high-temperature superconducting coil and the instantaneous (1ms) phase conduction phenomenon at the time of the accident by limiting the fault current to an appropriate value or less than 80 times faster than the conventional circuit breaker system It is possible to stabilize the power system and prevent damage to various devices, and since the system current converted to direct current through the bridge rectifier circuit flows in the high temperature superconducting coil, it does not generate an impedance, and thus does not affect other existing power system networks. It can be applied to power transmission lines without.
또한, 사고전류를 순간적으로 적정치 이하로 억제하여 과전류가 주변 전력 기기를 통해 흐르는 것을 방지함으로써 기존에 비해 적은 용량의 각종 전력 기기를 설치할 수 있고 계통시스템의 효율적 운용을 도모할 수 있다.In addition, it is possible to install various power devices with a smaller capacity than the conventional one and to promote efficient operation of the system by preventing accidental currents to be below an appropriate value and preventing overcurrent from flowing through the surrounding power devices.
도 1 은 본 발명에 따른 직류리액터 및 저항 혼합형 초전도 사고전류 제한기가 3상 계통에 연결되어 있는 도면.
도 2 는 본 발명에 따른 유도형 초전도 직류리액터(Inductive superconducting coil)의 자장발생을 이용하여 무유도형 초전도 코일(Non-inductive coil)의 빠른 상도체화를 발생하도록 하는 코일 설계도면.1 is a diagram in which a DC reactor and a resistance mixed type superconducting fault current limiter according to the present invention are connected to a three-phase system.
FIG. 2 is a coil design diagram for generating rapid phase conduction of a non-inductive coil using magnetic field generation of an inductive superconducting coil according to the present invention. FIG.
기존의 저항형 초전도 한류기의 경우 사고발생에 따라 임계전류 이상의 급격한 사고전류가 증가하여 첫 번째 사이클에서 초전도 코일이 상도체화가 발생하고 상도체화가 확대됨에 따라 점차적으로 사고전류 제한효과가 커지는 특성을 가진다. 이와 달리, 직류리액터형 초전도 한류기는 사고발생 이후부터 바로 큰 사고전류 제한효과를 가지다가 점차적으로 사고전류를 증가시키면서 사고전류 제한효과가 완화되는 특성이 있다. 그러나, 본 발명의 직류리액터 및 저항 혼합형 초전도 한류기는 저항형과 직류리액터형 한류기가 가진 사고전류 제한에 대한 단점을 보완할 수 있다. 또한, 직류리액터ㆍ저항 혼합형 초전도 한류기는 사고전류가 저항형 초전도 한류기보다 상당히 완만한 추세로 증가하게 되어 초전도 코일의 상도체화에 있어서도 상대적으로 안정적인 상도체화특성을 가질 수 있다. In the case of the conventional resistance type superconducting fault current limiter, the accident current increases more than the threshold current according to the occurrence of the accident, and the superconducting coil becomes phase conductor in the first cycle and the fault current limiting effect gradually increases as the phase conductor is expanded. Have On the other hand, the DC reactor type superconducting fault current limiter has a large fault current limiting effect immediately after an accident, and gradually increases the fault current while reducing the fault current limiting effect. However, the DC reactor and the resistive mixed superconducting fault current limiter of the present invention can compensate for the disadvantages of the fault current limitation of the resistive and DC reactor type fault current limiters. In addition, the DC reactor / resistive hybrid superconducting fault current limiter has a more gentle trend than the resistive superconducting fault current limiter, so that the superconducting characteristics of the superconducting coil can be relatively stable.
직류리액터ㆍ저항 혼합형 초전도 한류기의 사고전류 제한효과를 높이기 위해서는 사고 후의 빠른 상도체화발생이 필요한데, 본 발명에서는 도면 2와 같이 유도형 코일의 외부자장을 이용하여 빠른 상도체화를 발생하도록 하는 코일 설계방법을 적용하였다.In order to increase the fault current limiting effect of the DC reactor / resistive hybrid superconducting fault current limiter, a rapid phase conduction is required after the accident. In the present invention, as shown in FIG. 2, a coil design is used to generate rapid phase conduction using an external magnetic field of an inductive coil. The method was applied.
없음none
Claims (1)
사고전류 제한효과를 높이기 위해, 유도형 코일의 자장발생을 이용하여 무유도형 초전도 코일의 빠른 상도체화를 발생하도록 하는 코일 설계방법.In the fault current limiter for limiting the fault current of the power system, a DC reactor and a resistance mixed superconducting fault current limiter using an inductive superconducting coil and a non-inductive superconducting coil.
Coil design method to generate rapid phase conduction of the non-inductive superconducting coil by using the magnetic field generation of the induction coil in order to increase the fault current limiting effect.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879623A (en) * | 2018-06-13 | 2018-11-23 | 南京南瑞继保电气有限公司 | A kind of multi-voltage grade DC grid system and control guard method |
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2010
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879623A (en) * | 2018-06-13 | 2018-11-23 | 南京南瑞继保电气有限公司 | A kind of multi-voltage grade DC grid system and control guard method |
| CN108879623B (en) * | 2018-06-13 | 2020-06-05 | 南京南瑞继保电气有限公司 | Multi-voltage-level direct current network system and control protection method |
| US11342744B2 (en) | 2018-06-13 | 2022-05-24 | Nr Electric Co., Ltd | Multi-voltage level direct current grid system and control protection method |
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