JP2875070B2 - Superconducting coil protection device - Google Patents
Superconducting coil protection deviceInfo
- Publication number
- JP2875070B2 JP2875070B2 JP21764891A JP21764891A JP2875070B2 JP 2875070 B2 JP2875070 B2 JP 2875070B2 JP 21764891 A JP21764891 A JP 21764891A JP 21764891 A JP21764891 A JP 21764891A JP 2875070 B2 JP2875070 B2 JP 2875070B2
- Authority
- JP
- Japan
- Prior art keywords
- superconducting coil
- coil
- converter
- energy
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Containers, Films, And Cooling For Superconductive Devices (AREA)
- Protection Of Static Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、超電導コイルの保護装
置に係り、特に超電導コイルの常電導状態への転移等の
故障時における超電導コイルの保護装置に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for protecting a superconducting coil, and more particularly to a device for protecting a superconducting coil in the event of a failure such as a transition of the superconducting coil to a normal conducting state.
【0002】[0002]
【従来の技術】一般に超電導コイルの抵抗分はほとんど
零に近いため、コイルの時定数が非常に大きい、そのた
め、超電導コイルに直流電流を流して環流させてエネル
ギを貯蔵し、電力のピ―ク負荷対策や系統の安定化に用
いることが考えられている。2. Description of the Related Art In general, since the resistance of a superconducting coil is almost zero, the time constant of the coil is very large. Therefore, a direct current is passed through the superconducting coil to circulate the energy and store the energy, thereby peaking the power. It is considered to be used for load countermeasures and system stabilization.
【0003】このような超電導コイルによるエネルギ貯
蔵システム(以下単にSMESと記す)においては、従
来はサイリスタ等で構成された変換装置で、コイルへの
エネルギの貯蔵及びコイルからのエネルギの取出しを行
っている。[0003] In such an energy storage system using a superconducting coil (hereinafter simply referred to as SMES), a conversion device conventionally constituted by a thyristor or the like stores energy in the coil and extracts energy from the coil. I have.
【0004】従来のSMESの構成を図2に示す。図2
におて、1は交流母線、2は交流しゃ断器、3は整流器
用変圧器、4はサイリスタ等で構成された変換装置、5
は超電導コイル、6は直流しゃ断器、7は抵抗、8はス
イッチである。FIG. 2 shows the configuration of a conventional SMES. FIG.
Here, 1 is an AC bus, 2 is an AC circuit breaker, 3 is a transformer for a rectifier, 4 is a converter composed of a thyristor or the like, 5
Is a superconducting coil, 6 is a DC circuit breaker, 7 is a resistor, and 8 is a switch.
【0005】図2を用いてシステムの運転を説明する。
超電導コイル5にエネルギを注入する場合は、変換装置
4を順変換運転する。エネルギの注入が終了し蓄積する
場合は、図2に図示されていない短絡スイッチで超電導
コイルの両端を短絡し、電流を環流させる。超電導コイ
ル5に蓄積したエネルギを交流系統に回生する場合は前
記短絡スイッチを開き、変換装置4を逆変換運転する。The operation of the system will be described with reference to FIG.
When injecting energy into the superconducting coil 5, the converter 4 is operated in the forward conversion mode. When the energy injection is completed and the energy is accumulated, both ends of the superconducting coil are short-circuited by a short-circuit switch not shown in FIG. 2 to circulate the current. When the energy stored in the superconducting coil 5 is regenerated to the AC system, the short-circuit switch is opened and the conversion device 4 is operated in reverse conversion.
【0006】ところで、超電導コイル5では、臨界電流
を超えて通電した場合等、各種原因によって超電導コイ
ル5の一部が常電導に転移し、抵抗分を持つ現象がしば
しば発生する。すると、超電導コイル5に蓄えられてい
たエネルギが、常電導に転移した部分でジュ―ル熱に交
換され発熱し、超電導コイル5の焼損や、冷媒であるヘ
リウムの気化による爆発等の事故を招く、このような事
故を防止するために超電導コイル5に蓄えられたエネル
ギを速やかにコイル外へ排出することが重要である。In the superconducting coil 5, a part of the superconducting coil 5 transitions to normal conduction due to various causes, such as when a current exceeds a critical current, and a phenomenon having a resistance component often occurs. Then, the energy stored in the superconducting coil 5 is exchanged into Joule heat at the portion where normal conduction has been transferred, and heat is generated, causing accidents such as burning of the superconducting coil 5 and explosion due to vaporization of helium as a refrigerant. In order to prevent such an accident, it is important to quickly discharge the energy stored in the superconducting coil 5 out of the coil.
【0007】従来は、これを2つの方法で行っていた。
その方法を図2を用いて説明する。まず第1の方法は図
2における変換装置4を逆変換運転し、超電導コイル5
のエネルギを交流母線1に回生する方法である。Conventionally, this has been done in two ways.
The method will be described with reference to FIG. First, in the first method, the conversion device 4 in FIG.
Is regenerated to the AC bus 1.
【0008】第2の方法は、変換装置4をバイパスペア
運転とし、コイル電流を環流させスイッチ8を投入した
後、直流しゃ断器6を開いてコイル電流を抵抗器71 と
スイッチ8のパスに転流させて、コイルエネルギを抵抗
器71 で消費させる方法である。ここで、バイパスペア
運転とは、交流同一相に接続された上下の素子を通電さ
せる運転方式である。In the second method, the converter 4 is set to the bypass pair operation, the coil current is circulated, the switch 8 is turned on, the DC circuit breaker 6 is opened, and the coil current is transferred to the path between the resistor 71 and the switch 8. In this method, the coil energy is consumed by the resistor 71. Here, the bypass pair operation is an operation method in which the upper and lower elements connected to the same AC phase are energized.
【0009】[0009]
【発明が解決しようとする課題】変換装置4をGTOで
構成した場合も同様の保護方法が考えられる。しかし交
流側にエネルギを回生する第1の方法においては、蓄積
エネルギ量が増すにつれで回生しなくてはならないエネ
ルギ量も増し、系統安定用に接続されたSMESが系統
に外乱を与える可能性を持つという不具合を生じる。A similar protection method is conceivable when the conversion device 4 is made of GTO. However, in the first method of regenerating energy on the AC side, as the amount of stored energy increases, the amount of energy that must be regenerated also increases, and the possibility that SMES connected for system stabilization causes disturbance to the system. The problem of having it occurs.
【0010】又、第2の直流しゃ断器6を用いて、コイ
ル電流を抵抗器71 に転流させる方法についても、今後
直流しゃ断器6が信頼性向上のために半導体化された時
に、通常運転時の直流しゃ断器による損失がシステムの
性質上無視できない問題になる。A method of using the second DC circuit breaker 6 to commutate the coil current to the resistor 71 will be described in the future when the DC circuit breaker 6 is made into a semiconductor for improving the reliability. The loss due to the DC breaker at the time becomes a problem that cannot be ignored due to the nature of the system.
【0011】コイルの保護上コイル電流を急速に減衰さ
せる目的からは抵抗値が大きい方が望ましいが、抵抗値
を大きくすればそれだけ発生する電圧が高くなりコイル
の耐電圧より、抵抗の上限値が制限される。従って、本
発明の目的は、前記不具合を解消し常電導発生時等の故
障時の新しい超電導コイルの保護装置を提供することに
ある。In order to rapidly attenuate the coil current for protection of the coil, it is desirable that the resistance value be large. However, as the resistance value is increased, the generated voltage becomes higher, and the upper limit value of the resistance is higher than the withstand voltage of the coil. Limited. Accordingly, it is an object of the present invention to provide a new superconducting coil protection device which solves the above-mentioned problems and which is in the event of a failure such as when normal conduction occurs.
【0012】[0012]
【課題を解決するための手段】本発明は、上記目的を達
成するために、交流側端子が交流しゃ断器を介して交流
系統に接続され、直流端子側に超電導コイルが接続され
る半導体素子によって構成される変換装置を備え、前記
交流系統と前記超電導コイル間でエネルギの授受を行う
装置において、前記超電導コイルに並列接続される非線
形抵抗と、前記超電導コイルが常電導に転移したことを
検出する常電導転移検出回路と、この常電導転移検出回
路に応答し前記変換装置にバイパスペア運転指令を出す
手段と、これらの指令から時間遅れを持って前記変換装
置にゲ―トブロック指令を出す手段を具備したものであ
る。According to the present invention, there is provided a semiconductor device having an AC terminal connected to an AC system via an AC circuit breaker and a superconducting coil connected to the DC terminal. A device configured to transmit and receive energy between the AC system and the superconducting coil, wherein a non-linear resistance connected in parallel to the superconducting coil and a transition of the superconducting coil to normal conduction are detected. A normal conduction transition detecting circuit, a means for issuing a bypass pair operation command to the converter in response to the normal conduction transition detecting circuit, and a means for issuing a gate block command to the converter with a time delay from these instructions. It is provided.
【0013】[0013]
【作用】前述のように構成することにより、非直線抵抗
器の制限電圧を変換装置の出力電圧以上に選べは、超電
導状態では、非直線抵抗には電流が流れない。超電導コ
イルが常電導に転移すれば、超電導コイルに並列に接続
される非直線抵抗器の制限電圧値は一定であるため、変
換装置のバイパスペア運転が解除され変換装置の消弧時
の過電圧は抑制され、超電導コイル電流の減衰して行く
過程でも非直線抵抗の制限電圧は一定であるため超電導
コイル電流の減衰は速くなる。With the above arrangement, if the limiting voltage of the nonlinear resistor can be selected to be higher than the output voltage of the converter, no current flows through the nonlinear resistor in the superconducting state. If the superconducting coil transitions to normal conduction, the limiting voltage value of the non-linear resistor connected in parallel with the superconducting coil is constant, so the bypass pair operation of the converter is canceled and the overvoltage at the time of arc extinguishing of the converter is Even when the superconducting coil current is attenuated, the limiting voltage of the non-linear resistance is constant, so that the superconducting coil current attenuates faster.
【0014】[0014]
【実施例】以下、変発明の一実施例を図1のブロック図
を参照して説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention will be described below with reference to the block diagram of FIG.
【0015】図1において、1は交流母線、2は交流し
ゃ断器、3は整流器用変圧器、4はサイリスタ或いはG
TO等の半導体素子によって構成されている変換装置、
5は超電導コイル、72 は非線形抵抗器、9は常電導転
移検出回路、例えば、クウェンチ検出回路9で検出する
と変換装置4にバイパスペア運転指令52を出力する。
変換装置4をバイパスペア運転することによって交流系
統と超電導コイル5とのつながりを絶つ。そのままでは
コイル電流は変換装置4を流れるだけでエネルギの消費
が行われないため、変換装置4を停止し、コイル電流を
非線形抵抗器72 に転流させる必要がある。In FIG. 1, 1 is an AC bus, 2 is an AC circuit breaker, 3 is a rectifier transformer, and 4 is a thyristor or G
A conversion device constituted by a semiconductor element such as TO,
5 is a superconducting coil, 72 is a non-linear resistor, and 9 is a normal conduction transition detecting circuit, for example, a quench detecting circuit 9, and outputs a bypass pair operation command 52 to the converter 4 when detected.
The connection between the AC system and the superconducting coil 5 is cut off by operating the converter 4 in a bypass pair. Since the coil current only flows through the converter 4 without consuming energy as it is, it is necessary to stop the converter 4 and divert the coil current to the nonlinear resistor 72.
【0016】図1の実施例では、遅延回路10にて交流
母線電流が零となる時間遅れをおいて、ゲ―トブロック
指令53を出力している。変換装置4が停止すれば、コ
イル電流は非線形抵抗器72 へ転流してコイルエネルギ
を非線形抵抗器72 で消費させ、コイルを保護すること
ができる。In the embodiment shown in FIG. 1, the delay circuit 10 outputs the gate block command 53 after a time delay at which the AC bus current becomes zero. When the converter 4 stops, the coil current is diverted to the non-linear resistor 72 and the coil energy is consumed by the non-linear resistor 72 to protect the coil.
【0017】コイル電圧は非線形抵抗器72 の制限電圧
により、規定値以下に制限される。またコイル電流が減
衰しても、非線形抵抗器72 の制限電圧は一定なのでコ
イル電流は、通常の場合に比べ急速に減衰させることが
できる。又、本発明はコイルの常電導状態への転移時の
みならず、コイルに過電圧が発生した時等、種々の故障
時にも適用できるものである。The coil voltage is limited to a specified value or less by the limiting voltage of the nonlinear resistor 72. Even if the coil current is attenuated, the coil current can be attenuated more rapidly than in the normal case because the limiting voltage of the nonlinear resistor 72 is constant. The present invention can be applied not only to the transition of the coil to the normal conduction state, but also to various failures such as when an overvoltage occurs in the coil.
【0018】[0018]
【発明の効果】以上説明のように本発明の超電導コイル
の保護装置によれば、超電導コイルが常電導に転移すれ
ば、超電導コイルに並列接続される非線形抵抗器の制限
電圧は一定であるため、変換装置のバイパスペア運転が
解除され変換装置が消弧しても過電圧は発生することな
く、超電導コイル電流が減衰しても超電導コイルに並列
接続される非線形抵抗器の抵抗値は等価的に大きくなる
ため超電導コイル電流の減衰を速くすることができる。
又、従来方式の図2に示すスイッチ8を省略することが
できる。As described above, according to the superconducting coil protection device of the present invention, if the superconducting coil shifts to normal conduction, the limiting voltage of the nonlinear resistor connected in parallel to the superconducting coil is constant. Even if the converter is released from bypass pair operation and the converter is extinguished, no overvoltage occurs, and even if the superconducting coil current attenuates, the resistance of the non-linear resistor connected in parallel to the superconducting coil is equivalent. Since it becomes large, the decay of the superconducting coil current can be accelerated.
Also, the switch 8 of the conventional system shown in FIG. 2 can be omitted.
【図1】本発明の一実施例を示す超電導コイルの保護装
置のブロック図。FIG. 1 is a block diagram of a protection device for a superconducting coil according to an embodiment of the present invention.
【図2】従来の超電導コイルシステムのブロック図。FIG. 2 is a block diagram of a conventional superconducting coil system.
1 …交流母線 2 …交流しゃ
断器 3 …整流器用変圧器 4 …変換装置 5 …超電導コイル 6 …直流しゃ
断器 71 …抵抗器 72 …非線形抵
抗器 8 …スイッチ 9 …常電導転
移検出回路 10 …遅延回路 52 …バイパス
ペア指令 53 …ゲ―トブロック指令DESCRIPTION OF SYMBOLS 1 ... AC bus 2 ... AC circuit breaker 3 ... Rectifier transformer 4 ... Converter 5 ... Superconducting coil 6 ... DC circuit breaker 71 ... Resistor 72 ... Non-linear resistor 8 ... Switch 9 ... Normal conduction transition detection circuit 10 ... Delay Circuit 52… Bypass pair command 53… Gate block command
Claims (1)
流系統に接続され、直流側端子に超電導コイルが接続さ
れる半導体素子によって構成される変換装置を備え、前
記交流系統と前記超電導コイル間でエネルギの授受を行
なう装置において、前記超電導コイルに並列接続される
非線形抵抗と、前記超電導コイルが常電導に転移したし
たことを検出する常電導転移検出回路と、この常電導転
移検出回路に応答し前記変換装置に停止指令を出す手段
を具備して成る超電導コイルの保護装置。1. A conversion device comprising a semiconductor element having an AC terminal connected to an AC system via an AC circuit breaker and a superconducting coil connected to the DC terminal, wherein a converter is provided between the AC system and the superconducting coil. A non-linear resistor connected in parallel to the superconducting coil, a normal-conducting transition detecting circuit for detecting that the superconducting coil has shifted to normal conduction, and a response to the normal-conducting transition detecting circuit. A superconducting coil protection device comprising means for issuing a stop command to the conversion device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21764891A JP2875070B2 (en) | 1991-08-29 | 1991-08-29 | Superconducting coil protection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21764891A JP2875070B2 (en) | 1991-08-29 | 1991-08-29 | Superconducting coil protection device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0555033A JPH0555033A (en) | 1993-03-05 |
JP2875070B2 true JP2875070B2 (en) | 1999-03-24 |
Family
ID=16707554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21764891A Expired - Lifetime JP2875070B2 (en) | 1991-08-29 | 1991-08-29 | Superconducting coil protection device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2875070B2 (en) |
-
1991
- 1991-08-29 JP JP21764891A patent/JP2875070B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0555033A (en) | 1993-03-05 |
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