JPH02174562A - Voltage type converter - Google Patents
Voltage type converterInfo
- Publication number
- JPH02174562A JPH02174562A JP63329773A JP32977388A JPH02174562A JP H02174562 A JPH02174562 A JP H02174562A JP 63329773 A JP63329773 A JP 63329773A JP 32977388 A JP32977388 A JP 32977388A JP H02174562 A JPH02174562 A JP H02174562A
- Authority
- JP
- Japan
- Prior art keywords
- potential side
- converter
- conductor
- arm
- low potential
- 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.)
- Pending
Links
- 239000004020 conductor Substances 0.000 claims abstract description 32
- 239000003990 capacitor Substances 0.000 claims abstract description 25
- 230000008878 coupling Effects 0.000 claims abstract description 17
- 238000010168 coupling process Methods 0.000 claims abstract description 17
- 238000005859 coupling reaction Methods 0.000 claims abstract description 17
- 239000004065 semiconductor Substances 0.000 abstract description 12
- 230000015556 catabolic process Effects 0.000 abstract 1
- 230000006378 damage Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Inverter Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
Description
【発明の詳細な説明】
[発明の目的]
(産業上の利用分野)
本発明は交直変換装置等に使用される電圧形変換器に係
シ、特に故障時に直流コンデンサの放電電流のd i/
d tを抑制出来る電圧形変換器に関する。[Detailed Description of the Invention] [Objective of the Invention] (Industrial Field of Application) The present invention relates to a voltage source converter used in an AC/DC converter, etc., and particularly relates to a voltage source converter used in an AC/DC converter, etc.
This invention relates to a voltage source converter that can suppress dt.
(従来の技術)
直流送電等の用途においては、送電損失の点から極力直
流電圧を上げ電流を小さくする方式が取られる。この為
交直変換装置として電圧形変換器を用いる場合、電圧形
変換器を直列接続して使用することが考えられる。(Prior Art) In applications such as direct current power transmission, a method is adopted in which the direct current voltage is increased as much as possible and the current is reduced in order to reduce power transmission loss. For this reason, when using a voltage source converter as an AC/DC converter, it is conceivable to connect the voltage source converters in series.
第4図は一般的な電圧形変換器の直列接続構成を表わし
た図である。図において、1は直流回路、2及び5は直
流コンデンサ、3A〜3F及び6A〜6Fは電圧形変換
器のブリツノを構成するGTO等の半導体素子で構成さ
れるアームであり、4゜7は変換器用変圧器、8は交流
回路である。FIG. 4 is a diagram showing a typical series connection configuration of voltage source converters. In the figure, 1 is a DC circuit, 2 and 5 are DC capacitors, 3A to 3F and 6A to 6F are arms composed of semiconductor elements such as GTO that constitute the voltage source converter, and 4゜7 is a converter. The power transformer 8 is an AC circuit.
図のように構成された回路では、電圧形変換器のブリッ
ジアーム3八〜3F及び6A〜6Fを所定の順序でオン
、オフすることによシ順変換器運転及び逆変換器運転を
行ない電力を直流回路lから交流回路8へ供給したシ、
逆に交流回路8から直流回路1へ電力を供給したシする
ことができる。In the circuit configured as shown in the figure, forward converter operation and reverse converter operation are performed by turning on and off the bridge arms 38 to 3F and 6A to 6F of the voltage source converter in a predetermined order. is supplied from the DC circuit l to the AC circuit 8,
Conversely, power can be supplied from the AC circuit 8 to the DC circuit 1.
(発明が解決しようとする課題)
電圧形質換器が何らかの原因で、アーム3Aがオンして
いる期間においてアーム3Dが短絡したシ、A点が地絡
したシすると、直流コンデンサ2あるいは直流コンデン
サ2及び5がアーム3Aを通して短絡してしまう。この
短絡回路のインダクタンスは直流コンデンサと変換器ブ
リッジのインダクタンスのみで小さいので短絡電流のd
i/d tは極めて大きい。ところで電圧形質換器を
構成するアーム3A〜3F及び6八〜6Fには電流遮断
能力はあるが、その遮断電流には限界がある。従って、
この種の事故を検出して健全なアーム3Aによシ事故電
流を遮断しようとしても、di/dtが大きいので検出
遅れ等により事故電流がアーム3Aの遮断能力を越えて
しまい、アーム3Aを構成するGTO等の半導体スイッ
チの破壊に至る可能性がある。又遮断を行なわない場合
、アーム3Aを構成する半導体スイッチの過電流耐量以
下の事故電流が流れ、アーム3Aを構成する半導体スイ
ッチの破壊に至る可能性があった。(Problem to be Solved by the Invention) If for some reason in the voltage transformer, arm 3D is short-circuited while arm 3A is on, or point A is grounded, DC capacitor 2 or DC capacitor 2 and 5 are short-circuited through arm 3A. The inductance of this short circuit is small, consisting only of the DC capacitor and the converter bridge, so the short circuit current d
i/d t is extremely large. Incidentally, although the arms 3A to 3F and 68 to 6F constituting the voltage transformer have current interrupting ability, there is a limit to the interrupting current. Therefore,
Even if this type of fault is detected and an attempt is made to interrupt the fault current using a healthy arm 3A, the fault current will exceed the interrupting ability of the arm 3A due to a detection delay due to large di/dt, and the fault current will exceed the breaking capability of the arm 3A. This may lead to destruction of semiconductor switches such as GTO. In addition, if the interruption is not performed, a fault current that is less than the overcurrent withstand capacity of the semiconductor switch forming the arm 3A may flow, leading to destruction of the semiconductor switch forming the arm 3A.
本発明の目的は、前述のような事故に於て直流コンデン
サからの事故電流のdi/dtを抑制し、事故検出後ア
ームに電流遮断指令を与える時、事故電流がアームの遮
断電流限界以下とする、又は事故電流をアームの過電流
耐量以下とすることによジアームを構成する半導体素子
が破壊することのない電圧形質換器を提供することにあ
る。The purpose of the present invention is to suppress the di/dt of the fault current from the DC capacitor in the above-mentioned fault, and to ensure that when a current cutoff command is given to the arm after fault detection, the fault current is below the arm's cutoff current limit. It is an object of the present invention to provide a voltage transformer in which the semiconductor elements constituting the arm are not destroyed by reducing the fault current to less than the overcurrent withstand capacity of the arm.
[発明の構成]
(課題を解決するための手段)
前記目的を達成するために、本発明は第1図に示すよう
に一端が高電位側変換器9の正極に接続される高電位側
コンデンサ2の他端と前記高電位側変換器9の負極とを
接続する第1の導体12と、一端が低電位側変換器10
の負極に接続される低電位側コンデンサ5の他端と前記
低電位側変換器10の正極とを接続する第2の導体13
と、前記高電位側変換器9の負極と前記低電位側コンデ
ンサ5の他端とを接続する第3の導体14を具備し、前
記第1の導体12と第2の導体13とを電磁結合回路1
1等で磁気的に結合し且つ高電位側変換器9と低電位側
変換器10とを同相運転するようにしたものである。[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a high potential side capacitor whose one end is connected to the positive electrode of the high potential side converter 9 as shown in FIG. a first conductor 12 connecting the other end of the conductor 2 and the negative electrode of the high potential side converter 9;
a second conductor 13 connecting the other end of the low potential side capacitor 5 connected to the negative pole of the low potential side converter 10 and the positive pole of the low potential side converter 10;
and a third conductor 14 connecting the negative electrode of the high potential side converter 9 and the other end of the low potential side capacitor 5, and electromagnetically coupling the first conductor 12 and the second conductor 13. circuit 1
The converter 9 on the high potential side and the converter 10 on the low potential side are magnetically coupled with each other at a first order of magnitude, and are operated in the same phase.
(作用)
前述のように構成された本発明の電圧形質換器において
は、定常運転時には第1の導体12及び第2の導体13
はリアクトルとして作用することなく通常の接続導体と
して作用しているが、アム短絡或いはアーム地絡等の事
故が発生し、これに伴ってコンデンサ2或いはコンデン
サ5の電荷が放電する場合は、第1の導体12又は第2
の導体13を介して放電するため、第1の導体或いは第
2の導体13はリアクトルとして作用し、放電電流のd
i/d tを抑制する。(Function) In the voltage transformer of the present invention configured as described above, during steady operation, the first conductor 12 and the second conductor 13
acts as a normal connecting conductor without acting as a reactor, but if an accident such as an arm short circuit or an arm ground fault occurs and the charge in capacitor 2 or capacitor 5 is discharged as a result, the first conductor 12 or second
Since the discharge occurs through the conductor 13, the first conductor or the second conductor 13 acts as a reactor, and the discharge current d
Suppress i/d t.
(実施例)
第1図は本発明の一実施例を示す構成図で、図中1は直
流回路、2及び5は直流コンデンサ、3A〜3F及び6
A〜6Fは電圧形質換器のブリッジを構成するGTO等
の半導体素子で構成されるアームであり、各アームには
逆並列に帰還ダイオ一ドが接続されている。4,7は変
換器用変圧器、8は交流回路である。(Embodiment) Fig. 1 is a configuration diagram showing an embodiment of the present invention, in which 1 is a DC circuit, 2 and 5 are DC capacitors, 3A to 3F, and 6
A to 6F are arms composed of semiconductor elements such as GTO, which constitute the bridge of the voltage transformer, and feedback diodes are connected in antiparallel to each arm. 4 and 7 are converter transformers, and 8 is an AC circuit.
アーム3A〜3F及びこれに逆並列接続される帰還ダイ
オードから成る高電位側変換器9の負極とコンデンサ2
の他端とを第1の導体12で接続する。The negative terminal of the high potential side converter 9 consisting of arms 3A to 3F and a feedback diode connected in antiparallel to the arms 3A to 3F and the capacitor 2
The first conductor 12 connects the other end of the first conductor 12 to the other end of the first conductor 12 .
又アーム6A〜6F及びこれに逆並列接続される帰還ダ
イオードから成る低電位側変換器1oの正極とコンデン
サ5の他端とを第2の導体13で接続する。Further, the positive electrode of the low potential side converter 1o consisting of the arms 6A to 6F and a feedback diode connected in antiparallel to the arms 6A to 6F and the other end of the capacitor 5 are connected by a second conductor 13.
更K、コンデンサ5の他端と高電位側変換器9の負極と
を第3の導体J4で接続する。Furthermore, the other end of the capacitor 5 and the negative electrode of the high potential side converter 9 are connected by a third conductor J4.
そして、第1の導体I2と第2の導体13は磁気結合回
路11等で磁気的に結合する。The first conductor I2 and the second conductor 13 are magnetically coupled by a magnetic coupling circuit 11 or the like.
前述のように構成された第1図の電圧形質換器において
、定常運転時には高電位側変換器9と低電位側変換器1
0は図示されていない制御装置により同相運転を行なう
。In the voltage transformer of FIG. 1 configured as described above, the high potential side converter 9 and the low potential side converter 1 are connected during steady operation.
0 performs in-phase operation by a control device (not shown).
変換器の各部には第1図に示されるようにIdという直
流電流とil及びI2という高調波電流が流れる。ここ
で変換器9と10とが同相運転を行なうと11とi2は
等しい電流値となる。As shown in FIG. 1, a direct current Id and harmonic currents il and I2 flow through each part of the converter. Here, when converters 9 and 10 perform in-phase operation, 11 and i2 have the same current value.
電磁結合回路1ノの高電位側には高調波電流jlが又電
磁結合回路11の低電位側には高調波電流12及びId
が流れる。高調波電流1.と12は等しいため、電磁結
合回路11の高調波磁界は相互に打ち消し合い発生しな
い。又直流電流Idはそのdi/dtはほぼ零であるた
め、電磁結合回路11内に誘起電圧を発生しない。従っ
て、等制約に電磁結合回路11の存在は無視でき、従来
形の変換器同様、本発明による電圧形変換器は正常な運
転が可能である。A harmonic current jl is on the high potential side of the electromagnetic coupling circuit 1, and a harmonic current 12 and Id are on the low potential side of the electromagnetic coupling circuit 11.
flows. Harmonic current 1. Since and 12 are equal, the harmonic magnetic fields of the electromagnetic coupling circuit 11 cancel each other out and are not generated. Further, since the di/dt of the direct current Id is approximately zero, no induced voltage is generated within the electromagnetic coupling circuit 11. Therefore, the existence of the electromagnetic coupling circuit 11 can be ignored under the equality constraint, and the voltage source converter according to the present invention can be operated normally like the conventional converter.
次に、第2図に示されるように、アーム3Aが通電中に
アーム3Dが何等かの原因によシ短絡事故を発生したと
する。すると直流コンデンサ2から事故電流if、がア
ーム3A及び電磁結合回路11の高電位側を通り流れる
。この時、電磁結合回路11の低電位側に電磁誘導によ
り電流if2が流れる。変換器10のアーム6A、6E
及び6Fがオンしているとすると電流lf2は、電磁結
合回路1ノからアーム6A、変換器用変圧器7、アーム
6E及び6Fを通して流れる。この時電流if2は、変
換器用変圧器2の漏れインダクタンス及び交流回路8の
インダクタンスによシそのdi/dt 全抑制される。Next, as shown in FIG. 2, it is assumed that a short-circuit accident occurs in the arm 3D for some reason while the arm 3A is energized. Then, a fault current if flows from the DC capacitor 2 through the arm 3A and the high potential side of the electromagnetic coupling circuit 11. At this time, a current if2 flows on the low potential side of the electromagnetic coupling circuit 11 due to electromagnetic induction. Arms 6A, 6E of converter 10
and 6F are on, current lf2 flows from the electromagnetic coupling circuit 1 through the arm 6A, the converter transformer 7, and the arms 6E and 6F. At this time, the current if2 is completely suppressed by the leakage inductance of the converter transformer 2 and the inductance of the AC circuit 8.
事故電流Iflとif2とは等しくなければならないの
で事故電流iffのd i/d tも抑制される。Since the fault currents Ifl and if2 must be equal, d i/d t of the fault current if is also suppressed.
従って、図示されていない事故検出回路によって事故を
検出し、アーム3Aに事故電流遮断指令を与えた場合、
事故電流if、のd I /d tが抑制されているの
で1fIがアーム3Aの遮断能力を越える前に遮断でき
、アーム3Aを構成する半導体素子を破壊から保瑣でき
る。Therefore, when an accident is detected by an accident detection circuit (not shown) and a fault current cutoff command is given to arm 3A,
Since d I /d t of the fault current if is suppressed, it can be interrupted before 1fI exceeds the interrupting ability of the arm 3A, and the semiconductor elements constituting the arm 3A can be protected from destruction.
又、事故電流iffの流れる回路のインダクタンスが上
記の理由で増加するので、事故電流iflをアーム3A
の過電流耐量以下に抑制することが可能となシ、アーム
3Aを構成する半導体素子を破壊から保護出来る。Also, since the inductance of the circuit through which the fault current if flows increases due to the above reason, the fault current ifl is
Since the overcurrent can be suppressed to less than the overcurrent withstand capacity, the semiconductor elements constituting the arm 3A can be protected from destruction.
尚、本発明は変換器9のアーム短絡の場合について説明
したが、変換器lOのアーム短絡の場合も同様にして保
護が可能である。Although the present invention has been described with respect to the case where the arm of the converter 9 is short-circuited, protection can be similarly provided in the case where the arm of the converter 1O is short-circuited.
次に第3図に示されるようにアーム3Aが通電中に変換
器9の交流出力ブスがA点で地絡事故を発生したとする
。すると直流コンデンサ2からの事故電流If3がアー
ム3A、事故点A、大地、直流コンデンサ5、電磁結合
回路11の高圧側を通シ流れる。この時、電磁結合回路
11の低電位側に電磁誘導によシミ流if4が流れる。Next, suppose that a ground fault occurs in the AC output bus of the converter 9 at point A while the arm 3A is energized, as shown in FIG. Then, the fault current If3 from the DC capacitor 2 flows through the arm 3A, the fault point A, the ground, the DC capacitor 5, and the high voltage side of the electromagnetic coupling circuit 11. At this time, a stain current if4 flows on the low potential side of the electromagnetic coupling circuit 11 due to electromagnetic induction.
変換器10のアーム6に、6E及び6Fがオンしている
とすると、電流if4は電磁結合回路11からアーム6
A、変換器用変圧器7、アーム6A及び6Fを通して流
れる。この時、電流1f4は変換器用変圧器7の漏れイ
ンダクタンス及び交流回路8のインダクタンスによシそ
のd1/dtを抑制される。事故電流if3とlf4と
は等しくなければならないので、事故電流1fsのdi
/dtも抑制される。Assuming that 6E and 6F are on in arm 6 of converter 10, current if4 flows from electromagnetic coupling circuit 11 to arm 6.
A, flows through converter transformer 7, arms 6A and 6F. At this time, the current 1f4 has its d1/dt suppressed by the leakage inductance of the converter transformer 7 and the inductance of the AC circuit 8. Since the fault currents if3 and lf4 must be equal, the di of fault current 1fs is
/dt is also suppressed.
従って、図示されていない事故検出回路によって事故を
検出し、図示されていない保護回路によって、アーム3
Aに事故電流遮断指令を与えた場合、事故電流if3の
d i /d tが抑制されるのでif3がア一ム3A
の遮断能力を越える前に遮断出来アーム3Aを構成する
半導体素子を破壊から保護できる。Therefore, an accident detection circuit (not shown) detects an accident, and a protection circuit (not shown) detects an accident in the arm 3.
When a fault current cutoff command is given to A, d i /d t of the fault current if3 is suppressed, so if3 is
The semiconductor element constituting the arm 3A can be protected from destruction before it exceeds its breaking capacity.
又、事故電流1f3の流れる回路のインダクタンスが上
記の理由で増加するので、事故電流if3をアーム3A
の過電流耐量以下に抑制することが可能となシ、アーム
3Aを構成する半導体素子を破壊から保護できる。Also, since the inductance of the circuit through which the fault current 1f3 flows increases for the above reason, the fault current if3 is transferred to the arm 3A.
Since the overcurrent can be suppressed to less than the overcurrent withstand capacity, the semiconductor elements constituting the arm 3A can be protected from destruction.
尚、本発明は変換器9の交流出力ブスの地絡の場合につ
いて説明したが変換器10の交流出力ブスの地絡の場合
も同様にして保護が可能である。Although the present invention has been described in the case of a ground fault in the AC output bus of the converter 9, protection can be similarly provided in the case of a ground fault in the AC output bus of the converter 10.
[発明の効果]
以上説明したように、本発明によれば電圧形変換器が正
常運転している時は電磁結合回路は低インピーダンスで
あシ、通常の運転時の電流に対し影響を与えないが、ア
ーム短絡又は交流出力ブス地絡の場合は、事故電流のd
i/dtを抑制し、事故検出後アーム電流遮断指令を与
える時事故電流がアームの遮断限界電流以下とする、あ
るいは故障電流をアームの過電流耐量以下とすることに
よりアームを構成する半導体素子が破壊することがなく
保護が可能な電圧形変換器を提供することができる。[Effects of the Invention] As explained above, according to the present invention, when the voltage source converter is operating normally, the electromagnetic coupling circuit has low impedance and does not affect the current during normal operation. However, in the case of an arm short circuit or an AC output bus ground fault, the fault current d
By suppressing i/dt and making the fault current less than the arm's cutoff limit current when issuing an arm current cutoff command after detecting a fault, or making the fault current less than the arm's overcurrent withstand capacity, the semiconductor elements that make up the arm can A voltage source converter that can be protected without being destroyed can be provided.
第1図は本発明の一実施例を示す構成図、第2図及び第
3図は本発明の詳細な説明するための事故電流の流れる
経路を示した図、第4図は従来装置の構成を示した図で
ある。
1・・・直流回路、2,5・・・直流コンデンサ、3゜
6・・・アーム、4,7・・・変換器用変圧器、8・・
・交流回路、9,10・・・変換器ブリ、ジ、11・・
・電磁結合回路。Fig. 1 is a block diagram showing an embodiment of the present invention, Figs. 2 and 3 are diagrams showing the path through which fault current flows to explain the present invention in detail, and Fig. 4 is the configuration of a conventional device. FIG. 1... DC circuit, 2, 5... DC capacitor, 3゜6... Arm, 4, 7... Converter transformer, 8...
・AC circuit, 9, 10... converter bri, ji, 11...
・Electromagnetic coupling circuit.
Claims (1)
低電位側変換器とを直列接続して構成される電圧形変換
器において、一端が高電位側変換器の正極に接続される
高電位側コンデンサの他端と前記高電位側変換器の負極
とを接続する第1の導体と、一端が低電位側変換器の負
極に接続される低電位側コンデンサの他端と前記低電位
側変換器の正極とを接続する第2の導体と、前記高電位
側変換器の負極と前記低電位側コンデンサの他端とを接
続する第3の導体を具備し、前記第1の導体と第2の導
体とを磁気的に結合し且つ高電位側変換器と低電位側変
換器とを同相運転することを特徴とする電圧形変換器。In a voltage source converter configured by connecting in series a high potential side converter and a low potential side converter each equipped with a capacitor on the DC side, the high potential side converter has one end connected to the positive electrode of the high potential side converter. a first conductor connecting the other end of the capacitor and the negative electrode of the high potential side converter; and the other end of the low potential side capacitor, one end of which is connected to the negative electrode of the low potential side converter, and the low potential side converter. and a third conductor that connects the negative electrode of the high potential side converter and the other end of the low potential side capacitor, the first conductor and the second conductor are connected to each other. A voltage source converter characterized by magnetically coupling a conductor and operating a high potential side converter and a low potential side converter in phase.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63329773A JPH02174562A (en) | 1988-12-27 | 1988-12-27 | Voltage type converter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63329773A JPH02174562A (en) | 1988-12-27 | 1988-12-27 | Voltage type converter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02174562A true JPH02174562A (en) | 1990-07-05 |
Family
ID=18225104
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63329773A Pending JPH02174562A (en) | 1988-12-27 | 1988-12-27 | Voltage type converter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02174562A (en) |
-
1988
- 1988-12-27 JP JP63329773A patent/JPH02174562A/en active Pending
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