JPS6311855B2 - - Google Patents
Info
- Publication number
- JPS6311855B2 JPS6311855B2 JP54014270A JP1427079A JPS6311855B2 JP S6311855 B2 JPS6311855 B2 JP S6311855B2 JP 54014270 A JP54014270 A JP 54014270A JP 1427079 A JP1427079 A JP 1427079A JP S6311855 B2 JPS6311855 B2 JP S6311855B2
- Authority
- JP
- Japan
- Prior art keywords
- power transmission
- current
- current command
- command value
- voltage
- 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
Links
- 230000007935 neutral effect Effects 0.000 claims description 20
- 230000005540 biological transmission Effects 0.000 claims description 19
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000002242 deionisation method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Direct Current Feeding And Distribution (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は直流送電装置の制御装置に係り、特に
中性線で地絡事故が発生したときに変換装置の運
転を停止することなく事故除去を行うことのでき
る直流送電装置の制御装置に関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a control device for a DC power transmission device, and in particular, to a control device for a DC power transmission device, and in particular, to a method for eliminating the fault without stopping the operation of a converter when a ground fault occurs in a neutral line. The present invention relates to a control device for a DC power transmission device that can perform the following operations.
本発明の従来技術を第１図を参照して説明す
る。図において、１，２は交流系統、３〜６は変
圧器、７〜１０は交流変換器、１１〜１４は直流
リアクトル、１５は本線の直流送電線、１６は中
性線の直流送電線、１７はサージキヤパシタン
ス、１８はスイツチである。このような系統にお
いて中性線の例えばｆ点で地絡事故が発生した場
合、従来、直流系を一旦停止して、消イオン時間
（200〜250ｍｓ）経過の後、再び直流系を再起動
するか、または、図示のようにサージキヤパシタ
に並列に遮断器を設置し、事故発生時はこの遮断
器を閉じて中性線の電圧を強制的に零とすると同
時に流れる電流も零として事故除去を行う方法が
考えられている。しかし、前者の方法では事故除
去は確実に行われるが直流系の運転を停止するた
め交流系の過渡安定度が悪くなる場合がある他、
直流系の信頼性が低下する問題がある。これに対
して後者の方法では直流系の運転を停止する必要
はないが、高価な遮断器が必要となることから不
経済であり、また、機械的な接点をもつため信頼
性が問題となる。
The prior art of the present invention will be explained with reference to FIG. In the figure, 1 and 2 are AC systems, 3 to 6 are transformers, 7 to 10 are AC converters, 11 to 14 are DC reactors, 15 is a main DC transmission line, 16 is a neutral DC transmission line, 17 is a surge capacitance, and 18 is a switch. If a ground fault occurs in such a system, for example at point f of the neutral line, conventionally the DC system is temporarily stopped and restarted again after deionization time (200 to 250 ms) has elapsed. Alternatively, as shown in the diagram, a circuit breaker is installed in parallel with the surge capacitor, and when an accident occurs, this circuit breaker is closed to force the neutral line voltage to zero, and at the same time, the current flowing through it is also zero to eliminate the accident. A method is being considered. However, although the former method reliably eliminates accidents, it may deteriorate the transient stability of the AC system because it stops the operation of the DC system.
There is a problem that the reliability of the DC system decreases. On the other hand, the latter method does not require stopping the operation of the DC system, but it is uneconomical because it requires an expensive circuit breaker, and reliability is a problem because it has mechanical contacts. .
本発明の目的は、上記した従来技術の不都合な
点を除き、簡単な回路の追加により、直流系を停
止することなく確実に事故除去を行うことのでき
る直流送電装置の制御装置を提供するにある。
An object of the present invention is to provide a control device for a DC power transmission device that eliminates the disadvantages of the prior art described above and can reliably eliminate faults without stopping the DC system by adding a simple circuit. be.
本発明の特徴は中性線で地絡事故が生じたと
き、バイポーラ運転している両直流送電装置の電
流指令値を夫々交互に小さく、又は、一方の電流
指令値を中心に他方の電流指令値を増減され、中
性線及び事故点に交流電流を流すことにより、電
圧と電流の零点を強制的に作り出すことによつ
て、自然に事故除去が行なえるようにしたところ
にある。
The feature of the present invention is that when a ground fault occurs in the neutral line, the current command values of both DC power transmission devices operating in bipolar operation are alternately decreased, or the current command value of one is centered and the current command of the other is By increasing or decreasing the value and flowing alternating current through the neutral wire and the fault point, the fault can be removed naturally by forcibly creating a zero point of voltage and current.
本発明の一実施例を第２図に示す。第１図と同
じ番号のものは同じものを示すので異つたものに
ついてのみ説明すると、２００は直流送電装置の
運転状態を指令するための運転指令回路、２０１
はこの運転指令回路の出力の直流電流の指令値か
ら後述する電流マージンΔIdを減ずるための加算
器、２０２，２０３はそれぞれ各極の直流電流を
検出するための直流電流変成器、２０４，２０５
は定電流制御回路、２０６，２０７はそれぞれ各
極の直流電圧を検出する直流電圧変成器、２０
８，２０９は定電圧制御回路、２１０は交流系統
の電圧を検出するための交流電圧変成器、２１
１，２１２はそれぞれ交直変換器３１，３２が逆
変換器運転のとき変換器動作が安定に行えるため
の最小の余裕角γnioを与えるための定余裕角制御
回路で、この動作は前述の定電圧制御動作のバツ
クアツプとなる。２１３，２１４は最低電圧検出
回路で、交直変換器３１，３２が順変換器運転の
ときは定電流制御回路の出力、逆変換器運転のと
きは定電圧制御回路の出力が通常この回路で検出
される。２１５，２１６は自動パルス移相器、２
１７，２１８はパルス増幅器、２１９は順変換器
と逆変換器との電流指令値の差を与える電流マー
ジン設定器、２２０は運転指令回路２００の指令
により交直変換器３１，３２が順変換器運転のと
きオフ、逆変換器運転のときオンとなるスイツ
チ、２２１は中性線の地絡事故を検出するための
装置、２２２はこの中性線の地絡事故検出装置が
地絡事故検出により出力を出しているTfの期間
スイツチ２２５，２２６をオン、オフする信号を
出力する発振器、２２３はスイツチ２２５と２２
６を交互にオン、オフされるインバータ、２２４
は中性線で地絡事故発生時に中性線に流す電流を
指令するための電圧設定器、２２７，２２８はそ
れぞれ運転指令回路２００からの電流指令値をス
イツチ２２５，２２６の出力で減じるための加算
器である。以上、第２図では１変換所における制
御回路のみを説明したが、同様な回路が相手の変
換所にもあるものとし、両変換所に必要な信号は
不記の伝送装置を介して互いに授受されているも
のとする。
An embodiment of the present invention is shown in FIG. Components with the same numbers as in FIG. 1 indicate the same components, so only the different components will be explained. 200 is an operation command circuit for commanding the operating state of the DC power transmission device; 201
202 and 203 are DC current transformers for detecting the DC current of each pole; 204 and 205 are respectively
20 is a constant current control circuit; 206 and 207 are DC voltage transformers that detect the DC voltage of each pole;
8, 209 is a constant voltage control circuit, 210 is an AC voltage transformer for detecting the voltage of the AC system, 21
Reference numerals 1 and 212 are constant margin angle control circuits for providing the minimum margin angle γ nio for stable converter operation when the AC/DC converters 31 and 32 are in reverse converter operation, and this operation is based on the above-mentioned constant margin angle. This results in backup of voltage control operation. 213 and 214 are minimum voltage detection circuits, which normally detect the output of the constant current control circuit when the AC/DC converters 31 and 32 are in forward converter operation, and the output of the constant voltage control circuit when they are in reverse converter operation. be done. 215, 216 are automatic pulse phase shifters, 2
17 and 218 are pulse amplifiers; 219 is a current margin setting device that provides a difference in current command value between the forward converter and the inverse converter; and 220 is a current margin setting device that causes the AC/DC converters 31 and 32 to operate as the forward converter according to a command from the operation command circuit 200. 221 is a device for detecting a ground fault in the neutral line, and 222 is a switch that is turned off when the inverter is in operation, and 222 is a switch that is turned on when the neutral line is ground fault detected. 223 is an oscillator that outputs a signal to turn on and off switches 225 and 226 during the period of T f that is outputting T f.
6, an inverter that is alternately turned on and off, 224
227 and 228 are voltage setting devices for commanding the current to flow through the neutral wire when a ground fault occurs in the neutral wire, and 227 and 228 are voltage setting devices for reducing the current command value from the operation command circuit 200 by the output of switches 225 and 226, respectively. It is an adder. In the above, only the control circuit at one converter station has been explained in Figure 2, but it is assumed that a similar circuit exists at the other converter station, and the signals necessary for both converters are exchanged with each other via a transmission device (not shown). It is assumed that
この回路の動作を第３図と第４図を用いて説明
する。第３図は定常状態時における直流回路を流
れる電流の分布を示した図で、ａは通常運転時、
ｂは中性線のｆ点で地絡事故が接続した場合を示
している。通常のバイポーラ運転時は一方の極を
流れる電流i1と地方の極を流れる電流i2は運転指
令回路２００からの電流指令値Idに応じた電流が
流れ、中性線には電流は流れない。 The operation of this circuit will be explained using FIGS. 3 and 4. Figure 3 is a diagram showing the distribution of current flowing through a DC circuit in steady state, where a is during normal operation;
b shows a case where a ground fault occurs at point f of the neutral wire. During normal bipolar operation, the current i1 flowing through one pole and the current i2 flowing through the local pole correspond to the current command value Id from the operation command circuit 200, and no current flows through the neutral wire. do not have.
次に、中性線のｆ点で地絡事故が発生した場合
の本発明の動作を説明する。地絡事故が発生する
と、地絡事故検出装置２２１が働き、前もつて定
められた時間Tf（例えば300ｍｓ〜500ｍｓ）の
間、出力はハイレベルＨとなる。これによつて発
振器２２２が時間Tfの間動作し発振周波数ｆ
（１／Ｔ）で発振する。この発振器２２２の出力
はスイツチ２２５をオン、オフする。一方、イン
バータ２２３により駆動されるスイツチ２２６
は、スイツチ２２５とは逆にオンのときオフ、オ
フのときオンとなり互い違いにオン、オフを行
う。このため、各々の極を流れる電流はスイツチ
の動作に応じて電圧設定器２２４で設定された値
に相当する電流でけ小さくなる、したがつて、中
性線（及び故障点）には、第３図ｂ及び第４図の
ように、交流電流i1−i2が流れる。これにより、
故障点の電圧及び電流に強制的に零点を作ること
ができ、地絡事故を除去することができる。t2の
時点で事故が除去されると、事故点の電圧vfは中
性線を流れる電流の大きさに応じて電圧が現われ
ることになる。 Next, the operation of the present invention when a ground fault occurs at point f of the neutral line will be described. When a ground fault occurs, the ground fault detection device 221 operates, and the output becomes high level H for a predetermined time T f (for example, 300 ms to 500 ms). As a result, the oscillator 222 operates for a time T f and the oscillation frequency f
It oscillates at (1/T). The output of this oscillator 222 turns a switch 225 on and off. On the other hand, a switch 226 driven by an inverter 223
Contrary to the switch 225, when the switch is on, it is off and when it is off, it is on, and is alternately turned on and off. Therefore, the current flowing through each pole will be reduced by the current corresponding to the value set by the voltage setter 224 depending on the operation of the switch. As shown in FIG. 3b and FIG. 4, alternating currents i 1 -i 2 flow. This results in
A zero point can be forcibly created in the voltage and current at the fault point, and earth faults can be eliminated. If the fault is removed at time t 2 , the voltage v f at the fault point will appear depending on the magnitude of the current flowing through the neutral wire.
このように、本発明によれば、地絡事故が発生
したとき、両変換装置の電流指令を交互に減少す
なわち脈動させるだけで、強制的に零点を作り出
し、事故除去を行うことができる。 As described above, according to the present invention, when a ground fault occurs, the fault can be removed by forcibly creating a zero point simply by alternately decreasing or pulsating the current commands of both converters.
第２図の実施例ではバイポーラ運転を行う両極
の電流指令値を交互に小さくするものであつた
が、変換器が短時間過負荷運転可能なものについ
ては、第５図に示すように一方の極の電流指令値
のみを定格値のまわりで増減さすことにより第２
図と同じ効果を出すこともできる。第２図と異な
るところはスイツチ２２５の出力が片極の電流指
令値に加算器２２８を通して加算されている点の
みで、動作は第２図と同様となる。したがつて、
この場合も直流系を停止することなく中性線の事
故を除去することができる。 In the embodiment shown in Fig. 2, the current command value at both poles for bipolar operation is alternately reduced, but if the converter is capable of short-term overload operation, one By increasing or decreasing only the pole current command value around the rated value, the second
You can also create the same effect as shown in the figure. The only difference from FIG. 2 is that the output of switch 225 is added to the unipolar current command value through adder 228, and the operation is the same as in FIG. Therefore,
In this case as well, neutral line accidents can be eliminated without stopping the DC system.
本発明によれば、電圧と電流の零点を作り出す
ことができるので、直流系を停止することなく自
然に事故除去を行うことができる。
According to the present invention, since a zero point of voltage and current can be created, it is possible to naturally eliminate an accident without stopping the DC system.
第１図は、従来例を説明するための図、第２図
は、本発明の一実施例を示す図、第３図は定常状
態における電流の分布を示す図、第４図は、第２
図の回路動作を示す図、第５図は、本発明の他の
実施例を示す図である。
２００……運転指令回路、２０１，２２７，２
２８……加算器、２０２，２０３……直流電流変
換器、２０４，２０５……定電流制御回路、２０
６，２０７……直流電圧変成器、２０８，２０９
……定電圧制御回路、２１０……交流電圧変成
器、２１１，２１２……定余裕角制御回路、２１
３，２１４……最低電圧検出回路、２１５，２１
６……自動パルス移相器、２１７，２１８……パ
ルス増幅器、２１９……電流マージン設定器、２
２０，２２５，２２６……スイツチ、２２１……
中性線地絡事故検出装置、２２２……発振器、２
２３……インバータ、２２４……電圧設定器。
FIG. 1 is a diagram for explaining a conventional example, FIG. 2 is a diagram showing an embodiment of the present invention, FIG. 3 is a diagram showing a current distribution in a steady state, and FIG.
FIG. 5 is a diagram showing another embodiment of the present invention. 200... Operation command circuit, 201, 227, 2
28... Adder, 202, 203... DC current converter, 204, 205... Constant current control circuit, 20
6,207...DC voltage transformer, 208,209
... Constant voltage control circuit, 210 ... AC voltage transformer, 211, 212 ... Constant margin angle control circuit, 21
3,214...Minimum voltage detection circuit, 215,21
6... Automatic pulse phase shifter, 217, 218... Pulse amplifier, 219... Current margin setter, 2
20,225,226...switch, 221...
Neutral wire ground fault detection device, 222... Oscillator, 2
23...Inverter, 224...Voltage setting device.
Claims (1)
直流送電装置を２組備え、両送電装置の中性線を
共通にしてバイポーラ運転するものにおいて、中
性線で地線事故が発生したことを検出する手段
と、該手段に応じて上記２組の直流送電装置の電
流指令値を夫々交互に小さくする手段とを備えた
ことを特徴とする直流送電装置の制御装置。 ２ 電流指令値に応じて直流送電々流を制御する
直流送電装置を２組備え、両送電装置の中性線を
共通にしてバイポーラ運転するものにおいて、中
性線で地絡事故が発生したことを検出する手段
と、該手段に応じて上記２組の直流送電装置のう
ち一方の電流指令値を、他の電流指令値を中心に
増減する手段を備えたことを特徴とする直流送電
装置の制御装置。[Scope of Claims] 1. In a device that is equipped with two sets of DC power transmission devices that control the DC power transmission current according to a current command value, and performs bipolar operation with the neutral wire of both power transmission devices in common, the neutral wire is connected to the ground. A control device for a DC power transmission device, comprising means for detecting the occurrence of a line fault, and means for alternately reducing the current command values of the two sets of DC power transmission devices in accordance with the means. . 2. A ground fault occurred in the neutral line of a system equipped with two sets of DC power transmission equipment that controls the DC power transmission current according to the current command value, and that operates bipolarly with the neutral wires of both power transmission equipment in common. and a means for increasing or decreasing the current command value of one of the two sets of DC power transmission devices based on the current command value of the other DC power transmission device. Control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1427079A JPS55109131A (en) | 1979-02-13 | 1979-02-13 | Cotnroller for dc transmission apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1427079A JPS55109131A (en) | 1979-02-13 | 1979-02-13 | Cotnroller for dc transmission apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55109131A JPS55109131A (en) | 1980-08-22 |
| JPS6311855B2 true JPS6311855B2 (en) | 1988-03-16 |
Family
ID=11856390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1427079A Granted JPS55109131A (en) | 1979-02-13 | 1979-02-13 | Cotnroller for dc transmission apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55109131A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3416256B1 (en) * | 2017-06-13 | 2020-12-30 | General Electric Technology GmbH | High voltage direct current converter harmonic filtering and protection system |
-
1979
- 1979-02-13 JP JP1427079A patent/JPS55109131A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55109131A (en) | 1980-08-22 |
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