JPS6066625A - Protecting system of dc transmission system - Google Patents
Protecting system of dc transmission systemInfo
- Publication number
- JPS6066625A JPS6066625A JP58171146A JP17114683A JPS6066625A JP S6066625 A JPS6066625 A JP S6066625A JP 58171146 A JP58171146 A JP 58171146A JP 17114683 A JP17114683 A JP 17114683A JP S6066625 A JPS6066625 A JP S6066625A
- Authority
- JP
- Japan
- Prior art keywords
- transmission line
- switch
- current
- time
- power transmission
- 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
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は直流送電系統の保護方法に係夛、特に虚数の回
線から成る大容量の直流送電系統の保護複数の回線をも
つ直流送電の代表的な構成例として、第１図に双極２回
線直流送′４系統の回路図を示す。この系統で、送電線
を点検等のため停止する場合の手順を以下に記す。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a protection method for a DC power transmission system, and in particular to a method for protecting a DC power transmission system with a large capacity consisting of imaginary lines. As an example of the configuration, FIG. 1 shows a circuit diagram of a bipolar two-line DC transmission system. The procedure for shutting down transmission lines for inspection, etc. in this system is described below.
（１） 開閉器９〜１２を常時１閉“で運転する場合。(1) When operating the switches 9 to 12 with the switches 9 to 12 always closed.
たとえば送電ｍ２９を停止するには、直流開閉器１．２
を開放し、送電線２９を流れている直流電流を送電線３
１に転流する。For example, to stop power transmission m29, DC switch 1.2
is opened, and the DC current flowing through the power transmission line 29 is transferred to the power transmission line 3.
Commutates to 1.
■ 開閉器９〜１２を常時１間”で運転する場合。■ When switches 9 to 12 are always operated for 1 hour.
（１）送電線２９を停止するには、直流開閉器９゜１０
全投入し、直流開閉器１，２ｔ−開放する。(1) To stop the power transmission line 29, use a DC switch 9°10
Fully turn on the power and open DC switches 1 and 2t.
（１１） 変換器２１．２２を停止し、直６＋１．開閉
器１゜２を開放する。その後、直流開閉器９〜１１を投
入し、変換器２１ｔ−再起動する。(11) Stop converters 21 and 22, and switch to direct 6+1. Open switch 1゜2. Thereafter, the DC switches 9 to 11 are turned on and the converter 21t is restarted.
上記ＩＩ−（ｉｔ）は、直流開閉器１〜８が直流電流（
通電々流）を遮断する能力金もたない場合に採用される
゛方法で、送電線路を停止するために長時間送電を停止
しなければならず、系統運用上好ましくない。In II-(it) above, the DC switches 1 to 8 are connected to the DC current (
This is a method that is adopted when there is no capacity or money to interrupt the current (carrying current), and it is undesirable for system operation because it requires stopping power transmission for a long time in order to stop the power transmission line.
噛今 １−１；Ｉｆ ｎ （偽１）ト七 メメＭｆ３ζ
鉢のピ１４ し面幻塊直流開閉器によって送電線路を開
閉する方法で、送％、を停止することがなく、系統運用
上好ましい。Kamima 1-1; If n (false 1) To 7 meme Mf3ζ
This is a method of opening and closing the power transmission line using a phantom block DC switch, which is preferable for system operation because there is no need to stop the transmission.
しかし、これらの方法は以下に述べる欠点を有している
。However, these methods have the following drawbacks.
たとえば、直流送電線路２９で事故が発生すると、直流
送電線路２９を流れる電流は急激に増加した後、変換器
２１．２２の制御により、ただちに設定された電流にま
で低下する。この電流変化を第２図に示す。直流開閉器
１．２は、直流送電線路２９を流れる電流が一定値に低
下した時点Ｃ以後に遮断動作する。事故発生から時点Ｃ
まで数１０ｍ５のオーダである。For example, when a fault occurs on the DC transmission line 29, the current flowing through the DC transmission line 29 increases rapidly, and then immediately decreases to the set current under the control of the converters 21,22. This current change is shown in FIG. The DC switch 1.2 performs a breaking operation after the time C when the current flowing through the DC power transmission line 29 drops to a constant value. Time C from the accident occurrence
The distance is on the order of several tens of meters.
今、直流送電線路２９を停止するため、直流開閉器１，
２に開放指令を出した直後に直流送電線路２９に事故が
発生すると、直流送電線路２９を流れる電流は第３図に
示すように変化し、電流値が最大になった時点Ｂで直流
開閉器１，２が遮断動作を行う可能性が生じるっ
このため、
（ａ） 直流開閉器１．２が、予じめコンデンサに蓄え
た１荷をインダクタンスを介して放電し、この時発生す
る高周波振動電流を、遮断部を流れる直流電流に重畳さ
せ、電流零点を発生させて遮断する方式の場合は、遮断
不能を完全に防止することはできない。Now, in order to stop the DC transmission line 29, the DC switch 1,
If an accident occurs in the DC transmission line 29 immediately after issuing the open command at step 2, the current flowing through the DC transmission line 29 changes as shown in Figure 3, and at point B when the current value reaches the maximum, the DC switch is closed. (a) DC switch 1.2 discharges the load stored in the capacitor in advance through the inductance, and the high-frequency vibration generated at this time In the case of a system in which the current is superimposed on the DC current flowing through the interrupting part to generate a current zero point and interrupt the interrupt, failure to interrupt the interrupt cannot be completely prevented.
（ｂ） 直流開閉器１，２が、遮断部アークの負性抵抗
特性と、遮断部に並列接続したキャパシタンス及びイン
クダンスとにより、次第に振巾が増大する高周波振動電
流を発生させ、遮断部全光れる直流電流に重畳させて、
電流零点を発生させ遮断する方式の場合には、遮断可能
な電流を、事故時流れる電流の最大値に設定しておけば
、遮断不能を防止できる可能性はある。しかし直流開閉
器は、その遮断する電流のほぼ２乗に比例して製作が困
難になるため、このようなきわめてまれな事態に対応で
きるよう遮断性能を大きくすることは現実的ではない。(b) The DC switches 1 and 2 generate a high-frequency oscillating current whose amplitude gradually increases due to the negative resistance characteristic of the interrupting section arc and the capacitance and ink dance connected in parallel to the interrupting section, and the entire interrupting section is Superimposed on the shining DC current,
In the case of a method that generates a current zero point and interrupts the system, it is possible to prevent failure to interrupt by setting the current that can be interrupted to the maximum value of the current that would flow in the event of an accident. However, since the difficulty of manufacturing a DC switch is approximately proportional to the square of the current to be interrupted, it is not realistic to increase the interrupting performance to cope with such extremely rare situations.
本発明の目的は、直流開閉器の遮断近勝−ｉｎｍした直
流送電系の保護方法を提供するにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for protecting a DC power transmission system in which a DC switch is cut off in a short period of time.
本発明は送電線路休止のため直流開閉器を遮断動作中に
線路事故が発生するというきわめて稀頻度な現象では、
直流開閉器が遮断不能するため、多回線と接続している
母線の直流開閉器を開放してその影響範囲を極限するも
のである。The present invention can be applied to the extremely rare phenomenon that a line accident occurs while the DC switch is being cut off due to the power transmission line being suspended.
Since the DC switch is unable to shut off, the DC switch on the busbar connected to the multiple circuits is opened to limit the range of influence.
以下、本発明の実施例を図によって説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図で、直流開閉器１〜１２は常時６閉”で運転し、
直流送電線路２９を停止する場合を考える。In Figure 1, DC switches 1 to 12 are always operated with 6" closed,
Consider a case where the DC power transmission line 29 is stopped.
直流送電線路２９を停止するため、時点ｔ０で直流開閉
器１，２に開放指令を出す。直流開閉器１あるいは血流
開閉器２は、時点ｔ１で遮断動作を開始し、時点ｔ２で
遮断動作を完了する。In order to stop the DC power transmission line 29, an opening command is issued to the DC switches 1 and 2 at time t0. The DC switch 1 or the blood flow switch 2 starts the blocking operation at time t1 and completes the blocking operation at time t2.
時点ｔＤ１で地絡事故が検出されると、地絡事故は、時
間ｔｏだけ前の時点ｔ、ｌで発生しておシ、時点ｔ１で
の電流４２の大きさが、直流開閉器１゜２の直流遮断能
力よシ大きければ、直流開閉器１゜２は遮断不能をおこ
すことが考えられる。時点１、を、電流４２の大きさが
直流開閉器１，２の直流遮断ｎヒカと等しくなっている
点とすれば、それ以前に地絡事故が発生した場合は遮断
可能であシ、従って、時点ｔＤｌより以前に事故が検出
された場合は、直流開閉器１，２は遮断不能を発生しな
い。When a ground fault is detected at time tD1, the ground fault has occurred at time t, l before time to, and the magnitude of the current 42 at time t1 is 1°2 in the DC switch. If the DC breaking capacity is greater than the DC breaking capacity of the DC switch 1. If time point 1 is the point where the magnitude of the current 42 is equal to the DC cutoff n voltage of the DC switches 1 and 2, then if a ground fault occurs before that point, it would be possible to cut off the current. , if a fault is detected before time tDl, the DC switches 1, 2 will not fail.
同様に、時点ｔ２を、電流４２の大きさが直流開閉器１
．２の直流遮断能力と等しくなっている点とすれば、そ
れ以後に地絡事故が発生した場合は遮断可能であシ、従
って、時点ｔＤ２よシ以後に事故が検出された場合は、
直流開閉器１，２は遮断不能を発生しない。Similarly, at time t2, the magnitude of the current 42 changes to the DC switch 1.
．． If a ground fault occurs after that point, it will be possible to shut off the DC current, and therefore, if an accident is detected after time tD2,
DC switches 1 and 2 do not fail to shut off.
すなわち、時点１０．から時点ｔＤ２の間に地絡事故が
検出された場合には、直流開閉器１．２は遮断不能を起
こすことが予想されるので、ただちに直流開閉器９．１
１を開放し、交直変換器２１゜２２′を停止する。That is, at time 10. If a ground fault is detected between tD2 and tD2, it is expected that DC switch 1.2 will be unable to shut off, so DC switch 9.1 will be immediately
1 is opened and the AC/DC converters 21° and 22' are stopped.
この時の各機器の動作を第４図にフローチャートで示し
た。The operation of each device at this time is shown in a flowchart in FIG.
この保護動作によシ、直流開閉器１．２が遮断不能を起
こすことによって、健全な直流送電線路３１、およびＶ
換器２５，２６に与える影響を最少に限定できる。As a result of this protective operation, the DC switch 1.2 becomes unable to shut off, thereby preventing the DC power transmission line 31 from being damaged and V
The influence on the converters 25 and 26 can be minimized.
本発明によれば、多回線の大容量直流送電系統において
、点検等のため、直流開閉器を開放することにより直流
送電線路を停止する動作中に直流送電線路に事故が発生
した場合の影響を最小にできる。しかも、直流開閉器の
責務を上記稀頻度事故のため大きくする必要がない。According to the present invention, in a multi-circuit, large-capacity DC transmission system, the effects of an accident occurring on a DC transmission line during the operation of stopping the DC transmission line by opening a DC switch for inspection etc. can be reduced. Can be minimized. Moreover, there is no need to increase the responsibility of the DC switch due to the above-mentioned rare accidents.
第１図は双極２回線直流送電の系統構成を示す回路図、
第２図は直流線路事故時の線路電流の変化を表わす図、
第３図は地絡事故と直流開閉器動作の時間関係金示す図
、第４図は第３図の関係において各機器の動作を示す図
である。
１〜１２・・・直流開閉器、１３〜２０・・・直流リア
クトル、２１〜２８・・・交直変換器、２９〜３２・・
・直流送電線路、３３〜３４・・・中性線、３５〜４０
・・・母線、４１・・・直流開閉器の動作をモデル化し
た線、４２．４３・・・線路電流の大きさをモデル化し
た線、Ｐ・・・電流、ｔ・・・時間、Ａ・・・事故発生
、Ｂ・・・電流最大時点、Ｃ・・・電流が元の値になる
時点、ｔｏ・・・開放指令、ｔ＾Ｉ＋’Ａ２・・・事故
発生、ｔｏｌ、ｔｏ２・・・事故検出、ｔｌ・・・遮断
開始２、ｔｌ・・・遮断終了、ｔＤ・・・検出時間、ｔ
ｆ・・・事故のため線路電流が定常電流より大きくなっ
ている時間、ｔｋ・・・■」極時間、ｔｌ・・・アーク
時間、Ｄ・・・直流開閉器、Ｅ・・・変換器、薯／図
應
Ｉ
第２図
ＡＢ Ｃｔ
し−Figure 1 is a circuit diagram showing the system configuration of bipolar two-line DC power transmission.
Figure 2 shows the change in line current during a DC line fault.
FIG. 3 is a diagram showing the time relationship between a ground fault and DC switch operation, and FIG. 4 is a diagram showing the operation of each device in the relationship shown in FIG. 3. 1-12...DC switch, 13-20...DC reactor, 21-28...AC/DC converter, 29-32...
・DC transmission line, 33-34...neutral wire, 35-40
...Bus bar, 41...Line modeling the operation of a DC switch, 42.43...Line modeling the magnitude of line current, P...Current, t...Time, A ... Accident occurrence, B... Maximum current point, C... Time point when the current reaches its original value, to... Open command, t^I+'A2... Accident occurrence, tol, to2... - Accident detection, tl... Cutoff start 2, tl... Cutoff end, tD... detection time, t
f...Time during which the line current is higher than the steady current due to an accident, tk...■'' pole time, tl...arc time, D...DC switch, E...converter,薯/图應I 2nd AB Ct し-
Claims (1)
の目的で休止するため、該送電線に接続されている直流
開閉装置を開放して、該送電線を直０１シ送電系統から
切離す動作において、該送電線に地絡事故が発生し、該
地絡事故の発生時点が前記直流開閉装置の開放動作中で
あるとみなせる場合、該直流送電線路と他回線の直流送
電線路を接続する母線に設けられている直流開閉装置を
開放し、該直流送電線路に接続されている交直変換装置
を停止させるようにしたことを特徴とする直流送電系統
の保護方法。1. In order to suspend a power transmission line in a DC transmission system that has multiple circuits for purposes such as inspection, open the DC switchgear connected to the transmission line and disconnect the transmission line from the DC transmission system. In the disconnection operation, if a ground fault occurs in the power transmission line and the time of occurrence of the ground fault can be considered to be during the opening operation of the DC switchgear, the DC power transmission line and the DC transmission line of another line are connected. 1. A method for protecting a DC power transmission system, comprising: opening a DC switchgear provided on a busbar to stop an AC/DC converter connected to the DC transmission line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58171146A JPS6066625A (en) | 1983-09-19 | 1983-09-19 | Protecting system of dc transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58171146A JPS6066625A (en) | 1983-09-19 | 1983-09-19 | Protecting system of dc transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6066625A true JPS6066625A (en) | 1985-04-16 |
Family
ID=15917834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58171146A Pending JPS6066625A (en) | 1983-09-19 | 1983-09-19 | Protecting system of dc transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6066625A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020181651A1 (en) * | 2019-03-12 | 2020-09-17 | 南方电网科学研究院有限责任公司 | Compact real-time simulation system for direct current control and protection |
-
1983
- 1983-09-19 JP JP58171146A patent/JPS6066625A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020181651A1 (en) * | 2019-03-12 | 2020-09-17 | 南方电网科学研究院有限责任公司 | Compact real-time simulation system for direct current control and protection |
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