JPS5851727A - Disconnection detector for dc transmission line - Google Patents

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】 本発明は直流送電線の保謙装置、特に直流送電線の断線
検出装置に胸する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a DC power line protection device, and particularly to a DC power line disconnection detection device.

ｌＬ抛送亀においては、直流送電線の断線事故時には送
電が不能となるため、断線を検出して保護する心嚢があ
る。In the case of a disconnection accident in the DC transmission line, power transmission becomes impossible in the 1L tortoise, so there is a pericardial sac that detects the disconnection and protects it.

従来の断線検出装置としては、特開ｉＩ８６１−１ｇ１
１ｈ４　号のように断線故障時に生ずる直流送電線の一
端の電圧差によって検出するものがあった。第１因は直
流送電系統図で、（１）は交流系統、儲）は変圧器、（
１）は順変換器、鵠）は直流送電線、（Ｓ）は逆変＃！
ｋＩＩである。上記従来の装置は、断線事故時に順変換
１１（８）のｒＩｉ流電圧電圧昇し、逆変換器（旬の直
流電圧カシ低下することに着目し１両変換器の直流電圧
差によって断線を検出するものである。すなわち　＊変
換ＩＩ　（１）の直流電圧を”Ｓｓ逆変換器（ｉ）の直
流電圧を−とすると。As a conventional disconnection detection device, Japanese Patent Application Laid-Open No. iI861-1g1
There were some, such as No. 1h4, that detected by the voltage difference at one end of a DC transmission line that occurred when a disconnection occurred. The first factor is the DC transmission system diagram, where (1) is the AC system, (1) is the transformer, (
1) is a forward converter, Mouse) is a DC transmission line, and (S) is an inverse converter #!
It is kII. The conventional device described above focuses on the fact that when a wire breakage occurs, the rIi current voltage of the forward converter 11 (8) increases, and the DC voltage of the reverse converter (current) decreases, and detects a wire breakage based on the DC voltage difference between one converter. That is, *If the DC voltage of Conversion II (1) is "-", the DC voltage of Ss inverter (i) is -.

１１１−ＩＩｌ≧Ｋ　　　Ｋｓｉａ定値ある・ しかしながら、上記胸係が成立するのは断線故障の時だ
けに限らｎない。例えば、逆変換！Ｉ　（１１，）が転
流失敗した場合には、転流失敗した相は直流短絡状紐と
なるため、その電圧Ｅ１はほとんど零になるので上紀胸
係が成立する。また、過電圧から体験するために、変換
器にバイパスペア指令を与えて直流鉤を短絡させる操作
が行なわれることがある。この場合にもバイパスペア吠
皺の変換器の電圧は零となるので上記胸係が成立し、断
線でないのに断線であると判断されるξとになる。111-IIl≧K Ksia has a fixed value. However, the above relationship is not limited to only when there is a disconnection fault. For example, inverse transformation! When commutation of I (11,) fails, the phase in which commutation has failed becomes a DC short-circuit string, and the voltage E1 becomes almost zero, so that the Joki chest relation is established. Furthermore, in order to experience overvoltage, an operation may be performed to short-circuit the DC hook by giving a bypass pair command to the converter. In this case as well, the voltage of the converter of the bypass pair becomes zero, so the above-mentioned relationship holds true, and the line becomes ξ, which is determined to be a disconnection even though it is not a disconnection.

このように、従来の直流送電線の断線検出装置は、断線
でないのに新味であると判断してしまうｌｉｂ趣点があ
った。As described above, the conventional disconnection detection device for a DC power transmission line has the disadvantage of determining that the disconnection is new even though it is not a disconnection.

ヒの発明は、［流送電線の断線時に発止する両端の直流
電圧差だけでなく、順変換器の直流電圧が正、逆変換器
の直流電圧が負である仁とを条件に追加して、正−に断
線を検出するものである。In addition to the DC voltage difference between both ends that occurs when a power transmission line is disconnected, the invention of H adds the condition that the DC voltage of the forward converter is positive and the DC voltage of the reverse converter is negative. This means that a disconnection can be detected correctly.

第２図は、順変換器、逆変換器の代表的な電圧電流特性
である＠　Ｌｌ　ｅ　Ｌｌはそｎぞれ順変換器、逆変換
器分電圧電流特性である。順変換器は設定電流１１で定
に流１１−をしている。逆変換器は定余裕角ｌ１ｌＩ１
１シている。交点ｒは乙のようにＩＩ制御されたここで
直流送電線に断線が生ずると、ｌｊ度換器では動作点が
１点から特性Ｌ１に沿って移動して無負荷直流電圧の点
８に至る。同様にしぞ逆変換器では１点から特性Ｌ１に
沿って移動し、動作点は逆変換器のβが最大の点Ｔに至
る。従って、顧涙換しの直流電圧を鳩、逆変換器の直流
電圧をＥ２とすると、断ＩｓＩ！故時には両度換器の直
流賦圧の差の絶対値Ｉ　Ｅｓ　−ｈａ　Ｉ　　は所定値
に以上となり、且つＥ、＞Ｏ、Ｅ、＜０　　となる、こ
の発明はこのような直流電圧特性に基づき直流送電線の
断線を検出する装置を提案するものである。FIG. 2 shows typical voltage-current characteristics of a forward converter and an inverse converter. The forward converter has a constant current 11- at a set current 11. The inverse converter has constant margin angle l1lI1
There are 1 shi. The intersection r is II-controlled as in B. If a disconnection occurs in the DC transmission line here, the operating point of the lj degree converter moves from point 1 along the characteristic L1 and reaches point 8 of the no-load DC voltage. . Similarly, the groove inverter moves from one point along the characteristic L1, and the operating point reaches the point T where β of the inverter is maximum. Therefore, if the DC voltage of the converter is E2, and the DC voltage of the inverter is E2, then IsI! In the past, the absolute value I Es −ha I of the difference in the DC voltage application of the double-degree converter is greater than a predetermined value, and E, > O, E, < 0. This invention applies to such DC voltage characteristics. This paper proposes a device for detecting disconnections in DC transmission lines based on the above.

第８１はこの発明に係る直流送電線の断線装置の一実ｊ
Ｉｉ例を示す回路構成図である。第８図において、１ｉ
１１．−は直流電圧検出器、（７）は直流電圧検出器−
の検出値を他端へ伝送する伝送装置、（８）は差に４Ｉ
Ｊ回路、−υ、−は極性判別回路、αＱはＡＮＤ団路、
（ロ）はタイマ回路であ各。No. 81 is an example of a DC power line disconnection device according to the present invention.
FIG. 3 is a circuit configuration diagram showing an example Ii. In Figure 8, 1i
11. - is a DC voltage detector, (7) is a DC voltage detector -
A transmission device that transmits the detected value of
J circuit, -υ, - is a polarity discrimination circuit, αQ is an AND circuit,
(b) is a timer circuit.

６ｍ送電ＩＩ　（４Ｊに断線事故が庄すると、直流電圧
検出Ｓ−の検出電圧値は上昇し、＠流亀圧検出器−の検
出１圧値番、ｉ低下する。これら電圧検出値は差動−結
（８）に入力、されて検出値開の！！ＩＬ−１ｍｌが設
定値に以上であるか否かが判別される＠　Ｉ”！−”ｍ
ｌ′≧にであれシ、差動回１ｈ　（８）は出力する。送
電端で検出された直流亀氏錬は檎゛性判別回路−１−に
て正極性か負−性か判別される゛。正極性である（とＩ
性判別−路声、＠は出力する。インにビット回路曽は、
差ＩＩＩ囲＃ｈ偵）、極性判別回路−が出力し、且−が
無出力のとき、換言すれば・ １１ｓ−都≧にでΣ、が正、Ｅ、が負の□と一出力する
。When a disconnection accident occurs in the 6m power transmission II (4J), the detected voltage value of the DC voltage detector S- increases, and the detected voltage value of the @current tortoise pressure detector-1 decreases. - It is input to conclusion (8) and it is determined whether the detected value open!!IL-1ml is greater than or equal to the set value @I"!-"m
Even if l'≧, the differential circuit 1h (8) outputs. The DC voltage detected at the power transmission end is determined by the polarity determining circuit-1 to be of positive polarity or negative polarity. positive polarity (and I
Gender determination - road voice, @ is output. In the bit circuit so,
In other words, when the polarity discrimination circuit outputs an output and - does not output, in other words, when 11s-T≧, Σ is positive and E is negative □.

インヒビットｌ　％　Ｍの出力が一定時間継続するとタ
イマ回路四が出力し、これによって直流送電線４、〜伽
の細単な起明 第１１１５Ｊはム流送亀系統因、第ｇ図は１直流送亀の
変振器の一圧電流特性凶“、ｆｉ＆１は乙の発明に係る
血流送ｌｌＩＣ４ＩのｌｌｒＩＩＭ検出装亀の一実施例
を示す回路図である。When the output of inhibit l % M continues for a certain period of time, the timer circuit 4 outputs an output, and this causes the DC transmission line 4 to be connected. 1 is a circuit diagram showing an embodiment of the llrIIM detection device of the blood flow sending IC4I according to the invention of Otsu.

内において、（３）は＠嶽ｉ器、（４）は直流ｍ電線。(3) is a @dake i-wire, and (4) is a dc m-wire.

（ｉ）　ｉ！逆変換器、−１−は直流電圧検出−１（２
）は差動回路、ａｎ　’、−は極性判別回路、帽よイと
ヒビ′ノド回路である。(i) i! Inverter, -1- is DC voltage detection -1 (2
) is a differential circuit, an', - is a polarity discrimination circuit, and a cap and a crack circuit.

なお、各１中のｈ−符号は同−又は貌当部分を示す。Note that the h- symbol in each 1 indicates the same or similar part.

代理人　葛野信−Agent Shin Kuzuno

Claims (1)

【特許請求の範囲】[Claims] ａ＆送電線の一端に設けられた順変換器の直流電圧を検
出するＩＨｌの線流電圧検出＃ＩＪ七、上記直流送電線
の他端に般けらむた逆変換器の直流電圧を検出する第２
の直流電圧検出器と、これら両液換器の出力を受は両−
流電圧の差が所定値以上であるξとを検出する波動回路
と、上記＠１および＠２の直流電圧検出器に対応して設
けられ、対応する直流電圧検出器の検出電圧の極性を判
別する＃！１および第２の極性判別回路と、これら極性
判別回路および上紀差勘−路の出力を受け、上記順変換
器の直振亀圧が正極性、上記逆変換器の直流電圧が負極
性であり、上記差ｋｉ＋１ｌＷＩＩが出力したことをも
って上記直流送電線が断線したと判断せしめる回路とを
備えた直流送電線の断線検出装置。a & IHl line current voltage detection #IJ7 which detects the DC voltage of the forward converter installed at one end of the power transmission line, and No. 2
The DC voltage detector and the output of both liquid exchangers are connected to
A wave circuit that detects ξ where the difference in current voltage is equal to or greater than a predetermined value, and a wave circuit that is provided corresponding to the DC voltage detectors @1 and @2 above, and that determines the polarity of the detected voltage of the corresponding DC voltage detector. do#! In response to the outputs of the first and second polarity discriminating circuits, these polarity discriminating circuits, and the primary differential circuit, the direct vibration pressure of the forward converter is of positive polarity, and the direct current voltage of the inverse converter is of negative polarity. and a circuit for determining that the DC transmission line is disconnected when the difference ki+1lWII is output.