JPS5875478A - Stopping system of ac-dc converter - Google Patents
Stopping system of ac-dc converterInfo
- Publication number
- JPS5875478A JPS5875478A JP56173773A JP17377381A JPS5875478A JP S5875478 A JPS5875478 A JP S5875478A JP 56173773 A JP56173773 A JP 56173773A JP 17377381 A JP17377381 A JP 17377381A JP S5875478 A JPS5875478 A JP S5875478A
- Authority
- JP
- Japan
- Prior art keywords
- converter
- power
- control
- turned
- overvoltage
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/66—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal
- H02M7/68—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters
- H02M7/72—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/75—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/757—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/7575—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only for high voltage direct transmission link
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Direct Current Feeding And Distribution (AREA)
- Rectifiers (AREA)
- Inverter Devices (AREA)
Abstract
Description
【発明の詳細な説明】
（、） 技術分野の説明
本発明は、弱い交流系統に接続された周波数質−装置や
直流送電設備のような直流連系ンステムにおいて、伺ら
かの事故により、交直変換装置を事故停止させるとき、
停止時に交流系統に過電圧を発生させるととなく、前記
交直変換装置を停止させる交直変換装置の停止方式に関
する。[Detailed Description of the Invention] (,) Description of the Technical Field The present invention relates to a DC interconnection system such as frequency quality equipment or DC power transmission equipment connected to a weak AC system. When stopping the converter in an accident,
The present invention relates to a method for stopping an AC/DC converter that stops the AC/DC converter without generating an overvoltage in the AC system when the AC/DC converter is stopped.
（ｂ） 従来技術の説明
第１図は、直流送電装置の概略構成図を示し、交流量１
ｔｊ Ｊ 、 １’は変換用変圧器２，２′を介して、
例えば、多数個のサイリスタの直並列接続から成る変換
器３．３′に接続され、各サイリスタの点弧位相を制御
することにより交流を直流に又は直流を交流に変換する
。４．４′は平滑りアクトルト、５は直流送電線路、６
．６′は計器用変圧器（Ｐ、Ｔ）、７．７′は計器用交
流器（Ｃ，Ｔ）を示す。このような主回路構成における
制御装置としては、定電流制御回路（ＡＣＲ） ８ 、
８’及び定電圧制御回路（ＡＶＲ） ９ 、９’はそれ
ぞれ基準値ＴｄＰ 、 Ｅｄｐと検出値１ｄ 、 Ｅｄ
との偏差を制御電圧Ｅｃ Ｉ／Ｃ変換しこの制御電圧Ｅ
ｃは制御電圧選択回路１０．１０’に入力される。前記
制御電圧−択回路１０．１０’は各種制御のうちで制御
角を一番進める制御系を自動的に選択するものであシ、
ここで選択された制御電圧Ｅｃは、制御電圧リミクタ回
路１１゜１１′で上限、下限のリミッタをかけられ点弧
位相制御回路１１．ｘｘ’に入力される。前記点弧位相
制御回路１２ 、 ｙ ｚ’は制御電圧Ｅｃに比例し九
点弧位相を決定してサイリスタに点弧指令を出力する。(b) Description of prior art Figure 1 shows a schematic configuration diagram of a DC power transmission device.
tj J, 1' is via conversion transformers 2, 2',
For example, it is connected to a converter 3.3' consisting of a number of thyristors connected in series and parallel, and converts alternating current into direct current or vice versa by controlling the firing phase of each thyristor. 4.4' is a flat sliding actuator, 5 is a DC transmission line, 6 is
．． 6' indicates a potential transformer (P, T), and 7.7' indicates a potential alternator (C, T). As a control device in such a main circuit configuration, a constant current control circuit (ACR) 8,
8' and constant voltage control circuit (AVR) 9, 9' are reference values TdP, Edp and detection values 1d, Ed, respectively.
The deviation from the control voltage Ec is converted into I/C and this control voltage E
c is input to the control voltage selection circuit 10.10'. The control voltage selection circuit 10.10' automatically selects the control system that advances the control angle most among various types of control;
The control voltage Ec selected here is subjected to upper and lower limit limits in the control voltage limiter circuit 11. xx' is input. The firing phase control circuit 12, yz' determines nine firing phases in proportion to the control voltage Ec, and outputs a firing command to the thyristor.
このようＫして構成され九交直変換装置では、周知のご
とく、電流マージン（ΔＩ）の切替によシ一方が順変換
装置として定電流制御により運転され、他方が逆変換装
置として定電圧制御によシ運転される。１３〜１６はし
ゃ断器、１７．１１１は、進相の無効電力を供給する電
力用コンデンサー（以下、ｓｃと略す。）、１９．２０
は、高調波を吸収する為の交流フィルター（以下、ＡＣ
Ｆと略す。）である。As is well known, in the nine AC/DC converters configured in this manner, one is operated as a forward converter under constant current control and the other is operated as an inverse converter under constant voltage control by switching the current margin (ΔI). Being driven well. 13 to 16 are circuit breakers, 17.111 is a power capacitor (hereinafter abbreviated as SC) that supplies phase-advanced reactive power, 19.20
is an AC filter (hereinafter referred to as AC) for absorbing harmonics.
Abbreviated as F. ).
さて、第１図において、いま変換装置３を順変換装置と
して運転し、変換装置４を逆変換装置として運転してい
るとき、交流系統１′側の交流線路で地絡或は短絡のよ
うな事故が発生したとする。このような場合の従来の交
直変換装置の停止方式としては、逆変換装置３′を瞬時
にダートブロック（以下、ＣＢと略す。）又は、瞬時に
パイ・ぐスイア（以下、ＢＰＰと略す。）に投入すると
同時に、その情報を順変換装置３へ伝送し、順変換装置
３では、その情報を受信すると、瞬時にダートシフト（
以下、ＧＳと略す。）して、直流電流をすみやかに零に
して、しかる後ＧＢすると云う方式が採用さ八ていた。Now, in FIG. 1, when the converter 3 is operated as a forward converter and the converter 4 is operated as an inverse converter, if there is a ground fault or short circuit on the AC line on the AC system 1' side, Suppose an accident occurs. In such a case, the conventional method for stopping the AC/DC converter is to instantly turn the inverse converter 3' into a dirt block (hereinafter abbreviated as CB) or an instantaneous pi-gusuia (hereinafter abbreviated as BPP). At the same time, the information is transmitted to the forward conversion device 3, and upon receiving the information, the forward conversion device 3 instantly performs a dirt shift (
Hereinafter, it will be abbreviated as GS. ), the DC current was immediately reduced to zero, and then the GB was applied.
しかしながら、もし、交流系統Ｉか弱い系統例えば、強
い交流系統から大きなインピーダンスをもった線路を介
して接続されているような場合には、前記従来の停止方
式では玉停止時に交流系統に過電圧が発生し、その結果
アレスタの破壊や変換所機器の絶縁破壊を引き起すこと
になる。However, if a weak AC system is connected to a strong AC system through a line with large impedance, the conventional stopping method may cause an overvoltage to occur in the AC system when the ball stops. As a result, the arrester will be destroyed and the converter equipment will suffer dielectric breakdown.
との原因は、変換装置が送電中には、その送電電力値に
対応した遅相の無効電力を消費しているが、変換装置の
急速停止に伴ない進相の無効電力が過剰となり、即ち、
無効電力の大幅な変動が生じ、弱い交流系統でちると、
前記大幅な無効電力の変動が交流系統の大幅な電圧変動
を引き起すからである。又、どのとき前記交流系統の電
圧変動が過電圧傾向になることは周知である。前記の例
では、交流線路での事故を想定したが、他の事故、例え
ば、直流送電線路５の地絡事故などを想定しても同様で
ある。即ち、直流送電線路５に地絡事故が発生すると、
従来の停止方式で社、その地絡事故を検出すると順変換
装置３、逆変換装置３′をＧＳして、しかる後ＧＢする
方式が採用されている為に、前記問題点は全く解決され
ない、５
以上説明したごとく、何らかの事故が発生したときの従
来の変換装置の事故停止方式は、変換装置が弱い交流系
統に接続されるようなシステムでは、交流系統に過電圧
を発生させ、拡大事故を招くと云う大きな欠点があった
。The reason for this is that while the converter is transmitting power, it consumes lagging reactive power corresponding to the transmitted power value, but as the converter rapidly stops, the leading phase reactive power becomes excessive. ,
Significant fluctuations in reactive power occur, and when a weak AC system is used,
This is because the large fluctuations in reactive power cause large voltage fluctuations in the AC system. Furthermore, it is well known that when the voltage fluctuation of the AC system tends to be overvoltage. In the above example, an accident on an AC line is assumed, but the same holds true even if other accidents, such as a ground fault on the DC transmission line 5, are assumed. That is, when a ground fault occurs on the DC transmission line 5,
In the conventional stopping method, when a ground fault is detected, the forward converter 3 and the inverse converter 3' are GS and then GB, so the above problem is not solved at all. 5. As explained above, the conventional accident shutdown method for converters when some type of accident occurs generates overvoltage in the AC system in systems where the converter is connected to a weak AC system, leading to an expanded accident. There was a big drawback.
（ｃ） 本発明の目的
従って、本発明の目的は、このような欠点を除去する為
になされたものであって、特に変換装置が弱い交流系統
に接続されているシステムでの交流線路事故時に交流系
統に過電圧を発生することなく前記変換装置をすみやか
に停止させる為の新しい交直変換装置の停止方式を提供
することにある。(c) Purpose of the Invention Accordingly, the purpose of the present invention is to eliminate such drawbacks, especially in the event of an AC line accident in a system where the converter is connected to a weak AC system. It is an object of the present invention to provide a new method for stopping an AC/DC converter for quickly stopping the converter without generating an overvoltage in an AC system.
（ｄ） 発明の構成
第２図は、本発明の一実施例を示す制御回路図、第３図
は、第２図の動作説明の為のタイムチャートであり、第
２図において、第１図と同一要素は同一符号で示しであ
る。(d) Structure of the Invention FIG. 2 is a control circuit diagram showing one embodiment of the present invention, and FIG. 3 is a time chart for explaining the operation of FIG. 2. The same elements are indicated by the same reference numerals.
さて、第２図において、２ノは所望の制御遅れ角に相当
する制御電圧設定器で、２２．２３はスイッチで、運転
中はスイッチ２２はオン、スイッチ２３はオフであり、
変換装置を事故停止させるときには、スイッチ２２がオ
フ、スイッチ２３がオンとなる。又、２４は直流過電流
を検出する為のレベル検出器であり、２５．２６はアン
ド素子である。Now, in FIG. 2, 2 is a control voltage setter corresponding to the desired control delay angle, 22 and 23 are switches, and during operation, switch 22 is on and switch 23 is off.
When the conversion device is brought to an accidental stop, the switch 22 is turned off and the switch 23 is turned on. Further, 24 is a level detector for detecting DC overcurrent, and 25 and 26 are AND elements.
（、） 発明の作用
さて、前記左開じく、変換装置３を順変換装置とし、変
換装置４を逆変換装置として、交流系統１′側の交流線
路で地絡或いは短絡事故が発生したとすると、この事故
を、例えば交流不足電圧継電器で検出して、この事故検
出信号によシ、逆変換装置３′をＢＰＰ Ｋ入れる。一
方、前記事故検出信号は、伝送系を介して、順変換装置
ｓ側へ伝送される。このとき、逆変換装置３′がＢＰＰ
になると、直流短絡と同じ現象であるから、直流電流は
急速に増加する。即ち、第２図において、レベル検出器
２４が動作して、ロジックレベル″′１”となシ、従っ
て、アンド素子２５の出力信号も又ロジックレベル“１
″ となる。(,) Function of the Invention Now, as mentioned above, if the converter 3 is a forward converter and the converter 4 is an inverse converter, if a ground fault or short circuit accident occurs in the AC line on the AC system 1' side, Then, this fault is detected by, for example, an AC undervoltage relay, and the inverter 3' is turned on to BPP K based on this fault detection signal. On the other hand, the accident detection signal is transmitted to the forward conversion device s via the transmission system. At this time, the inverse conversion device 3' converts the BPP
When this happens, the DC current increases rapidly, as this is the same phenomenon as a DC short circuit. That is, in FIG. 2, the level detector 24 operates and the logic level is "'1", so the output signal of the AND element 25 also becomes the logic level "1".
”.
このアンド素子２５の出力信号が、ロジックレベル°′
１”となると、この信号に連動してスイッチ２２はオフ
、スイッチ２３はオンとなって順変換装置３社、成る固
定の制御遅れ角で運転され−ることになる。この運転状
態は、逆変換装置３′がＢＰＰ状態であるので、謂ゆる
主力率運転状態であり、順変換装置が最も遅相の無効電
力を消費する運転形態であり、このとき交流系統１の電
圧が低下する。従って、このような状態で、即−ち、ア
ンド素子２５の出力信号が、ロジックレベル″１”とな
った時点で、ＳＣ１７やｋｃＦ１９のしゃ断指令を発生
して、し中断し、その後５Ｃ１７やＡＣＦ １９がしゃ
断された条件をもとに、即ちアンド素子２６の出力信号
がロジックレベル″１″になったとき、順変換装置３を
ＧＳＬ、ＧＢすれば、進相の無効電力が過剰になること
はないので、交流系統に過電圧が発生することはない。The output signal of this AND element 25 is at logic level °'
1'', the switch 22 is turned off and the switch 23 is turned on in conjunction with this signal, and the three forward converters are operated at a fixed control delay angle. Since the converter 3' is in the BPP state, it is in a so-called main power factor operating state, and the forward converter is an operating mode in which it consumes the slowest phase reactive power, and at this time, the voltage of the AC system 1 decreases. In such a state, that is, when the output signal of the AND element 25 becomes logic level "1", a cutoff command is generated for the SC17 and the kcF19, and then the 5C17 and the ACF 19 are interrupted. If the forward converter 3 is set to GSL and GB based on the condition that the output signal is cut off, that is, when the output signal of the AND element 26 becomes logic level "1", the phase-advanced reactive power will not become excessive. Therefore, no overvoltage will occur in the AC system.
尚、第３図のタイムチャートにおいて、ｔ。In addition, in the time chart of FIG. 3, t.
の時点は、逆変換−装置３′がＢＰＰに投入された時点
、１．の時点は、逆変換装置３′側で検出された事故検
出信号が、順変換装置３′で受信された時点、１２はナ
ンド素子２５の出力信号がロジックレベル”′１”とな
った時点、ｔ３はアンド素子２６ｆ）出力信号がロジッ
クレベル“１″ となった時点、即ちＢＣｌ２やＡＣＦ
１９がしゃ断されて、順変換装置３がＧＳ操作に入っ
た時点・ｔ４は順変換装置３がＧＢされた時点を示す。The point in time is 1. when the inverse transformation device 3' is introduced into the BPP. The time point 12 is the time point when the accident detection signal detected on the inverse conversion device 3' side is received by the forward conversion device 3', and the time point 12 is the time point when the output signal of the NAND element 25 becomes logic level "'1". t3 is the point at which the AND element 26f) output signal becomes logic level "1", that is, when BCl2 or ACF
19 is cut off and the forward conversion device 3 enters the GS operation, t4 indicates the time point when the forward conversion device 3 is GB-operated.
（ｆ）変形例
前記の実施例では、順変換装置３が所望の固定された制
御遅れ角で運転継続されるような例であるが１、所定の
範囲内の制御遅れ角でのみ運転が許容されゐように、例
えば、第１図における制御電圧リオ、り回路１ノを所定
の速度でし＃′！Ｌ′シ込む方式も考えられる。(f) Modification In the above embodiment, the forward conversion device 3 continues to operate at a desired fixed control delay angle, but 1, operation is allowed only at a control delay angle within a predetermined range. As shown in FIG. 1, for example, if the control voltage in FIG. A method in which L' is pushed in is also conceivable.
又、以上の説明では、変換装置３を順変換装置とし、変
換装置３′を逆変換装置として、逆変換装置３′側の事
故を想定したが、逆に、変換装置３を逆変換装置とし、
変換装置３′を順変換装置として、順変換装置３′側の
事故を想定して屯同じ効果が得られる。即ち、第２図の
実施例では、制御電圧設定器２１は、もともと順変換装
置として運転されるように設定されているからであり、
又第２図の実施例を用いない場合でも、制御遅れ角が順
変換装置としての運転領域迄移行できるようにしておけ
ば良いからである。例えば、第１図の制御電圧リミッタ
回路１１の上限リミッタが電気角で１６０°、下限リミ
ッタが電気角で８０’になるように制御電圧リミ、り回
路１１を構成すればよい。In addition, in the above explanation, the converter 3 is a forward converter, the converter 3' is an inverse converter, and an accident on the inverse converter 3' side is assumed, but conversely, the converter 3 is assumed to be an inverse converter. ,
By using the converting device 3' as a forward converting device, the same effect can be obtained assuming an accident on the forward converting device 3' side. That is, in the embodiment shown in FIG. 2, the control voltage setter 21 is originally set to operate as a forward conversion device.
Furthermore, even if the embodiment shown in FIG. 2 is not used, it is sufficient to allow the control delay angle to shift to the operating range of the forward conversion device. For example, the control voltage limiter circuit 11 shown in FIG. 1 may be configured so that the upper limiter is 160 degrees in electrical angle and the lower limiter is 80' in electrical angle.
（ｇ） 総合的な効果
以上説明したごとく、本発明によれば、弱い交流系に接
続されだ交直変換装置の一端で伺らかの事故が発生した
とき、事故端の変換装置をＢＰＰに入れ、主力率運転を
行ない、しかる後ＳＣやＡＣＦをし中断して、すみやか
に変換装置を停止させることによシ、事故停止時におけ
る交流系統の過電圧を抑制し、ひいてはアレスタの破壊
や変換所機器の絶縁破壊などと云う拡大事故を防止する
ことができると云う著しい効果を有する。(g) Overall effect As explained above, according to the present invention, when an accident occurs at one end of an AC/DC converter connected to a weak AC system, the converter at the accident end can be put into BPP. By performing main power factor operation, then interrupting the SC or ACF, and promptly stopping the converter, overvoltage in the AC system at the time of an accidental shutdown can be suppressed, and this can lead to damage to the arrester and converter station equipment. This has the remarkable effect of preventing further accidents such as dielectric breakdown.
第１図は直流発電装置の概略構成図、第２図は本発明の
一実施例を示す制御回路図、第３図はそのタイムチャー
トを示す図である。
１，１′・・・交流系統、２．２’・・・変換用変圧器
、３．３′・・・変換装置、４，４′・・・平滑りアク
ドル、５・・・直流送電線路、６．６′・・・計器用変
圧器、７．１′・・・計器用変流器、’８．８’・・・
定電流制御回路、９．９′・・・定電圧制御回路、１ｏ
、１ｏ’・・・最小値選択回路、１ｌａｌｉ’・・・制
御電圧ＩＪ ミッタ回路、Ｊ ２ 、 Ｊ ｊ’・・・
点弧位相制御回路、１３〜１６ ・・・し中断器、１７
１．１８・・・電力用コンデンサー、１９．２ｏ・・・
交流フジイルター、２１・・パ制御電圧 凹設定器、
２２．２３・・・スイッチ。 １糎
出願人代理人 弁理士 鈴 江 武 彦１ ′FIG. 1 is a schematic configuration diagram of a DC power generator, FIG. 2 is a control circuit diagram showing an embodiment of the present invention, and FIG. 3 is a diagram showing a time chart thereof. 1, 1'... AC system, 2.2'... Conversion transformer, 3.3'... Conversion device, 4, 4'... Smooth sliding axle, 5... DC transmission line , 6.6'...Instrument transformer, 7.1'...Instrument current transformer, '8.8'...
Constant current control circuit, 9.9'...constant voltage control circuit, 1o
, 1o'... Minimum value selection circuit, 1lali'... Control voltage IJ mitter circuit, J 2 , J j'...
Ignition phase control circuit, 13-16 ... interrupter, 17
1.18...Power capacitor, 19.2o...
AC Fuji Filter, 21...Pa control voltage concave setting device,
22.23...Switch. 1.Applicant's agent Patent attorney Takehiko Suzue 1'
Claims (2)
置において、前記交直変換装置を停止する際一端子を／
４イ・譬ス（アに入れて、他の端子を所望の制御遅れ角
で運転して、交流フィルターや電力用コンデンサーをし
中断した後に、前記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交直変換装置の停止方式。(1) In an AC/DC converter that converts alternating current to direct current and direct current to alternating current, when the AC/DC converter is stopped, one terminal is
4 B. Parable (A), the other terminals are operated at a desired control delay angle, and the AC/DC converter is stopped after the AC filter and power capacitor are interrupted. A stopping method for AC/DC converters.
置において、前記交直変換装置を停止する際一端子をパ
イツタスペアに入れて、他の端子の制御遅れ角に所望の
範囲のリミ、りを施して運転し、交流フィルターや、電
力用コンデンサーをし中断した後に、前記交直変換装置
を停止させるようにしたことを特徴とする交直変換装置
の停止方式。(2) In an AC/DC converter that converts AC to DC (1) to AC, when stopping the AC/DC converter, one terminal is placed in a piston spare, and the control delay angle of the other terminal is set to a desired range. 1. A method for stopping an AC/DC converter, characterized in that the AC/DC converter is stopped after the AC filter and the power capacitor are turned on and the AC/DC converter is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56173773A JPS5875478A (en) | 1981-10-30 | 1981-10-30 | Stopping system of ac-dc converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56173773A JPS5875478A (en) | 1981-10-30 | 1981-10-30 | Stopping system of ac-dc converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5875478A true JPS5875478A (en) | 1983-05-07 |
| JPH0130370B2 JPH0130370B2 (en) | 1989-06-19 |
Family
ID=15966872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56173773A Granted JPS5875478A (en) | 1981-10-30 | 1981-10-30 | Stopping system of ac-dc converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5875478A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05140814A (en) * | 1991-11-18 | 1993-06-08 | Toray Ind Inc | Melt spinning method |
-
1981
- 1981-10-30 JP JP56173773A patent/JPS5875478A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0130370B2 (en) | 1989-06-19 |
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