JPH0779532A - Method and unit for protecting ac/dc converter - Google Patents
Method and unit for protecting ac/dc converterInfo
- Publication number
- JPH0779532A JPH0779532A JP5225283A JP22528393A JPH0779532A JP H0779532 A JPH0779532 A JP H0779532A JP 5225283 A JP5225283 A JP 5225283A JP 22528393 A JP22528393 A JP 22528393A JP H0779532 A JPH0779532 A JP H0779532A
- Authority
- JP
- Japan
- Prior art keywords
- converter
- voltage
- protection
- undervoltage
- gate
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、複数の発電機からなる
発電所あるいは発電所を含む交流系統の相互間の交流電
力を交直変換器により直流電力に変換して電力融通して
いる状態で、上記交直変換器の交流側端の相互間に連系
遮断器を介して交流連系した状態、いわゆる交直並列運
転時の変換器保護方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a state in which AC power between a power plant composed of a plurality of generators or an AC system including the power plant is converted into DC power by an AC / DC converter and the power is exchanged. The present invention relates to a converter protection system in a state in which the AC side ends of the AC / DC converters are AC-connected via mutual connection breakers, that is, a so-called AC / DC parallel operation.
【０００２】[0002]
【従来の技術】電力需要の拡大に伴って電力会社間の電
力融通が広く行われる様になっているが、３社以上の広
域融通を交流送電系統で行う場合には、各電力会社間に
跨る交流送電の閉ループが形成され系統の潮流制御の問
題が発生する。2. Description of the Related Art As power demand expands, electric power is widely exchanged between electric power companies. A closed loop of alternating current transmission is formed, which causes the problem of power flow control in the system.
【０００３】そこで、かかる潮流制御の問題を解決した
電力融通として、近年著しい進歩を遂げている半導体技
術による高信頼度、高耐圧、大電流のサイリスタ素子を
応用した交直変換設備が脚光を浴びている。この交直変
換設備は短絡容量の増大、周波数などの制御の相互干渉
を生ずることなく交流系統間を連系、また、潮流の大き
さ、方向の自由な制御が瞬時に出来ることから、前述し
た潮流制御の問題を解決できる。Therefore, as power interchange that solves the problem of such power flow control, AC / DC conversion equipment applying a highly reliable, high breakdown voltage, and large current thyristor element, which has made remarkable progress in recent years, has been in the limelight. There is. This AC / DC converter is capable of connecting between AC systems without increasing the short-circuit capacity and interfering with each other in control of frequencies, etc., and it is possible to instantly control the magnitude and direction of the tidal current. Can solve control problems.
【０００４】[0004]
【発明が解決しようとする課題】３電力会社間で交流系
統の閉ループが形成される場合には、２電力会社間の連
系線に上記交直変換設備を設置することで潮流制御が可
能な電力融通が行える。しかし、本交直変換設備で連系
した２電力会社の内の１社と交流系統で連系している残
りの１電力会社間との交流連系統線が切り離された場合
は、上述の交直変換設備で連系した２電力会社の内の１
社は単独系統となる。この場合には上記の交直変換設備
に併設した交流連系連絡線により交流連系を行う必要が
ある。このような交直変換器（直流）と併設して交流連
絡線が設置されている設備では、交流電力を交直変換器
にて直流電力に変換して、電力融通している状態から、
交直変換設器と併設して設置した連系遮断器により交流
連系に移行する場合は、一時的に交直並列運転を行う過
程がある。When a closed loop of the AC system is formed between the three electric power companies, the above-mentioned AC / DC conversion equipment is installed on the interconnection line between the two electric power companies to control the power flow. Allows for flexibility. However, if the AC grid line between one of the two power companies connected by this AC / DC conversion equipment and the remaining one power company connected by the AC system is disconnected, the AC / DC conversion described above is performed. 1 of 2 power companies connected by equipment
The company becomes a single line. In this case, it is necessary to carry out AC interconnection by the AC interconnection communication line provided adjacent to the AC / DC converting equipment. In a facility in which an AC communication line is installed side by side with such an AC / DC converter (DC), AC power is converted to DC power by the AC / DC converter, and from the state of power interchange,
When switching to AC interconnection by the interconnection breaker installed in parallel with the AC / DC converter, there is a process of temporarily performing AC / DC parallel operation.
【０００５】このような一時的に交直並列運転を行う過
程においては、交直変換器のＲＥＣ側、ＩＮＶ側が交流
連系線を通じて同一交流系統につながっている。この場
合、交流系統で地絡故障が発生すると、交直変換器のＲ
ＥＣ側，ＩＮＶ側の交流電圧が同時に低下し、従来には
考慮していなかった故障モードが発生する。In the process of temporarily performing the AC / DC parallel operation, the REC side and the INV side of the AC / DC converter are connected to the same AC system through an AC interconnection line. In this case, if a ground fault occurs in the AC system, R of the AC / DC converter
The AC voltage on the EC side and the AC voltage on the INV side decrease at the same time, causing a failure mode that has not been considered in the past.
【０００６】本発明は上記事情に基づいてなされたもの
で、その目的とするところは、直流電力融通状態にて、
交直変換器に併設して設置された交流連系連絡線を併入
した交直並列運転時の交直変換器の保護方式を提供する
ことにある。The present invention has been made in view of the above circumstances, and its purpose is to provide a DC power interchange state.
An object of the present invention is to provide a protection method for an AC / DC converter during AC / DC parallel operation, which includes an AC interconnection line installed in parallel with the AC / DC converter.
【０００７】[0007]
【課題を解決するための手段】本発明の交直変換器の保
護装置は二つの交流電力系統を連系するものにおいて、
交流電力系統電圧が所定値より低下したとき不足電圧を
検出する電圧検出手段と、前記交直変換器に併設された
交流連系連絡線のしゃ断器の投入信号あるいは投入指令
信号を入力し切り換え信号を出力する切り換え手段と、
前記切り換え信号により順変換側あるいは逆変換側のい
ずれか一方の交直変換器を前記電圧検出手段が不足電圧
を検出した時ゲートブロックする保護連動操作手段とを
具備する。A protection device for an AC / DC converter according to the present invention is one in which two AC power systems are interconnected,
A voltage detection means for detecting an undervoltage when the AC power system voltage drops below a predetermined value, and a switching signal by inputting a closing signal or a closing command signal of the breaker of the AC interconnection communication line provided in the AC / DC converter. Switching means for outputting,
And a protection interlocking operation means for gate-blocking the AC / DC converter on either the forward conversion side or the reverse conversion side by the switching signal when the voltage detection means detects an undervoltage.
【０００８】[0008]
【作用】一つの交流電力系統と他の交流電力系統を交直
変換器を介して連系している状態で、この交直変換器に
併設された交流連系絡線のしゃ断器を投入し交直並列運
転する際、このしゃ断器の投入信号あるいは投入指令信
号に連動し、交流系統不足電圧時バイパスペアする前記
交直変換器の常時の保護連動操作の設定を、順変換側あ
るいは逆変換側のいずれか一方の交直変換器を交流電力
不足電圧時ゲートブロックする保護連動操作の設定に切
り換える。[Operation] With one AC power system and another AC power system interconnected via the AC / DC converter, the AC / DC converter circuit breaker attached to this AC / DC converter is turned on to connect the AC / DC parallel system. When operating, set the continuous protection or reverse conversion side setting of the continuous protection interlocking operation of the AC / DC converter that is linked with the closing signal or closing command signal of this breaker and bypass-pairs when the AC system is undervoltage. Switch one of the AC / DC converters to the protection interlocking operation setting that gate-blocks when the AC power is undervoltage.
【０００９】[0009]
【実施例】本発明による保護方式は、交流連系用遮断器
の投入指令により交直変換器の保護連動条件を選択する
保護回路を形成し、交直変換器の交流側端の電圧条件に
より最終の保護連動を行うよう保護回路を形成すること
により、上記目的を達成するようにしている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The protection system according to the present invention forms a protection circuit for selecting a protection interlocking condition of an AC / DC converter in response to a closing command of an AC interconnection circuit breaker, and a final protection circuit is selected according to a voltage condition at an AC side end of the AC / DC converter. The above-mentioned object is achieved by forming a protection circuit so as to perform protection interlocking.
【００１０】以下本発明の一実施例を図面を参照して説
明する。図１は複数の発電機と負荷を有する２つの交流
系統を、交流連系連絡線を有する交直変換器により連系
する交直連系設備の一例を示す図である。図１におい
て、各発電所Ｇ11，Ｇ12，…，Ｇ1nの交流電力は開閉所
ＳＳ１を経て、交流送電線ＡＬ１を介して交直変換連系
所ＩＣＳの変換所交流母線ＡＢ１に送電される。交直連
系変換所ＩＣＳでは、交流母線ＡＢ１から変換器用変圧
器ＣＴ１、交直変換器ＢＴＢ１、直流リアクトルＤＣ
Ｌ、交直変換器ＢＴＢ２、変換器用変圧器ＣＴ２で構成
される直流設備を介して交流電力→直流電力→交流電力
に変換され交流母線ＡＢ２から交流送電線ＡＬ２、開閉
所ＳＳ２を経て交流負荷Ｒ２へ電力供給している。ま
た、上記の流れとは、逆の電力融通もある。An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an example of an AC / DC interconnection facility in which two AC systems having a plurality of generators and loads are interconnected by an AC / DC converter having an AC interconnection communication line. In FIG. 1, the AC power of each power plant G11, G12, ..., G1n is transmitted to the conversion station AC bus AB1 of the AC / DC conversion interconnection station ICS via the switching station SS1 and the AC transmission line AL1. At the AC / DC interconnection converter ICS, from the AC bus AB1 to the converter transformer CT1, the AC / DC converter BTB1, and the DC reactor DC.
L, AC / DC converter BTB2, converter transformer CT2 is converted to AC power → DC power → AC power via a DC facility, and then AC bus AB2 is passed through AC transmission line AL2 and switch station SS2 to AC load R2. It is supplying power. Further, there is power interchange opposite to the above flow.
【００１１】図１において、ＣＢは交直変換設備に併設
された交流連系連絡線を投入、遮断する為の遮断器であ
り、ＰＴ１，ＰＴ２は交流母線ＡＢ１，ＡＢ２に設けた
変成器であり、各々検出信号ａ，ｂを出力する。In FIG. 1, CB is a circuit breaker for making and breaking an AC interconnection line provided in an AC / DC converter, and PT1 and PT2 are transformers provided on the AC buses AB1 and AB2. It outputs detection signals a and b, respectively.
【００１２】次に図２を参照して交直変換器による電力
融通から交流連系連絡線の遮断器を投入し交直並列運転
を行う場合の保護方式について説明する。通常、直流系
時には故障等により交流母線の電圧が低下すると電圧低
下した系統側をバイパスペア状態にする保護が行われて
いるが、交直並列運転時に故障が発生すると両端同時に
電圧の低下が起き従来の変換器保護ではＩＮＶ側、ＲＥ
Ｃ側が同時にバイパスペア状態になる可能性がある。ま
た、他励式変換器の場合、変換器から見た交流系統電圧
がどの程度あるかによって変換器の運転ができないこと
もある。仮に、系統電圧が0.3 ＰＵ以下になると転流が
出来ないこともある変換器では、ＲＥＣ端、ＩＮＶ端が
同時に転流できないことも有り得る。図２では、上述の
ような状態に対応するための保護方式のブロック図を示
している。Next, with reference to FIG. 2, a protection method in the case of performing AC / DC parallel operation by turning on the breaker of the AC interconnection communication line from the power interchange by the AC / DC converter will be described. Normally, in the case of a DC system, if the voltage of the AC bus drops due to a failure, etc., the system side, where the voltage has dropped, is protected by a bypass pair state.However, if a failure occurs during AC / DC parallel operation, the voltage drops at both ends simultaneously. In the converter protection of INV side, RE
The C side may be in the bypass pair state at the same time. Further, in the case of the separately excited converter, the converter may not be able to operate depending on how much the AC system voltage seen from the converter is. If the converter may not be commutated when the system voltage is 0.3 PU or less, the REC end and the INV end may not be commutated at the same time. FIG. 2 shows a block diagram of a protection method for dealing with the above-mentioned state.
【００１３】図２において、Ｖref １…Ｖref ４は、図
１において交流母線ＡＢ１，ＡＢ２に設けられた変成器
ＰＴ１，ＰＴ２からの信号ａ，ｂに基づいて働く交流不
足電圧リレーを示す。また、Ｓ１は図１の遮断器ＣＢの
投入指令によって動作する切り換え機構を示す。例え
ば、Ｖref １とＶref ３を0.6 ｐｕに、Ｖref ２とＶre
f ４を0.3 ｐｕで動作するように設定したとすると、系
統電圧が0.3 ｐｕ以上ではオアゲートＯＲ１の出力信号
ｍ１が選択回路ＳＬに入力され、系統電圧が0.3ＰＵ以
下になるとオアゲートＯＲ１とオアゲートＯＲ２の出力
信号ｍ１，ｍ２が選択回路ＳＬに入力される。選択回路
ＳＬでは、入力がｍ１の場合は出力Ａ１を、入力がｍ１
とｍ２の場合は出力Ａ２を出力する。In FIG. 2, Vref 1 ... Vref 4 represent AC undervoltage relays that operate based on signals a and b from transformers PT1 and PT2 provided on AC buses AB1 and AB2 in FIG. Further, S1 indicates a switching mechanism that operates by a closing command of the circuit breaker CB of FIG. For example, Vref 1 and Vref 3 to 0.6 pu, Vref 2 and Vre
Assuming that f 4 is set to operate at 0.3 pu, the output signal m1 of the OR gate OR1 is input to the selection circuit SL when the system voltage is 0.3 pu or higher, and the output signal m1 of the OR gate OR1 and the OR gate OR2 is input when the system voltage becomes 0.3 PU or lower. The output signals m1 and m2 are input to the selection circuit SL. In the selection circuit SL, when the input is m1, the output A1 is output, and when the input is m1
And m2, the output A2 is output.
【００１４】次に交直変換器による電力融通から交流連
絡線の遮断器を併入した状態における具体的な保護につ
いて説明する。まず、遮断器の投入指令により切り換え
機構Ｓ１が動作し併入時の保護回路が形成される。この
時、切り換え機構により交直変換器単独運転時の保護回
路（電圧低下側バイパスペアＢＰＰ，健全側ゲートシフ
トＧＳ）は働かない。どちらかの交流系統故障により交
流電圧が低下するが0.3 ＰＵをしたまわらない状態では
選択回路からＡ１が出力され保護機構ＰＲ１が、0.3 Ｐ
Ｕ以下になる状態では選択回路からＡ２が出力され保護
機構ＰＲ２が働くように設定されている。Next, a concrete protection in the state where the breaker of the AC communication line is inserted from the power interchange by the AC / DC converter will be described. First, the switching mechanism S1 operates in response to the closing command of the circuit breaker to form a protection circuit for simultaneous closing. At this time, due to the switching mechanism, the protection circuit (voltage drop side bypass pair BPP, sound side gate shift GS) at the time of AC / DC converter independent operation does not work. The AC voltage drops due to a failure of either AC system, but in the state where 0.3 PU is not maintained, A1 is output from the selection circuit and the protection mechanism PR1 becomes 0.3 P.
In the state of becoming U or less, A2 is output from the selection circuit and the protection mechanism PR2 is set to operate.
【００１５】次に、保護機構ＰＲ１またはＰＲ２が働く
場合の交直変換器の回路状態を図３、図４を参照して説
明する。保護機構ＰＲ１が働く場合は、サイリスタバル
ブの転流は不能だが交流電圧は有る状態を想定してい
る。この場合、交直変換器の直流回路を流れる直流電流
は図３に示す様に流れる。この状態では、最悪故障が発
生する前に流れていた直流電流Ｉ１は、ＲＥＣ端をゲー
トブロックＧＢとすることで通電状態にあったバルブＸ
１，Ｗ１を通り変換器用変圧器２次巻線Ｌとで形成され
る回路に流れる。この場合、直流電流は回路の定数で決
まる時定数で減衰するが、半サイクル毎に加わる交流側
の逆方向電圧による電流により直流電流を打ち消し、最
終的にサイリスタバルブが消弧状態になる。また、交流
側の電圧が0.6 ＰＵ以上に回復するとＲＥＣ側をゲート
ブロックＧＢ→ゲートシフトＧＳし停止させることが可
能である。Next, the circuit state of the AC / DC converter when the protection mechanism PR1 or PR2 operates will be described with reference to FIGS. When the protection mechanism PR1 operates, it is assumed that commutation of the thyristor valve is impossible but AC voltage is present. In this case, the DC current flowing through the DC circuit of the AC / DC converter flows as shown in FIG. In this state, the DC current I1 that was flowing before the worst failure occurred is the valve X that has been energized by setting the REC end to the gate block GB.
1, W1 and flows into the circuit formed by the transformer transformer secondary winding L. In this case, the direct current is attenuated with a time constant determined by the constant of the circuit, but the direct current is canceled by the current due to the reverse voltage applied on the alternating side every half cycle, and the thyristor valve is finally extinguished. Further, when the voltage on the AC side recovers to 0.6 PU or more, it is possible to stop the REC side by performing the gate block GB → gate shift GS.
【００１６】保護機構ＰＲ２が働く場合は、交流電圧が
ほとんど零となった状態を想定している。この状態で
は、故障直後瞬時に系統電圧が零になるが、一時的に変
換器用変圧器二次巻線を通した直流側回路が形成され、
二次巻線抵抗による順電圧降下によりサイリスタバルブ
をバイパスペアＢＰＰ状態にする。図４に示す通り故障
事前まで流れていた直流電流Ｉ２が直流回路を還流し、
直流回路の定数で決まる時定数によって減衰していき最
終的にサイリスタバルブＺ１，Ｗ１が消弧される。この
時、直流電流Ｉ２の減衰は回路の時定数で決まるが、Ｒ
／Ｌ＝0.35と仮にするとＩ２＝80％で、Ｔ＝0.64ＳＥ
Ｃ、Ｉ２＝50％で、Ｔ＝1.97ＳＥＣ，Ｉ２＝10％で、Ｔ
＝6.56ＳＥＣとなり約７秒で直流電流は零になる。ま
た、交流側の電圧が0.6 ＰＵ以上に回復するとＲＥＣ側
をバイパスペアＢＰＰ→ゲートシフトＧＳし、停止させ
ることも可能である。When the protection mechanism PR2 operates, it is assumed that the AC voltage is almost zero. In this state, the system voltage immediately becomes zero immediately after the failure, but the DC side circuit that passes through the transformer secondary winding for the converter is temporarily formed,
The forward voltage drop due to the secondary winding resistance causes the thyristor valve to enter the bypass pair BPP state. As shown in FIG. 4, the DC current I2 that had flowed up to the time of the failure returns to the DC circuit,
The thyristor valves Z1 and W1 are finally extinguished by being attenuated by the time constant determined by the constant of the DC circuit. At this time, the attenuation of the DC current I2 is determined by the time constant of the circuit, but R
/L=0.35, I2 = 80%, T = 0.64SE
C, I2 = 50%, T = 1.97SEC, I2 = 10%, T
= 6.56SEC and the DC current becomes zero in about 7 seconds. Further, when the voltage on the AC side recovers to 0.6 PU or more, it is possible to stop the REC side by bypassing the bypass pair BPP → gate shift GS.
【００１７】以上述べたように本実施例では、交直変換
器運転と同時に交流連絡線を連系した状態で交流系統に
故障が発生し電圧が低下しても、変換器に悪影響を与え
ずに保護連動停止ができる。As described above, in the present embodiment, even if a failure occurs in the AC system and the voltage drops when the AC / DC converter is operating and the AC connecting line is connected, the converter is not adversely affected. The protection interlock can be stopped.
【００１８】なお、本発明は上記実施例に限定されるも
のではない。即ち、図３のＩＮＶ側をゲートブロックＧ
Ｂしても、上述した実施例と同一の効果を得ることがで
きる。また、図１では、交直変換設備の例を示している
が、直流送電系統における交直並列送電時にも適用可能
である。The present invention is not limited to the above embodiment. That is, the INV side of FIG.
Even with B, the same effect as the above-described embodiment can be obtained. Further, although FIG. 1 shows an example of the AC / DC conversion equipment, it is also applicable to AC / DC parallel transmission in a DC transmission system.
【００１９】[0019]
【発明の効果】以上述べたように本発明によれば、交直
変換器によって連系した２つの交流系統間に交直変換器
と並列に交流連絡線を設置した交直変換設備で、交直並
列運転を行う場合に交流連絡用遮断器の投入指令により
きりかわる切り換え機構を設け、更に交流系統電圧レベ
ルにより保護方式を自動選択する回路を設けたので、交
流系統故障による変換器への影響をなくす変換器保護連
動を容易に可能とするが提供できる。As described above, according to the present invention, AC / DC parallel operation is performed by AC / DC conversion equipment in which an AC connection line is installed in parallel with the AC / DC converter between two AC systems connected by the AC / DC converter. A switching mechanism that changes depending on the closing command of the AC circuit breaker when performing it and a circuit that automatically selects the protection method according to the AC system voltage level are installed, so the converter that eliminates the effect on the converter due to AC system failure It is possible to provide protection interlocking easily.
【図１】本発明が適用される電力系統の構成一例を示す
系統構成図FIG. 1 is a system configuration diagram showing an example of a configuration of a power system to which the present invention is applied.
【図２】本発明による交直並列運転時の変換保護回路の
一実施例を説明するためのブロック図FIG. 2 is a block diagram for explaining an embodiment of a conversion protection circuit during AC / DC parallel operation according to the present invention.
【図３】保護回路実施例による直流回路の作用を説明す
るための図FIG. 3 is a diagram for explaining the operation of a DC circuit according to an embodiment of a protection circuit.
【図４】保護回路実施例による直流回路の作用を説明す
るための図FIG. 4 is a diagram for explaining the operation of a DC circuit according to an embodiment of a protection circuit.
Ｇ11，Ｇ12，Ｇ1n，Ｇ21，Ｇ22，Ｇ2n…発電機、Ｒ１，
Ｒ２…交流負荷、ＳＳ１，ＳＳ２…開閉所、ＡＬ１，Ａ
Ｌ２…交流送電線、ＡＢ１，ＡＢ２…交流母線、ＰＴ
１，ＰＴ２…変成器、ＣＴ１，ＣＴ２…変換器用変圧
器、ＢＴＢ１，ＢＴＢ２…交直変換器、ＤＣＬ…直流リ
アクトル、ＣＢ…連系線遮断器、ＩＣＳ…交直連系変換
所、Ｖref １，Ｖref ４…交流不足電圧リレー、Ｓ１…
切り換え機構、ＯＲ１，ＯＲ２…論理和回路、ｍ１，ｍ
２…論理和回路出力、ＳＬ…選択回路、Ａ１，Ａ２…選
択回路出力、ＰＲ１，ＰＲ２…保護機構回路、Ｘ１，Ｙ
１，Ｚ１，Ｕ１，Ｖ１，Ｗ１…サイリスタバルブ、Ｌ…
変換器用変圧器二次巻線、Ｉ１，Ｉ２…直流電流。G11, G12, G1n, G21, G22, G2n ... Generator, R1,
R2 ... AC load, SS1, SS2 ... Switchyard, AL1, A
L2 ... AC power transmission line, AB1, AB2 ... AC bus line, PT
1, PT2 ... Transformer, CT1, CT2 ... Transformer for transformer, BTB1, BTB2 ... AC / DC converter, DCL ... DC reactor, CB ... Interconnection line breaker, ICS ... AC / DC interconnection station, Vref 1, Vref 4 ... AC undervoltage relay, S1 ...
Switching mechanism, OR1, OR2 ... OR circuit, m1, m
2 ... OR circuit output, SL ... selection circuit, A1, A2 ... selection circuit output, PR1, PR2 ... protection mechanism circuit, X1, Y
1, Z1, U1, V1, W1 ... Thyristor valve, L ...
Transformer transformer secondary windings, I1, I2 ... DC current.
Claims (7)
を交直変換器を介して連系している状態で、この交直変
換器に併設された交流連系連絡線のしゃ断器を投入し交
直並列運転する際、このしゃ断器の投入信号あるいは投
入指令信号に連動し、交流系統不足電圧時バイパスペア
する前記交直変換器の常時の保護連動操作の設定を、順
変換側あるいは逆変換側のいずれか一方の交直変換器を
交流電力不足電圧時ゲートブロックする保護連動操作の
設定に切り換えることを特徴とする交直変換器の保護方
法。1. In the state where one AC power system and another AC power system are interconnected via an AC / DC converter, a circuit breaker for an AC interconnecting communication line attached to this AC / DC converter is turned on. When operating in parallel / serial operation, the setting of the continuous protection interlocking operation of the AC / DC converter, which is interlocked with the closing signal or the closing command signal of the circuit breaker and bypass-pairs when the AC system is undervoltage, is set to the forward conversion side or the reverse conversion side. A protection method for an AC / DC converter, characterized in that one of the AC / DC converters is switched to a protection interlocking operation setting for gate blocking when AC power is undervoltage.
足電圧の状態を交直変換器のサイリスタバルブの転流は
不能であるが交流電圧は有る状態とすることを特徴とす
る請求項１記載の交直変換器の保護方法。2. The state of the AC system undervoltage in which the protection interlocking operation operates is set to a state in which the commutation of the thyristor valve of the AC / DC converter is impossible but the AC voltage is present. How to protect the AC / DC converter.
おいて、交流系統の電圧が所定値まで回復したとき前記
保護連動操作によりゲートブロックした交直変換器をゲ
ートシフトし停止させることを特徴とする交直変換器の
保護方法。3. The method of protecting an AC / DC converter according to claim 1, wherein the AC / DC converter gate-blocked by the protection interlocking operation is gate-shifted and stopped when the voltage of the AC system recovers to a predetermined value. How to protect the AC / DC converter.
器の保護装置において、交流電力系統電圧が所定値より
低下したとき不足電圧を検出する電圧検出手段と、前記
交直変換器に併設された交流連系連絡線のしゃ断器の投
入信号あるいは投入指令信号を入力し切り換え信号を出
力する切り換え手段と、前記切り換え信号により順変換
側あるいは逆変換側のいずれか一方の交直変換器を前記
電圧検出手段が不足電圧を検出した時ゲートブロックす
る保護連動操作手段とを具備することを特徴とする交直
変換器の保護装置。4. A protection device for an AC / DC converter that interconnects two AC power systems, and a voltage detecting means for detecting an undervoltage when the AC power system voltage drops below a predetermined value, and the AC / DC converter provided together. The switching means for inputting the closing signal or closing command signal of the breaker of the AC interconnection communication line and outputting the switching signal, and the AC / DC converter on either the forward conversion side or the reverse conversion side according to the switching signal A protection device for an AC-DC converter, comprising: protection interlocking operation means for gate blocking when the detection means detects an undervoltage.
おいて、交直変換器の順変換側または逆変換側の少なく
ともいずれか一方の交流電力系統電圧を検出する電圧検
出器と、この電圧検出器の出力電圧が第１の所定値より
低下したとき動作する第１段不足電圧継電器およびこの
電圧検出器の出力電圧が第１の所定値より小さい第２の
所定値より低下したとき動作する第２段不足電圧継電器
と、前記切り換え手段の切り換え信号に応じ、前記第１
段不足電圧継電器が動作したとき順変換側あるいは逆変
換側のいずれか一方の交直変換器をゲートブロックする
と共に他方の交直変換器をバイパスペアし、前記第２段
不足電圧継電器が動作したとき順変換側および逆変換側
の交直変換器をバイパスペアする保護連動操作手段とを
具備することを特徴とする交直変換器の保護装置。5. The protection device for an AC-DC converter according to claim 4, wherein a voltage detector for detecting an AC power system voltage of at least one of a forward conversion side and an inverse conversion side of the AC-DC converter, and this voltage detection. First undervoltage relay that operates when the output voltage of the device drops below a first predetermined value and a first stage undervoltage relay that operates when the output voltage of the voltage detector drops below a second predetermined value that is smaller than the first predetermined value. According to the switching signal of the two-stage undervoltage relay and the switching means, the first
When the second stage undervoltage relay operates, when either the forward conversion side or the reverse conversion side is gate-blocked and the other side AC / DC converter is bypass-paired when the second stage undervoltage relay operates. A protection device for an AC / DC converter, comprising: protection interlocking operation means for bypass-pairing the AC / DC converter on the conversion side and the inverse conversion side.
器の保護装置において、交流系統の電圧が所定値まで回
復したとき前記保護連動操作によりゲートブロックした
交直変換器をゲートシフトし停止させることを特徴とす
る交直変換器の保護装置。6. The protection device for an AC / DC converter according to claim 4 or 5, wherein the AC / DC converter gate-blocked by the protection interlocking operation is gate-shifted and stopped when the voltage of the AC system recovers to a predetermined value. A protective device for an AC / DC converter, which is characterized in that
において、交流系統の電圧が所定値まで回復したとき前
記第２段不足電圧継電器の動作による前記保護連動操作
によりバイパスペアした交直変換器をゲートシフトし停
止させることを特徴とする交直変換器の保護装置。7. The AC / DC converter protection device according to claim 5, wherein the AC / DC conversion is bypass-paired by the protection interlocking operation by the operation of the second stage undervoltage relay when the voltage of the AC system recovers to a predetermined value. A protective device for an AC / DC converter, characterized in that the device is gate-shifted and stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5225283A JPH0779532A (en) | 1993-09-10 | 1993-09-10 | Method and unit for protecting ac/dc converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5225283A JPH0779532A (en) | 1993-09-10 | 1993-09-10 | Method and unit for protecting ac/dc converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0779532A true JPH0779532A (en) | 1995-03-20 |
Family
ID=16826913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5225283A Pending JPH0779532A (en) | 1993-09-10 | 1993-09-10 | Method and unit for protecting ac/dc converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0779532A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012508552A (en) * | 2008-11-10 | 2012-04-05 | シーメンス アクティエンゲゼルシャフト | Device for supplying power from the supply network to the consumer network |
| CN111555332A (en) * | 2020-03-31 | 2020-08-18 | 南京南瑞继保电气有限公司 | Fault processing device and method and hybrid direct-current power transmission system |
| CN113922344A (en) * | 2021-09-29 | 2022-01-11 | 广东电网有限责任公司 | AC fault protection method, device, electronic equipment and storage medium |
-
1993
- 1993-09-10 JP JP5225283A patent/JPH0779532A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012508552A (en) * | 2008-11-10 | 2012-04-05 | シーメンス アクティエンゲゼルシャフト | Device for supplying power from the supply network to the consumer network |
| CN111555332A (en) * | 2020-03-31 | 2020-08-18 | 南京南瑞继保电气有限公司 | Fault processing device and method and hybrid direct-current power transmission system |
| CN113922344A (en) * | 2021-09-29 | 2022-01-11 | 广东电网有限责任公司 | AC fault protection method, device, electronic equipment and storage medium |
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