JPH0154930B2 - - Google Patents
Info
- Publication number
- JPH0154930B2 JPH0154930B2 JP55032480A JP3248080A JPH0154930B2 JP H0154930 B2 JPH0154930 B2 JP H0154930B2 JP 55032480 A JP55032480 A JP 55032480A JP 3248080 A JP3248080 A JP 3248080A JP H0154930 B2 JPH0154930 B2 JP H0154930B2
- Authority
- JP
- Japan
- Prior art keywords
- self
- inverter
- power
- grid
- excited
- 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
- 230000005856 abnormality Effects 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 description 12
- 239000004065 semiconductor Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Description
【発明の詳細な説明】
本発明は自励インバータと電力系統との連系運
転システムにおいて、自励インバータと電力系統
のいずれが故障か判別し得ない場合の保護方法に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a protection method in a system for interconnected operation of a self-excited inverter and an electric power system when it cannot be determined whether the self-excited inverter or the electric power system is at fault.
現在実用に供されている直流送電においては、
直流から交流への変換には他励インバータが用い
られている。これは他励インバータが自励インバ
ータに比べ、経済的に有利であることと、より信
頼性があることに起因している。しかし他励式イ
ンバータは電力系統が正常な状態でないと運転が
できないこと、インバータの容量に比べ系統の容
量が数倍以上大きくないと不安定に陥いり易いこ
と、及び電力系統が遅相電力を供給する必要があ
ることなどの欠点がある。一方、自励インバータ
は上述の制約がなく、電力系統なしに単独運転も
可能である。更に進相、遅相いずれの電力も供給
が可能である為に系統の安定化にも効果が期待さ
れ、且つインバータの信頼性も向上してきている
ことから、自励インバータによる系統連系が、実
現する可能性がでてきた。 In the DC power transmission currently in practical use,
A separately excited inverter is used to convert direct current to alternating current. This is because separately excited inverters are more economically advantageous and more reliable than self-excited inverters. However, separately excited inverters cannot operate unless the power grid is in a normal state, tend to become unstable unless the grid capacity is several times larger than the inverter capacity, and the power grid supplies lagging power. There are drawbacks such as the need to On the other hand, self-excited inverters do not have the above-mentioned restrictions and can operate independently without a power grid. Furthermore, since it is possible to supply both phase-leading and phase-lag power, it is expected to be effective in stabilizing the grid, and as the reliability of inverters has also improved, grid interconnection using self-excited inverters is expected to be effective. There is a possibility that it will come true.
ところで自励インバータと他励インバータとで
は上述のように基本的な特性に差異があることか
ら判るように、系統連系においても当然従来の技
術とは異なる技術が必要となることは明らかであ
る。例えば系統が異常をきたすと他励インバータ
による場合は共倒れとなるが、自励インバータに
よる場合は系統を切り離して自励インバータのみ
で負荷への電力供給が可能であり、逆に自励イン
バータが異常の場合はこれを切り離して系統だけ
で負荷への電力供給を行なわせることは無論可能
である。ここで、明らかにどちらかが異常である
ことが分れば異常な方を切り離すことで解決でき
るが、原因によつては異常な部分を見つけ出すこ
とが不可能な場合もある。 By the way, as can be seen from the difference in basic characteristics between self-excited inverters and separately excited inverters as mentioned above, it is clear that a technology different from conventional technology is required even for grid connection. . For example, if a power grid malfunctions, if a separately excited inverter is used, the system will fail together, but if a self-excited inverter is used, it is possible to disconnect the grid and supply power to the load only with the self-excited inverter; conversely, if the self-excited inverter becomes abnormal In this case, it is of course possible to separate this and have the grid alone supply power to the load. Here, if one of the parts is clearly found to be abnormal, the problem can be solved by separating the abnormal part, but depending on the cause, it may be impossible to find the abnormal part.
本発明の目的は、前述のような場合の問題を解
決し負荷への給電を停止させないようにした自励
インバータと電力系統との連系運転における保護
方法を、電力系統側の諸設備に手を加えることな
く実施する方法を提供することにある。 The purpose of the present invention is to provide a protection method for interconnected operation between a self-excited inverter and a power grid, which solves the problems described above and prevents the power supply to the load from being stopped, and provides a method for handling various equipment on the power grid side. The objective is to provide a method for implementing this without adding additional information.
以下、図を参照して本発明を説明する。図は本
発明の一実施例であつて、１は直流電源、２は自
励インバータ、３は電力系統と接続する連系用リ
アクトル、４と１３はしや断器、５と１４は電圧
異常検出器、１１は電力系統、１２は系統のイン
ピーダンス、２１は連系点、２２は負荷をそれぞ
れ表している。１の直流電源としては交流−直流
変換位置が利用されるのが普通である。自励イン
バータ２と電力系統とは図示しない連系運転制御
回路によつて制御され、連系点２１の電圧が所定
の電圧範囲内にて且つ自励インバータの容量を超
えないようにして運転されている。しや断器の４
はとくに高速度の開閉動作が必要となるためサイ
リスタしや断器が使用される。 Hereinafter, the present invention will be explained with reference to the drawings. The figure shows one embodiment of the present invention, in which 1 is a DC power supply, 2 is a self-excited inverter, 3 is a reactor for connection to the power grid, 4 and 13 are disconnectors, and 5 and 14 are voltage abnormalities. 11 represents the power system, 12 represents the impedance of the system, 21 represents the interconnection point, and 22 represents the load. As the first DC power source, an AC-DC conversion position is normally used. The self-excited inverter 2 and the power grid are controlled by a grid connection operation control circuit (not shown), and are operated so that the voltage at the grid connection point 21 is within a predetermined voltage range and does not exceed the capacity of the self-excited inverter. ing. Shiya disconnection 4
In particular, thyristors and disconnectors are used because high-speed opening and closing operations are required.
このような構成において、しや断器４と１３は
共に閉で自励インバータの系統と電力系統が並列
に運転している状態で、インバータか電力系統に
異常が発生した場合の保護運動は次のように行な
われる。インバータ内部２は電力系統で明らかに
異常が発生したことが明確な場合、即ちインバー
タが転流失敗した場合とか、電力系統のどこかで
短絡が生じそれが系統内のどこかの点で検出され
た場合のように発生箇所が明確な場合は、それが
生じた側に接続されたしや断器４又は１３をしや
断すればよいことは明らかである。しかし連系運
転制御回路の異常や電力系統の地絡で連系点２１
の電圧が異常となつた場合のように、何か異常で
あるかを直ぐには判定することが不可能なときは
次の手順により不具合箇所を摘出することができ
る。 In such a configuration, when both the shield disconnectors 4 and 13 are closed and the self-excited inverter system and the power system are operating in parallel, the protective movement when an abnormality occurs in the inverter or the power system is as follows. It is done as follows. The inside of the inverter 2 is activated when it is clear that an abnormality has occurred in the power system, such as when the inverter fails to commutate, or when a short circuit occurs somewhere in the power system and is detected at some point in the system. If the location of the occurrence is clear, such as in the case where the problem occurred, it is obvious that it is sufficient to disconnect the disconnect switch 4 or 13 connected to the side where the problem occurred. However, due to an abnormality in the interconnection operation control circuit and a ground fault in the power grid, the interconnection point 2
When it is impossible to immediately determine whether something is abnormal, such as when the voltage becomes abnormal, the problem can be identified by the following procedure.
いま連系点２１の電圧が異常に低下したとする
と、電圧異常検出器５と１４のうち動作時間の早
い５が先に動作し、しや断器４を開放し連系運転
を中断する。その結果二つのしや断器４と１３の
入力点の電圧V1とV2の電圧の状態は次の四つの
状態に分けられる。(i)V1，V2共に正常、(ii)V1は
異常、V2は正常、(iii)V1は正常、V2は異常、(iv)
V1，V2共に異常。 If the voltage at the interconnection point 21 drops abnormally, the voltage abnormality detector 5 and 14, which operates earlier, operates first, opens the shield breaker 4, and interrupts the interconnection operation. As a result, the voltage states of the voltages V 1 and V 2 at the input points of the two shield breakers 4 and 13 can be divided into the following four states. (i) Both V 1 and V 2 are normal, (ii) V 1 is abnormal, V 2 is normal, (iii) V 1 is normal, V 2 is abnormal, (iv)
Both V 1 and V 2 are abnormal.
まず(i)の場合は、連系運転制御回路の異常によ
つてインバータ２と電力系統の間でいわゆる横流
が流れて電圧異常が発生したものと見なすことが
できる。従つて連系運転を行なわなければ負荷へ
の給電が可能となる公算が大きいので、しや断器
４のみを開放状態に保ち電力系統１１より負荷２
２へ給電する。もし電力系統の容量が負荷の必要
とする容量に比し小さいときは、図示しない過負
荷検出器が動作してしや断器１３も開放すること
があるが、一般の電力系統で行なわれているよう
に、自動再閉路が行なわれる。 First, in case (i), it can be considered that a so-called cross current flows between the inverter 2 and the power grid due to an abnormality in the grid-connected operation control circuit, resulting in a voltage abnormality. Therefore, there is a high possibility that power will be able to be supplied to the load unless grid-connected operation is performed, so only the shield breaker 4 is left open and the load 2 is transferred from the power grid 11.
2. If the capacity of the power system is smaller than the capacity required by the load, an overload detector (not shown) may operate and open the circuit breaker 13, but this is not done in a general power system. Automatic reclosing occurs as shown in the figure.
次に(ii)の場合は、インバータの電圧制御回路の
異常であるからインバータは使用せず、電力系統
のみを使つて負荷へ給電する。(iii)の場合は電力系
統の異常であるから、しや断器１３を直ちに開放
し、その後しや断器４を閉じる。この際注意する
ことは、V2が異常となつた原因が負荷であつた
場合には図示しない過負荷検出器で検出するの
で、その場合はしや断器を１３から４へ切換えな
い。もしくは負荷の一部を切り離した後にしや断
器を１３から４へ切換える。(iv)の場合、明らかに
両方共悪いときには一旦しや断器１３も開放し、
次に再閉路する。又自励インバータが異常で切り
離された結果、今度は過負荷の為にV2が異常と
なることも予想されるので(iii)と同様に処置する。 In case (ii), the inverter voltage control circuit is abnormal, so the inverter is not used and only the power grid is used to supply power to the load. In case (iii), there is an abnormality in the power system, so the shield breaker 13 is immediately opened, and the shield breaker 4 is then closed. At this time, it should be noted that if the cause of the abnormality in V 2 is the load, it will be detected by an overload detector (not shown), so in that case, do not switch the circuit breaker from 13 to 4. Alternatively, after disconnecting part of the load, switch the breaker from 13 to 4. In the case of (iv), if both are obviously bad, the disconnector 13 is also opened,
Next, the circuit is reclosed. Also, as a result of the self-excited inverter being disconnected due to an abnormality, it is expected that V 2 will become abnormal due to overload, so take the same steps as in (iii).
図の回路ではしや断器４と１３の電力供給側に
設けた電圧異常検出器５，１４により連系点２１
電圧異常の検出を兼ねているが、勿論連系点２１
に別の電圧異常検出器を設けてもよい。又図では
二つのしや断器はその出力端子を直接接続した図
が示されているが、電力系統側のしや断器１３は
連系用に新たに設けたものではなく、既に設置さ
れたものと考えてよいし、連系点としや断器１３
の間には変圧器などが接続されていてもよい。電
圧異常検出器１４は電力系統の監視のために通常
しや断器１３と共に設置されているものであつて
自励インバータ２との連系のために新たに設けた
ものではない。 In the circuit shown in the figure, the voltage abnormality detectors 5 and 14 installed on the power supply side of the disconnectors 4 and 13
It also serves as a voltage abnormality detection, but of course the interconnection point 21
A separate voltage abnormality detector may be provided. Also, in the figure, the output terminals of the two shield disconnectors are directly connected, but the shield disconnector 13 on the power grid side is not newly installed for grid connection, but is already installed. It can be considered as a connection point, and the
A transformer or the like may be connected between them. The voltage abnormality detector 14 is normally installed together with the insulation switch 13 for monitoring the power system, and is not newly installed for interconnection with the self-excited inverter 2.
以上は電圧異常を検出した後、自励インバータ
側のしや断器４を開放する場合を説明した。これ
は通常インバータ側が系統側に比べ容量が小さ
く、過負荷耐量が低いという前提に立つて述べた
ものであつて、もし系統側の容量がインバータ側
の容量に比べ小さいときは、逆に系統側のしや断
器１３を先に開放して電圧異常検出器５と１４の
状態判別を行なうことの方が、負荷への給電を極
力維持する為には妥当である。しや断器４と１３
はサイリスタ等の半導体しや断器を使用すること
が望ましいが、高価となるので異常時先に開閉す
る方のしや断器のみを半導体しや断器とし、他方
は機械的なしや断器とすればより経済性の高いシ
ステムが構成できる。 In the above, a case has been described in which the circuit breaker 4 on the self-excited inverter side is opened after detecting a voltage abnormality. This is based on the assumption that the inverter side normally has a smaller capacity than the grid side and has a lower overload capacity.If the grid side capacity is smaller than the inverter side capacity, then the grid side In order to maintain power supply to the load as much as possible, it is more appropriate to open the disconnector 13 first and determine the status of the voltage abnormality detectors 5 and 14. Shiya disconnector 4 and 13
It is desirable to use a semiconductor circuit breaker such as a thyristor, but it is expensive, so only the circuit breaker that opens and closes first in the event of an abnormality is a semiconductor circuit breaker, and the other is a mechanical circuit breaker. If so, a more economical system can be constructed.
以上のように本発明によれば、自励インバータ
と電力系統との連系運転にあたり、既存の電力系
統側のしや断器や電圧異常検出器に手を加えるこ
となく、自励インバータと電力系統のいずれかが
もしくは連系の為の連系運転制御回路が不良とな
つたか不明のまま連系点の電圧が異常を来した場
合、可能な限り負荷への給電を維持しながら故障
部分を発見し切り離すことができるので、電力系
統の運転の信頼性を向上することが可能となる。 As described above, according to the present invention, in interconnected operation between a self-excited inverter and a power grid, the self-excited inverter and the power If the voltage at the interconnection point becomes abnormal without knowing whether one of the grids or the interconnection operation control circuit for interconnection has become defective, fix the faulty part while maintaining power supply to the load as much as possible. Since it can be discovered and isolated, it is possible to improve the reliability of power system operation.
図は本発明が適用される系統連系システムの一
例を示す図である。
１……直流電源、２……自励インバータ、３…
…連系用リアクトル、４，１３……しや断器、
５，１４……電圧異常検出器、１１……電力系
統、１２……系統のインピーダンス、２１……連
系点、２２……負荷。
The figure is a diagram showing an example of a grid-connected system to which the present invention is applied. 1...DC power supply, 2...Self-excited inverter, 3...
...Reactor for interconnection, 4,13...Shield disconnector,
5, 14... Voltage abnormality detector, 11... Power system, 12... System impedance, 21... Interconnection point, 22... Load.
Claims (1)
や断器と負荷側を結ぶ系統に、第２のしや断器と
連系用リアクトルを介して自励インバータが接続
された交流連系システムにおいて、前記電力供給
側および前記自励インバータ側にそれぞれ独立し
て電圧異常検出器を設け、前記電力供給側および
前記自励インバータ側のうち容量の小さい方の前
記異常検出器の動作時間を速くし、前記電力供給
側あるいは前記自励インバータ側のうち容量の小
さい方のしや断器を先に開放することを特徴とす
る自励インバータと電力系統との連系運転におけ
る保護方法。1. An AC interconnection system in which a self-excited inverter is connected to a system that connects a first inverter installed on the power supply side of the power system and a load side via a second inverter and a interconnecting reactor. In the system, voltage abnormality detectors are provided independently on the power supply side and the self-excited inverter side, and the operating time of the abnormality detector on the power supply side and the self-excited inverter side, whichever has a smaller capacity. A protection method for interconnected operation of a self-excited inverter and a power system, characterized in that the disconnector having a smaller capacity on the power supply side or the self-excited inverter side is opened first.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3248080A JPS56129529A (en) | 1980-03-14 | 1980-03-14 | Method of protecting self-excited inverter, power system and interlocking operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3248080A JPS56129529A (en) | 1980-03-14 | 1980-03-14 | Method of protecting self-excited inverter, power system and interlocking operation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56129529A JPS56129529A (en) | 1981-10-09 |
| JPH0154930B2 true JPH0154930B2 (en) | 1989-11-21 |
Family
ID=12360141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3248080A Granted JPS56129529A (en) | 1980-03-14 | 1980-03-14 | Method of protecting self-excited inverter, power system and interlocking operation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56129529A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0618461B2 (en) * | 1984-12-11 | 1994-03-09 | 株式会社日立製作所 | Parallel operation method for power converters |
-
1980
- 1980-03-14 JP JP3248080A patent/JPS56129529A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56129529A (en) | 1981-10-09 |
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