JPS5931309B2 - Parallel operation protection method for inverter equipment - Google Patents
Parallel operation protection method for inverter equipmentInfo
- Publication number
- JPS5931309B2 JPS5931309B2 JP54084722A JP8472279A JPS5931309B2 JP S5931309 B2 JPS5931309 B2 JP S5931309B2 JP 54084722 A JP54084722 A JP 54084722A JP 8472279 A JP8472279 A JP 8472279A JP S5931309 B2 JPS5931309 B2 JP S5931309B2
- Authority
- JP
- Japan
- Prior art keywords
- detector
- inverter
- inverter device
- parallel operation
- pulse width
- 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
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Protection Of Static Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Description
【発明の詳細な説明】 本発明はインバータ装置の並列運転保護方式に関する。[Detailed description of the invention] The present invention relates to a parallel operation protection method for an inverter device.
従来一般に、電源システムとしての高信頼性を実現する
ために、インバータ装置の１台が故障しても、他のイン
バータ装置より負荷へ給電を継続できる、いわゆるイン
バータ装置の並列運転が広く行なわれている。Conventionally, in order to achieve high reliability as a power supply system, so-called parallel operation of inverter devices has been widely used, which allows power to continue being supplied to the load from other inverter devices even if one of the inverter devices fails. There is.
このようなインバータ装置の並列運転では、故障インバ
ータ装置を並列運転から切り離して、この影響が負荷や
他の健全なインバータ装置に波及することを防ぐことが
必要である。In such parallel operation of inverter devices, it is necessary to separate the faulty inverter device from the parallel operation to prevent its influence from spreading to the load and other healthy inverter devices.
このためインバータ装置には異常動作を検出する検出器
が設けられる。例えば、この異常検出器の例として、イ
ンバータ装置のインバータ部のパルス巾変化の異常を検
出する検出器について以下述べる。インバータ装置の並
列運転では、インバータ部のパルス巾が僅かに変化して
も、インバータ装置相互間に電圧差を生じ、装置の内部
インピーダンスが小さいために、大きな不平衡電流が流
れ、並列運転しているインバータ装置の全てが停止して
しまうことになる。For this reason, the inverter device is provided with a detector that detects abnormal operation. For example, as an example of this abnormality detector, a detector that detects an abnormality in pulse width change in an inverter section of an inverter device will be described below. In parallel operation of inverter devices, even a slight change in the pulse width of the inverter section causes a voltage difference between the inverter devices, and because the internal impedance of the devices is small, a large unbalanced current flows, causing parallel operation. All of the inverter devices in the system will stop.
従つてパルス巾異常検出器は、不平衡電流の小さい間に
、換言すればパルス巾の微少な変化を検出できなければ
ならない。ところが反面、インバータ装置は負荷や電源
の変動に際しても出力電圧を一定に保たなければならな
いから、インバータ部のパルス巾は断えず相当大きく変
化することになる。そしてこのパルス巾の変化は大きく
ても正常な制御動作であるからパルス巾異常検出器は検
出動作をしてはならない。このように、パルス巾異常検
出器の例からも明らかなように２つの相反する性能を同
時に有する異常検出器を実現することは困難であつた。Therefore, the pulse width abnormality detector must be able to detect minute changes in the pulse width while the unbalanced current is small. However, on the other hand, since the inverter device must keep the output voltage constant even when the load or power supply fluctuates, the pulse width of the inverter section constantly changes considerably. Even if this pulse width change is large, it is a normal control operation, so the pulse width abnormality detector must not perform any detection operation. In this way, as is clear from the example of the pulse width anomaly detector, it has been difficult to realize an anomaly detector that simultaneously has two contradictory performances.
本発明はこのような点に鑑みてなされたもので、並列運
転されるインバータ装置において、インバータ装置の異
常動作を検出する検出器と、インバータ装置の出力電流
の不平衡量が所定値以上になると動作する検出器とを備
え、この２つの検出器が同時に動作した時インバータ装
置を並列運転から切り離すようにしたことを特徴とする
インバータ装置の並列運転保護方式を提供せんとするも
のである。以下図面を用いて本発明を詳述する。The present invention has been made in view of these points, and includes a detector that detects abnormal operation of the inverter device and a detector that operates when the unbalance amount of the output current of the inverter device exceeds a predetermined value in the inverter device operated in parallel. The object of the present invention is to provide a parallel operation protection method for an inverter device, which is characterized in that the inverter device is provided with a detector that operates simultaneously, and the inverter device is separated from parallel operation when the two detectors operate simultaneously. The present invention will be explained in detail below using the drawings.
まず、従来のインバータ装置の並列運転保護方式につい
て、図によつて説明する。First, a conventional parallel operation protection method for an inverter device will be explained using figures.
第１図は従来のインバータ装置の並列運転の構成を示す
図で、１，２はインバータ装置、３は交流電源、４は負
荷、５は不平衡量検出器である。インバータ装置１は交
流電源３から交流を受電し、順変換器１１で直流に変換
し、その出力１０１をインバータ部１２で矩形状の交流
に逆変換し、その出力１０２をさらに出力変圧器とフイ
ルタで構成される出力部１３で所定の電圧値の正弦波交
流に整形する。そして出力部１３の出力１０３をインタ
ーラプタ１４を経て負荷４へ供給する。インターラプタ
１４はインバータ装置１を並列運転から切り離すための
もので、サイリスタを用いた高速ＡＣスイツチである。
またインバータ装置１の出力電流が変流器１５により検
出され、この検出出力１０４が不平衡量検出器５に供給
される。FIG. 1 is a diagram showing the configuration of a conventional inverter device in parallel operation, where 1 and 2 are inverter devices, 3 is an AC power supply, 4 is a load, and 5 is an unbalance amount detector. The inverter device 1 receives alternating current from an alternating current power source 3, converts it into direct current with a forward converter 11, inversely converts its output 101 into rectangular alternating current with an inverter section 12, and further converts the output 102 into a rectangular alternating current through an output transformer and a filter. The output unit 13 is configured to shape the AC signal into a sinusoidal AC signal having a predetermined voltage value. Then, the output 103 of the output section 13 is supplied to the load 4 via the interrupter 14. The interrupter 14 is for separating the inverter device 1 from parallel operation, and is a high-speed AC switch using a thyristor.
Further, the output current of the inverter device 1 is detected by the current transformer 15, and this detection output 104 is supplied to the unbalance amount detector 5.
不平衡量検出器５は、インバータ装置１，２相互間の出
力電流の不平衡量を検出するものである。８して検出さ
れた出力１０５の不平衡量を後述する制御回路１６へフ
イードバツクし、不平衡量が零になるよう制御回路１６
が動作することでインバータ装置１，２の並列運転を維
持する。The unbalance amount detector 5 detects the amount of unbalance in the output currents between the inverter devices 1 and 2. The amount of unbalance of the output 105 detected by 8 is fed back to the control circuit 16, which will be described later, and the control circuit 16 controls the amount of unbalance to become zero.
By operating, the parallel operation of the inverter devices 1 and 2 is maintained.
制御回路１６は前述した機能の他、インバータ装置１の
出力電圧を一定に保つようにインバータ部１２への点弧
信号を制御する。In addition to the functions described above, the control circuit 16 controls the ignition signal to the inverter section 12 so as to keep the output voltage of the inverter device 1 constant.
１７はパルス巾異常検出器で、インバータ部１２のパル
ス巾の変化量の異常を検出する。A pulse width abnormality detector 17 detects an abnormality in the amount of change in the pulse width of the inverter section 12.
このパルス巾異常検出器１７が動作すると、その出力１
０６がインターラプタ１４に送られ、インバータ装置１
を並列運転から切り離す。なおインバータ装置２の構成
は、インパータ装置１と同一であるから省略してある。When this pulse width abnormality detector 17 operates, its output 1
06 is sent to the interrupter 14, and the inverter device 1
is separated from parallel operation. Note that the configuration of the inverter device 2 is the same as that of the inverter device 1, so it is omitted.
このような構成のインバータ装置の並列運転において、
パルス巾異常検出器１７はインバータ部１２の微妙なパ
ルス巾の変化を検出することができるものでなければな
らない（検出感度が高くなければならない）。In parallel operation of inverter devices with such a configuration,
The pulse width abnormality detector 17 must be able to detect subtle changes in the pulse width of the inverter section 12 (it must have high detection sensitivity).
なんとなれば、インバータ部１２の僅かなパルス巾の変
化でもその影響がインバータ装置１，２間の電圧差とし
て表わ法インバータ装置１，２の内部インピーダンスが
小さいために相当量の不平衡電流が流れ、最悪の場合は
並列運転が行えなくなることもある。従つてパルス巾異
常検出器１７は高検出感度であることが必要である。と
ころがインバータ装置は電源や負荷の変動に際しても、
出力電圧を一定に保たなければならず、”このためイン
バータ部１２のパルス巾は制御回路１６からの点弧信号
により、断えず変化している。This is because even a slight change in the pulse width of the inverter unit 12 has an effect as a voltage difference between the inverters 1 and 2. Because the internal impedance of the inverters 1 and 2 is small, a considerable amount of unbalanced current is generated. In the worst case, parallel operation may not be possible. Therefore, the pulse width abnormality detector 17 needs to have high detection sensitivity. However, inverter devices do not operate smoothly even when the power supply or load fluctuates.
The output voltage must be kept constant, and therefore the pulse width of the inverter section 12 is constantly changing depending on the ignition signal from the control circuit 16.
そしてこのパルス巾の変化は相当大きいこともあるが、
正常な制御動作であり、この変化でパルス巾異常検出器
１７が検出動作をしてはならない。このように、一方で
はパルス巾の微少変化をも検出する機能と、他方では相
当大きなパルス巾変化でも検出しない機能という、相反
する２つの機能を有する異常検出器を実現することは困
難であつた。従つて実際には正常な制御動作による変化
量では動作しないようパルス巾異常検出器１７の検出感
度を下げて使用しているため、異常時にインバータ装置
相互間の不平衡電流が大きくなりすぎ、しばしばインバ
ータ装置１，２共事故停止してしまうという不具合があ
つた。本発明はこのような不具合な点を除去したもので
、以下本発明を実施例図にもとづいて説明する。And although this change in pulse width can be quite large,
This is a normal control operation, and the pulse width abnormality detector 17 must not perform a detection operation due to this change. In this way, it has been difficult to realize an anomaly detector that has two contradictory functions: on the one hand, the ability to detect minute changes in pulse width, and on the other hand, the ability to not detect even fairly large changes in pulse width. . Therefore, in practice, the detection sensitivity of the pulse width abnormality detector 17 is lowered so that the pulse width abnormality detector 17 does not operate with the amount of change caused by normal control operation, so when an abnormality occurs, the unbalanced current between the inverter devices becomes too large, and it often occurs. There was a problem in which both inverter devices 1 and 2 stopped due to an accident. The present invention eliminates such disadvantages, and the present invention will be explained below based on the drawings of the embodiments.
第２図は本発明の一実施例を示す構成図である。第２図
において第１図と同一機能を有するものは同一番号を符
して示してある。第１図と異なる箇所はレベル検出器１
８とＡＮＤ回路１９が図示の如く追加されている。レベ
ル検出器１８は、不平衡検出器５の出力１０５が所定値
以上になると検出動作をするものであつて、この検出動
作による出力１０７を．ＡＮＤ回路１９の一方の入力と
し、ＡＮＤ回路１９の他方の入力にパルス巾異常検出器
１７の出力１０６′を接続して、パルス巾異常検出器１
７とレベル検出器１８の両方が同時に検出ノ 動作をし
た時、ＡＮＤ回路１９の出力１０８によリインターラブ
タ１４を動作させて、インバータ装置１を並列運転から
切り離すよう構成したものである。ところでインバータ
装置１，２の並列運転では、不平衡電流が完全に零にな
る必要は必ずしも要しないから、レベル検出器１８の所
定値を極端に小さくする必要はない。FIG. 2 is a configuration diagram showing an embodiment of the present invention. In FIG. 2, parts having the same functions as those in FIG. 1 are designated by the same numbers. The difference from Figure 1 is level detector 1.
8 and an AND circuit 19 are added as shown. The level detector 18 performs a detection operation when the output 105 of the unbalance detector 5 exceeds a predetermined value, and outputs an output 107 resulting from this detection operation. The output 106' of the pulse width abnormality detector 17 is connected to one input of the AND circuit 19, and the output 106' of the pulse width abnormality detector 17 is connected to the other input of the AND circuit 19.
When both the level detector 7 and the level detector 18 perform a detection operation at the same time, the output 108 of the AND circuit 19 operates the reinterverter 14 to disconnect the inverter device 1 from the parallel operation. By the way, in the parallel operation of the inverter devices 1 and 2, it is not necessary that the unbalanced current becomes completely zero, so it is not necessary to make the predetermined value of the level detector 18 extremely small.
すなわち、インバータ装置の正常運転の限界値から安全
を見込んで、一方正常な制御動作であつても過渡的には
不平衡電流が流れるので、これによつて検出動作をしな
いよう、これにも安全を見込んでレベル検出器１８の所
定値は、概略定格の２０％程度が良い。また従来の実施
例では検出感度を高めることができなかつたパルス巾異
常検出器１７も、本来の目的どおり微少なパルス巾変化
をも検出可能なようにすることができる。In other words, safety is taken into consideration based on the limit values for normal operation of the inverter, but even during normal control operation, an unbalanced current flows transiently, so safety measures are taken to prevent detection operations from occurring due to this. Considering this, the predetermined value of the level detector 18 is preferably about 20% of the approximate rating. Further, the pulse width abnormality detector 17, which was unable to increase its detection sensitivity in the conventional embodiment, can be made to be able to detect even minute changes in pulse width as originally intended.
すなわち本発明ではパルス巾異常検出器１７の検出感度
を高めた結果、正常な制御動作において検出動作をした
としても、不平衡量はレベル検出器１８の所定値を越え
ないから、インバータ装置１は並列運転から切り離され
ることはない。またインバータ部１２が、僅かでもあつ
ても異常なパルス巾変化を起こすとその結果不平衡量が
増大し、その増大がレベル検出器１８の所定値以下であ
るなら問題ないが、レベル検出器１８の所定値を越える
と、これが検出動作して出力１０７がＡＮＤ回路１９に
入力される。That is, in the present invention, as a result of increasing the detection sensitivity of the pulse width abnormality detector 17, even if a detection operation is performed during normal control operation, the amount of unbalance will not exceed the predetermined value of the level detector 18, so that the inverter device 1 is connected in parallel. It is never separated from driving. Furthermore, if the inverter section 12 causes even a slight abnormal pulse width change, the amount of unbalance increases as a result.If the increase is less than the predetermined value of the level detector 18, there is no problem; When the predetermined value is exceeded, a detection operation is performed and the output 107 is input to the AND circuit 19.
このときパルス巾異常検出器１７とレベル検出器１８の
両方が同時に検出動作される条件が成立し、インバータ
装置１を並列運転から切り離すためのインターラプタ１
４か出力１０８により動作し、インバータ装置１を並列
運転から切り離す。ここで重要なことは、インバータ装
置１を並列運転から切り離す時の不平衡量は定格の２０
％程度附近であり、残つたインバータ装置２は正常運転
を継続でき、従来例のように不平衡量が大きくなりすぎ
、並列運転している全インバータ装置が事故停止してし
まわないことである。At this time, a condition is established in which both the pulse width abnormality detector 17 and the level detector 18 are operated for detection at the same time, and the interrupter 1 is activated to disconnect the inverter device 1 from parallel operation.
4 is operated by the output 108, and the inverter device 1 is separated from the parallel operation. What is important here is that the unbalance amount when disconnecting inverter device 1 from parallel operation is 20% of the rated value.
%, the remaining inverter devices 2 can continue normal operation, and all the inverter devices operating in parallel will not come to an accidental stop due to the unbalance amount becoming too large as in the conventional example.
以上パルス巾異常検出器１７を例にして説明したが、他
の異常検出器を追加すればさらに並列運転の保護機能が
高められる。Although the pulse width abnormality detector 17 has been described above as an example, the protection function of parallel operation can be further enhanced by adding other abnormality detectors.
その例を次に示し説明する。第３図は本発明の他の実施
例の構成図で、インバータ装置１のみを示す。An example of this will be shown and explained below. FIG. 3 is a block diagram of another embodiment of the present invention, in which only the inverter device 1 is shown.
第３図において第２図と同一番号のものは同一機能のも
のであり、２０は前述の符号１９と同様なＡＮＤ回路、
２１は０Ｒ回路である。また２２は発振器異常検出器で
あり、インバータ部１２への点弧信号の元になつている
発振器周波数の異常を検出するものである。すなわち第
３図は第２図に比し、発振器異常検出器２２が追加され
、この発振器異常検出器２２を前述したレベル検出器１
８が同時に検出動作をした時、インバータ装置１を並列
運転から切り離す機能が追加されている。インバータ装
置の並列運転では、インバータ部１２のパルス巾が変化
した結果、不平衡電流が増大するのと全く同一の理由で
、発振器の周波数が変化してもインバータ装置１，２間
に大きな不平衡電流が流れ、場合によつてはインバータ
装置全部が事故停止してしまうことになる。In FIG. 3, the same numbers as in FIG. 2 have the same functions, and 20 is an AND circuit similar to the above-mentioned numeral 19;
21 is an 0R circuit. Further, 22 is an oscillator abnormality detector, which detects an abnormality in the oscillator frequency that is the source of the ignition signal to the inverter section 12. That is, FIG. 3 is different from FIG. 2 in that an oscillator abnormality detector 22 is added, and this oscillator abnormality detector 22 is replaced by the level detector 1 described above.
A function is added to disconnect the inverter device 1 from the parallel operation when the inverter devices 8 perform a detection operation at the same time. In parallel operation of inverter devices, for the same reason that the unbalanced current increases as a result of a change in the pulse width of the inverter section 12, there is a large unbalance between the inverter devices 1 and 2 even if the oscillator frequency changes. Current flows, and in some cases, the entire inverter device may come to an accidental stop.
従つて発振器異常検出器２２はパルス巾異常検出器１７
と同様、検出感度が高くなければならない。ところが並
列運転では出力電流の不平衡量を略零に保つため、電圧
を制御することと同様、周波数も制御しなければならな
いことは周知であり、この正常な周波数の制御動作では
発振器異常検出器２２は検出動作をしてはならない。こ
のように相反する機能を合せ持つ異常検出器を実現する
ことは困難であり、また第１図の従来例のパルス巾異常
検出器１７と同様検出感度を下げて並列運転に使用した
としても、従来例と同程度の効果しか期待できないこと
は容易に想像できる。ところが、レベル検出器１８と組
み合せることにより、第２図のパルス巾異常検出器１７
と同様、発振器異常検出器２２の検出感度も本来の目的
にそつて高めることができる。Therefore, the oscillator abnormality detector 22 is the pulse width abnormality detector 17.
Similarly, detection sensitivity must be high. However, it is well known that in parallel operation, in order to keep the unbalanced amount of output current to approximately zero, it is necessary to control the frequency as well as the voltage, and in this normal frequency control operation, the oscillator abnormality detector 22 shall not perform any detection operation. It is difficult to realize an abnormality detector that has such contradictory functions, and even if the detection sensitivity is lowered and used for parallel operation like the conventional pulse width abnormality detector 17 shown in FIG. It is easy to imagine that only the same level of effect as the conventional example can be expected. However, by combining it with the level detector 18, the pulse width abnormality detector 17 shown in FIG.
Similarly, the detection sensitivity of the oscillator abnormality detector 22 can also be increased in accordance with the original purpose.
つまり周波数の正常な制御動作において、発振器異常検
出器２２が検出動作をしたとしても、不平衡量がレベル
検出器１８の所定値を越えない限り、インバータ装置１
は並列運転から切り離されない。また発振器が異常な動
作をすれば、それが微少であつてもその結果不平衡量が
増し、レベル検出器１８の所定値を越えれば、レベル検
出器１８は検出動作を行い、発振器異常検出器２２は検
出動作をしているからインバータ装置は並列運転から切
り離される。そしてこの時も不平衡量が定格の２０％附
近で切り離されるから、第２図と同様に残つたインバー
タ装置は正常運転を継続できる。このように、第３図で
は第２図の実施例と動作は同様であるが、パルス巾異常
検出器１７の他に、発振器異常検出器２２が加わり、電
圧と周波数の両方の異常を検出できるからインバータ装
置の並列運転の保護機能は第３図に比しさらに高められ
ている。In other words, in normal frequency control operation, even if the oscillator abnormality detector 22 performs a detection operation, as long as the unbalance amount does not exceed the predetermined value of the level detector 18, the inverter device 1
are not separated from parallel operation. Furthermore, if the oscillator operates abnormally, even if it is minute, the amount of unbalance increases, and if it exceeds a predetermined value of the level detector 18, the level detector 18 performs a detection operation, and the oscillator abnormality detector 22 Since is performing a detection operation, the inverter device is disconnected from parallel operation. At this time as well, since the unbalance amount is cut off at around 20% of the rated value, the remaining inverter device can continue normal operation as in FIG. 2. In this way, the operation in FIG. 3 is similar to that in the embodiment shown in FIG. 2, but in addition to the pulse width abnormality detector 17, an oscillator abnormality detector 22 is added, and abnormalities in both voltage and frequency can be detected. The protection function for parallel operation of the inverter device is further enhanced compared to that shown in FIG.
以上詳述したように、インバータ装置の並列運転におい
て、インバータ装置の異常動作を検出する検出器と、出
力電流の不平衡量が所定値以上になつた時動作する検出
器とが同時に動作した時、インバータ装置を並列運転か
ら切り離すようにすることによつて、従来例に比し、保
護機能が飛躍的に高められその効果は大きい。As detailed above, in parallel operation of inverter devices, when the detector that detects abnormal operation of the inverter device and the detector that operates when the amount of unbalanced output current exceeds a predetermined value operate at the same time, By separating the inverter device from parallel operation, the protection function is dramatically improved compared to the conventional example, and the effect is large.
最後に、前述の説明では２つの異常検出器について説明
したが、本発明はこの２つの異常検出器のみに制約され
るものではなく、さらに他の異常検出器、例えば直流電
圧異常検出器などを加えることによつて一層、保護機能
が充実することは言うまでもない。Finally, although the above description describes two abnormality detectors, the present invention is not limited to only these two abnormality detectors, and may also include other abnormality detectors, such as a DC voltage abnormality detector. It goes without saying that the addition of this will further enhance the protection function.
この異常検出器も、インバータ装置の直流電圧の変化に
より不平衡電流が増大するため、一方では高検出感度が
必要であり、また他方では電源変動などによる直流電圧
の変化を検出動作してはならないという相反する機能を
持たせなければならないことは、前記２つの異常検出器
と同様である。This abnormality detector also requires high detection sensitivity because unbalanced current increases due to changes in the DC voltage of the inverter, and on the other hand, it must not operate to detect changes in DC voltage due to power fluctuations, etc. Similar to the above two abnormality detectors, it is necessary to have these contradictory functions.
さらに本発明の説明では、説明の便宜上インバータ装置
の２台並列運転について述べたが、本発明は並列運転台
数にも制限はない。Furthermore, in the description of the present invention, for convenience of explanation, two inverter devices were operated in parallel, but the present invention is not limited to the number of inverter devices operated in parallel.
第１図は従来のインバータ装置の並列運転を示す構成プ
ロツク図、第２図は本発明の一実施を示す構成プロツク
図、第３図は本発明の他の実施例を示す構成プロツク図
である。
１，２・・・・・・インバータ装置、３・・・・・・交
流電源、４・・・・・・負荷、５・・・・・・不平衡検
出器、１１・・・・・・順変換器、１２・・・・・・イ
ンバータ部、１３・・・・・・出力部、１４・・・・・
・インターラプタ、１６・・・・・・制御回路、１７・
・・・・・パルス巾異常検出器、１８・・・・・ルベル
検出器、１９，２０・・・・・・ＡＮＤ回路、２１・・
・・・・０Ｒ回路、２２・・・・・・発振器異常検出器
。FIG. 1 is a block diagram showing the parallel operation of a conventional inverter device, FIG. 2 is a block diagram showing one embodiment of the present invention, and FIG. 3 is a block diagram showing another embodiment of the present invention. . 1, 2... Inverter device, 3... AC power supply, 4... Load, 5... Unbalance detector, 11... Forward converter, 12... Inverter section, 13... Output section, 14...
・Interrupter, 16... Control circuit, 17.
... Pulse width abnormality detector, 18 ... Lebel detector, 19, 20 ... AND circuit, 21 ...
...0R circuit, 22...Oscillator abnormality detector.
Claims (1)
タ装置を構成する各部の電圧、周波数およびパルス巾の
要素のうち、１つまたは複数の要素の量を検知し、これ
らの要素の過渡的な変化量が予定の値を越えたとき出力
を発生する第１の検出器と、前記インバータ装置の出力
電流の不平衡量が予定値を越えたとき出力を発生する第
２の検出器とを備え、前記第１と第２の検出器が同時に
動作したとき前記インバータ装置を並列運転から切り離
すことを特徴としたインバータ装置の並列運転保護方式
。1. In parallel operation of an inverter device, the amount of one or more elements among the voltage, frequency, and pulse width elements of each part constituting the inverter device is detected, and the amount of transient change in these elements is estimated. a first detector that generates an output when the unbalance amount of the output current of the inverter device exceeds a predetermined value; A parallel operation protection method for an inverter device, characterized in that the inverter device is separated from parallel operation when a second detector operates simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54084722A JPS5931309B2 (en) | 1979-07-03 | 1979-07-03 | Parallel operation protection method for inverter equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54084722A JPS5931309B2 (en) | 1979-07-03 | 1979-07-03 | Parallel operation protection method for inverter equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5610080A JPS5610080A (en) | 1981-02-02 |
| JPS5931309B2 true JPS5931309B2 (en) | 1984-08-01 |
Family
ID=13838567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54084722A Expired JPS5931309B2 (en) | 1979-07-03 | 1979-07-03 | Parallel operation protection method for inverter equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5931309B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4929502A (en) * | 1986-10-14 | 1990-05-29 | American Cyanamid Company | Fibrillated fibers and articles made therefrom |
| JPH0556648A (en) * | 1991-08-21 | 1993-03-05 | Mitsubishi Electric Corp | Controller for parallel operation of pwm inverter |
| JPH05344773A (en) * | 1992-06-09 | 1993-12-24 | Mitsubishi Electric Corp | Parallel operation controller for pwm inverter |
| JP3226609B2 (en) * | 1992-06-24 | 2001-11-05 | 三菱電機株式会社 | Parallel operation control device for power converter |
-
1979
- 1979-07-03 JP JP54084722A patent/JPS5931309B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5610080A (en) | 1981-02-02 |
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