JPH06327258A - Protector for system interconnection - Google Patents
Protector for system interconnectionInfo
- Publication number
- JPH06327258A JPH06327258A JP5106308A JP10630893A JPH06327258A JP H06327258 A JPH06327258 A JP H06327258A JP 5106308 A JP5106308 A JP 5106308A JP 10630893 A JP10630893 A JP 10630893A JP H06327258 A JPH06327258 A JP H06327258A
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- JP
- Japan
- Prior art keywords
- inverter
- voltage
- power
- circuit
- phase
- 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.)
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Links
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- Supply And Distribution Of Alternating Current (AREA)
- Inverter Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、直流電力をインバ―タ
で交流電力に変換し電力系統に連系している場合の系統
連系保護装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system interconnection protection device for converting DC power into AC power by an inverter and connecting the system to a power system.
【０００２】[0002]
【従来の技術】従来の系統連系インバ―タの回路および
保護装置の代表例を図５に示しその構成について説明す
る。太陽電池や燃料電池などの直流電源１からインバ―
タブリッジ２を介して交流電力に変換し、リアクトル
３、コンデンサ４から成るフィルタ回路によりＰＷＭに
よる高周波成分をフィルタし、電流検出器５で電流を検
出して、ＰＷＭ制御により交流電源へ注入する電流を力
率１に制御することが行われている。2. Description of the Related Art A typical example of a conventional system interconnection inverter circuit and protection device is shown in FIG. Inverter from DC power source 1 such as solar cell or fuel cell
It is converted to AC power via the bridge 2, the high frequency component by PWM is filtered by the filter circuit consisting of the reactor 3 and the capacitor 4, the current is detected by the current detector 5, and the current injected into the AC power supply is controlled by PWM. The power factor is controlled to 1.
【０００３】交流電源（交流系統）８から柱上変圧器６
を介して降圧し、遮断器７を通って一般家庭の負荷９に
電力が供給されている。我国では単相３線式でＡＣ２０
０Ｖ（中点間はそれぞれ１００Ｖ）が供給されるのが一
般的である。現在では１００Ｖ負荷が多いが今後２００
Ｖ負荷が増加する傾向にある。AC power supply (AC system) 8 to pole transformer 6
Through the circuit breaker 7, electric power is supplied to the load 9 of a general household. AC20 in single-phase three-wire system in Japan
Generally, 0 V (100 V between the midpoints) is supplied. Currently, there are many 100V loads, but in the future 200
The V load tends to increase.
【０００４】直流電源１が太陽電池の場合は太陽電源か
ら最大電力を取り出すために電圧基準10と直流電源１の
電圧が比例するよう制御する電圧一定制御が行われてい
る。電圧基準10と直流電源１の電圧差を増幅器11で増幅
し出力Ｖ11を電流基準回路12により交流電源ＶACからバ
ンドパスフィルタ16を介した正弦波とＶ11を掛算して交
流電流基準Ｖ12を出力する。When the DC power supply 1 is a solar cell, a constant voltage control is performed so that the voltage reference 10 and the voltage of the DC power supply 1 are proportional to each other in order to extract the maximum power from the solar power supply. Voltage reference 10 and the voltage difference between the DC power source 1 is amplified by the amplifier 11 output V 11 of the current reference circuit 12 by the AC power source AC from V AC by multiplying a sine wave and V 11 through the band-pass filter 16 current reference V Output 12
【０００５】Ｖ12と電流検出器５の出力を比較し増幅器
13で増幅しＰＷＭ回路14によりＰＷＭ信号に変換し駆動
回路15によりインバ―タブリッジ２をＰＷＭすることに
より交流電源に注入する電流を電流基準Ｖ12に比例する
ような制御を行っている。The output of the current detector 5 is compared with V 12 and the amplifier is compared.
Amplification by 13 and conversion into a PWM signal by the PWM circuit 14 and PWM of the inverter bridge 2 by the drive circuit 15 are performed so that the current injected into the AC power supply is proportional to the current reference V 12 .
【０００６】このような配電系統における問題点は、交
流電源８から変圧器６を経て遮断器７を通って供給して
いる電力が、遮断器７を開にして配電系統を遮断して保
守などを行う場合、負荷９の電力とインバ―タから供給
する電力が無効電力を含めてバランスしている時の保護
である。The problem with such a power distribution system is that the power supplied from the AC power source 8 through the transformer 6 and the circuit breaker 7 opens the circuit breaker 7 to shut off the power distribution system for maintenance. This is a protection when the power of the load 9 and the power supplied from the inverter are balanced including the reactive power.
【０００７】従来、一般的には、電圧リレ―17と周波数
リレ―18によりインバ―タが接続されている交流電圧Ｖ
ACを監視し、異常になったことを検出し、異常検出回路
19によりインバ―タ駆動回路15を介してインバ―タを停
止し、場合によっては、インバ―タ出力に直列に挿入し
た接点を開として電力系統からインバ―タを解列してい
る。Conventionally, generally, an AC voltage V to which an inverter is connected by a voltage relay 17 and a frequency relay 18
Abnormality detection circuit that detects AC abnormalities by monitoring AC
The inverter is stopped by 19 via the inverter drive circuit 15, and in some cases, the contact inserted in series with the inverter output is opened to disconnect the inverter from the power system.
【０００８】[0008]
【発明が解決しようとする課題】ところが負荷９の有効
電力，無効電力とインバ―タから出力される有効電力，
無効電力がバランスしていると遮断器７が開となっても
負荷９には電圧が保たれて運転が継続することがある。
このことをアイランディング（islanding ）と呼んでい
る。However, the active power of the load 9, the reactive power and the active power output from the inverter,
When the reactive power is balanced, even if the circuit breaker 7 opens, the voltage may be maintained in the load 9 and the operation may continue.
This is called islanding.
【０００９】このアイランディングを防いで系統を保護
する方法として多くの提案がなされている。その主なも
のは次の通りである。 （１） 周波数変動方式、インバ―タ制御回路へ入力す
る系統参照電圧の位相に一定量のシフトをかけ、配電線
停止時にフィ―ドバック効果によりインバ―タ出力周波
数をずらせてこれを検出する方法である。（特開平3-25
6534のゆらぎ回路21） しかしこの方法では有効電力と無効電力が完全にバラン
スすると周波数や電圧が変化せず検出できない。 （２） 電力変動方式、インバ―タから出力する電力を
低周波で振動させバランスをくずして検出する方法（特
開平3-239124のゆらぎ回路21） しかしこの方法はインバ―タが多数台並列に接続される
と電力振動の位相がバラバラとなり全体で見ると電力変
動がない状態となり検出できない。 （３） 高調波電圧監視法 アイランディング時、電圧に第３，第５，第７高調波が
増加することにより検出する方法（高調波検出回路20） この方法、現在のように、インバ―タエアコン，テレビ
などのようなコンデンサインプット形整流回路の電源が
多く使用されるようになると定常時に第３，第５，第７
高調波が増加しているので検出の信頼性が著しく低下す
る。Many proposals have been made as a method for preventing the islanding and protecting the system. The main ones are as follows. (1) Frequency fluctuation method, a method in which the phase of the system reference voltage input to the inverter control circuit is shifted by a certain amount and the inverter output frequency is shifted by the feedback effect when the distribution line is stopped to detect this. Is. (JP-A-3-25
Fluctuation circuit of 6534 21) However, if active power and reactive power are perfectly balanced, this method cannot detect it because the frequency and voltage do not change. (2) Power fluctuation method, a method of detecting the power output from the inverter by vibrating it at a low frequency and breaking the balance (the fluctuation circuit 21 of Japanese Patent Laid-Open No. 3-239124) However, this method uses multiple inverters in parallel. When they are connected, the phases of power oscillations will be different, and when viewed as a whole, there will be no power fluctuations and detection will not be possible. (3) Harmonic voltage monitoring method A method to detect when the third, fifth and seventh harmonics increase in voltage at the time of islanding (harmonic detection circuit 20) , When the power supply of the capacitor input type rectifier circuit such as a television is used a lot, the third, fifth, seventh
Since the number of harmonics is increased, the reliability of detection is significantly reduced.
【００１０】以上のような方法では欠点が多く確実なア
イランディング検出ができなかった。本発明は、上記の
問題に鑑みてなされたもので、アイランディング時に確
実で信頼性の良い検出を行いインバ―タ停止により停電
を行うことを目的としている。The above-mentioned method has many defects and cannot reliably detect the eye landing. The present invention has been made in view of the above problems, and an object thereof is to perform reliable and reliable detection at the time of landing and to perform a power failure by stopping the inverter.
【００１１】[0011]
【課題を解決するための手段】上記の目的を達成するた
め、本発明は、直流電力を交流電力に変換し単相３線式
の交流系統へ連系するインバ―タを備えた装置におい
て、前記単相３線式の２つの線間電圧を比較して異常状
態を検出し、前記インバ―タの運転を停止させる手段を
設ける。In order to achieve the above object, the present invention provides an apparatus provided with an inverter for converting DC power into AC power and connecting the AC power to a single-phase three-wire AC system. Means is provided for comparing the two line voltages of the single-phase three-wire type to detect an abnormal state and stopping the operation of the inverter.
【００１２】また、前記単相３線式の２つの線間電圧を
比較して異常状態を検出したとき、前記インバ―タの無
効電力を含む出力電力を変動させ、電圧異常あるいは周
波数異常を検出して前記インバ―タの運転を停止させ
る。When an abnormal state is detected by comparing two line voltages of the single-phase three-wire type, the output power including the reactive power of the inverter is changed to detect a voltage abnormality or a frequency abnormality. Then, the operation of the inverter is stopped.
【００１３】[0013]
【作用】アイランディング時、インバ―タ出力電力と負
荷の電力がバランスしている時でも無効電力を含めて完
全にバランスする確率は殆どなく、単相３線式の２つの
線間電圧の電圧差（位相差，高調波を含む）を検出する
ことでアイランディングを検出してインバ―タを停止さ
せる。また、アイランディングを検出したとき、インバ
―タの出力電力を変動させ電圧や周波数を変化させるこ
とにより異常状態を検出してインバ―タを停止させる。[Operation] At the time of islanding, even if the inverter output power and the load power are balanced, there is almost no probability of complete balance including reactive power. By detecting the difference (including phase difference and harmonics), the islanding is detected and the inverter is stopped. Further, when the islanding is detected, the output power of the inverter is changed to change the voltage and frequency to detect an abnormal state and stop the inverter.
【００１４】[0014]
【実施例】本発明の実施例を図１に示しその構成を説明
する。図５と同一部分は同一番号を符したので説明は省
略する。負荷９ａはＬ1 ，Ｌ2 間（一般には２００Ｖ）
に接続され、負荷９ｂはＬ2 と中点（ア―ス）間に、負
荷９ｃはＬ1 と中点（ア―ス）間に接続されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIG. The same parts as those in FIG. The load 9a is between L 1 and L 2 (generally 200V)
The load 9b is connected between L 2 and the midpoint (earth), and the load 9c is connected between L 1 and the midpoint (earth).
【００１５】差電圧検出回路22はＬ1 と中点間とＬ2 と
中点間の電圧差を検出しレベル検出器23でレベル判定し
設定値以上になると異常と判断し時間函数回路24の出力
Ｖ24を出す。掛算回路25によりＶ11とＶ24を掛算した値
Ｖ25を電流基準回路12の入力として交流電流基準Ｖ12の
大きさを変動させるよう構成する。The differential voltage detection circuit 22 detects the voltage difference between L 1 and the midpoint and between L 2 and the midpoint, and the level detector 23 determines the level. When it exceeds a set value, it is determined to be abnormal and the time function circuit 24 Output V 24 . A value V 25 obtained by multiplying V 11 and V 24 by the multiplication circuit 25 is used as an input to the current reference circuit 12 to change the magnitude of the AC current reference V 12 .
【００１６】インバ―タ出力と負荷９ａ，９ｂ，９ｃの
合成負荷がバランスしている時、遮断器７を開放した場
合を考える。このような場合の等価回路は図２となって
いる。Consider a case in which the circuit breaker 7 is opened when the inverter output and the combined load of the loads 9a, 9b, 9c are balanced. The equivalent circuit in such a case is shown in FIG.
【００１７】インバ―タ出力電流ｉINV は交流電圧と同
相の正弦波（力率１）になるよう制御する電流制御形イ
ンバ―タが太陽電池を使用した系統連系用には使用され
ている。A current control type inverter for controlling the inverter output current i INV so that it has a sine wave (power factor of 1) in phase with the AC voltage is used for grid interconnection using solar cells. .
【００１８】このため負荷力率が１でインバ―タ出力と
バランスしている場合遮断器７を開放しても交流電源
（この場合負荷の電圧）の電圧値も周波数もほとんど変
化せず長時間運転をつづてしまうことが非常にまれでは
あるが発生することがある。Therefore, when the load power factor is 1 and is balanced with the inverter output, even if the circuit breaker 7 is opened, the voltage value and frequency of the AC power supply (in this case, the load voltage) hardly change, and Continuing driving can occur, albeit very rarely.
【００１９】図２においてＡ，Ｂ端から見た負荷電流と
インバ―タ出力電流が完全にバランスする確率は極めて
少なく、今この確率を１０-4と仮定する。この状態で、
Ａと中点間０の電圧（負荷９ｂの電圧）をＶ1 、Ｂと中
点間０との電圧Ｖ2 とする。遮断器７が閉の場合は変圧
器６の作用で となっているが、遮断器７が開となった後は、負荷９ｂ
と負荷９ｃのインピ―ダンスでＶ1 とＶ2 が決定され
る。In FIG. 2, the probability that the load current and the inverter output current seen from the A and B ends are completely balanced is extremely small, and it is assumed that this probability is 10 -4 . In this state,
The voltage between A and the midpoint 0 (the voltage of the load 9b) is V 1 , and the voltage between B and the midpoint 0 is V 2 . When the circuit breaker 7 is closed, the action of the transformer 6 However, after the circuit breaker 7 is opened, the load 9b
V 1 and V 2 are determined by the impedance of the load 9c.
【００２０】このためアイランディング時Ｖ1 ＋Ｖ2 は
正常値が保たれている場合でもＶ1−Ｖ2 を見るとＶ1
−Ｖ2 ＝０となる確率は９ｂと９ｃの負荷が無効電力を
含めてバランスしていることが必要であり、この確率は
極めて低い。[0020] For this reason eye landing at the V 1 + V 2 see the V 1 -V 2 even if the normal value is maintained when the V 1
The probability of −V 2 = 0 requires that the loads of 9b and 9c are balanced including the reactive power, and this probability is extremely low.
【００２１】さらにＶ1 −Ｖ2 ＝０となるためには高調
波を含めて負荷インピ―ダンスが一致する必要があるの
でこれらの条件を満足する確率はアイランディングが成
立する確率とほぼ同じ程度以上と考えられる。Further, in order for V 1 -V 2 = 0, the load impedances including the harmonics must match, so the probability of satisfying these conditions is about the same as the probability of the eye landing being established. It is thought that it is above.
【００２２】この様子を図３に示す。 （ａ）は負荷インピ―ダンスが高調波，力率を含めて一
致している場合 （ｂ）は負荷の力率のみが異る場合 （ｃ）は負荷の有効電力のみが異る場合 （ｄ）は高調波分のみが異る場合（負荷の電流波形のみ
が異る場合） を示す。This state is shown in FIG. (A) When the load impedances match including harmonics and power factor (b) When the power factor of the load is different (c) When the effective power of the load is different (d) ) Indicates that only the harmonic components are different (only the load current waveform is different).
【００２３】（ａ）以外はＶ1 −Ｖ2 ＞０となり異常が
検出できる。このような検出法を取ればアイランディン
グ時に となる確率は１０-4×１０-4＝１０-8程度となり実用上
考える必要がない確率となる。Except for (a), V 1 -V 2 > 0 and an abnormality can be detected. If such a detection method is used, at the time of landing The probability of becoming is about 10 −4 × 10 −4 = 10 −8, which is a probability that need not be considered in practice.
【００２４】図１では、この原理によりＶ1 −Ｖ2 を差
電圧検出回路22により求め、この値がレベル検出器23で
設定したレベル以上になると、時間函数発生回路24によ
り時間的に変化する（例えば時間とともに低下、又はゆ
るやかに振動する）信号を出し掛算回路25によりＶ11と
掛算することによりインバ―タ出力電流を変化させると
負荷とのバランスが失われ配電線の電圧や周波数がすみ
やかに変化し、電圧リレ―や周波数リレ―により異常を
検出してインバ―タを停止させる。In FIG. 1, V 1 -V 2 is obtained by the difference voltage detection circuit 22 according to this principle, and when this value exceeds the level set by the level detector 23, it changes temporally by the time function generation circuit 24. When the inverter output current is changed by outputting a signal (for example, it decreases or oscillates slowly with time) by the multiplication circuit 25 and V 11 , the balance with the load is lost and the voltage and frequency of the distribution line are prompt. Changes to, and an abnormality is detected by the voltage relay or frequency relay and the inverter is stopped.
【００２５】本実施例によれば、アイランディング検出
を確実にすることができる。この方法は極めて容易で経
済的であるがアイランディング検出の確率が実用上１と
考えることがきる極めて有効な方法である。According to this embodiment, it is possible to ensure the eye landing detection. This method is extremely easy and economical, but it is an extremely effective method that can be considered to have a probability of eyelanding detection of 1 in practice.
【００２６】なお図１ではレベル検出器が異常と判定し
た後時間函数回路24により時間的にインバ―タ出力電流
を変化させているが、この変化は段階的変化や傾斜変化
の他にゆらぎの変化を導入してもよい。同じ制御方式に
すればゆらぎの開始時間も一致するので多数台のインバ
―タが同期して変化するので効果を打ち消すことはな
い。In FIG. 1, the inverter output current is temporally changed by the time function circuit 24 after the level detector determines that it is abnormal, but this change is not only a step change or a slope change but also a fluctuation. Changes may be introduced. If the same control method is used, the start times of the fluctuations also coincide, and a large number of inverters change in synchronism, so the effect cannot be canceled.
【００２７】また、レベル検出器23の出力で即インバ―
タを停止し、系統からインバ―タを解列することも可能
である。図１に示した制御や演算，アイランディング検
出回路はマイクロコンピュ―タを使うことにより比較的
容易に実現できることは説明するまでもない。Ｖ1 ，Ｖ
2 の電位値，位相差，高調波分を別々に検出比較するこ
とも可能である。また、差電圧の状態（大きさ，調波
分，位相）が変化したことを検出することもマイクロコ
ンピュ―タでは容易に可能となる。Further, the output of the level detector 23 immediately
It is also possible to stop the inverter and disconnect the inverter from the grid. It goes without saying that the control, calculation, and islanding detection circuit shown in FIG. 1 can be realized relatively easily by using a microcomputer. V 1 , V
It is also possible to detect and compare the potential value of 2 , the phase difference, and the harmonic component separately. Further, it is possible for the microcomputer to easily detect that the state of the difference voltage (magnitude, harmonic component, phase) has changed.
【００２８】また図４に示すように、インバ―タが１線
とア―ス間即ち１００Ｖ回路に接続されている場合は電
圧リレ―や周波数リレ―が接続されていない他の２線間
の電圧からＶ1 −Ｖ2 ＝ｋを求めこのｋの値が一定値以
上の場合異常と判別できることは勿論であり、変圧器の
巻数比が異る場合はその係数を考慮すれば同様な方法が
採用できることは説明するまでもない。Further, as shown in FIG. 4, when the inverter is connected between one wire and the ground, that is, when the voltage relay or frequency relay is not connected, it is connected between the other two wires. Of course, it is possible to determine V 1 -V 2 = k from the voltage and to determine that the value of k is abnormal when the value of k is a certain value or more. It goes without saying that it can be adopted.
【００２９】[0029]
【発明の効果】以上説明したように本発明によれば、イ
ンバ―タが接続されている線間以外の線間電圧の理論電
圧と位相の差，高調波差を検出する回路を追加すること
によりアイランディング検出確度を著しく改善し、実用
上全く問題とする必要がない確実さでアイランディング
時インバ―タを配電系統から解列することができる系統
連系保護装置を提供することができる。As described above, according to the present invention, a circuit for detecting the difference between the theoretical voltage and the phase of the line voltage other than the line to which the inverter is connected and the phase difference and the harmonic difference is added. Thus, it is possible to provide a grid interconnection protection device capable of significantly improving the accuracy of eye landing detection and disconnecting the inverter at the time of landing from the power distribution system with certainty that does not pose any problem in practical use.
【図１】本発明の実施例FIG. 1 Example of the present invention
【図２】上記実施例の動作を説明する図FIG. 2 is a diagram for explaining the operation of the above embodiment.
【図３】上記実施例の動作を説明する図FIG. 3 is a diagram for explaining the operation of the above embodiment.
【図４】本発明の他の実施例FIG. 4 is another embodiment of the present invention.
【図５】従来の実施例FIG. 5 Conventional Example
１…直流電源 ２…インバ―タブリッジ ３…リアクト
ル ４…コンデンサ ５…電流検出器 ６…変圧器 ７…遮断器 ８…交流電
源 ９…負荷 10…電圧基準 11…増幅器 12…電流基準回路 13…増
幅器 14…ＰＷＭ回路 15…駆動回路 16…バンドパスフィル
タ 17…電圧リレ― 18…周波数リレ― 19…異常検出回路 20…高周波検出
回路 21…ゆらぎ回路 22…差電圧検出回路 23…レベル検出
回路 24…時間函数回路 25…掛算回路1 ... DC power supply 2 ... Inverter bridge 3 ... Reactor 4 ... Capacitor 5 ... Current detector 6 ... Transformer 7 ... Circuit breaker 8 ... AC power supply 9 ... Load 10 ... Voltage reference 11 ... Amplifier 12 ... Current reference circuit 13 ... Amplifier 14 ... PWM circuit 15 ... Drive circuit 16 ... Band pass filter 17 ... Voltage relay 18 ... Frequency relay 19 ... Abnormality detection circuit 20 ... High frequency detection circuit 21 ... Fluctuation circuit 22 ... Difference voltage detection circuit 23 ... Level detection circuit 24 ... Time function circuit 25 ... Multiplication circuit
Claims (2)
の交流系統へ連係するインバ―タを備えた装置におい
て、前記単相３線式の２つの線間電圧を比較して異常状
態を検出し、前記インバ―タの運転を停止させる手段を
設けたことを特徴とする系統連系保護装置。1. An apparatus provided with an inverter for converting direct-current power into alternating-current power and linking it to a single-phase three-wire type alternating current system, compares the two line voltages of the single-phase three-wire type, and is abnormal. A system interconnection protection device comprising means for detecting a state and stopping the operation of the inverter.
いて、前記単相３線式の２つの線間電圧を比較して異常
状態を検出したとき、前記インバ―タの無効電力を含む
出力電力を変動させ、電圧異常あるいは周波数異常を検
出して前記インバ―タの運転を停止させることを特徴と
する系統連系保護装置。2. The system interconnection protection device according to claim 1, wherein when an abnormal state is detected by comparing two line voltages of the single-phase three-wire system, the reactive power of the inverter is included. A system interconnection protection device characterized in that the output power is varied to detect a voltage abnormality or a frequency abnormality to stop the operation of the inverter.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10630893A JP3180991B2 (en) | 1993-05-07 | 1993-05-07 | Grid connection protection device |
| AU41405/93A AU655889B2 (en) | 1992-06-24 | 1993-06-22 | Inverter protection device |
| EP93304911A EP0576271B1 (en) | 1992-06-24 | 1993-06-23 | Inverter protection device |
| DE69320425T DE69320425T2 (en) | 1992-06-24 | 1993-06-23 | Inverter protection device |
| KR1019930011588A KR0142026B1 (en) | 1992-06-24 | 1993-06-24 | Inverter protection device |
| US08/080,790 US5493485A (en) | 1992-06-24 | 1993-06-24 | Protection device for stopping operation of an inverter |
| CN93109448A CN1036036C (en) | 1992-06-24 | 1993-06-24 | Inverter protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10630893A JP3180991B2 (en) | 1993-05-07 | 1993-05-07 | Grid connection protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06327258A true JPH06327258A (en) | 1994-11-25 |
| JP3180991B2 JP3180991B2 (en) | 2001-07-03 |
Family
ID=14430372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10630893A Expired - Fee Related JP3180991B2 (en) | 1992-06-24 | 1993-05-07 | Grid connection protection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3180991B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5627737A (en) * | 1993-09-13 | 1997-05-06 | Sanyo Electric Co., Ltd. | Power inverter for use in system interconnection |
| US7045913B2 (en) | 2002-06-18 | 2006-05-16 | Ingersoll Rand Energy Systems | Microturbine engine system |
| US7161257B2 (en) | 2004-03-08 | 2007-01-09 | Ingersoll-Rand Energy Systems, Inc. | Active anti-islanding system and method |
| JP2008259295A (en) * | 2007-04-04 | 2008-10-23 | Sharp Corp | System-interconnected inverter |
| JP2013093949A (en) * | 2011-10-25 | 2013-05-16 | Toshiba Mitsubishi-Electric Industrial System Corp | Power conversion apparatus |
-
1993
- 1993-05-07 JP JP10630893A patent/JP3180991B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5627737A (en) * | 1993-09-13 | 1997-05-06 | Sanyo Electric Co., Ltd. | Power inverter for use in system interconnection |
| US7045913B2 (en) | 2002-06-18 | 2006-05-16 | Ingersoll Rand Energy Systems | Microturbine engine system |
| US7161257B2 (en) | 2004-03-08 | 2007-01-09 | Ingersoll-Rand Energy Systems, Inc. | Active anti-islanding system and method |
| US7365444B2 (en) | 2004-03-08 | 2008-04-29 | Southern California Gas Company | Active anti-islanding system and method |
| JP2008259295A (en) * | 2007-04-04 | 2008-10-23 | Sharp Corp | System-interconnected inverter |
| JP2013093949A (en) * | 2011-10-25 | 2013-05-16 | Toshiba Mitsubishi-Electric Industrial System Corp | Power conversion apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3180991B2 (en) | 2001-07-03 |
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