An other advantage of the full scale converter is its behaviour when the grid voltage changes very fast.
網(wǎng)側(cè)變流器的另外一個(gè)優(yōu)點(diǎn)是：當(dāng)網(wǎng)格電壓變化非?？鞎r(shí)，變流器的特性。

Double feed systems work well if the grid voltage and frequency is very stable. If you use a double feed system the current of the generator side IGBT increases to 4 times of the nominal current, when the grid voltage is changing suddenly from 100% to 60%. Also the torque at the generator shaft increases to 4 times of the nominal torque which can damage the gearbox. If you do not want to take very big IGBTs you have to use a crowbar at the generator side to protect the system against over voltage.
當(dāng)網(wǎng)格電壓和頻率很穩(wěn)定時(shí)，雙饋系統(tǒng)工作的很好。在使用雙饋系統(tǒng)時(shí)，當(dāng)網(wǎng)格電壓突然從100％變到60％時(shí)，發(fā)電側(cè)IGBT電流就會(huì)增加到額定電流的4倍，同時(shí)發(fā)電機(jī)軸的力矩也會(huì)增加到額定力矩的4倍，這時(shí)就會(huì)毀壞齒輪箱。如果你不想用非常大的IGBT的話，又想使整個(gè)系統(tǒng)在過(guò)壓時(shí)不被破壞，那么你不得不在發(fā)電側(cè)用一個(gè)短路器。
We must consider the life time for IGBTs in Windmill application. High load cycle
Capability is necessary to improve the reliability of windmill drives. SKiiP technology (no copper base plate, pressure technology) is very popular for this application. Semikron is dominating in this field.
在風(fēng)力發(fā)電應(yīng)用中，我們必須考慮IGBT的使用壽命。為了提高風(fēng)力發(fā)電驅(qū)動(dòng)器的可靠性，IGBT必須具備高負(fù)載周期的能力。在此應(yīng)用中，SKIIP（沒(méi)有銅基板，壓接式技術(shù)）技術(shù)非常風(fēng)行，在風(fēng)力發(fā)電行業(yè)里面，賽米控占據(jù)主導(dǎo)地位。

In the following table we try to compare the systems :
在下表中，我們來(lái)比較兩個(gè)系統(tǒng)：