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Karakteristični primeri koordinacije izolacije u energetskim pretvaračima
Characteristic example of insulation coordination in power converters
Projekat: Ministarstvo prosvete, nauke i tehnološkog razvoja Republike Srbije (institucija: Univerzitet u Beogradu, Institut 'Mihajlo Pupin') (MPNTR - 451-03-68/2020-14/200034)
Sažetak
Uređaji i moduli energetske elektronike koji se najčešće koriste u sistemima napajanja različite namene, industrijskim regulisanim pogonima i pretvaračkim sistemima u oblasti distribuiranih izvora energije u odnosu na pasivne komponente imaju veoma slabu sposobnost izdržavanja prenapona. Ovi prenaponi mogu biti različitog porekla, a u najvećem broju slučajeva su to tranzijentni prenaponi, koji čak i kada su relativno niskih nivoa, mogu dovesti do oštećenja pomenutih uređaja energetske elektronike, odnosno elemenata energetskih pretvarača. Iz ovih razloga veoma je bitno sprovesti niz mera u cilju obezbeđenja izolacionih svojstava celokupnog sistema, a takođe i samog energetskog pretvarača kao dela tog sistema. U ovom radu se na osnovu usvojenih važećih standarda i relevantne literature iz date oblasti daju karakteristični primeri koordinacije izolacije za dva reprezentativna tipa energetskih pretvarača: industrijski frekventni regulatori i fotonaponski invertori koji se koriste u solarnim "on-grid" napojnim sistemima.
Abstract
Power electronics devices and modules that are most often used in power supply systems when compared to the passive components usually exhibit a very poor ability to withstand surge voltages. These surge voltages can be of different origins, and in most cases are transient surges. The recorded surge voltages even at low levels can lead to a damage of the mentioned power electronics devices or power converter components. Consequently, it is very important to implement a number of measures to increase the insulation level of the entire system. In this paper the two representative examples of insulation coordination are elaborated: i) an industrial AC drive and ii) photovoltaic inverter used in solar grid-connected power systems.
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Reference
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