The disadvantages of a PV System annex inverter for the distribution grid are much discussed. Their irregular supply and harmonic currents are challenges for the grid of the future. But feeding the grid via inverters has some advantages as well, namely for grid safety. In contrast to rotating generators, inverters will not deliver a multiple of their rated current in case of a grid fault. They will produce less than 20% of the fault current compared to a synchronous generator. Furthermore, their high switching frequency enables them to make control decisions in a fraction of a cycle. And failures of protection or control features in inverters will result in an inoperative inverter, rather than in an appliance that continues operating without protection.
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