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Manditereza, Patrick T; Bansal, Ramesh C
IET renewable power generation, 07/2018, Volume: 12, Issue: 10Journal Article
Several issues need to be considered in the design and control of converters for converter-interfaced distributed generators (DGs). Under fault conditions, the semiconductor devices withstand ratings must not be exceeded. The converter control strategy is also required to facilitate fault ride through (FRT) capability. On the other hand, protection against fault is better served by employing control strategies that allow the converter-interfaced DGs to contribute short duration fault current sufficient to aid the detection of faults. Semiconductor devices protection and FRT capability have the same objective of limiting the magnitude of the fault current. Protection coordination in the complex DG-integrated network is difficult and may result in protection settings that are not optimal or contribute to long relay operating times that may impact FRT support. On this basis, this study proposes the de-coupling of the protection solution from FRT and semiconductor device considerations. This study critically reviews various strategies proposed in the literature for the protection of the DG-integrated distribution system and develops an argument that aims to influence a paradigm shift towards voltage-based protection that may see protection design decoupled from inverter design and control, since fault current contribution may not be required to achieve effective protection.
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