Abstract
Renewable energy power plants (REPPs) offer unique fault characteristics that are greatly influenced by the power converters. This might cause malfunction of the traditional relays. The inverter-interfaced REPPs are considered in this paper and their influences to the current differential protection configured on the transmission line are analyzed in detail. Firstly, fault current features of the inverter-interfaced renewable energy generators (IIREGs) are analyzed considering typical controls. Then the operation performance of line current differential protection is analyzed considering different fault types and capacity of IIREPPs. It is revealed that the angular difference of double-ended fault current will be larger than 90° under phase-to-phase fault and the line current differential protection will refuse to operate for the small scale REPPs. Simulations on RTDS verify the results. The findings can be used for protection configuration of transmission line connected to different capacity of IIREPP.
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