Abstract
The Voltage Source Converter based HVDC (VSC-HVDC) transmission system involving overhead lines lack the inherent ability to overcome severe over currents and over voltages during dc line fault conditions. Presently, the fast acting commercial HVDC circuit breakers are uneconomical and are in prototype status. Due to this, the VSC-HVDC system finds applications in back to back and underground cable transmissions where the occurrence of dc faults is almost zero. In this context, the present paper analyses the combined application of Superconducting Fault Current Limiter (SCFCL) along with Chopper Controlled Resistors (CCR) to overcome and recover from the effects of dc line faults. The resistive SCFCL is modeled in MATLAB and the VSC-HVDC system is analyzed using PSCAD/EMTDC environment. The simulation results show that during dc line faults, the SCFCL is effective in limiting the over currents and the CCR overcomes the over voltages. The combined simulated protection strategy restores the complete VSC-HVDC system without restarting of the dc link.
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