A modern self-defined extinction advance angle controller for CCC based Hybrid HVDC systems

HVDC systems are attractive alternatives to increase the transmittable power. Hybrid HVDC systems are being suggested in particular for wind power evacuation applications. This paper recommends the modern self-defined extinction advance angle controller for Hybrid HVDC systems and also investigates its suitability under various operating conditions. The proposed controller employs a simple device level measurement of extinction advance angle (γ). A Hybrid HVDC system with Voltage Source Converter (VSC) at the rectifier and Capacitor Commutated Converter (CCC) at the inverter end is adopted for analysis in this paper. The proposed controller is dedicated to the receiving end converter operated in inverter mode and the sending end converter operated in rectifier mode is supplemented with the standard CIGRE controller. The performance of the proposed controller has been investigated under different operating conditions including post fault recovery. Also a fault mitigation technique is attempted for a DC link to ground fault and the robustness of the controller has been validated. PSCAD/EMTDC simulation software has been used.