Investigations on modern self-defined controller for hybrid HVDC systems

This paper proposes a modern self-defined extinction advance angle controller and investigates its suitability for Hybrid HVDC systems. The self-defined controller suggests a new method of measuring extinction advance angle γ which helps to maintain the preferred value. The proposed controller is dedicated for the receiving end converter operated in inverter mode and hence a Hybrid HVDC system with VSC at the rectifier and LCC at the inverter have been adopted in this paper. The performance of the proposed controller has been investigated under different operating conditions including post fault recovery. Also a fault mitigation technique has been attempted for a link to ground fault and the robustness of the controller has been confirmed in conjunction with the fault mitigation technique. PSCAD/EMTDC simulation software has been used for validating the proposed controller and the standard CIGRE benchmark system has been used for evaluating the proposed controller in this paper.