Authors : Gamal M.A. Sowilam, Tamer A. Kawady and Raed A. Shalwala
Abstract: This study presents explores deeply the possibilities and benefits of interconnection of large Photo-Voltaic (PV) and wind power systems into the grid through High Voltage Direct Current (HVDC) link. The use of HVDC is usually required for transmission distance longer than 50 km. Such lines are typically used to interconnect two asynchronous networks even with different frequencies to avoid possible stability disturbances greatly. A Maximum Power Point Tracking (MPPT) techniques is utilized to control the photovoltaic system in order to obtain the maximum power from the integrated PVs. Adapting the MPPT control changes the duty ratio of the boost converter and increase (or decrease) the output DC voltage of the PV power plant. Wind systems uses the MPPT through controlling the trip-speed ratio. In this study, a HVDC link with two 12-pulse converters based on thyristor-bridges for both rectification and inversion modes, respectively. The roles of the delay and the extinction angles of both the rectifiers and inverter are explored for controlling the transmitted active power from the PV and wind power plants into the grid. Different simulation investigations are provided with a detailed modeling with the Simulink/MATLAB for evaluation purposes. These tests corroborate the efficacy of HVDC links for supporting the integration of large PV and wind power plants into electrical grids.
Gamal M.A. Sowilam, Tamer A. Kawady and Raed A. Shalwala, 2019. Visualization of Integrating Hybrid Wind-PV Systems into Power Grid Using HVDC Link. Journal of Engineering and Applied Sciences, 14: 4331-4346.