Research on Underwater High-Voltage DC Transmission Systems

This study addresses the issue of double frequency fluctuations caused by cascade converters in high-voltage DC transmission systems by designing a system that uses a 4.3kV, 50Hz three-phase AC input and ultimately outputs 220V, 50Hz AC through multiple conversions. The working principles of each functional module and control system are then described in detail, and a simulation model is established using MATLAB/Simulink software to verify the feasibility of the system. Through simulation analysis, the system is shown to have a low total harmonic distortion rate, providing a safe, high-quality, and stable power supply, thus verifying the effectiveness and superiority of the designed system.