Analysis of Large Offshore Wind Power Convergent Grid-Connection Mode and Study of Three-Terminal Flexible Control Strategy

At present, the global demand for clean energy is increasing, and the installed capacity of offshore wind power is also increasing year by year. Large-scale offshore wind power system became the future development direction. First of all, the author summarizes and compares the offshore gathering system and analyzes the prospect and advantages of offshore dc wind farm. Furthermore, the topological structure of offshore dc wind farm is reviewed in detail and its advantages and disadvantages are summarized. On this basis, the mathematical model of the three-terminal flexible system based on the grid-connected VSC-HVDC is established, and the double-closed-loop control strategy of active and reactive power decoupling and the master-slave control at the system level are analyzed. Finally, the corresponding simulation model is built on the MATLAB/simulink platform for simulation, the results show that the control strategy can achieve flexible decoupling control of wind power, and the power step disturbance has good dynamic response speed and robustness.