Analysis and Research on Virtual Impedance Control Strategy of Grid-Forming Full-Power Wind Turbines in Weak Grid

With the rapid development of wind power industry, wind power technology has become a research hotspot. In the full-power wind power generation system, with the increase of grid-connected permeability of new energy generation, the control problem of full-power wind power converters in weak grid is becoming increasingly prominent, and grid-forming virtual synchronous generator control is the main solution to such problems. In this paper, based on the traditional virtual synchronous generator control, the virtual impedance control strategy is introduced to replace the traditional PI control strategy by improving the control structure of the converter voltage outer loop. The damping characteristics of the virtual impedance are used to suppress the power oscillation and overshoot, and the power response speed of the converter is accelerated. Finally, simulation software MATLAB/Simulink is used to verify the rationality and effectiveness of the improved strategy.