Control of PMSG-Based Wind Turbine with Virtual Inertia

With the continuous improvement of the grid-connected capacity of wind power, a large number of wind turbine generator sets are connected to the grid through power electronic devices, which reduces the inertial support and damping capacity of the existing power system to the system frequency, and seriously threatens the stable operation of the system. Techniques such as virtual inertia and primary frequency modulation improve the grid-connected inertia and damping coefficient of the turbine by simulating the characteristics of conventional synchronous generators. This paper first introduces the mathematical model of permanent magnet synchronous generator (PMSG) and the control of speed sensorless. Then the relationship between energy balance and system frequency is analyzed, and the principle of PMSG-based wind turbine to system frequency support is improved by adding PD virtual inertia control to the power outer loop. Finally, the simulation model of MATLAB/Simulink is used to verify the support ability of the control strategy to the grid frequency.