Study on Variable-coefficient Virtual Inertia Control of Directly-driven Permanent Magnet Synchronous Generator
Conventional PD virtual inertia control can effectively avoid the problem of frequency quadratic drop in the absence of inertia.But its fixed inertia coefficient may lead to over-or under-inertia in inertia response under varying wind speed,resulting in changes in output active power delay of wind turbines,impact on frequency change,and unsatisfactory inertia response utility.In this paper,based on the construction of the PD virtual inertia control model,the influence of rotor kinetic energy and wind speed changes on the adjustment of virtual inertia is comprehensively considered.By pre-calculating the forward rotation energy corresponding to the predicted wind speed of the next moment with the current wind speed,the variable differential coefficient satisfying the system is obtained,and the auxiliary power of the wind turbine in the traditional control method is optimized to match real-time inertia effect of the system frequency adjustment with higher flexibility,while avoiding mechanical and fixed full inertia support in traditional control methods and reducing frequency regulation pressure of the unit.The effectiveness of the proposed strategy is verified through simulation.
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