Abstract
The most wind turbines/PV inverters achieve maximum power tracking through converter control, which results in unable to respond to grid frequency changes, unable to help the grid reduce system frequency change rate, and unable to provide active power backup for power systems and increasing the system's frequency control intensity. Based on the fast control of the inverter, the inertia support and primary frequency control to the wind turbine/PV inverter can be realized through the design of the frequency response control. The grid code has been elaborated and implemented in European countries. However, one question is: Why do we need a frequency regulation of wind power generationƒ This paper analyzes the typical cases of renewable energy participation in system frequency control in Europe, and studies the needs of domestic and international renewable energy power to participate in system frequency control. And the frequency control requirements of the Portuguese power grid for grid-connected wind power are given.
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