The attached picture shows the the type 5 of wind energy conversion system. As it can be clearly seen that the generator operates at a fixed-speed and it is directly connected to the grid.
In the following article, you will find approaches for the pitch angle based speed control of wind turbines. Fixed speed operation is mathematically possible l, but the required rate of the pitch angle might be higher than the technical limits.
https://www.researchgate.net/publication/307583892_Modeling_and_Control_of_Wind_Turbines_Including_Aerodynamics
I think it depends on whether it's easier or cheaper to perform the frequency stabilising process mechanically or electronically. Normally one would say electronically - but in this application of high power and low speed, and where the input is mechanical, then a mechanical converter might prove better.
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