Without the ability to store energy, renewable energy sources (wind and solar PV) produce intermittent power. This intermittency can cause power instability in the connected grid. Power instability could adversely impact other connected power sources.
In summary, grid power instability is a major concern.
Hope this helps answer your question.
Professor Yehia Khalil, Yale University, USA
Fellow of the University of Oxford, UK
Hi
The main factor that affect the grid voltage is the reactive power while the system frequency is always related to the active power balance between the generation and demand.
I have read very good book about that. You can find it here;
http://www.springer.com/gb/book/9783319072777
Also, there is a very famous book for the author P.Kundur (public online)
''Power system stability and control''
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