Click on the link below to access an article by Benjamin Kroposki, posted on 20 Oct 2016 on the IEEE Spectrum website that provides a simple explanation of “synchronous" and "non-synchronous” generators and how a new technique called virtual oscillator control can help solar inverters stabilize the power grid:

http://spectrum.ieee.org/energy/renewables/can-smarter-solar-inverters-save-the-grid

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AuthorRay Dennis