Variable Speed Generator Market – Global Industry Size, Share, Trends, Opportunity, and Forecast, Segmented By Type (Variable Speed-Self Excited Induction Generator, Doubly Fed Induction Generator, Wound Rotor Induction Generator and Permanent Magnet Synchronous Generator), By Rating Type (Up to 100 KVA, 100 KVA-1 MVA, 1 MVA-25MVA and Above 25 MVA), By Technology (Power Electronics-based Variable