Most VFD/PLC manufacturers train customers on their equipment. If you work in a factory or plant that has this equipment, it would be easy to get some free training.
I personally have never seen any state or local certifications for this part of our industry. Not like getting a JW or masters card. Only little certificates from the training the manufacturers provide. Most anyone who is proficient with these controls usually learned about them through their jobs, and the training provided in those jobs. Where in GA. are you? And what type of electrical work do you do? What brand of PLC/VFD do you work with?
PS. Check these web sites for training schedules.
www.baldor.com
www.wegelectric.com
www.abbcontrols.com
www.tecowestinghouse.com