It is completely normal. My son was a champion fit thrower at that age too, but he grew out of it. It gets easier as he learns new words. It comes with the frustration of being able to understand more than they can communicate, plus the inability to control impulses. Some people have taught their baby to sign for simple things, like hunger, thirst and tired. We never did, but I can tell you from personal experience that 90 percent of his fits were because he was hungry, thristy or tired, and was too busy to stop playing until it was nearly a crisis with his body, then the fit. We learned to have a little healthy nibbles around between meals. When all else failed, taking him for a ride in the car usually called him down.
I have a funney story about my son's fit throwing. We have a tile floor in our kitchen. The first time our son threw a fit in there he head butted the floor - you can imagine what happened, he stop throwing the fit and started crying with pain and had a big knot on his head, but nothing a little TLC and ice pack could not solve. The very next time he threw a fit in the kitchen, he went to head butt the floor again, and instead of hitting it full force---he gently tapped the tile floor with his forehead...so there you have it. He learned quickly from his mistake!