| Abstract |
Poor voltage regulation is one of the major drawbacks of an isolated self-excited induction generator. The terminal voltage may increase considerably due to a small increase in speed. This paper introduces, a new technique for induction generator speed control is used. D-C to D-C chopper is used for controlling a d-c motor input voltage, coupled to the shaft of Induction Generator. A simple converter with only two legs is required, each leg consists of IGBT and fast recovery diode, one leg connected in series with armature of d-c motor while the other connected in parallel with d-c motor terminal. Simulation and Experimental study of different conditions of d-c to d-c chopper fed d-c motor are obtained, and hence braking terminal voltage of Induction Generator is carried. All parts (voltage and current) of the proposed system are investigated. Closed loop control of terminal voltage of a stand-alone induction generator is presented by using bang-bang control of d-c to d-c chopper, and hence brakeing of Induction Generator is achieved. A good agreement between simulation and experimental results are found. |
