APPARATUS FOR SUPPLYING AN ISOLATED DC LOAD FROM A VARIABLE-SPEED SELF-EXCITED INDUCTION GENERATOR

This paper describes the design and laboratory testing of a novel gene ration apparatus for supplying an isolated dc load from a self-excited induction generator operable at variable speed. The variable-speed ge nerating apparatus consists of a self-excited induction machine, a con trolled Graetz bridge rectifier, a voltage-boost converter, and a cont rol system. The induction generator supplies the rectifier. The voltag e-boost converter interfaces the variable output voltage of the rectif ier to the fixed dc voltage required for the load. The rectifier is op erated at levels of average dc current and voltage which control machi ne voltage to the rated ac voltage and which also draw the necessary p ower to supply the dc load. Performance is enhanced with respect to ea rlier apparatuses in that both the dc voltage supplied to the load and the ac voltage on the machine are simultaneously controlled to fixed reference levels over broad operating ranges of load and speed.