Energy conversion with doubly fed machines

Abstract

The presented paper deals with doubly fed machines (DFM) operating in units that convert mechanical to electric power and vice versa. We concentrate especially on their usage in pumped storage plants which, used in the power system, can increase its stability and operating efficiency. A mathematical model of the power unit with a doubly fed machine and a cycloconverter in its rotor circuit was derived. The model includes vector control of the rotor voltage which enables us to analyse both steady and transient states.