Apparatus for supplementing commercial power subject to brownout and blackout failures

摘要

A power source for supplementing commercial ac power in cases of sustained brownouts or blackouts is achieved with an alternator connected to augment the power of a commercial ac source, a first circuit for sensing the voltage level required of the alternator and for controlling the field drive of the alternator to produce the required voltage level, a second circuit for determining the frequency and phase of the voltage generated by the alternator, and apparatus for driving the alternator at the angular frequency and spatial angle dictated by the second circuit.