Parallel Operation of Aircraft Alternators Using Electronic Frequency Changers

This paper reports initial work on an electronic method for operating several main aircraft engine driven alternators in parallel to supply the electrical loads of an airplane. This would make unnecessary any mechanical constant speed drive for each generator. An electronic frequency changer is associated with each alternator and the outputs of the changers paralleled at the load bus. Synchronization, load division, and provision for reactive power are discussed, and test data obtained from two 4-kva units are presented.