Patent ID: 11873112
Assignee: SAFRAN
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC B  H | IPC B  H

Claim 5:
6. A device (72) for synchronizing a principal electrical energy source (1) and an auxiliary electrical energy source (3), said sources being coupled on an electrical network feeding at least one electrical load (2) of an aircraft,
said principal electrical energy source (1) comprising a multistage generator set (6), said multistage generator set (6) comprising:
a primary stage (6a) comprising a permanent-magnet generator,
a secondary stage (6b) comprising an exciter, and
a tertiary stage (6c) comprising a principal generator connected to said electrical load;

said auxiliary electrical energy source being connected to the electrical load in parallel with the principal electrical energy source by a converter and configured to supply the electrical load (2) with an additional electrical power supplementing the principal electrical energy source;
said synchronization device (72) being configured to:
measure an electrical voltage generated by the permanent-magnet generator of the primary stage (6a) of the multistage generator set (6),
measure an electrical frequency at terminals of the converter;
compare the measured electrical frequency to a frequency threshold or compare a level of use of the principal electrical energy source deduced from the measured electrical frequency to an over-use threshold;
when the measured electrical frequency is above the frequency threshold or when the level of use of the principal electrical energy source is below the over-use threshold, control the converter for the electrical load to be supplied with only the principal electrical power; and
when the measured electrical frequency reaches the frequency threshold or when the level of use of the principal electrical energy source reaches the over-use threshold, control the converter for the electrical load to be supplied with both the principal electrical power and the additional electrical power and for an electrical voltage of the additional electrical power to be slaved to the frequency and phase characteristics of the measured electrical voltage.