COMPRESSOR OPERABILITY CONTROL FOR HYBRID ELECTRIC PROPULSION

A hybrid electric propulsion system (100) includes a gas turbine engine (120) having a low speed spool (30) and a high speed spool (32). The low speed spool includes a low pressure compressor (44) and turbine (46), and the high speed spool includes a high pressure compressor (52) and turbine (54). The hybrid electric propulsion system includes an electric generator (213A) configured to extract power from the low speed spool (30), an electric motor (212B) configured to augment rotational power of the high speed spool (32), and a controller (256). The controller is operable to determine (602) a target operating condition of the low pressure compressor (44) to achieve a compressor stability margin in the gas turbine engine, determine (604) a current operating condition of the low pressure compressor (44), and control (606) a power transfer between the electric generator (213A) of the low speed spool (30) and the electric motor (212B) of the high speed spool (32) to adjust the current operating condition based on the target operating condition.