System and method for implementing a remedial electrical short

摘要

A method of implementing a remedial short in a rotating polyphase electric machine (EM) includes detecting a fault condition; and initially commanding a power inverter module (PIM) into an electrically-open state. Once in an open state, a controller may determine a phase angle of a current generated by the rotating EM, and may control the PIM to apply a voltage to the EM that is out-of-phase from the determined phase angle of the generated current. The magnitude of the applied voltage signal may ramped from a first voltage to zero over a period of time; whereafter the PIM may be commanded to electrically couple all of the electrical windings of the EM to each other.

主权项

1. A system comprising:
a DC electrical bus; an AC electrical bus; a permanent magnet synchronous electric machine (EM) having a plurality of electrical phase windings disposed on the AC electrical bus, the EM being operative to generate an AC electrical signal from a rotational motion; a power inverter module (PIM) electrically disposed between the DC electrical bus and the AC electrical bus, the PIM being transitionable between an open-state, a controllable switching-state, and a polyphase short-state; and a controller in communication with the PIM, the controller configured to:
command the PIM into the open-state;determine a phase angle of a current of the generated AC electrical signal;command the PIM into the controllable switching-state;control the PIM to apply a voltage to the EM that is out-of-phase from the determined phase angle of the generated current;ramp a magnitude of the applied voltage from a maximum voltage to zero; andcommand the PIM into the polyphase short-state.