Say I have a 100 kW synchronous motor in a building driving a pump/fan etc as part of an HVAC system.
1 - if I drive the shaft of the motor at 100 KW (from somewhere else), then the load on the motor will be zero and the motor will take no energy (to 1st order)?
2 - if I drive the shaft of the motor at 200 kW then it acts as a 100KW generator? This is what I understand from synchronous motors. If my electrical demand on that circuit is 100kW (from other things) then is my electricity drawn from the grid zero?
3 - If I have 100 kW other demand on this subsystem, and drive the synch motor shaft at 300kW (from elsewhere) then I have a 100kW 'extra' - does this get 'exported' to the grid? Am I missing something?
Thanks in advance