A power electronic based DR (distributed resource e.g., a UPS
(uninterrupted power supply), Fuel Cell or Microturbine) is controlled to
emulate a voltage source behind an impedance and behave as a power system
stabilizer. The impedance in the DR is emulated and an estimate of
impedance at the power/electronic interface is derived and applied to the
control of the DR in a manner wherein the power and voltage swings on
systems (loads) that otherwise would have difficulty with dynamic loads,
are stabilized. Damping and synchronizing power are provided measuring
only voltage, current and frequency at the interface between the DR and
the load. The DR may include some energy storage.