US 12,249,934 B2
Systems and methods for reactive power injection based flying start of synchronous machines
Anantaram Varatharajan, Cambridge, MA (US); Yebin Wang, Cambridge, MA (US); and Abraham Goldsmith, Cambridge, MA (US)
Assigned to Mitsubishi Electric Research Laboratories, Inc., Cambridge, MA (US)
Filed by Mitsubishi Electric Research Laboratories, Inc., Cambridge, MA (US)
Filed on May 12, 2023, as Appl. No. 18/196,571.
Prior Publication US 2024/0380346 A1, Nov. 14, 2024
Int. Cl. H02P 21/34 (2016.01); H02P 21/18 (2016.01)
CPC H02P 21/34 (2016.02) [H02P 21/18 (2016.02); H02P 2207/05 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A cascaded controller for controlling a kinetic three-phase synchronous machine, comprising:
a current control circuitry configured to regulate a magnitude of inrush stator current for a stator of the kinetic three-phase synchronous machine by producing a first voltage control signal causing a flow of active power in the kinetic three-phase synchronous machine,
wherein the current control circuitry is further configured to:
accept a measure of the inrush stator current; and
produce the first voltage control signal, based on the measure of the inrush stator current, and
wherein a voltage powering the kinetic three-phase synchronous machine is modulated based on the first voltage control signal such that the modulated voltage reduces a first error between the measure of the inrush stator current and a reference value of the inrush stator current, and
wherein the modulated voltage reduces a second error between an estimated value of the active power and a reference value of the active power; and
an active power control circuitry operatively coupled with the current controller circuitry and configured to produce a second voltage control signal to reduce the active power to zero, based on the first voltage control signal,
wherein the second voltage control signal controls a phase angle of the inrush stator current such that a stator current vector of the inrush stator current is oriented to align with a magnet axis of the rotor.