US 12,188,441 B2
Direct current power plant
Andrew A. Schnellinger, Merrimack, NH (US); James R. Lowell, Goffstown, NH (US); Bryan A. Finseth, Newbury, NH (US); Christopher L Barber, Exeter, RI (US); Jason M. Sachs, Chandler, AZ (US); Donald J. Lucas, Windham, NH (US); Shannon Prescott, Loudon, NH (US); Jeffrey W. Kite, Manchester, NH (US); Andras K. Fekete, Fremont, NH (US); and Douglas R. Adams, Pepperell, MA (US)
Assigned to DEKA Products Limited Partnership, Manchester, NH (US)
Filed by DEKA Products Limited Partnership, Manchester, NH (US)
Filed on Aug. 9, 2023, as Appl. No. 18/446,922.
Application 17/748,458 is a division of application No. 16/990,140, filed on Aug. 11, 2020, granted, now 11,339,758.
Application 16/990,140 is a division of application No. 16/243,846, filed on Jan. 9, 2019, granted, now 10,760,541, issued on Sep. 1, 2020.
Application 16/243,846 is a division of application No. 15/182,147, filed on Jun. 14, 2016, granted, now 10,215,146, issued on Feb. 26, 2019.
Application 18/446,922 is a continuation of application No. 17/748,458, filed on May 19, 2022, granted, now 11,859,589.
Claims priority of provisional application 62/188,240, filed on Jul. 2, 2015.
Claims priority of provisional application 62/182,182, filed on Jun. 19, 2015.
Prior Publication US 2023/0392570 A1, Dec. 7, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. F02N 11/08 (2006.01); F02G 1/043 (2006.01); F24D 11/00 (2022.01); H02J 1/10 (2006.01)
CPC F02N 11/0859 (2013.01) [F02G 1/043 (2013.01); F02N 11/0866 (2013.01); F24D 11/00 (2013.01); H02J 1/10 (2013.01); F02G 2275/40 (2013.01); F02N 2011/0885 (2013.01)] 18 Claims
OG exemplary drawing
 
1. Method of producing direct current (DC) power for an electric grid comprising:
driving a permanent magnet synchronous motor generator (PMSMG) whereby the PMSMG generator outputs alternating current (AC) power;
converting the AC power to DC power;
wherein the PMSMG and the motor drive power board control said driving;
providing the DC power to an electric grid;
receiving an angle having a waveform;
applying an increment to the angle;
generating a sine/cosine pair for the angle;
generating an inverter waveform based on the sine/cosine pair; and
computing a phase error signal based on the sine and a cosine of the grid voltage;
multiplying the sine by the voltage of the grid supply and defining a signal that contains AC and DC components wherein:
the AC component has an amplitude variation based on amplitudes of the grid supply and the inverter waveform, and having a frequency equal to twice the frequency of the grid supply when loop is locked;
the DC component has an amplitude variation based on a phase error between the grid supply and the inverter waveform;
filtering the phase error thereby eliminating a part of the AC component not relevant to control and defining filtered phase error; and
supplying the filtered phase error to the PI controller.