Patent ID: 11859589
Assignee: DEKA PRODUCTS LIMITED PARTNERSHIP
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  H | IPC F  H

Claim 17:
18. A method for starting an engine comprising:
receiving first power from a first AC power supply;
receiving second power from a second AC power supply;
starting the engine by using the first power and a capacitor bank;
starting system control electronics by using the second power;
controlling, by the system control electronics, a power control board;
controlling, by the power control board, the engine;
providing output from the engine to a generator;
producing alternating current (AC) power by the generator;
converting the AC power to direct current (DC) power;
providing the DC power to an electric grid;
measuring a voltage and a frequency by a first digital phase locked loop when the voltage and the frequency are within a pre-selected range of tolerance;
continuously measuring phase error by a second digital phase locked loop;
referencing the measured voltage to the second digital phase locked loop; and
declaring phase lock when the phase error is less than a pre-selected value and when the measured voltage is within a pre-selected range of voltage.