Patent ID: 11936327
Assignee: TECOGEN INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. The system of claim 4, wherein the second controller includes:
a first proportional-integral-derivative (PID) controller that receives as an input an engine speed difference signal that corresponds to the difference between the target speed and the actual speed of the engine, the first PID controller producing a first output signal;
a second PID controller that receives as an input a DC bus voltage difference signal that corresponds to the difference between the target voltage and the actual voltage of the DC bus, the second PID controller producing a second output signal;
a current controller that receives as inputs the first and second output signals, the current controller producing first and second reference currents;
a third PID controller that receives as an input a first current difference signal that corresponds to a difference between the first reference current and the generator DC, the third PID controller producing the first duty-cycle output signal; and
a fourth PID controller that receives as an input a second current difference signal that corresponds to a difference between the second reference current and the grid DC, the fourth PID controller producing the second duty-cycle output signal.