Control systems, methods, and software for keeping power converters within operating limits during disturbances
First Claim
1. A control system for a controlled current source that receives DC power as an energy input and provides an AC power output for delivery to an AC power network, the AC power output having an output voltage, the control system comprising:
- a voltage signal device, connectable to the controlled current source, configured to provide a voltage feedback signal representing voltage in the AC power output from the controlled current source;
an active feedforward loop electrically connected to the voltage signal device, the active feedforward loop configured to generate an active feedforward voltage signal based on the voltage feedback signal; and
an impedance current regulator configured to generate an impedance current signal as a function of an error between the voltage feedback signal and the active feedforward voltage signal.
3 Assignments
0 Petitions
Accused Products
Abstract
Feedback-type control systems for power converters that assist the power converters in staying within operational limited during disturbances. In some embodiments, each control system includes an impedance current regulator controlled as a function of an error between a measured feedback voltage signal representing the output of the power converter and an active feedforward voltage signal. In some multiphase embodiments, the impedance current regulator includes a gain that is adjusted as a function of the level of phase imbalance among the multiple phases. In some multiphase embodiments, a total current limit is determined as a function of the level of phase imbalance among the multiple phases. Corresponding feedback control methods and software, as well as power converter systems and AC network systems incorporating such feedback control systems, are also disclosed.
22 Citations
30 Claims
-
1. A control system for a controlled current source that receives DC power as an energy input and provides an AC power output for delivery to an AC power network, the AC power output having an output voltage, the control system comprising:
-
a voltage signal device, connectable to the controlled current source, configured to provide a voltage feedback signal representing voltage in the AC power output from the controlled current source; an active feedforward loop electrically connected to the voltage signal device, the active feedforward loop configured to generate an active feedforward voltage signal based on the voltage feedback signal; and an impedance current regulator configured to generate an impedance current signal as a function of an error between the voltage feedback signal and the active feedforward voltage signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A method of controlling a controlled current source that receives DC power as an energy input and provides an AC power output for delivery to an AC power network, the AC power output having an output voltage, the method comprising:
-
receiving a voltage feedback signal representing voltage in the AC power output from the controlled current source; generating an active feedforward voltage signal based on the voltage feedback signal; determining an error between the voltage feedback signal and the active feedforward voltage signal; generating an impedance current signal as a function of the error between the voltage feedback signal and the active feedforward voltage signal; and controlling the controlled current source as a function of the impedance current signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
-
Specification