Back to results
US 2016/0105093 A1Published application
Inverter synchronization
AssigneeDanfoss Power Electronics A/S
InventorLeandro Della Flora
Life of this patent
Estimating the term…
Abstract
A method of initiating a grid-tied inverter is described, in which in-rush currents and DC overvoltage conditions are reduced or avoided. The method uses a pulse width modulator to drive the inverter under the control of a voltage feedforward signal such that the inverter output is dependent on the measured grid voltage. Then, an AC current feedback controller is enabled and the pulse width modulator is used to drive the inverter under the control of both the voltage feedforward control signal and the feedback control signal.
Claims20
A method comprising:
- enabling an AC voltage feedforward controller of a grid-tied inverter;
- setting a voltage feedforward gain of the AC voltage feedforward controller to unity and using the AC feedforward controller to generate a feedforward control signal that is a product of a measured voltage of the grid and the voltage feedforward gain;
- using a pulse width modulator to drive the inverter under the control of the feedforward control signal, such that the inverter output is dependent on the measured grid voltage;
- enabling an AC current feedback controller;
- using the AC current feedback controller to generate a feedback control signal based on a measured output current of the inverter;
- and
- using the pulse width modulator to drive the inverter under the control of both the feedforward control signal and the feedback control signal.
4 more elements
An inverter comprising:
- an AC voltage feedforward controller having a voltage feedforward gain, wherein the AC feedforward controller is used to generate a feedforward control signal that is a product of a measured voltage of the grid and the voltage feedforward gain;
- an AC current feedback controller that is configured to generate a feedback control signal based on a measured output current of the inverter;
- and
- a pulse width modulator that drives the inverter,
- wherein:
- with the AC current feedback controller disabled and the voltage feedforward gain of the AC voltage feedforward controller set to unity, the pulse width modulator drives the inverter under the control of the feedforward control signal, such that the inverter output is dependent on the measured grid voltage;
- and
- with the AC current feedback controller enabled, the pulse width modulator drives the inverter under the control of both the feedforward control signal and the feedback control signal.
5 more elements
Dependencies are inferred from the claim text.