US 11,855,459 B2
Method for three-phase supply into an alternating voltage network, and three-phase inverter
Alexander Unru, Baunatal (DE); Moritz Welker, Zierenberg (DE); Neidhardt Bechtel, Kassel (DE); and Sybille Pape, Vellmar (DE)
Assigned to SMA Solar Technology AG, Niestetal (DE)
Filed by SMA Solar Technology AG, Niestetal (DE)
Filed on Sep. 13, 2021, as Appl. No. 17/473,150.
Application 17/473,150 is a continuation of application No. PCT/EP2020/056876, filed on Mar. 13, 2020.
Claims priority of application No. 10 2019 106 583.6 (DE), filed on Mar. 14, 2019.
Prior Publication US 2021/0408793 A1, Dec. 30, 2021
Int. Cl. H02M 7/5387 (2007.01); H02J 3/26 (2006.01)
CPC H02J 3/26 (2013.01) [H02M 7/53875 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for three-phase infeed of electrical power from a DC source into a three-phase AC grid by means of an inverter, wherein the inverter has a regulation circuit, and wherein the regulation circuit comprises a regulator circuit and a multiplier circuit, comprising:
measuring phase-specific grid voltages of the three-phase AC grid;
determining a grid frequency from the measured phase-specific grid voltages;
generating phase-specific sinusoidal voltage reference values using the regulator circuit from the measured phase-specific grid voltages and the determined grid frequency, wherein the phase-specific sinusoidal voltage reference values have phase-specific amplitudes and a common frequency corresponding to the respective amplitudes and frequency of the measured phase-specific grid voltages of individual phases of the three-phase AC grid,
generating phase-specific target current values using the multiplier circuit by forming products of phase-specific predetermined target current amplitude values and the phase-specific sinusoidal voltage reference values and dividing the formed products by respective phases of grid voltage amplitudes, and
using the phase-specific target current values for driving power switches of the inverter.