US 11,722,003 B2
Power converter and method for operating a power converter
Claus Allert, Kaufungen (DE); Aleksandra-Sasa Bukvic-Schaefer, Kassel (DE); Harald Christian Benz, Flensburg (DE); and Patrick Blair Reynolds, Charlotte, NC (US)
Assigned to SMA Solar Technology AG, Niestetal (DE)
Filed by SMA Solar Technology AG, Niestetal (DE)
Filed on Dec. 30, 2020, as Appl. No. 17/137,646.
Prior Publication US 2022/0209572 A1, Jun. 30, 2022
Int. Cl. H02M 7/44 (2006.01); H02J 9/06 (2006.01); H02M 3/04 (2006.01)
CPC H02J 9/062 (2013.01) [H02M 3/04 (2013.01); H02M 7/44 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power converter with an inverter configured to transform electrical power between a DC-side of the power converter and an AC-side of the power converter, wherein the power converter comprises:
a first port and a second port arranged on the AC-side of the power converter; and
a third port and a fourth port arranged on the DC-side of the power converter,
wherein the first port is configured to be operatively connected to an AC-grid, the second port is configured to be operatively connected to an AC-load, the third port is configured to be operatively connected to an external power source, and the fourth port is configured to be operatively connected to a rechargeable DC-power storage, and
wherein the power converter comprises a DC/DC-converter arranged between the third port and the inverter, which is configured to transfer electrical power provided by the external power source from the third port to the inverter, and wherein the inverter is configured to be grid forming and to provide electrical power to the second port in case of disconnection from the AC-grid at the first port,
the power converter further comprising a control unit configured to monitor the third port and to detect parameters of electrical power provided via the third port,
wherein the control unit is configured to control operation of the power converter such that electrical power is prevented from being transferred from the external power source to the AC-grid or the AC-load as long as electrical power is transferred from the first port to the second port.