US RE50,626 E1
Power generation system and inverter for feeding power into a three-phase grid
Oliver Prior, Bad Arolsen (DE); Thomas Schroeder, Kassel (DE); and Henrik Wolf, Kassel (DE)
Assigned to SMA Solar Technology AG, Niestetal (DE)
Filed by SMA Solar Technology AG, Niestetal (DE)
Filed on Jan. 24, 2020, as Appl. No. 16/751,794.
Application 16/751,794 is a reissue of application No. 12/719,662, filed on Mar. 8, 2010, granted, now 8,779,630, issued on Jul. 15, 2014.
Claims priority of application No. 09003353 (EP), filed on Mar. 9, 2009.
Int. Cl. H02M 7/48 (2007.01); H01H 47/00 (2006.01)
CPC H02M 7/48 (2013.01) [H01H 47/002 (2013.01)] 1 Claim
OG exemplary drawing
 
[ 24. A power generation system for feeding electrical power from a generation unit into a three-phase grid via three AC terminals, the system comprising:
inverter circuitry comprising:
DC input terminals configured to receive DC power;
three AC terminals configured to provide three-phase AC power;
a bridge configured to convert the DC power into the three-phase AC power and connected between the DC input terminals and the three AC terminals;
a first electrical path connecting a first leg of the bridge to a first AC terminal of the AC terminals;
a second electrical path connecting a second leg of the bridge to a second AC terminal of the AC terminals; and
a third electrical path connecting a third leg of the bridge to a third AC terminal of the AC terminals;
a relay arrangement configured to disconnect the inverter from three active conductors of the three-phase grid, the relay arrangement comprising exactly three relays and comprising;
a first output terminal connected to a first input terminal of the relay arrangement via a first switching contact and a second switching contact, wherein the first switching contact is directly connected to the first input terminal, wherein the second switching contact is directly connected to the first output terminal, and wherein the first and second switching contacts are directly connected to each other and the first input terminal is connected to the first AC terminal;
a second output terminal connected to a second input terminal of the relay arrangement via a third switching contact and a fourth switching contact, wherein the third switching contact is directly connected to the second input terminal, wherein the fourth switching contact is directly connected to the second output terminal, and wherein the third and fourth switching contacts are directly connected to each other and the second input terminal is connected to the second AC terminal; and
a third output terminal connected to a third input terminal of the relay arrangement via a fifth switching contact and a sixth switching contact, wherein the fifth switching contact is directly connected to the third input terminal, wherein the sixth switching contact is directly connected to the third output terminal, and wherein the fifth and sixth switching contacts are directly connected to each other and the third input terminal is connected to the third AC terminal,
wherein the first and sixth switching contacts are commonly operable by a first control coil of a first relay,
wherein the second and third switching contacts are commonly operable by a second control coil of a second relay,
wherein the fourth and fifth switching contacts are commonly operable by a third control coil of a third relay,
wherein each of the first, second and third relays comprises a control coil and has exactly two switching contacts operated by the corresponding control coil,
wherein the first output terminal, second output terminal and third output terminals are connected to the three-phase grid, and
wherein the relay arrangement is integrated into a housing of the system. ]