Versatile uninterruptable power supply
Systems, apparatuses, and methods are described for a versatile UPS. The versatile UPS is operative to provide power to a load and to an interconnected network for delivering electricity from producers to consumers (i.e., an electricity grid, or simply, “a grid”). The versatile UPS has a plurality of switches providing for a multiplicity of switching states. The output to the load, the grid, or both is dependent, at least in part, on the switching states. Related systems, methods and apparatus is also described.
1. An apparatus comprising:
an uninterruptible power supply (UPS) comprising:
a load terminal;
a first alternating current (AC) terminal, configured to provide input AC power to a first power converter;
a second AC terminal, configured to provide additional input AC power to the load terminal;
the first power converter connected to a battery and to a second power converter;
the second power converter connected to the load terminal;
a first switch circuit disposed between the first AC terminal and the first power converter, wherein the first switch circuit comprises a first switch, a second switch, and a first silicon controlled rectifier (SCR), wherein the first switch and second switch are disposed in series between the first AC terminal and the first power converter, and wherein the first SCR is disposed in parallel to the second switch;
a second switch circuit disposed between the second AC terminal and the load terminal; and
one or more controllers configured to operate the first switch circuit, the second switch circuit, the first power converter, and the second power converter in a plurality of operating modes.
2. The apparatus according to claim 1 , wherein the one or more controllers are configured to, in at least one of the plurality of operating modes, operate the first power converter to convert direct current (DC) power to AC power.
3. The apparatus according to claim 2 , wherein the one or more controllers are configured to, in at least another one of the plurality of operating modes, operate the first power converter to convert AC power to DC power.
4. The apparatus according to claim 1 , wherein the one or more controllers are configured to, in at least one of the plurality of operating modes, operate the second power converter to convert DC power to AC power.
5. The apparatus according to claim 4 , wherein the one or more controllers are configured to, in at least another one of the plurality of operating modes, operate the second power converter to convert AC power to DC power.
6. The apparatus according to claim 1 , wherein the second switch circuit comprises a third switch, a fourth switch, and a second SCR, wherein the third switch and the fourth switch are disposed between the second AC terminal and the load terminal, and wherein the second SCR is disposed in parallel to the fourth switch.
7. The apparatus according to claim 6 , further comprising a fifth switch connected between the first switch circuit and the load terminal.
8. The apparatus according to claim 7 , wherein, when operating in one of the plurality of operating modes, the one or more controllers are configured to set:
the first switch in a closed state;
the second switch in a closed state;
the first SCR in a non-operative state;
the third switch in a closed state;
the fourth switch in an open state;
the second SCR in a non-operative state; and
the fifth switch in an open state.
9. The apparatus according to claim 7 , wherein, when operating in one of the plurality of operating modes, the one or more controllers are configured to set:
the first switch in a closed state;
the second switch in a closed state;
the first SCR in a non-operative state;
the third switch in a closed state;
the fourth switch in an open state;
the second SCR in an operative state; and
the fifth switch in an open state.
10. The apparatus according to claim 7 , wherein, when operating in one of the plurality of operating modes, the one or more controllers are configured to set:
the first switch in an open state;
the second switch in an open state;
the first SCR in a non-operative state;
the third switch in an open state;
the fourth switch in an open state;
the second SCR in non-operative state; and
the fifth switch in a closed state.
11. The apparatus according to claim 7 , wherein, when operating in one of the plurality of operating modes, the one or more controllers are configured to set:
the first switch in an open state;
the second switch in an open state;
the first SCR in a non-operative state;
the third switch in an open state;
the fourth switch in an open state;
the second SCR in a non-operative state; and
the fifth switch in an open state.
12. The apparatus according to claim 7 , wherein, when operating in one of the plurality of operating modes, the one or more controllers are configured to set:
the first switch in a closed state;
the second switch in a closed state;
the first SCR in a non-operative state;
the third switch in a closed state;
the fourth switch in a closed state;
the second SCR in a non-operative state; and
the fifth switch in an open state.
13. The apparatus according to claim 7 , wherein, when operating in one of the plurality of operating modes, the one or more controllers are configured to set:
the first switch in a closed state;
the second switch in an open state;
the first SCR in an operative state;
the third switch in a closed state;
the fourth switch in an open state;
the second SCR in an operative state; and
the fifth switch in a closed state.
14. The apparatus according to claim 7 , wherein, when operating in one of the plurality of operating modes, the one or more controllers are configured to set:
the first switch in a closed state;
the second switch in a closed state;
the first SCR in a non-operative state;
the third switch in an open state;
the fourth switch in an open state;
the second SCR in a non-operative state; and
the fifth switch in an open state.
15. The apparatus according to claim 7 , wherein, when operating in one of the plurality of operating modes, the one or more controllers are configured to set:
the first switch in a closed state;
the second switch in a closed state;
the first SCR in a non-operative state;
the third switch in a closed state;
the fourth switch in an open state;
the second SCR in a non-operative state; and
the fifth switch in an open state.
16. The apparatus according to claim 7 , wherein, when operating in one of the plurality of operating modes, the one or more controllers are configured to set:
the first switch in an open state;
the second switch in an open state;
the first SCR in a non-operative state;
the third switch in a closed state;
the fourth switch in an closed state;
the second SCR in a non-operative state; and
the fifth switch in an open state.
17. The apparatus according to claim 7 , wherein, when operating in one of the plurality of operating modes, the one or more controllers are configured to set:
the first switch in an open state;
the second switch in an open state;
the first SCR in a non-operative state;
the third switch in a closed state;
the fourth switch in an open state;
the second SCR in an operative state; and
the fifth switch in an open state.
18. The apparatus according to claim 1 , wherein the one or more controllers are configured to operate the first switch circuit, the second switch circuit, the first power converter, and the second power converter to receive the input AC power from the first AC terminal and the additional input AC power from the second AC terminal and provide the input AC power and the additional input AC power to the load terminal.
19. The apparatus according to claim 1 , wherein the one or more controllers are configured to operate the first switch circuit, the second switch circuit, the first power converter, and the second power converter to convert stored direct current (DC) power from the battery to stored AC power and provide the stored AC power to the first AC terminal or the second AC terminal.