Systems and methods for uninterruptible power supplies with bidirectional power converters

1. An electrical power system, comprising:

a multiport power converter, comprising a plurality of electrical ports, each having at least two lines, and an energy transfer reactance comprising an inductor and a capacitor in parallel, wherein each said line of each said port is connected to each end of said energy transfer reactance through multiple respective bidirectional switches;

a DC power source connected to a first one of said ports, and an AC power source connected to a second one of said ports, a third one of said ports being connected to lines of a utility power grid, and a fourth one of said ports being connected to an electrical load; and

wherein said converter draws power from said first, second, and/or third ports, and drives power into said first, third, and/or fourth ports,

while changing the frequency and/or phase of power received at said second port to thereby provide power synchronously to said third and/or fourth ports, and

while also compensating transients when power is output to said first port, to thereby provide a smooth power waveform.

2. The electrical power system of claim 1 , wherein said DC power source comprises a battery.

3. The electrical power system of claim 1 , wherein said DC power source comprises a photovoltaic array.

4. The electrical power system of claim 1 , wherein said AC power source comprises a wind-driven power source.

5. The electrical power system of claim 1 , wherein said AC power source comprises a combustion-driven power source.

6. An electrical power system, comprising:

a multiport power converter, comprising a plurality of electrical ports, each having at least two lines, and an energy transfer reactance comprising an inductor and a capacitor in parallel, wherein each said line of each said port is connected to each end of said energy transfer reactance through multiple respective bidirectional switches;

one or more DC power sources connected to respective first ones of said ports, and one or more AC power sources connected to respective second ones of said ports, a third one of said ports being connected through switchgear to lines of a utility power grid, and one or more fourth ones of said ports being connected to provide one or more respective electrical load terminals, and;

wherein said converter draws power from said first, second, and/or third ports, and drives power into said first, third, and/or fourth ports,

while changing the frequency and/or phase of power received at said one or more second ports to thereby provide power synchronously to said third and/or fourth ports, and

while also compensating transients when power is output to said one or more first ports, to thereby provide a smooth power waveform.

7. The electrical power system of claim 6 , wherein said one or more DC power sources comprise a battery.

8. The electrical power system of claim 6 , wherein said one or more DC power sources comprise a photovoltaic array.

9. The electrical power system of claim 6 , wherein said one or more AC power sources comprise a wind-driven power source.

10. The electrical power system of claim 6 , wherein said one or more AC power sources comprise a combustion-driven power source.

11. An electrical power system, comprising:

a bidirectional multiport power converter, comprising:

a plurality of input/output portals, each comprising one or more ports;

an energy transfer reactance comprising an inductor and a capacitor in parallel, wherein each said port of each said input/output portal is connected in parallel to each end of said energy transfer reactance by a pair of bidirectional switching devices;

wherein, at various times, said energy transfer reactance can be connected to two said ports, to transfer energy there between; and

wherein, at various times, said energy transfer reactance can be disconnected from said input/output portals;

a DC power source connected to a first said input/output portal of said bidirectional multiport power converter supplying converted AC power to an electrical load under normal condition, said electrical load being connected to a second said input/output portal;

at least one battery connected to a third said input/output portal of said bidirectional multiport power converter;

wherein said at least one battery supplies AC power to the electrical load when said electrical load requires more AC power than said DC power source can supply.

12. The electrical power system of claim 11 , wherein, when said DC source is generating more power than required to power said electrical load, operating the bidirectional multiport power converter to convert excess AC power to DC power to provide to the at least one battery to charge said battery.

13. The electrical power system of claim 11 , wherein, when said DC source is generating less power than required to power said electrical load, the bidirectional multiport power converter delivers AC power to the electrical load from said at least one battery.

14. The electrical power system of claim 11 , further comprising an AC source connected to the electrical load; wherein, when the power generated by the AC source exceeds the power required by the electrical load, the excess power is used to charge the at least one battery.

15. The electrical power system of claim 14 , wherein the AC power source comprises an electric generator.

16. The electrical power system of claim 11 , wherein the electrical load comprises at least one of:

an installation;

a building;

a commercial building;

a conveyance;

a communication tower; and

a computer server facility.

17. The electrical power system of claim 11 , wherein the at least one battery comprises a plurality of batteries.