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US 2014/0368038 A1Published application
Systems and methods for uninterruptible power supplies with bidirectional power converters
AssigneeIdeal Power Inc.
InventorWilliam C. Alexander
Life of this patent
Estimating the term…
Abstract
Electrical power systems and methods using bidirectional power converters to provide, among other functions, uninterruptible power supplies for loads such as cell towers. The power-packet-switching power converter can be connected, for example, to a photovoltaic array, batteries, and a critical load such as a cell tower. An AC generator can also be connected in order to power the cell tower and/or to charge the batteries as needed. Green energy utilization is maximized, power conversion efficiency is increased, and system costs are decreased, by having only a single power conversion stage for all conversions.
Claims18
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.
3 more elements
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.
2 more elements
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.
6 more elements
18-38. (canceled)
Dependencies are inferred from the claim text.