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An uninterruptible power supply system includes a plurality of functional modules interconnected to form a power distribution network coupling at least two power sources to a load. Each functional module has at least two ports coupled to at least one other of the functional modules and/or to at leas

An uninterruptible power supply system includes a plurality of functional modules interconnected to form a power distribution network coupling at least two power sources to a load. Each functional module has at least two ports coupled to at least one other of the functional modules and/or to at least one other external device and includes a control circuit configured to autonomously control at least one function relating to electrical power transfer between the at least two ports. The system further includes a controller module configured to communicate with each of the functional modules over at least one digital communication link to control power flow between the at least two power sources and the load.

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1. An uninterruptible power supply system comprising: a plurality of functional modules interconnected to form a power distribution network coupling at least two power sources to a load, each functional module having at least two ports coupled to at least one other of the functional modules and/or t

1. An uninterruptible power supply system comprising: a plurality of functional modules interconnected to form a power distribution network coupling at least two power sources to a load, each functional module having at least two ports coupled to at least one other of the functional modules and/or to at least one other external device and the functional modules comprising respective control circuits configured to autonomously control at least one function relating to electrical power transfer between the at least two ports; anda controller module configured to communicate with the controller circuits of the functional modules over at least one digital communication link to control power flow between the at least two power sources and the load, wherein the functional modules are flexibly interconnectable to provide a variety of different uninterruptible power system topologies and wherein the controller module is configurable to use respective different network models for control of the different uninterruptible power system topologies. 2. The system of claim 1, wherein the plurality of functional modules comprise at least two functional modules coupled to at least two different power sources and at least one functional module coupled to at least one load and wherein the controller module is configured to communicate with the plurality of functional modules to selectively couple the at least two different power sources to the at least one load. 3. The system of claim 2, wherein the controller module is configured to maintain a model for the system and to communicate with the plurality of functional modules according to the model. 4. The system of claim 1, wherein the plurality of functional modules comprises a switch module configured to provide at least one switch coupling at least one input port to at least one output port, wherein the control circuit of the switch module is configured to autonomously monitor at least one electrical parameter at the at least one input port and/or the at least one output port and responsively control the at least one switch and wherein the control circuit of the switch module is further configured to control the at least one switch responsive to a control signal received from the controller module via the at least one digital communications link. 5. The system of claim 4, wherein the at least one switch comprises a double pole switch configured to selectively couple at least two input ports to one output port. 6. The system of claim 5, wherein the at least two input ports are coupled to respective power sources and wherein the control circuit of the switch module is further configured to communicate with at least one of the power sources. 7. The system of claim 6, wherein switch module comprises a single pole switch configured to couple and decouple one input port and one output port. 8. The system of claim 1, wherein the plurality of functional modules comprises a power converter module comprising a converter circuit coupled between first and second ports of the power converter module and wherein the control circuit of the power converter module is configured to regulate an output of the converter circuit. 9. The system of claim 8, wherein the converter circuit comprises a rectifier circuit, an inverter circuit or a DC/DC converter circuit. 10. A method comprising: interconnecting a plurality of functional modules to provide a network coupling at least two power sources and at least one load, each functional module having at least two ports configured to be coupled to at least one other functional module and/or to at least one other external device, wherein the functional modules comprise respective control circuits configured to autonomously control at least one function relating to electrical power transfer between the at least two ports and the functional modules flexibly interconnectable to provide a variety of different uninterruptible power system topologies;coupling a controller module to the functional modules using at least one digital communication link, wherein the controller module is configurable to operate according to respective network models corresponding to the different uninterruptible power system topologies;configuring the controller module to operate according to a network model corresponding to the interconnection of the plurality of functional modules;autonomously operating each functional module to control at least one function relating to electrical power transfer between the at least two ports of the functional module; andcommunicating between the controller module and the functional modules to control power flow between the at least two power sources and the load. 11. The method of claim 10, further comprising the controller module maintaining a model for the system and wherein communicating between the controller module and the functional modules to control power flow between the at least two power sources and the load comprises communicating with the plurality of functional modules according to the model. 12. The method of claim 10, wherein the plurality of functional modules comprises a switch module configured to provide at least one switch coupling at least one input port to at least one output port of the switch module and a power converter module comprising a converter circuit coupled between first and second ports of the power converter module.