Plural bus arrangement for electrical supply in a vehicle
An electric supply system for a vehicle system includes two or more electric energy storage devices. Two or more buses each conductively couple an energy storage device with a corresponding load of plural loads. A controller controls conduction of current from one or more of the energy storage devices to one or more other buses to transfer energy to other energy storage devices or other loads. A method includes directing a first energy storage device of a first power supply assembly to supply electric current to a first bus conductively coupling the first energy storage device to one or more first loads onboard the vehicle system. The method further includes conducting the electric current from the first energy storage device to one or more second buses of one or more second power supply assemblies to recharge one or more second energy storage devices or power one or more second loads.
1. An electric supply system for a vehicle system, the electric supply system comprising:
two or more energy storage devices of a plurality of energy storage devices configured to store electric energy onboard the vehicle system;
two or more buses, each of the two or more buses conductively coupling an energy storage device of the two or more energy storage devices with a corresponding load of a plurality of loads of the vehicle system;
a controller configured to:
control conduction of electric current from of the two or more energy storage devices to one or more other buses to transfer energy to one or more other energy storage devices of the plurality of energy storage devices or to other loads of the one or more other buses;
operate a first converter for a first energy storage device of the two or more energy storage devices to output the electric current from the first energy storage device and the two or more buses are configured to conduct a first portion of the electric current supplied by the first energy storage device to power one or more loads of the plurality of loads;
control charging of a second energy storage device of the two or more energy storage devices by controlling a second converter to output a second portion of the electric current to the second energy storage device while the two or more buses conduct the first portion of the electric current to power the one or more loads;
a connection device configured to selectively couple each of the plurality of energy storage devices with a first load of the plurality of loads in a first state or with a power supply source in a second state, wherein the controller is configured to change the connection device to the second state to couple each of the plurality of energy storage devices to the power supply source to recharge each of the plurality of energy storage devices; and
wherein the controller is configured to transfer the electric current from the two or more energy storage devices to the one or more other energy storage devices while the connection device is in the second state and the power supply source is disconnected from the two or more energy storage devices.
2. The electric supply system of claim 1 , wherein the controller is configured to operate the first converter to output the electric current as alternating current and to operate the second converter as a pulse width modulation rectifier to charge the second energy storage device or provide power to a bus of the two or more buses coupled to the second energy storage device.
3. The electric supply system of claim 1 , wherein the controller is configured to operate the first converter to output the electric current as single-phase alternating current.
4. The electric supply system of claim 1 , wherein the plurality of loads comprises one or more motors of the vehicle system.
5. A vehicle system electric supply system comprising:
a plurality of power supply assemblies provided on one or more vehicles of a vehicle system, each of the plurality of power supply assemblies including:
a battery assembly including rechargeable energy storage devices, two or more converters coupled to the battery assembly,
one or more loads on the one or more vehicles of the vehicle system, each load coupled to at least one converter, and
a bus conductively coupled with the battery assembly and the two or more converters, wherein at least one of the two or more converters of each of the plurality of power supply assemblies is coupled to at least one bus of one other power supply assembly of the plurality of power supply assemblies;
a controller coupled to each of the plurality of power supply assemblies, the controller configured to:
control conduction of electric current from a first rechargeable energy storage device of one power supply assembly to a) a second rechargeable energy storage device to charge the second rechargeable energy storage device or b) the one or more loads of the plurality of power supply assemblies;
operate a first converter for the first rechargeable energy storage device to output the electric current from the first rechargeable energy storage device and two or more buses are configured to conduct a first portion of the electric current supplied by the first rechargeable energy storage device to power the one or more loads;
control charging of the second rechargeable energy storage device by controlling a second converter to direct a second portion of the electric current to the second rechargeable energy storage device while the two or more buses conduct the first portion of the electric current to power the one or more loads;
a connection device configured to:
selectively couple each rechargeable energy storage device in a first state with a first load or in a second state with a power supply source offboard the vehicle system, wherein the controller is configured to put the connection device in the second state to couple each rechargeable energy storage device to the power supply source to recharge each rechargeable energy storage device; and
transfer electric current from the first rechargeable energy storage device to the second rechargeable energy storage device when the connection device of the first rechargeable energy storage device and the second rechargeable energy storage device are in the second state and the power supply source is disconnected from the plurality of power supply assemblies.
6. The vehicle system electric supply system of claim 5 , wherein the controller is configured to operate the first converter of a first power supply assembly of the plurality of power supply assemblies to produce a first electric current from the first rechargeable energy storage device as alternating current and to operate the second converter of a second power supply assembly of the plurality of power supply assemblies as a pulse width modulation rectifier to charge the second rechargeable energy storage device or to provide power to the bus coupled to the second power supply assembly.
7. The vehicle system electric supply system of claim 5 , wherein the first load comprises a motor of the vehicle system.
8. A method, comprising:
directing a first energy storage device of a first power supply assembly of a plurality of power supply assemblies provided onboard a vehicle system to supply electric current to a first bus conductively coupling the first energy storage device to one or more first loads onboard the vehicle system;
conducting a first portion of the electric current from the first energy storage device to one or more second buses of one or more second power supply assemblies of the plurality of power supply assemblies to recharge one or more second energy storage devices; and
conducting a second portion of the electric current from the first energy storage device to power one or more second loads of the one or more second power supply assemblies conductively coupled to the one or more second buses while conducting the first portion of the electric current to the one or more second buses of the one or more second power supply assemblies, the one or more second loads being onboard the vehicle system;
connection device configured to couple an energy storage device of the plurality of power supply assemblies with the one or more first loads or the one or more second loads in a first state or with a power supply source offboard the vehicle system in a second state, the method further comprising placing the connection device of the first power supply assembly in the second state to couple the first energy storage device to the one or more second buses of the one or more second power supply assemblies;
transferring the electric current from the first power supply assembly to the one or more second energy storage devices of the one or more second power supply assemblies when the connection device of the first power supply assembly is in the second state and the power supply source is disconnected from the first power supply assembly; and
transferring the electric current from the first power supply assembly to the one or more second loads of the one or more second power supply assemblies when the connection device of the first power supply assembly is in the second state and the power supply source is disconnected from the first power supply assembly.
9. The method of claim 8 , further comprising:
connecting the first bus and one of the one or more second buses to the power supply source; and
one or more of a) recharging one or more of the first energy storage device or the one or more second energy storage devices, or b) running the one or more first loads or the one or more second loads.
10. The method of claim 8 , wherein the power supply source is an AC voltage source.
11. The method of claim 8 , wherein the power supply source is a DC voltage source.