PULSED CHARGING FOR ENERGY SOURCES OF CONNECTED MODULES
Embodiments that provide advanced charging of energy source arrangements for energy storage applications are disclosed. The embodiments can be used within energy storage systems having a cascaded arrangement of converter modules. The embodiments can include the application of pulses to an energy source of each module of the system. The pulses can be applied for charging and preheating purposes. Control techniques can be used to distribute charge signals from a charge source to multiple modules of an energy storage system.
1 . An energy storage system, comprising:
a plurality of modules connected together, each module comprising an energy source and switch circuitry, wherein the energy storage system is configured to generate AC power with a superposition of output signals generated by the plurality of modules; and
a control system configured to control the switch circuitry of each module to generate, from a supply charge signal received from a charge source, a charge signal comprising a plurality of charge pulses and apply the charge signal to the energy source such that the plurality of charge pulses applied to the energy source of each module is shifted in time relative to the plurality of charge pulses applied to the energy source of one or more other modules of the energy storage system.
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5 . The system of claim 1 , wherein the control system is configured to control the switch circuitry of each module to distribute the supply charge signal among the plurality of modules.
6 . The system of claim 1 , wherein the plurality of charge pulses applied to the energy source of each module is shifted in time relative to the plurality of charge pulses applied to the energy source of all other modules of the energy storage system.
7 . The system of claim 1 , wherein the plurality of charge pulses applied to the energy source of each module is shifted in time relative to the plurality of charge pulses applied to the energy source of one or more other modules of the energy storage system such that, at any given time during charging, a charge pulse is being applied to the energy source of one half of the plurality of modules.
8 . The system of claim 1 , wherein the control system is configured to control the switch circuitry of each module such that a duty cycle of the plurality of charge pulses is based on a number of modules in the plurality of modules or a number of modules being charged.
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12 . The system of claim 1 , wherein the control system is configured to control the switch circuitry of each module such that a duty cycle of the plurality of charge pulses is 50%.
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16 . The system of claim 1 , wherein:
the plurality of modules comprises a plurality of groups of modules; and
the control system is configured to control the switch circuitry of each module to apply the charge signal comprising the plurality of charge pulses to the energy source such that the plurality of charge pulses applied to the energy source of each module in each group of modules is shifted in time relative to the plurality of charge pulses applied to the energy source of each module in each other group of modules.
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19 . The system of claim 16 , wherein the control system is configured to control the switch circuitry of each module in each group of modules such that a duty cycle of the plurality of charge pulses is based on a number of groups in the plurality of groups of modules.
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21 . The system of claim 1 , wherein:
each module of the plurality of modules is assigned to a respective cluster; and
the control system is configured to control the switch circuitry of each module to apply the charge signal comprising the plurality of charge pulses to the energy source such that the plurality of charge pulses applied to the energy source of each module in each cluster of modules is shifted in time relative to the plurality of charge pulses applied to the energy source of each module in each other cluster of modules.
22 . The system of claim 21 , wherein the modules of the plurality of modules are assigned to particular clusters based on respective physical locations of the modules in the energy storage system or in a pack or packs of the energy storage system.
23 . The system of claim 21 , wherein the modules of the plurality of modules are arranged in two or more arrays of modules and each of the modules of a cluster are all the modules of a corresponding array of modules.
24 . The system of claim 21 , wherein the modules of the plurality of modules are arranged in two or more arrays of modules and at least one module from each array is in each cluster.
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35 . The system of claim 1 , wherein the control system is configured to determine a duty cycle for the plurality of charge pulses for each module.
36 . The system of claim 35 , wherein the control system is configured to determine a duty cycle for the plurality of charge pulses for each module based on one or more operating characteristics of the module, wherein the one or more operating characteristics comprise at least one of temperature, state of charge, impedance, or aging.
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39 . The system of claim 1 wherein the control system is configured to:
determine a charge rate for each module based on the one or more operating characteristics of the module; and
determine the duty cycle for the plurality of charge pulses for each module based on the charge rate for each module.
40 . The system of claim 1 , wherein the control system is configured to adjust a duty cycle for the plurality of charge pulses for each module in response to one or more modules being placed in a bypassed state.
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43 . The system of claim 1 , wherein the control system is configured to adjust a duty cycle for the plurality of charge pulses for each module to balance one or more operating characteristics of the plurality of modules.
44 . The system of claim 1 , wherein the control system is configured to:
detect a state of charge condition for the plurality of modules; and
adjust control of the switch circuitry of each module to charge the energy source of each module using a constant current charge signal supplied by the charge source.
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64 . An energy storage system, comprising:
a plurality of modules, each module comprising an energy source; and
means for applying, to charge each energy source of each module, a respective charge signal comprising a sequence of charge pulses such that the charge pulses applied to the energy source of each module are shifted in time relative to the charge pulses applied to the energy source of one or more other modules of the energy storage system.
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94 . A method of charging a plurality of modules from a supply charge signal, the plurality of modules being connected together, each module comprising an energy source, the method comprising:
generating, from the supply charge signal, for each module, a respective pulse charge signal comprising a plurality of charge pulses;
applying the respective pulse charge signal to the energy source of the respective module such that the plurality of charge pulses applied to the energy source of each module is shifted in time relative to the plurality of charge pulses applied to the energy source of one or more other modules of the plurality of modules.
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