Power processing and energy storage
A power conversion device may perform model-referenced power processing for multiple diverse power nodes. The power conversion device includes interconnects that couple power nodes connection ports to power converters The power converters include a dense tier of power converters sized to correct from varied power flow levels of a defined portion of a population of power nodes to interim power flows in accord with center values for that portion of power nodes. The center values are provided by a model of the power node diversity. The power converters also include a sparse tier. The sparse tier performs power processing to convert from the interim power flows generated by the dense tier to a uniform model-corrected target flow.
1. A device including:
multiple power store connection ports including:
a first connection port to support a first power flow range, the first power flow range spanning one or more first expected power flow levels for a first defined portion of a group of power stores; and
a second connection port to support a second power flow range, the second power flow range spanning one or more second expected power flow levels for a second defined portion of the group of power stores; and
a dense converter tier coupled to the multiple power store connection ports, the dense converter tier including:
a first dense tier power converter coupled to at least the first connection port, the first dense tier power converter configured to convert from within the first power flow range to a first interim power flow, a level of the first interim power flow selected based on a diversity model for the group of power stores; and
a second dense tier power converter coupled at least to the second connection port, the second dense tier power converter configured to convert from within the second power flow range to a second interim power flow, a level of the second interim power flow selected based on the diversity model for the group of power stores; and
a sparse converter tier coupled to the multiple power store connection ports via the dense converter tier, the sparse converter tier a sparse tier power converter configured to convert a combined power flow to a uniform model-corrected target, the combined power flow including at least a portion of each of the first and second interim power flows.
2. The device of claim 1 , where:
the first dense tier power converter is coupled to multiple ones of the multiple power store connection ports; and
the first dense tier power converter configured to convert from within the first power flow range to the first interim power flow by converting a differential power flow from the multiple ones of the multiple power store connection ports to the first interim power flow.
3. The device of claim 1 , where the multiple power store connection ports are coupled in parallel to a target port.
4. The device of claim 3 , where at least one of the multiple power store connection ports is configured to support coupling to a series of power stores as a single power store unit coupled with others of the power store connection ports in parallel to the target port.
5. The device of claim 1 , where the diversity model includes a power store degradation model.
6. The device of claim 5 , where the power store degradation model includes a model of degradation based on:
power store age;
power store type;
power store charge-discharge cycle count; or
any grouping of the foregoing.
7. The device of claim 5 , where the first and second defined portions include portions of the group of power stores corresponding to an expected distribution of degradation levels for the group of power stores according to the diversity model.
8. The device of claim 7 , where the first and second defined portions are selected such that the expected distribution results in an equal number of power stores in each of the first and second defined portions.
9. The device of claim 8 , where:
the actual distribution of degradation levels in the group of power stores deviates from the expected distribution; and
the first and second defined portions include a different number of power stores from the group of power stores.
10. The device of claim 5 , where the first and second defined portions include portions of the group of power stores corresponding to a distribution of degradation levels based on:
the diversity model; and
a characterization of at least some of the group of power stores.
11. The device of claim 5 , where the first and second defined portions include portions of the group of power stores corresponding to an individual assignment of each power store in the group of power stores to a corresponding portion.
12. The device of claim 1 , where the group of power stores include a group of batteries.
13. A device including:
multiple power store connection ports configured to support coupling to multiple power stores while the multiple power stores degrade from a non-diverse state to into a degradation state, a diversity model providing an expected degradation distribution for the multiple power stores in the degradation state;
a dense converter tier dynamically coupled to the multiple power store connection ports, the dense converter tier including:
a first dense tier power converter dynamically coupled to the multiple power store connection ports, the first dense tier power converter configured to convert from within a first power flow range to a first interim power flow, a level of the first interim power flow determined based on the diversity model; and
a second dense tier power converter dynamically coupled to the multiple power store connection ports, the second dense tier power converter configured to convert from within a second power flow range to a second interim power flow, a level of the second interim power flow determined based on the diversity model; and
a sparse converter tier coupled to the multiple power store connection ports via the dense converter tier, the sparse converter tier a sparse tier power converter configured to convert a combined power flow to a uniform model-corrected target, the combined power flow including at least a portion of each of the first and second interim power flows.
14. The device of claim 13 , further including meter circuitry configured to characterize a current degradation level, from one or more of the multiple power store connection ports.
15. The device of claim 14 , where the meter circuitry is configured to characterize the current degradation level by measuring:
a voltage at the one or more of the multiple power store connection ports;
a power store capacity for a power store coupled to the one or more of the multiple power store connection ports;
a current flow at the one or more of the multiple power store connection ports;
an internal resistance for a power store coupled to the one or more of the multiple power store connection ports; or
any grouping of the foregoing.
16. The device of claim 14 , further including switching circuitry configured to dynamically couple the dense converter tier to the multiple power store connection ports based on the characterization of the current degradation level.
17. The device of claim 13 , where the non-diverse state includes a new installation state.
18. A method including:
for multiple power store connection ports including:
a first connection port to support a first power flow range, the first power flow range spanning one or more first expected power flow levels for a first defined portion of a group of power stores; and
a second connection port to support a second power flow range, the second power flow range spanning one or more second expected power flow levels for a second defined portion of the group of power stores; and
executing a first stage of power processing at a dense converter tier coupled to the multiple power store connection ports, by:
at a first dense tier power converter coupled to at least the first connection port, converting from within the first power flow range to a first interim power flow, a level of the first interim power flow selected based on a diversity model for the group of power stores; and
at a second dense tier power converter coupled to at least the second connection port, converting from within the second power flow range to a second interim power flow, a level of the second interim power flow selected based on the diversity model for the group of power stores; and
executing a second stage of power processing at a sparse converter tier coupled to the multiple power store connection ports via the dense converter tier, by converting a combined power flow to a uniform model-corrected target, the combined power flow including at least a portion of each of the first and second interim power flows.
19. The method of claim 18 , where executing the first and second stages of power processing include partially processing power from the multiple power store connection ports.
20. The method of claim 18 , where:
the first power flow range defines an expected range of power flow level deviations a center power flow value for the first defined portion of the group of power stores provided by the diversity model; and
converting from within the first power flow range to the first interim power flow includes partially processing a portion of power flow from the first connection port that causes deviation from the center power flow value.