DC/DC converter for distributed storage and solar systems
AssigneeNextracker LLC
InventorYang Liu
Life of this patent
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Abstract
A multi-power distributed storage system including a first power source; a second power source electrically connected to a common bus with the first power source; a single input port inverter electrically connected to the common bus. The system including a controller configured to communicate with at least the second power source, and the single input port inverter. The second power source including a plurality of battery banks and a plurality of bi-directional DC/DC converters configured to charge and discharge the plurality of battery banks and provide DC to the single input port inverter.
Claims9
A method for implementing a multi-power distributed power storage and generation system comprising:
- feeding power generated by a plurality of solar arrays of a solar power plant directly to a common bus;
- discharging, by a plurality of bi-directional DC/DC converters of a DC storage plant, power from at least one of a plurality of battery banks, respectively, directly to the common bus;
- feeding a voltage on the common bus to a single input port inverter;
- monitoring, by a system controller, a power demand of an external load;
- maintaining constant power output from the DC storage plant in a maximum power point tracking (MPPT) region of the solar power plant using a power droop method enabling local control of power output from the DC storage plant based on the power demand of the external load;
- ramping down an output power of the plurality of bi-directional DC/DC converters when a voltage on the common bus is higher than the MPPT region;
- ramping up an output power of the plurality of bi-directional DC/DC converters when a voltage on the common bus is lower than the MPPT region;
- and
- maintaining maximum power output of the solar power plant.
A multi-power distributed storage system comprising:
- a first power source electrically and directly connected to a common bus;
- a second power source electrically and directly connected to the common bus;
- a single input port inverter electrically connected to the common bus;
- and
- a system controller configured to communicate with at least the second power source and the single input port inverter,
- wherein the first power source includes a solar power plant including a plurality of solar modules,
- wherein the second power source includes a DC storage plant including a plurality of battery banks and a plurality of bi-directional DC/DC converters configured to charge and discharge the plurality of battery banks,
- wherein, when a grid power curtailment command is received at the single input port inverter, a common bus voltage rises and the second power source reduces output power in response to the rise in the common bus voltage,
- wherein, when a load increases, the common bus voltage lowers and the second power source increases output power, and
- wherein, when maintaining constant power, constant power output from the DC storage plant is maintained using a power droop method enabling local control of power output from the DC storage plant based on a power demand of an external load.
A method for implementing a multi-power distributed power storage system comprising:
- feeding a single input port inverter an output voltage from a first power source and a second power source including bi-directional DC/DC converters via a common bus directly coupled to the first power source and the second power source;
- maintaining constant power output of a DC storage plant in a maximum power point tracking (MPPT) region of the first power source using a power droop method enabling local control of power output from the second power source based on a power demand of an external load;
- ramping down an output power of the bi-directional DC/DC converters when a voltage on the common bus is higher than the MPPT region;
- ramping up an output power of the bi-directional DC/DC converters when a voltage on the common bus is lower than the MPPT region;
- and
- maintaining maximum power output of the single input port inverter.
Dependencies are inferred from the claim text.