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Energy storage system and method for direct coupling energy storage and power source

  • US 10,581,266 B2
  • Filed: 04/23/2018
  • Issued: 03/03/2020
  • Est. Priority Date: 04/16/2018
  • Status: Active Grant
First Claim
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1. An energy storage system for direct DC coupling, the energy storage system comprising:

  • a power source electrically connected to a first node;

    a power converter coupled to the first node, the power converter controlling the output voltage of the power source, the power converter having a first port coupled to the first node and a second port coupled to a bus;

    an energy storage unit direct DC coupled to the power source at the first node through a main switch, wherein the energy storage unit draws energy from the power source or the bus when charging and supplies energy to the bus when discharging;

    the main switch for electrically connecting and electrically disconnecting the energy storage unit from the first node, the main switch being coupled between the first node and the energy storage unit;

    a break path coupled to the first node and for diverting power away from the first node when the break path is electrically connected to the first node;

    a control system for controlling the electrical connection and electrical disconnection of the energy storage unit from the first node, the control system being configured to;

    control the power converter to adjust the magnitude of the output voltage at the first node to a magnitude of an energy storage unit voltage;

    determining whether adjusting the magnitude of the output voltage at the first node to the magnitude of the energy storage unit voltage causes power output of the power converter to exceed the power converter'"'"'s limits;

    in response to determining that adjusting the magnitude of the voltage at the first node to the magnitude of the energy storage unit voltage will not cause power output of the power converter to exceed the power converter'"'"'s limits;

    closing the main switch to electrically connect the energy storage unit to the first node once the magnitude of the voltage at the first node matches the magnitude of the energy storage unit voltage;

    in response to determining that adjusting the magnitude of the voltage at the first node to the magnitude of the energy storage unit voltage will cause power output of the power converter to exceed the power converter'"'"'s limits;

    electrically connecting the break path to the first node for diverting power away from the first node;

    adjusting the magnitude of the voltage at the first node to match the magnitude of the energy storage unit voltage; and

    once the magnitude of the voltage at the first node is adjusted to match the magnitude of the energy storage unit voltage, electrically connecting the energy storage unit to the first node and electrically disconnecting the break path from the first node.

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