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Energy storage modeling and control

  • US 10,574,087 B2
  • Filed: 11/30/2018
  • Issued: 02/25/2020
  • Est. Priority Date: 04/04/2012
  • Status: Active Grant
First Claim
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1. A method for controlling operation of an energy storage system to minimize an energy cost of a micro-grid installation comprising a renewable energy generator, an on-site fossil fuel generator and an access to a power grid, the method comprising steps of:

  • (a) retrieving from a first database, using a computer, first historical data relating to historical energy usage of a user;

    (b) retrieving from a second database, using the computer, second historical data relating to historical grid rates;

    (c) retrieving from a third database, using the computer, third historical data relating to historical renewable energy generation;

    (d) receiving, at the computer, a first physical model relating to a rate of degradation of the energy storage system;

    (e) receiving, at the computer, a second physical model relating to a fuel efficiency of the on-site fossil fuel generator;

    (f) receiving, at the computer, a third physical model relating to a rate of degradation of the renewable power generator;

    (g) receiving, at the computer, pricing schemes for peak and off-peak energy rates, peak demand charges, and net-metering benefits that apply when excess renewable energy is sold back to the power grid;

    (h) receiving, at the computer, one or more possible configurations of the energy storage system;

    (i) receiving, at the computer, one or more possible operating strategies of the energy storage system to keep a power absorbed from the power grid below a user defined grid absorption limit;

    (j) receiving, at the computer, a cost model relating to relative and absolute costs of the energy storage system having different technologically feasible characteristics;

    (k) calculating, using the computer, an optimal operating strategy of the energy storage system for a lowest cost dispatch of available resources to meet a user power demand while complying with the user defined grid absorption limit, using at least one of the first historical data, the second historical data, the third historical data, the first physical model, the second physical model, the third physical model, the pricing schemes, the one or more possible configurations of the energy storage system, the one or more possible operating strategies of the energy storage system, and the cost model; and

    (l) directing, using a controller comprising digital electronic circuitry or computer hardware, the energy storage system to charge or discharge an energy storage asset in accordance with the calculated optimal operating strategy of the energy storage system, wherein the energy storage asset is charged or discharged in accordance with the calculated optimal operating strategy of the energy storage system.

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