What is a battery energy storage system?

A battery energy storage system (BESS) is an electrochemical device that charges (or collects energy) from the grid or a power plant and then discharges that energy at a later time to provide electricity or other grid services when needed.

What is the difference between energy storage duration and discharge rate?

For some technologies, the energy available may be proportional to the discharge rate and temperature (higher discharge rates typically allow less energy to be removed from the battery). Storage duration is the amount of time the energy storage can discharge at the system power capacity before depleting its energy capacity.

What is a charge/discharge dataset?

The dataset provides high frequency (cell-by-cell and battery wise) measurements of voltage, temperature and inverter current/voltage for each of the tested charge/discharge profiles. The dataset is provided in well structured folders with ‘.csv’ files and a starter MATLAB script.

How long does a battery storage system last?

For example, a battery with 1 MW of power capacity and 4 MWh of usable energy capacity will have a storage duration of four hours. Cycle life/lifetime is the amount of time or cycles a battery storage system can provide regular charging and discharging before failure or significant degradation.

What data is included in the battery archive dataset?

The dataset contains in-cycle measurements of current, voltage and charged/discharged capacity and energy, and per cycle measurements of charge/discharge capacity. Roughly every 100 cycles RPTs were run which are also present in the data. Files are in ‘.csv’ format and shared under ‘CC BY 4.0’ plus ‘source attribution’ to Battery Archive.

Why are battery energy storage systems important for BPS reliability?

Along with this increase in IBR, primarily from the addition of a large contribution of renewable resources (e.g., wind, solar), there has been an increase in the application of battery energy storage systems (BESS) on the BPS. BESS have the ability to complement IBRs by providing some of the ERS that are important to maintain BPS reliability.