IEEE Std 1679 pdf free download

IEEE Std 1679 pdf free download.Characterization and Evaluation of Energy Storage Technologies in Stationary Applications.
3.1.2 Energy rating
An energy rating expresses usable energy storage capacity of the device. For energy ratings to be meaningful, all limiting parameters such as rate, temperature, state of charge (SOC), and end-of-discharge voltage should be specified. Energy ratings should be expressed in watt-hours (Wh). It is also recommended to know the coulombic storage capability for a given discharge rate. This is usually termed capacity and is expressed in ampere-hours (Ah). If the capacity is given in watt-hours, then the nominal voltage should also be specified to allow calculation of the capacity in ampere-hours. The nameplate rating of the device in waft-hours or kilowatt-hours should be accompanied by the rate of discharge in watts or kilowatts or the time over which the rated energy can be discharged.
Other rating methods may also be provided, such as specific energy (watt-hours/kilogram [Wh/kg]), energy density (watt-hours!liter [Wh/Lj), etc. If these parameters are specified, the configurations and conditions under which the rating is valid should be included.
Energy ratings are normally based on products at the beginning of life. The manufacturer should state how available energy from the device may vary over service life (see also 3.2).
3.1.3 Power rating
Power ratings for energy storage devices are specified in a number of ways. In order to provide a rating that is useful for comparison of technologies, the rating should include all limiting parameters, such as the following:
The duration of the discharge
The operating voltage range
– Temperature
NO I h—ln addition to power limitations in charge or discharge due to initial operating temperature, operation may also he restricted by temperature rise due to Joule heating.
The SOC for which the power rating is specified
Power ratings should be specified in watts (W) over a defined period of time.
Other rating methods may also be provided, such as specific power (watts/kilogram [W/kgj), power density (watts/liter [W’L]), etc. If these parameters are specified. the conditions under which the rating is valid (rate, temperature, SOC. discharge time, etc.) should be included, and the ratings should be valid for a complete system.
Power ratings are normally based on products at the beginning of life. The manufacturer should state how the
available power from the device may vary over time (see also 3.2).
3.1.4 Cycling capability
The ability of an energy storage technology to sustain repeated charge and discharge cycles of varying depth of discharge (DOD) is essential to certain applications. To provide a specification of cycling capability (cycle life) that is meaningful for comparison of technologies, the DOD of the cycles and the limiting or end-of- life condition (see 3.2.1) should be specifIed. Optimally, the cycling capability should be determined by performing testing that is representative of the use in the end application. The number of cycles should be specified with the pertinent conditions under which the performance was obtained, including, but not limited to, the following:
— End voltage SOC range
— Temperature
— Discharge and recharge profile or rate
— Flow often. if ever, a conditioning cycle is required to maintain the capability of the device
IEEE Std 1679 pdf download.