Calculation of discharge time of energy storage system

What is the discharge time of a long-duration storage system?

The discharge time of long-duration technologies varies in the range of 1 to 24 h [ 59 ]. The efficiency of PHS and CAES storage systems is around 80%, while the efficiency of HFC and thermal energy storage (TES) is around 40% and 60%, respectively. The main advantage of PHS and CAES is their long lifetime, which makes them cost-effective.

How does the discharge time determine the cost of ESS?

The discharge time should determine the cost of ESS and the cost of purchasing electricity at the peak time. This paper defaults to the peak cost of electricity purchase. At this time, the system meets the conditions for discharge, and the peak load is supplied by the energy storage.

How to determine the operation timing of PV energy storage system?

In order to make the operation timing of ESS accurate, there are three types of the relationship between the capacity and load of the PV energy storage system: Power of a photovoltaic system is higher than load power. But this time, the capacity of ESS is less than or equal to the total demand capacity of the load at peak time;

How is energy storage capacity calculated?

The energy storage capacity, E, is calculated using the efficiency calculated above to represent energy losses in the BESS itself. This is an approximation since actual battery efficiency will depend on operating parameters such as charge/discharge rate (Amps) and temperature.

How do you calculate total power generation output?

When the system is at time t, the system total power generation output can be expressed as:(1) P G (t) = {P P V (t) − P E S (t) (Energy storage charging) P P V (t) + P E S (t) (Energy storage discharge)

What is storage duration?

Storage duration is the amount of time storage can discharge at its power capacity before depleting its energy capacity. 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.