Simulating a 75MWp/50MWac PV + 20MW/40MWh BESS

[Ken]

Hi,

I am trying to simulate a 75MWp/50MWac PV + 20MW/40MWh BESS system with grid limitation at 50MW in which the excess is used to charge the BESS. However, the requirement is to ensure that the BESS is able to fully charge and discharge 20MW for 2hours daily. Theoretically this should amount to an average of 1.2GWh per month or 14.4GWh per year. However, based on the results obtained, the EBatDis is only at 4.3GWh per annum. 

 

 

Storage strategy is set to Peak Shaving with the following parameters

 

 

Please advise if there is any settings changes to be made to achieve desired outcome.

[Robin Vincent]

With the Peak shaving strategy, you will indeed put any excess production into the battery with respect to the charger max power and battery state of charge. 

In these conditions, you can charge your battery up to 20MW, but only if the total AC power is 50+20MW. 

Your system will always output less than 70MW (max clear sky production being estimated to 68.23MW), but will also charge for more than 2 hours a day, so your daily charging energy will be somewhere between 0 and 40MWh/day.

The actual energy will depend on the weather and battery state of charge at the beginning of the day, so you cannot predict the charging/discharging energy based on the max charging power.