Power output of Parabolic trough system with storage system

Dear all,
I have attached SAM file and excel file of parametric analysis of a parabolic trough system.
The analysis was done for electrical power generated and time for different storage hours.
My problem is why I can't have smooth power output? and why do I get minus (-) outputs?

Dear Chathura;
I think your question is related with the following questions.
negative and zero values sam.nrel.gov/node/69580
Negative monthly energy (kWh) for months jan, feb, oct, nov and dec. sam.nrel.gov/node/69580
Negative monthly energy (kWh) for months jan, feb, oct, nov and dec. sam.nrel.gov/node/71557
CSP output does not look right sam.nrel.gov/content/csp-output-does-not-look-right
You may want to have a quick look to those answers. Those answers may help to your case too.
Have a nice day
Best Regards
Burak Omer Saracoglu

Hello,

Please do review the information in the links Burak provided.

You might try increasing the solar multiple to ensure that there is sufficient excess solar field energy to charge the storage system.

The negative values at night represent the energy required for freeze protection.

Best regards,
Paul.