I want to write conditional statement properly

Dear AIMMS Team,

Trust this meets you well? Kindly assist on the problem explained below and find attached the AIMMS file I am working with.  

I have a variable StateofCharge(t) in which t is 1 to 24. 

I want to place StateofCharge(t) at t = 1 or StateofCharge(01) on the conditional statement below. 

if ( (Charging_Power_kW(01) + SoCMin) > SoCMax) then
     SocMax 
     else

Charging_Power_kW(01) + SoCMin
endif;

Note: Charging_Power_kW(01) is put as the value of variable Charging_Power_kW(t) at t=1

While StateofCharge(t) at t = 2,….24 should have the conditional statement below. The index t in the statement applies only from t = 2,….24. 

If Energy_Difference_kW(t) > 0 then
      if (StateofCharge(t-1) + Charging_Power_kW(t)) > SoCMax
       SoCMax
       else
       StateofCharge(t-1) + Charging_Power_kW(t)
     
elseif (Energy_Difference_kW(t)) < 0 then
       if (StateofCharge(t-1) - SoCMin) > Discharging_Power_kW(t)
       else 
       SoCMin
endif;

Also, if I have a parameter/variable, P(t), t=1,...24, how can I extract a cell? For example: P(5) or a parameter/variable with a double index P(t, k), t=1,..24 and k=1,...5, how can I write the value in cell P(2,4)?

Thank you.

Kind regards. 

Hello @Marcel Hunting,

Thank you for your response. Most of the questions have been answered from the program you wrote. 

However, there is still an issue I am trying to address. 

I want the first conditional statement below to hold only for StateofCharge(t) at t = 1 only

if ( (Charging_Power_kW(01) + SoCMin) > SoCMax) then
     SocMax 
     else

Charging_Power_kW(01) + SoCMin
endif;

Note: This has been answered from your reply. 

……………………………………………………………………………………………………………………

So here is the issue….

However, I want the second conditional statement below to hold only for StateofCharge(t) at t = 2,….24 (or at t= 2 to the end) only

If Energy_Difference_kW(t) > 0 then
      if (StateofCharge(t-1) + Charging_Power_kW(t)) > SoCMax
       SoCMax
       else
       StateofCharge(t-1) + Charging_Power_kW(t)
     
elseif (Energy_Difference_kW(t)) < 0 then
       if (StateofCharge(t-1) - SoCMin) > Discharging_Power_kW(t)
       else 
       SoCMin
endif;

Thank you once again. 

Hi @Lawrence. The second conditional statement for StateofCharge(t) at t = 2,….24 is also handled in my answer. Note that the definition contains three blocks. The first block

if ( t = '01' ) then
    if (Charging_Power_kW(t) + SoCMin > SoCMax) then
        SocMax 
    else
        Charging_Power_kW(t) + SoCMin
    endif

handles the situation for t=01. For t unequal to ‘01’ the other two blocks will be used:

elseif (Energy_Difference_kW(t) > 0) then
    if (StateofCharge(t-1) + Charging_Power_kW(t) > SoCMax) then
       	SoCMax
    else
       	StateofCharge(t-1) + Charging_Power_kW(t)
    endif
elseif (Energy_Difference_kW(t) < 0) then
    if (StateofCharge(t-1) - SoCMin > Discharging_Power_kW(t)) then
    	StateofCharge(t-1) - SoCMin
    else 
       	SoCMin
    endif
endif;

Thank you. It is clear!