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Here is the constraint:

$$\text{Pa} + \text{Pb}=a + b \sqrt{\text{Ir}^2 +\text{Ii}^2} + c (\text{Ir}^2 +\text{Ii}^2)$$

Here $\text{Pa}, \text{Pb}, \text{Ir},$ and $\text{Ii}$ are variables. $a, b, c$ are given parameters.

$\text{Pa} >0$, $\text{Pb}>0$, $-\text{Imax} \leq \text{Ir} \leq \text{Imax}$, and $-\text{Imax} \leq \text{Ii} \leq \text{Imax}$

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    $\begingroup$ Are $Ir$ and $Ii$ real variables? If real, then where is the square root of a complex number? If complex, what do you mean by the bound constraints on $Ir$ and $Ii$? $\endgroup$
    – Brian Borchers
    Commented Dec 5, 2022 at 1:56
  • $\begingroup$ Thanks for bringing that up, $Ir$ and $Ii$ are real variables with bounds, I have corrected my questions. $\endgroup$
    – Ghulam Mohy-ud-din
    Commented Dec 5, 2022 at 3:07
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    $\begingroup$ Do the answers esp. the one dealing with squares using McCormick envelope help?or.stackexchange.com/questions/1052/… $\endgroup$
    – Sutanu Majumdar
    Commented Dec 5, 2022 at 3:41

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