The objective function has to be defined first right? 

possibilities are:

1. minimization of loss

2. minimization of cost

3. Improving V profile so that voltage collapse is avoided.

4. minimization of both loss and cost?

Dear Ashok:

Your problem is a particular case of  the compensation of reactive power in complex circuits. I have worked on this problem using my own Integraton of Variables method, that you can find in my researchgate profile. I am atraching for you related work writtten in Spanish lenguage, but could be clear for you. The Analysis and Synthesis Methodology and methods used you can find in English Lenguage in the  work. Analysis and Synthesis of Engineering Systems that you con find in my researchgate page.

Best wishes,

Jose Arzola

Hi, 

As mentioned by Jeremy, the "suitability" or optimality of the placement has to be expressed or modelled by you as an objective function, and then only GA would search for the combination of state variables that form the best combination to achieve that goal. 

For instance, in your case as you mentioned voltage profile is what is being monitored so the desired profile can be suitably modelled as the objective function. 

Hi,

The  multiple objective function must to include, nominal voltage and current, cos fi, deformation of the electric signal as a result of the presence of non linear elements, and other, by each subcircuit component and for the complete circuit. There are a group fo optimizatization algorithms that could be used, most of them could be included under the concept of the Integration of Variables Method that I mentioned in the previous mesage.

Best wishes,

Jose Arzola

hi Ashok

there are program for optimal placement of DG or capacitor with considering defferent objective.

you can go bellow link:

http://yarpiz.com 

Thank You very much Sir