ETAP Load Flow

ETAP is a wonderful tool, and in the hands of an electrical power engineer with a basic understanding of how a power system works without using the tool, it can provide quick access to accurate answers. However it will not replace thinking about what you are asking it to do, and will always provide answers of the form GIGO (Garbage In = Garbage Out), as you have proven.

Here's a hint: power systems like to be in balance; i.e., whatever power is produced must be consumed, whatever power is demanded must be generated. Does your input meet those criteria? If not then don't be surprised at the results that you were given. Perhaps you will have your doubts cleared if you try to solve the system by hand on a calculator, it's not that hard.

i know that. please suggest me:-

1) if a 3 bus power system have load of 400MW/250 MVAR. then one GENARATOR IS PRODUCING 800 MVAR AND ANOTHER CONSUMING (800-250)=550 MVAR IS IT POSSIBLE?

If "you know that" then you should know that you have created an unrealistic situation and are forcing the program to provide a solution that doesn't exist in the real world.

Are you a student or was this an interview question?

the generator of PV bus should produce 150 mvar(according to a worked out solution of a text book).............but it is producing more...........it is producing even 800 mvar if i give +Q limit 800 mvar. THATS WHY I AM SAYING I CANT CONTROL MVAR.....I SET SLACK BUS VOLTAGE 1.05 P.U AND PV BUS VOLTAGE AS 1.04 P.U............NOW PLEASE SUGGEST............

PLEASE GIVE ME TO THE POINT ANSWER INSTEAD OF WRITING UNNECESSARY COMMENTS

Then stop bloody-well SHOUTING!

How rude!

I suggest that you pack up your attitude and sense of entitlement and go here.