You can make an OPF mimic a PF by relaxing the constraints (line flow, voltage constraints) and setting the cost function to zero. (by setting values in mpc.gencost = 0)
Shri From: siddique tomal <[email protected]<mailto:[email protected]>> Reply-To: MATPOWER discussion forum <[email protected]<mailto:[email protected]>> Date: Friday, January 27, 2017 at 7:26 AM To: MATPOWER discussion forum <[email protected]<mailto:[email protected]>> Subject: Re: AW: Bus Voltage Constraints Dear Leon Thurber, Thanks again . the cause behind I don't want to use OPF is I want to optimize the cost funtion by my own developed program. Here I just need simple load flow to study the developed program. Thanks On Jan 27, 2017 7:21 PM, "Leon Thurner" <[email protected]<mailto:[email protected]>> wrote: Dear Siddique Tomal, again, that sounds exactly like a problem that one would solve with an optimal power flow. The OPF allows yout to define costs for active/reactive power, constraints for vmin/vmax and then to find the network state that minimizes the cost function while complying with all constraints. What is the reason you don’t want to or can’t use an OPF for this? Best Leon Von:[email protected]<mailto:[email protected]> [mailto:[email protected]<mailto:[email protected]>] Im Auftrag von siddique tomal Gesendet: Freitag, 27. Januar 2017 13:57 An: MATPOWER discussion forum <[email protected]<mailto:[email protected]>> Betreff: Re: Bus Voltage Constraints Dear Leon Thurner, Thanks for the reply. Actually in my work the active and reactive wont be fixed. I will change the value of both power more specifically the reactive power frequently to have a best value my cost function. And as the power is not fixed here so bus voltage is changeable. And here i want to put a limit for the change of bus voltage. Hope you understand and help me to find a way to solve. Thanks On Fri, Jan 27, 2017 at 6:46 PM, Leon Thurner <[email protected]<mailto:[email protected]>> wrote: Dear Siddique Tomal, having constraints for bus voltages is only possible if you have flexibilities that allow you to keep those constraints. In a normal power flow you do not have these flexibilties, since active and reactive power is fixed at most buses. What you ask for is only possible with an OPF and is in fact exactly what the OPF is designed to do. Regards Leon Von:[email protected]<mailto:[email protected]> [mailto:[email protected]<mailto:[email protected]>] Im Auftrag von siddique tomal Gesendet: Freitag, 27. Januar 2017 13:33 An: [email protected]<mailto:[email protected]> Betreff: Bus Voltage Constraints Dear all, i have a query about bus voltage constraints in normal power flow. I want to set a limit for every bus voltage (+-5%). So I’m asking help regarding this fact. It is just like 'vmax' and 'vmin' column in bus data matrix works only in optimal power flow. but i need this feature for normal power flow. Thanks
