The voltage angle at the REF bus is held constant at whatever value is in the VA column of the bus matrix for that bus. Often, it is bus 1 and the angle is set to zero, but this is not necessary.
-- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On May 1, 2013, at 5:14 PM, Aftognosia Aftognosia <[email protected]> wrote: > > Dear Dr Zimmerman, > > In an ACOPF, the Matpower seems to set Voltage_angle(bus1) = 0 . > However, this is not required - although it is not a mistake. Is it > compulsory to set this voltage_angle zero? > > Thank you > From: Ray Zimmerman <[email protected]> > To: MATPOWER discussion forum <[email protected]> > Sent: Wednesday, May 1, 2013 5:26 PM > Subject: Re: P_V curve > > MATPOWER does not compute the L-index directly. However, you may find the > contributed (i.e. unsupported) continuation power flow code useful for > finding PV curves. See cpf in Appendix E in the User's Manual. > > -- > Ray Zimmerman > Senior Research Associate > 419A Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > > On Apr 30, 2013, at 7:49 AM, Khirad Dhabhar <[email protected]> wrote: > >> Dear all >> >> In my project . Optimal placement of FACTS device i have run the ACOPF for >> an IEEE 30 bus and then using the Lambda values i have determined the bus at >> which to connect my facts device. Now i would like to find the voltage >> stability index for the base system and the system with the facts device. >> This is to show that the voltage stability index increases with the >> placement of FACTS device(I.E the L-index moves closer to 0). I downloaded a >> paper called "A comparison of voltage stability indices for placing Shunt >> FACTS controllers",by A.R.Phadke, S.K.Bansal and K.R.Niazi. In this paper >> they use the L index as a criteria. How can i calculate the L-index in >> matpower. >> >> thanks khirad >> >> >> -- >> Friendship is like a red rose with a green stem > > >
