On Jul 23, 2013, at 9:42 AM, spyros gian <sp.g...@hotmail.com> wrote:
> Dear Dr Zimmerman, > > Running an OPF in matpower means that > > 1. Bus types play no role (eg slack, PV, PQ etc) Yes. > 2. All values for Real Power generation and reactive power generation are > unknown Yes. > 3. All values for bus_voltages and voltage phase angles in buses, are unknown > as well The voltage angle of the reference bus is fixed and set to 0. > 4. As a result, all values for real and reactive power flows are unknown. Yes. > 5. Losses are unknown. Yes. > > What is known : > 1. The resistance, reactance, admittance per unit / per conductor > 2. Values for Real and Reactive demand at each bus > 3. Limits on voltage magnitude , limits on real and reactive power generation > 4. MVA limits on each line > 5. Fuel cost for each generator. Yes for all > > So my question is > a. Are the above correct for matpower ? > b. Since matpower uses a non-linear optimisation, is the result a local > minimum or a global minimum? > (for the case of a cost-minimization OPF) ? i.e. the values for voltages, > reactive powers etc, are > globally optimum or perhaps other optimum values for all the unknown > quantities exist ? I believe most of the optimization tools, such as fmincon in Matlab, find a local minimum. Shri > > Thank you, > Spyros Gian > >
