You haven't said which bus is your slack bus. Can I assume that it would be the one labeled GSP? I don't see a slack generator at that bus. Is the OLTC the *only* voltage control you have in the network? Is the voltage at GSP fixed?
-- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Feb 10, 2012, at 2:51 PM, Silvio Miceli wrote: > I want to have an OLTC at slack bus only in order to control centrally the > network voltage (active network) as below figure. How can I compare the > results with and without OLTC? with changing tap ratio or with changing > voltage setpoints? > > <image.png> > > Best Wishes > > Silvio Miceli > > > On Fri, Feb 10, 2012 at 20:43, Ray Zimmerman <[email protected]> wrote: > In order to understand clearly what you are trying to compare, I would need > to see the network topology. > > But, it both cases include the OLTC in the topology and in one case you are > modifying the tap ratio to control voltage and in the other you are simply > modifying the generator voltage setpoints, then the two solutions will not be > equivalent. > > -- > Ray Zimmerman > Senior Research Associate > 419A Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > > On Feb 10, 2012, at 10:46 AM, Silvio Miceli wrote: > >> Dear Ray, >> >> As far as I know, taking into account the voltage at slack bus as >> optimization variable is equal to have an OLTC. So, how can I compare the >> results with and without voltage control at slack? Can it be done either by >> changing the tap ratio or voltage limits? >> Best Wishes >> >> Silvio Miceli >> >> >> On Thu, Feb 9, 2012 at 18:57, Silvio Miceli <[email protected]> wrote: >> Dear Ray, >> >> 1. Can I say MATPOWER's OPF considers the power factor angle of generators >> as optimization variable? If not, how can I consider as optimization >> variable? >> >> 2. Also, according to one of your replies to a post with regards to >> considering the slack bus voltage as optimization variable, why you want to >> implement OLTC in MATPOWER? In my idea, considering the slack bus as >> optimization variable is equal to have an OLTC and consequently considering >> the secondary voltage as optimization variable. Because usually the OLTC is >> used in order to control the voltage of slack bus and in MATPOWER is already >> considered as optimization variable. If I am not right, please let me know? >> >> Best Wishes >> >> Silvio >> >> >> >> On Wed, Feb 8, 2012 at 17:47, Ray Zimmerman <[email protected]> wrote: >> On Feb 8, 2012, at 10:01 AM, Silvio Miceli wrote: >> >>> 1. What kind of generator has been taken into account in MATPOWER in >>> Section 5.4.3 of MANUAL in order to consider the capability curve? >> >> It is simply intended to be a piecewise linear approximation to the kind of >> capability curve exhibited by many types of conventional generators, such as >> this one from Figure 2 in [1]. >> >>> 2. I want to minimize losses instead of maximizing social welfare >>> considering offers and bids. How can I do it in MATPOWER? >> >> The answer to this one is readily available in the list archives ... e.g. >> http://www.mail-archive.com/[email protected]/msg00817.html >> >>> 3. How can I maximize profit for generators in MATPOWER instead of >>> maximizing Social welfare? >>> Also, by which formula I can obtain profits (for generators), revenue and >>> cost in MATPOWER? Could you please address it? >> >> I'm not aware of a method to maximize profits, since that would involve an >> objective that is a function of price, a very unconventional type of >> optimization problem. You can compute revenue directly as the product of >> quantity and price, and the cost is available in the dispatch matrix >> returned by runmarket. See help idx_disp for a description of each column of >> the dispatch matrix. >> >> - Ray >> >> [1] >> http://www.hydroworld.com/index/display/article-display/353952/articles/hydro-review/volume-28/issue-2/feature-articles/system-protection/coordinating-generator-protection-and-controls-an-overview.html >> >> -- >> Ray Zimmerman >> Senior Research Associate >> 419A Warren Hall, Cornell University, Ithaca, NY 14853 >> phone: (607) 255-9645 >> >> >> >> > >
