Dear Dr. Zimmerman
I am still expecting your help on how I can use MATPOWER to do my dispatch
problem.
Many thanks
>-----Original Message-----
>From: [email protected] [mailto:bounce-6075283-
>[email protected]] On Behalf Of Idris Musa
>Sent: 30 June 2010 21:02
>To: 'MATPOWER discussion forum'
>Subject: RE: MATPOWER Power flow
>
>Dear DR Zimmerman.
>I will take your second suggestion "Or you use some sort
>of constrained optimization where the limits are included explicitly as
>constraints".
>The following is my proposed criterion;
>-Real Power Loss Reduction
>- Voltage profile improvement at the buses
>With the optimisation constrained limits on Voltage, line flow and
>generation
>Just similar to the constrained on AC OPF.
>
>Thanks a lot
>Idris Musa.
>
>
>>-----Original Message-----
>>From: [email protected] [mailto:bounce-6074597-
>>[email protected]] On Behalf Of Ray Zimmerman
>>Sent: 30 June 2010 17:07
>>To: MATPOWER discussion forum
>>Subject: Re: MATPOWER Power flow
>>
>>Once again, a simple power flow does not take into account limits (flow,
>>generation or voltage). It simply computes the flows and generator
>>reactive power injections for a specified set of real power injections
>>and generator voltage setpoints. Either you manually adjust the inputs
>>(generator voltage setpoints and real power dispatch) to make sure you
>>don't violate limits (I don't know how to do this) or you use some sort
>>of constrained optimization where the limits are included explicitly as
>>constraints. The OPF is one such problem, where the objective function
>>is to minimize generation cost.
>>
>>The bottom line is that you need to select some criterion to specify
>how
>>the system is dispatched and how that dispatch is modified when you
>>introduce DG. With some reasonable assumptions, you can probably use
>>MATPOWER to do the dispatch. But you need to decide on the criterion
>>first.
>>
>>--
>>Ray Zimmerman
>>Senior Research Associate
>>211 Warren Hall, Cornell University, Ithaca, NY 14853
>>phone: (607) 255-9645
>>
>>
>>
>>On Jun 25, 2010, at 3:53 PM, Idris Musa wrote:
>>
>>> Dear Dr Zimmerman,
>>> In Distributed Generation(DG) siting and sizing, it's always required
>>that the optimal size and its location point (the bus which DG is to be
>>located)in the network should ensure that the following qualities of
>>that network are maintained.
>>> ALL REACTIVE POWER WITHIN LIMITS.
>>> ALL CURRENT FLOWS WITHIN LIMITS.
>>> ALL REAL POWER FLOWS WITHIN LIMITS.
>>> ALL APPARENT POWER FLOWS WITHIN LIMITS.
>>> This means location of DG should not cause any of the above problem.
>>My thinking is that how do we enforce this in power flow analysis of
>>MATPOWER. I am not thinking of running OPF. I only want to use power
>>flow to determined the steady state of the network after the placement
>>of optimal DG size in its Optimal location that gives the best loss
>>reduction. I thought they could be way of enforcing this violation so
>>that one can have final summary of all the violations if any or how fix
>>it if any. Since the violation checked by running the power flow all
>>available sizes and location using random search based on some search
>>techniques like PSO,GA etc.
>>> May be I don't understand your explanation very well but that's what
>>am targeting at.
>>>
>>> Many thanks
>>> Idris Musa
>>>
>>>
>>>> -----Original Message-----
>>>> From: [email protected] [mailto:bounce-
>>6063748-
>>>> [email protected]] On Behalf Of Ray Zimmerman
>>>> Sent: 25 June 2010 19:09
>>>> To: MATPOWER discussion forum
>>>> Subject: Re: MATPOWER Power flow
>>>>
>>>> Standard power flow computes flows for a specified real power
>>dispatch
>>>> pattern and specified generator voltage setpoints. This can result
>in
>>>> voltage limit, branch flow limit and gen reactive limit violations.
>>If
>>>> you want these limits to be respected as well, you have to decide
>>which
>>>> of your power flow inputs you are willing to free up in order to fix
>>the
>>>> violation. If you can tell me that, I might be able to suggest a way
>>to
>>>> do it. I suspect you'll probably end up wanting to use an OPF with
>>>> tightened constraints on certain variables.
>>>>
>>>> --
>>>> Ray Zimmerman
>>>> Senior Research Associate
>>>> 211 Warren Hall, Cornell University, Ithaca, NY 14853
>>>> phone: (607) 255-9645
>>>>
>>>>
>>>>
>>>> On Jun 25, 2010, at 11:13 AM, Idris Musa wrote:
>>>>
>>>>> Dear all,
>>>>> I am working on Distributed Generation and want to use MATPOWER for
>>>> Power flow analysis subjects to the following constraints; Voltage
>>>> limits, Branch flow limits (current limits)
>>>>> How do I enforce this constraints to run the power flow.
>>>>>
>>>>> Regards
>>>>> Idris
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>>
>>
>>
>
>
