Hmmm … I thought I fixed such an issue in version 5 of MATPOWER. Are you using
the latest version? If so, can you send me (off-list) the case and I’ll see if
I can track down the problem.
Ray
> On Mar 24, 2016, at 9:48 PM, Bai, Wenlei <[email protected]> wrote:
>
> Thank you Ray, It helped.
> But When I try to run load flow with enfore_Q_ lims, it has such error:
>
> Attempted to access pv(1); index out of bounds because numel(pv)=0.
>
> Error in bustypes (line 61)
> ref = pv(1); %% use the first PV bus
>
> Error in runpf (line 291)
> [ref, pv, pq] = bustypes(bus, gen);
>
> Is this possiblely because all PV buseshave been converted to PQ bus? Do you
> have suggestion to fix it?
> Thanks
>
> Wenlei
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Ray Zimmerman
> Sent: Thursday, March 24, 2016 2:59 PM
> To: MATPOWER discussion forum <[email protected]>
> Subject: Re: PV bus generator reactive power exceeding limits
>
> MATPOWER does not return this information explicitly (though it does print it
> if the verbose option is on. However, you can find it by comparing the
> BUS_TYPE column of the bus matrix before and after solving the power flow.
>
>>> mpc = loadcase('case118');
>>> results = runpf(mpc, mpopt);
>
> MATPOWER Version 6.0-dev, 14-Mar-2016 -- AC Power Flow (Newton)
>
> Newton's method power flow converged in 3 iterations.
> Gen 46 at upper Q limit, converting to PQ bus
> Gen 9 at lower Q limit, converting to PQ bus
> Gen 15 at lower Q limit, converting to PQ bus
> Gen 16 at lower Q limit, converting to PQ bus
> Gen 43 at lower Q limit, converting to PQ bus
> Gen 48 at lower Q limit, converting to PQ bus
>
> Newton's method power flow converged in 3 iterations.
>>> k = find(mpc.bus(:, BUS_TYPE) == PV & results.bus(:, BUS_TYPE) == PQ);
>>> mpc.bus(k, BUS_I)
>
> ans =
>
> 19
> 32
> 34
> 92
> 103
> 105
>
>
> Hope this helps,
>
> Ray
>
>
> On Mar 24, 2016, at 11:59 AM, Bai, Wenlei
> <[email protected]<mailto:[email protected]>> wrote:
>
> Hi Jose,
> Thanks for reminder. I didn’t know this option before. It solved my question.
> So how do we know which PV bus, is there is any, is converted to PQ bus after
> using ENFORCE_Q_LIMS option 1 or 2?
>
> Wenlei
>
> From:
> [email protected]<mailto:[email protected]>
> [mailto:[email protected]] On Behalf Of Jose Luis
> Marin
> Sent: Thursday, March 24, 2016 3:57 AM
> To: MATPOWER discussion forum
> <[email protected]<mailto:[email protected]>>
> Subject: Re: PV bus generator reactive power exceeding limits
>
>
> Quick question, did you use the option pf.enforce_q_lims? (see Table C-2 in
> the manual)
>
> Also, be aware that options 1 and 2 may yield different solutions, in general.
>
> --
> Jose L. Marin
> Grupo AIA
>
>
>
> On Thu, Mar 24, 2016 at 6:08 AM, Bai, Wenlei
> <[email protected]<mailto:[email protected]>> wrote:
> Dear Ray,
> I’ve encountered a situation: the real power and voltage are specified in PV
> buses, and as I run the load flow on modified 30 bus case, somehow the
> reactive power of PV bus are exceeding the limits. Some even exceed the
> negative limits.
> The thing is the reactive power demand of the load and system isn’t large.
> Can you see what might be wrong?
>
> Blessings,
> Wenlei
>
>
> --_000_BLUPR06MB1747B4FA46E56AD48C12540F82830BLUPR06MB1747namp_
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> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thank
> you Ray, It helped.<o:p></o:p></span></p>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">But
> When I try to run load flow with enfore_Q_ lims, it has such
> error:<o:p></o:p></span></p>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">Attempted
> to access pv(1); index out of bounds because
> numel(pv)=0.<o:p></o:p></span></p>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red"><o:p> </o:p></span></p>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">Error
> in bustypes (line 61)<o:p></o:p></span></p>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">
> ref =
> pv(1);
> %% use the first PV bus<o:p></o:p></span></p>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red"><o:p> </o:p></span></p>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">Error
> in runpf (line 291)<o:p></o:p></span></p>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:red">
> [ref, pv, pq] = bustypes(bus, gen);<o:p></o:p></span></p>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Is
> this possiblely because all PV buseshave been converted to PQ bus? Do you
> have suggestion to fix it?<o:p></o:p></span></p>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks<o:p></o:p></span></p>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Wenlei<o:p></o:p></span></p>
> <div>
> <div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in
> 0in">
> <p class="MsoNormal"><b><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif">
> [email protected]
> [mailto:[email protected]]
> <b>On Behalf Of </b>Ray Zimmerman<br>
> <b>Sent:</b> Thursday, March 24, 2016 2:59 PM<br>
> <b>To:</b> MATPOWER discussion forum <[email protected]><br>
> <b>Subject:</b> Re: PV bus generator reactive power exceeding
> limits<o:p></o:p></span></p>
> </div>
> </div>
> <p class="MsoNormal"><o:p> </o:p></p>
> <div>
> <p class="MsoNormal">MATPOWER does not return this information explicitly
> (though it does print it if the verbose option is on. However, you can find
> it by comparing the BUS_TYPE column of the bus matrix before and after
> solving the power flow.<o:p></o:p></p>
> </div>
> <div>
> <p class="MsoNormal"><o:p> </o:p></p>
> </div>
> <div>
> <div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:7.5pt;font-family:Courier">>> mpc =
> loadcase('case118'); </span><span
> style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:7.5pt;font-family:Courier">>> results = runpf(mpc,
> mpopt);</span><span style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:7.5pt"><o:p> </o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:7.5pt;font-family:Courier">MATPOWER Version 6.0-dev,
> 14-Mar-2016 -- AC Power Flow (Newton)</span><span
> style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:7.5pt"><o:p> </o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:7.5pt;font-family:Courier">Newton's method power flow
> converged in 3 iterations.</span><span
> style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span style="font-size:7.5pt;font-family:Courier">Gen 46
> at upper Q limit, converting to PQ bus</span><span
> style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span style="font-size:7.5pt;font-family:Courier">Gen 9
> at lower Q limit, converting to PQ bus</span><span
> style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span style="font-size:7.5pt;font-family:Courier">Gen 15
> at lower Q limit, converting to PQ bus</span><span
> style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span style="font-size:7.5pt;font-family:Courier">Gen 16
> at lower Q limit, converting to PQ bus</span><span
> style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span style="font-size:7.5pt;font-family:Courier">Gen 43
> at lower Q limit, converting to PQ bus</span><span
> style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span style="font-size:7.5pt;font-family:Courier">Gen 48
> at lower Q limit, converting to PQ bus</span><span
> style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:7.5pt"><o:p> </o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:7.5pt;font-family:Courier">Newton's method power flow
> converged in 3 iterations.</span><span
> style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:7.5pt;font-family:Courier">>> k = find(mpc.bus(:,
> BUS_TYPE) == PV & results.bus(:, BUS_TYPE) == PQ);</span><span
> style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:7.5pt;font-family:Courier">>> mpc.bus(k, BUS_I)
>
>
> </span><span
> style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:7.5pt"><o:p> </o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span style="font-size:7.5pt;font-family:Courier">ans
> =</span><span style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:7.5pt"><o:p> </o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span style="font-size:7.5pt;font-family:Courier">
> 19</span><span style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span style="font-size:7.5pt;font-family:Courier">
> 32</span><span style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span style="font-size:7.5pt;font-family:Courier">
> 34</span><span style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span style="font-size:7.5pt;font-family:Courier">
> 92</span><span style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:7.5pt;font-family:Courier"> 103</span><span
> style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:7.5pt;font-family:Courier"> 105</span><span
> style="font-size:7.5pt"><o:p></o:p></span></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:7.5pt;font-family:"Menlo",serif"><br>
> <br>
> <o:p></o:p></span></p>
> </div>
> </div>
> </div>
> <div>
> <p class="MsoNormal">Hope this helps,<o:p></o:p></p>
> </div>
> <div>
> <p class="MsoNormal"><o:p> </o:p></p>
> </div>
> <div>
> <p class="MsoNormal"> Ray<o:p></o:p></p>
> </div>
> <div>
> <p class="MsoNormal"><o:p> </o:p></p>
> </div>
> <p class="MsoNormal"><o:p> </o:p></p>
> <div>
> <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
> <div>
> <p class="MsoNormal">On Mar 24, 2016, at 11:59 AM, Bai, Wenlei <<a
> href="mailto:[email protected]";>[email protected]</a>>
> wrote:<o:p></o:p></p>
> </div>
> <p class="MsoNormal"><o:p> </o:p></p>
> <div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi
> Jose,</span><o:p></o:p></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks
> for reminder. I didn’t know this option before. It solved my
> question.</span><o:p></o:p></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">So
> how do we know which PV bus, is there is any, is converted to PQ bus after
> using ENFORCE_Q_LIMS option 1 or 2?</span><o:p></o:p></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Wenlei</span><o:p></o:p></p>
> </div>
> <div>
> <p class="MsoNormal"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
> </div>
> <div>
> <p class="MsoNormal"><b><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span
> class="apple-converted-space"><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></span><span
> style="font-size:11.0pt;font-family:"Calibri",sans-serif"><a
> href="mailto:[email protected]";><span
> style="color:purple">[email protected]</span></a><span
> class="apple-converted-space"> </span>[<a
> href="mailto:[email protected]";><span
> style="color:purple">mailto:[email protected]</span></a>]<span
> class="apple-converted-space"> </span><b>On
> Behalf Of<span class="apple-converted-space"> </span></b>Jose Luis
> Marin<br>
> <b>Sent:</b><span class="apple-converted-space"> </span>Thursday, March
> 24, 2016 3:57 AM<br>
> <b>To:</b><span class="apple-converted-space"> </span>MATPOWER
> discussion forum <<a href="mailto:[email protected]";><span
> style="color:purple">[email protected]</span></a>><br>
> <b>Subject:</b><span class="apple-converted-space"> </span>Re: PV bus
> generator reactive power exceeding limits</span><o:p></o:p></p>
> </div>
> <div>
> <p class="MsoNormal"> <o:p></o:p></p>
> </div>
> <div>
> <div>
> <div>
> <p class="MsoNormal"> <o:p></o:p></p>
> </div>
> </div>
> <div>
> <p class="MsoNormal">Quick question, did you use the option
> pf.enforce_q_lims? (see Table C-2 in the manual)<br>
> <br>
> Also, be aware that options 1 and 2 may yield different solutions, in
> general.<o:p></o:p></p>
> </div>
> <div>
> <div>
> <p class="MsoNormal"> <o:p></o:p></p>
> </div>
> <div>
> <div>
> <div>
> <div>
> <div>
> <p class="MsoNormal">--<span
> class="apple-converted-space"> </span><o:p></o:p></p>
> </div>
> </div>
> <div>
> <p class="MsoNormal">Jose L. Marin<o:p></o:p></p>
> </div>
> </div>
> <div>
> <div>
> <p class="MsoNormal">Grupo AIA<o:p></o:p></p>
> </div>
> </div>
> <div>
> <p class="MsoNormal" style="margin-bottom:12.0pt"><br>
> <br>
> <br>
> <o:p></o:p></p>
> </div>
> </div>
> </div>
> <div>
> <div>
> <p class="MsoNormal">On Thu, Mar 24, 2016 at 6:08 AM, Bai, Wenlei <<a
> href="mailto:[email protected]"; target="_blank"><span
> style="color:purple">[email protected]</span></a>>
> wrote:<o:p></o:p></p>
> </div>
> <blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in
> 0in 0in
> 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt">
> <div>
> <div>
> <div>
> <p class="MsoNormal">Dear Ray,<o:p></o:p></p>
> </div>
> <div>
> <p class="MsoNormal">I’ve encountered a situation: the real power and voltage
> are specified in PV buses, and as I run the load flow on modified 30 bus
> case, somehow the reactive power of PV bus are exceeding the limits. Some
> even exceed the negative limits.<o:p></o:p></p>
> </div>
> <div>
> <p class="MsoNormal">The thing is the reactive power demand of the load and
> system isn’t large. Can you see what might be wrong?<o:p></o:p></p>
> </div>
> <div>
> <p class="MsoNormal"> <o:p></o:p></p>
> </div>
> <div>
> <p class="MsoNormal">Blessings,<o:p></o:p></p>
> </div>
> <div>
> <p class="MsoNormal">Wenlei<o:p></o:p></p>
> </div>
> </div>
> </div>
> </blockquote>
> </div>
> </div>
> </div>
> </div>
> </blockquote>
> </div>
> <p class="MsoNormal"><o:p> </o:p></p>
> </div>
> </body>
> </html>
>
> --
