Received: from CPWP016G.ercot.com ([10.3.16.106]) by CPWP016I.ercot.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 13 Nov 2008 17:35:42 -0600 From: ERCOT Client Relations <[log in to unmask]> To: "[log in to unmask]" <[log in to unmask]> CC: 1 ERCOT Client Service Reps <[log in to unmask]> Content-Class: urn:content-classes:message Date: Thu, 13 Nov 2008 17:35:40 -0600 Subject: M-D111308-01 Protocol Interpretation Request on Reactive Power Capability Requirements Thread-Topic: M-D111308-01 Protocol Interpretation Request on Reactive Power Capability Requirements Thread-Index: AclF6IoNdC5WTKe8QBGG/uah90Zo3w== Message-ID: <[log in to unmask]> X-MS-Has-Attach: X-Auto-Response-Suppress: OOF, AutoReply X-MS-Exchange-Organization-SCL: -1 X-MS-TNEF-Correlator: Return-Path: <[log in to unmask]> x-originalarrivaltime: 13 Nov 2008 23:35:42.0136 (UTC) FILETIME=[8ADEDB80:01C945E8] x-mimeole: Produced By Microsoft Exchange V6.5 Content-Type: multipart/alternative; boundary="_000_6F0027746577F94DA16FD8D84F875DF6016DF919CPWP016Gercotco_" MIME-Version: 1.0 --_000_6F0027746577F94DA16FD8D84F875DF6016DF919CPWP016Gercotco_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable NOTICE DATE: November 13, 2008 NOTICE TYPE: M-D111308-01 Legal SHORT DESCRIPTION: Protocol Interpretation Request on Reactive Power Capab= ility Requirements INTENDED AUDIENCE: All ERCOT Market Participants LONG DESCRIPTION: An Entity has submitted to ERCOT a Protocol Clarificatio= n/Interpretation Request (PIR) regarding subsection (2) in Protocol Section= 6.5.7.1, Generation Resources Required to Provide VSS Installed Reactive C= apability, and subsection (5) in Protocol Section 6.7.6, Deployment of Volt= age Support Service. Specifically, the PIR seeks clarification on issues s= urrounding Reactive Power capability requirements. ERCOT provides the following guidance to the questions submitted by the Ent= ity. 1. Clarify if the power factor capability of +/- 0.95 is required at a= ll levels of generation. Yes. Protocol Section 6.5.7.1(2) sets the Reactive Power capability requir= ement for all Generation Resources that provide Voltage Support Service (VS= S). The section states that a Generation Resource is required to have and = maintain an Unit Reactive Limit (URL) with a power factor capability of +/-= 0.95, determined at its net max output to the transmission system, and tha= t this capability must be maintained - no exceptions are provided. 2. Clarify the minimum reactive capability requirements at lower level= s of generation and exactly how this is calculated. There is no minimum Reactive Power capability requirement. The Reactive Po= wer requirement is set forth in Protocol Section 6.5.7.1, Generation Resour= ces Required to Provide VSS Installed Reactive Capability. Specifically, s= ubsection (2) states: Generation Resources required to provide VSS except as noted below in items= (3) or (4), shall have and maintain a URL which has an over-excited (laggi= ng) power factor capability of ninety-five hundredths (0.95) or less and an= under-excited (leading) power factor capability of ninety-five hundredths = (0.95) or less, both determined at the generating unit's maximum net power = to be supplied to the transmission grid and at the transmission system Volt= age Profile established by ERCOT, and both measured at the point of interco= nnection to the TDSP. As described in the response to Question 1, Protocol Section 6.5.7.1(2) sta= tes that a Generation Resource must provide the MVAR requirement (+/- 0.95 = power factor) calculated at the maximum net output to the ERCOT Transmissio= n Grid, and that level must be available at all MW output levels. ERCOT, or TSPs designated by ERCOT, have the right to instruct Generation R= esources to make adjustments for voltage support within the URL capacity li= mits. However, dispatching a Generation Resource within a URL range is the= right of the system operator, and is unrelated to, and does not affect a G= eneration Resource's obligation to maintain a power factor capability of +/= - 0.95 when dispatched by ERCOT or TSPs. Protocol Section 6.7.6(5) confirms the power factor capability requirement = in Protocol Section 6.5.7.1(2). Specifically, the first sentence reads: At all times a Generation Resource unit required to provide VSS is On-Line,= the URL must be available for utilization at the generating unit's continu= ous rated active power output, and Reactive Power up to the unit's operatin= g capability must be available for utilization at lower active power output= levels. Therefore, under this Protocol as well, the power factor capability require= ment does not decrease with decreasing generation output. A Generation Res= ource must be able to maintain the MVAR capability requirement as described= in Protocol Section 6.5.7.1(2) even with decreasing power output. The second sentence in Protocol Section 6.7.6(5) states: In no event shall the Reactive Power available be less than the required in= stalled reactive capability multiplied by the ratio of the lower active pow= er output to the generating unit's continuous rated active power output, an= d any Reactive Power available for utilization must be fully deployed to su= pport system voltage upon request by ERCOT, or a TSP. This sentence does not conflict with the power factor capability requiremen= t in the first sentence or Protocol Section 6.5.7.1(2) by establishing a mi= nimum reactive capability requirement. In fact, as described above, the re= quirement in 6.5.7.1(2) is confirmed in the first sentence of this section.= The language in the second sentence of this section merely accounts for s= ituations in which a Generation Resource encounters equipment-related issue= s or other unforeseen circumstances that may cause the Reactive Power capab= ility to be less than the requirement in Protocol Section 6.5.7.1(2). If t= he Reactive Power is less than the calculation described in the second sent= ence, then the Generation Resource's ability to support system voltage may = jeopardize the reliability of the ERCOT Transmission Grid. 3. Clarify the definitions for "generating unit's maximum net power" a= s indicated in Protocol Section 6.5.7.1(2) and "the generating unit's conti= nuous rated active power output" as indicated in Protocol Section 6.7.6(5). Both references above refer to the Net High Capability Limit provided by th= e Generation Resource to ERCOT through resource registration. Net High Cap= ability Limit is the net high MW generation output based on the rating of p= lant equipment minus plant Load. CONTACT: If you have any questions, please contact your ERCOT Account Mana= ger. You may also call the general ERCOT Client Services phone number at (5= 12) 248-3900 or contact ERCOT Client Services via e-mail at ClientRelations= @ercot.com<mailto:[log in to unmask]>. If you are receiving e-mail from an ERCOT distribution list that you no lon= ger wish to receive, please follow this link in order to unsubscribe from t= his list: http://lists.ercot.com<http://lists.ercot.com/>. sg --_000_6F0027746577F94DA16FD8D84F875DF6016DF919CPWP016Gercotco_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-micr= osoft-com:office:office" xmlns:w=3D"urn:schemas-microsoft-com:office:word" = xmlns:x=3D"urn:schemas-microsoft-com:office:excel" xmlns:p=3D"urn:schemas-m= icrosoft-com:office:powerpoint" xmlns:a=3D"urn:schemas-microsoft-com:office= :access" xmlns:dt=3D"uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:s=3D"= uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:rs=3D"urn:schemas-microsof= t-com:rowset" xmlns:z=3D"#RowsetSchema" xmlns:b=3D"urn:schemas-microsoft-co= m:office:publisher" xmlns:ss=3D"urn:schemas-microsoft-com:office:spreadshee= t" xmlns:c=3D"urn:schemas-microsoft-com:office:component:spreadsheet" xmlns= :odc=3D"urn:schemas-microsoft-com:office:odc" xmlns:oa=3D"urn:schemas-micro= soft-com:office:activation" xmlns:html=3D"http://www.w3.org/TR/REC-html40" = xmlns:q=3D"http://schemas.xmlsoap.org/soap/envelope/" xmlns:D=3D"DAV:" xmln= s:x2=3D"http://schemas.microsoft.com/office/excel/2003/xml" xmlns:ois=3D"ht= tp://schemas.microsoft.com/sharepoint/soap/ois/" xmlns:dir=3D"http://schema= s.microsoft.com/sharepoint/soap/directory/" xmlns:ds=3D"http://www.w3.org/2= 000/09/xmldsig#" xmlns:dsp=3D"http://schemas.microsoft.com/sharepoint/dsp" = xmlns:udc=3D"http://schemas.microsoft.com/data/udc" xmlns:xsd=3D"http://www= .w3.org/2001/XMLSchema" xmlns:sub=3D"http://schemas.microsoft.com/sharepoin= t/soap/2002/1/alerts/" xmlns:ec=3D"http://www.w3.org/2001/04/xmlenc#" xmlns= :sp=3D"http://schemas.microsoft.com/sharepoint/" xmlns:sps=3D"http://schema= s.microsoft.com/sharepoint/soap/" xmlns:xsi=3D"http://www.w3.org/2001/XMLSc= hema-instance" xmlns:udcxf=3D"http://schemas.microsoft.com/data/udc/xmlfile= " xmlns:st=3D"" xmlns=3D"http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"= > <meta name=3D"Generator" content=3D"Microsoft Word 11 (filtered medium)"> <!--[if !mso]> <style> v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} </style> <![endif]--><style> <!-- /* Font Definitions */ @font-face {font-family:Verdana; panose-1:2 11 6 4 3 5 4 4 2 4;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {margin-top:0in; margin-right:0in; margin-bottom:12.0pt; margin-left:0in; font-size:12.0pt; font-family:Arial;} p.MsoHeader, li.MsoHeader, div.MsoHeader {margin-top:0in; margin-right:0in; margin-bottom:12.0pt; margin-left:0in; font-size:12.0pt; font-family:Arial;} a:link, span.MsoHyperlink {color:blue; text-decoration:underline;} a:visited, span.MsoHyperlinkFollowed {color:purple; text-decoration:underline;} span.EmailStyle17 {mso-style-type:personal-compose; font-family:Arial; color:windowtext;} span.StyleBold {font-family:Arial; font-weight:bold;} p.Char3, li.Char3, div.Char3 {margin-top:0in; margin-right:0in; margin-bottom:8.0pt; margin-left:0in; line-height:12.0pt; font-size:8.0pt; font-family:Verdana;} /* Page Definitions */ @page Section1 {size:8.5in 11.0in; margin:1.0in 1.25in 1.0in 1.25in;} div.Section1 {page:Section1;} /* List Definitions */ @list l0 {mso-list-id:2014842449; mso-list-type:hybrid; mso-list-template-ids:-1645959948 67698703 67698713 67698715 67698703 6769= 8713 67698715 67698703 67698713 67698715;} @list l0:level1 {mso-level-tab-stop:.5in; mso-level-number-position:left; text-indent:-.25in;} ol {margin-bottom:0in;} ul {margin-bottom:0in;} --> </style> </head> <body lang=3D"EN-US" link=3D"blue" vlink=3D"purple"> <div class=3D"Section1"> <p class=3D"MsoNormal"><span class=3D"StyleBold"><b><font size=3D"3" face= =3D"Arial"><span style=3D"font-size:12.0pt">NOTICE DATE:</span></font></b><= /span> November 13, 2008 <o:p></o:p></p> <p class=3D"MsoNormal"><span class=3D"StyleBold"><b><font size=3D"3" face= =3D"Arial"><span style=3D"font-size:12.0pt">NOTICE TYPE:</span></font></b><= /span> M-D111308-01 Legal <o:p></o:p></p> <p class=3D"MsoNormal"><span class=3D"StyleBold"><b><font size=3D"3" face= =3D"Arial"><span style=3D"font-size:12.0pt">SHORT DESCRIPTION:</span></font= ></b></span> Protocol Interpretation Request on Reactive Power Capabi= lity Requirements<o:p></o:p></p> <p class=3D"MsoNormal"><span class=3D"StyleBold"><b><font size=3D"3" face= =3D"Arial"><span style=3D"font-size:12.0pt">INTENDED AUDIENCE:</span></font= ></b></span> All ERCOT Market Participants<o:p></o:p></p> <p class=3D"MsoNormal" style=3D"margin-bottom:0in;margin-bottom:.0001pt;tex= t-align: justify"> <span class=3D"StyleBold"><b><font size=3D"3" face=3D"Arial"><span style=3D= "font-size:12.0pt">LONG DESCRIPTION:</span></font></b></span> An Enti= ty has submitted to ERCOT a Protocol Clarification/Interpretation Request (= PIR) regarding subsection (2) in Protocol Section 6.5.7.1, Generation Resources Required to Provide VSS Installed Reactive C= apability, and subsection (5) in Protocol Section 6.7.6, Deployment of Volt= age Support Service. Specifically, the PIR seeks clarification on iss= ues surrounding Reactive Power capability requirements.<o:p></o:p></p> <p class=3D"MsoNormal" style=3D"margin-bottom:0in;margin-bottom:.0001pt;tex= t-align: justify"> <font size=3D"3" face=3D"Arial"><span style=3D"font-size:12.0pt"> <o:= p></o:p></span></font></p> <p class=3D"MsoNormal" style=3D"text-align:justify"><font size=3D"3" face= =3D"Arial"><span style=3D"font-size:12.0pt">ERCOT provides the following gu= idance to the questions submitted by the Entity.<o:p></o:p></span></font></= p> <ol style=3D"margin-top:0in" start=3D"1" type=3D"1"> <li class=3D"MsoNormal" style=3D"margin-bottom:0in;margin-bottom:.0001pt;te= xt-align: justify;mso-list:l0 level1 lfo1"> <b><font size=3D"3" face=3D"Arial"><span style=3D"font-size:12.0pt;font-wei= ght:bold">Clarify if the power factor capability of +/- 0.95 is require= d at all levels of generation.<o:p></o:p></span></font></b> </li></ol> <p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;mar= gin-bottom: 0in;margin-left:.25in;margin-bottom:.0001pt;text-align:justify"> <b><font size=3D"3" face=3D"Arial"><span style=3D"font-size:12.0pt;font-wei= ght:bold"><o:p> </o:p></span></font></b></p> <p class=3D"MsoNormal" style=3D"text-align:justify"><font size=3D"3" face= =3D"Arial"><span style=3D"font-size:12.0pt">Yes. Protocol Section 6.5= .7.1(2) sets the Reactive Power capability requirement for all Generation R= esources that provide Voltage Support Service (VSS). The section states that a Generation Resource is required to have and main= tain an Unit Reactive Limit (URL) with a power factor capability of +/-= 0.95, determined at its net max output to the transmission system, and tha= t this capability must be maintained – no exceptions are provided. <o:p></o:p></span></font></p> <ol style=3D"margin-top:0in" start=3D"2" type=3D"1"> <li class=3D"MsoNormal" style=3D"margin-bottom:0in;margin-bottom:.0001pt;te= xt-align: justify;mso-list:l0 level1 lfo1"> <b><font size=3D"3" face=3D"Arial"><span style=3D"font-size:12.0pt;font-wei= ght:bold">Clarify the minimum reactive capability requirements at lower lev= els of generation and exactly how this is calculated.<o:p></o:p></span></fo= nt></b> </li></ol> <p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;mar= gin-bottom: 0in;margin-left:.25in;margin-bottom:.0001pt;text-align:justify"> <b><font size=3D"3" face=3D"Arial"><span style=3D"font-size:12.0pt;font-wei= ght:bold"><o:p> </o:p></span></font></b></p> <p class=3D"MsoNormal" style=3D"text-align:justify"><font size=3D"3" face= =3D"Arial"><span style=3D"font-size:12.0pt">There is no minimum Reactive Po= wer capability requirement. The Reactive Power requirement is set for= th in Protocol Section 6.5.7.1, <i><span style=3D"font-style:italic">Generation Resources Required to Provi= de VSS Installed Reactive Capability</span></i>. Specifically, subsec= tion (2) states:<o:p></o:p></span></font></p> <p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:.5in;ma= rgin-bottom: 12.0pt;margin-left:.5in;text-align:justify"> <font size=3D"3" face=3D"Arial"><span style=3D"font-size:12.0pt">Generation= Resources required to provide VSS except as noted below in items (3) or (4= ), <b><u><span style=3D"font-weight:bold">shall have and maintain a URL which = has an over-excited (lagging) power factor capability of ninety-five hundre= dths (0.95) or less and an under-excited (leading) power factor capability = of ninety-five hundredths (0.95) or less</span></u></b>, both determined at the generating unit’s maximu= m net power to be supplied to the transmission grid and at the transmission= system Voltage Profile established by ERCOT, and both measured at the poin= t of interconnection to the TDSP. <o:p></o:p></span></font></p> <p class=3D"MsoNormal" style=3D"text-align:justify"><font size=3D"3" face= =3D"Arial"><span style=3D"font-size:12.0pt">As described in the response to= Question 1, Protocol Section 6.5.7.1(2) states that a Generation Resource = must provide the MVAR requirement (+/- 0.95 power factor) calculated at the maximum net output to the ERCOT Transmissi= on Grid, and that level must be available at all MW output levels. <o:p></o:p></span></font></p> <p class=3D"MsoNormal" style=3D"text-align:justify"><font size=3D"3" face= =3D"Arial"><span style=3D"font-size:12.0pt">ERCOT, or TSPs designated by ER= COT, have the right to instruct Generation Resources to make adjustments fo= r voltage support within the URL capacity limits. However, dispatching a Generation Resource within a URL range is the right= of the system operator, and is unrelated to, and does not affect a Generat= ion Resource’s obligation to maintain a power factor capability of &#= 43;/- 0.95 when dispatched by ERCOT or TSPs.<o:p></o:p></span></font></p> <p class=3D"MsoNormal" style=3D"text-align:justify"><font size=3D"3" face= =3D"Arial"><span style=3D"font-size:12.0pt">Protocol Section 6.7.6(5) confi= rms the power factor capability requirement in Protocol Section 6.5.7.1(2).= Specifically, the first sentence reads:<o:p></o:p></span></font></p> <p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:.5in;ma= rgin-bottom: 12.0pt;margin-left:.5in;text-align:justify"> <font size=3D"3" face=3D"Arial"><span style=3D"font-size:12.0pt">At all tim= es a Generation Resource unit required to provide VSS is On-Line, the URL m= ust be available for utilization at the generating unit’s continuous = rated active power output, and <b><u><span style=3D"font-weight:bold">Reactive Power up to the unit’= s operating capability must be available for utilization at lower active po= wer output levels</span></u></b>. <o:p></o:p></span></font></p> <p class=3D"MsoNormal" style=3D"text-align:justify"><font size=3D"3" face= =3D"Arial"><span style=3D"font-size:12.0pt">Therefore, under this Protocol = as well, the power factor capability requirement does <b><u><span style=3D"font-weight:bold">not</span></u></b> decrease with dec= reasing generation output. A Generation Resource must be able to main= tain the MVAR capability requirement as described in Protocol Section 6.5.7= .1(2) even with decreasing power output. <o:p></o:p></span></font></p> <p class=3D"MsoNormal" style=3D"text-align:justify"><font size=3D"3" face= =3D"Arial"><span style=3D"font-size:12.0pt">The second sentence in Protocol= Section 6.7.6(5) states:<o:p></o:p></span></font></p> <p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:.5in;ma= rgin-bottom: 12.0pt;margin-left:.5in;text-align:justify"> <font size=3D"3" face=3D"Arial"><span style=3D"font-size:12.0pt">In no even= t shall the Reactive Power available be less than the required installed re= active capability multiplied by the ratio of the lower active power output = to the generating unit’s continuous rated active power output, and any Reactive Power available for utilization must= be fully deployed to support system voltage upon request by ERCOT, or a TS= P.<o:p></o:p></span></font></p> <p class=3D"MsoNormal" style=3D"text-align:justify"><font size=3D"3" face= =3D"Arial"><span style=3D"font-size:12.0pt">This sentence does not conflict= with the power factor capability requirement in the first sentence or Prot= ocol Section 6.5.7.1(2) by establishing a minimum reactive capability requirement. In fact, as described above, the re= quirement in 6.5.7.1(2) is confirmed in the first sentence of this section.= The language in the second sentence of this section merely accounts = for situations in which a Generation Resource encounters equipment-related issues or other unforeseen circumstances that= may cause the Reactive Power capability to be less than the requirement in= Protocol Section 6.5.7.1(2). If the Reactive Power is less than the = calculation described in the second sentence, then the Generation Resource’s ability to support system voltage may= jeopardize the reliability of the ERCOT Transmission Grid.<o:p></o:p></spa= n></font></p> <ol style=3D"margin-top:0in" start=3D"3" type=3D"1"> <li class=3D"MsoNormal" style=3D"margin-bottom:0in;margin-bottom:.0001pt;te= xt-align: justify;mso-list:l0 level1 lfo1"> <b><font size=3D"3" face=3D"Arial"><span style=3D"font-size:12.0pt;font-wei= ght:bold">Clarify the definitions for “generating unit’s maximu= m net power” as indicated in Protocol Section 6.5.7.1(2) and “t= he generating unit’s continuous rated active power output” as indicated in Protocol Section 6.7.6(5).<o:p></o:p></span></font></b> </li>= </ol> <p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;mar= gin-bottom: 0in;margin-left:.25in;margin-bottom:.0001pt;text-align:justify"> <b><font size=3D"3" face=3D"Arial"><span style=3D"font-size:12.0pt;font-wei= ght:bold"><o:p> </o:p></span></font></b></p> <p class=3D"MsoNormal" style=3D"text-align:justify"><font size=3D"3" face= =3D"Arial"><span style=3D"font-size:12.0pt">Both references above refer to = the Net High Capability Limit provided by the Generation Resource to ERCOT = through resource registration. Net High Capability Limit is the net high MW generation output based on the rating of plant eq= uipment minus plant Load.<span class=3D"StyleBold"><b><font face=3D"Arial">= <span style=3D"font-weight:normal"><o:p></o:p></span></font></b></span></sp= an></font></p> <p class=3D"MsoNormal" style=3D"text-align:justify"><span class=3D"StyleBol= d"><b><font size=3D"3" face=3D"Arial"><span style=3D"font-size:12.0pt">CONT= ACT:</span></font></b></span> If you have any questions, please conta= ct your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contac= t ERCOT Client Services via e-mail at <a href=3D"mailto:[log in to unmask]">[log in to unmask]</a>.= <o:p></o:p></p> <p class=3D"MsoNormal" style=3D"text-align:justify"><span class=3D"StyleBol= d"><b><font size=3D"2" face=3D"Arial"><span style=3D"font-size:10.0pt">If y= ou are receiving e-mail from an ERCOT distribution list that you no longer = wish to receive, please follow this link in order to unsubscribe from this list: </span></font></b></span><font size= =3D"2"><span style=3D"font-size:10.0pt"><a href=3D"http://lists.ercot.com/"= >http://lists.ercot.com</a>.<o:p></o:p></span></font></p> <p class=3D"MsoNormal" style=3D"text-align:justify"><font size=3D"2" face= =3D"Arial"><span style=3D"font-size:10.0pt">sg<o:p></o:p></span></font></p> <p class=3D"MsoNormal"><font size=3D"2" face=3D"Arial"><span style=3D"font-= size:10.0pt"><o:p> </o:p></span></font></p> </div> </body> </html> --_000_6F0027746577F94DA16FD8D84F875DF6016DF919CPWP016Gercotco_--