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Inactive State Inactive State • What is its purpose? • When is it used? Examples • If there were no equipment issues going into an Inactive state, why are repairs required coming out of an inactive state? • IEEE 762 defines an inactive state where the unit is unavailable. Unavailable is an outage state with no equipment issues? • GADS adds “After some repairs” should this be “After some maintenance”? Repair implies an outage. • GADS Inactive Reserve (IA) states that the unit must be in Reserve Shutdown (RS) which is an Active State and available in a moments notice. How can a unit be available at a moments notice if some repairs are required? • GADS Mothball (MB) indicates that the units may have experienced mechanical problems and must be in outage (PO,FO,MO) for 60 days before going into MB. Does this negate the “not equipment problem” in the opening statement. • Can MB be use without a waiting period if there are no equipment problems? • Who determines which state (IA or MB)? • When does an investigation end and a repair begin? How does IEEE 760 define Inactive State? Inactive State is called “Deactivated Shutdown” in IEEE 762 and is defined as “The state in which a group or individual WTG is unavailable for service for an extended period of time for reasons not related to the equipment.” GADS interprets this to include the following. Inactive Reserve (IR) – IR is defined by IEEE 762 and GADS as “The State in which a group is unavailable for service but can be brought back into service after some repairs in a relatively short duration of time, typically measured in days.” Mothballed (MB) – MB is defined by IEEE 762 and GADS as “The State in which a group or individual WTG is unavailable for service but can be brought back into service after some repairs with appropriate amount of notification, typically weeks or months.” If they were not broken when they went into an Inactive State, why do they require repairs? How does GADS define Inactive State GADS added “after some repairs” and defines this statement to mean that some action may be needed to prepare the group for service because it had been sitting idle for a period of time and some equipment parts have deteriorated or need replacing before the group can be operated. Repairs imply an Outage state. Outage state implies an Active State that is Unavailable. Should “Maintenance” be used instead of “Repairs”? How does GADS define Inactive Reserve? Inactive Reserve: The group should be operable at the time the IR begins. This does not include groups that may be idle because of a failure and dispatch did not call for operation. A group that is not operable or is not capable of operation at a moment’s notice should be on a forced, maintenance, or planned outage and remain on that outage until the proper repairs are completed and the group is able to operate. The group must be on RS (Reserve Shutdown) a minimum of 60 days before it can move to IR status. IR is defined as an unavailable condition. RS is an available condition. Should “Maintenance” be used instead of “Repairs”? How. does GADS define Mothball? Mothball (MB): GADS added “after some repairs” and defines this statement to mean that some action may be needed to prepare the group for service because it had been sitting idle for a period of time and some equipment parts may have deteriorated or need replacing before the group can be operated. The group may have also experienced a series of mechanical problems for which management may wish to wait for a period of time to determine if the group should be repaired or retired. A group that is not operable or is not capable of operation at a moment’s notice must be on a forced, maintenance, or planned outage and remain on that outage for at least 60 days before it can be moved to the MB state. 1. The lead in section indicates that the unit cannot be down for equipment problems. The above in red seems to be in conflict with this condition. 2. If the unit is not in a outage state, can it be placed into MB without a 60 day waiting period? How can a unit be MB and Outage at the same time? Is outage in conflict with “not an equipment problem”? How. does GADS define Mothball? Mothball (MB) Continued: If repairs are being made on the group in order to restore the group to operating status before the 60‐day period expires, then the outage must remain a forced, maintenance, or planned outage and not MB. What is defined as repairs? (Evaluating cost, ordering parts, investigating damage, evaluating equipment availability and lead times, and etc. If group repairs for restoring the group to operation are made after the 60‐day period then the first 60 days must be a forced, maintenance, or planned outage and the time after the 60 days, including the repair time on the group up to operation, shall be the MB event. Agenda Item 9a.i.b Planning Committee Meeting December 13-14, 2011 Generating Availability Data System Working Group (GADSWG) Scope Purpose The Generating Availability Data System Working Group (GADSWG) is to implement a uniform approach to reporting and measuring North American generating plant availability, performance and other related reliability data. Activities To accomplish its purpose, the GADSWG will perform the following activities: 1. Review and recommend new generation availability data that should be subject to mandatory collection by NERC. 2. Review additions and changes to the GADS Data Reporting Instructions (DRI) and GADS Wind Data Reporting Instructions. 3. Analyze, assess and report on trends and risks to reliability from generator availability and performance. Annual Deliverables The GADSWG will contribute to the PAS’s annual Performance Analysis State of Reliability Report. Membership The GADSWG will consist of: • Chair • Vice Chair • NERC staff coordinator(s) • Eight (8) At least one Generation Owner members from each NERC region • One Canadian member • One North American Generation Forum (NAGF) member • One Electric Power Supply Association (EPSA) member • One additional “at large” member • Chairperson(s) of subgroup(s) • Other members, as requested by the NERC staff coordinator • Additional Members can be added: o At the request of the Planning Committee sector representatives, or o As needed by the NERC coordinator. The subcommittee working group chair and vice chair are appointed by the chairs of the NERC Operating Committee and Planning Committee for one, two-year term. The vice chair should be available to succeed to the chair. The Operating Committee members shall be appointed by the chair of the Operating Committee for a two-year term. Order of Business In general, the desired, normal tone of GADSWG business is to strive for constructive technically sound solutions which also achieve consensus. On the relatively few occasions where that desired outcome cannot be achieved, the GADSWG will defer to a vote by the Planning Committee to settle the issue. If any strong minority opinions develop, those opinions may be documented as desired by the minority and forwarded to the PAS Chair and PC Chair for future meeting consideration. NERC staff advice should be about what the ERO needs to be successful. The above normal tone of PAS to seek a technically sound consensus is very important. NERC staff and Observers are also expected to strive for constructive technically sound solutions and seek consensus. Reporting The GADSWG reports to the Performance Analysis Subcommittee (PAS). Reports and recommendations developed by the GADSWG require approval by PAS and the Planning Committee. Meetings Four to six open meetings per year, or as needed. Approved by the NERC Planning Committee: _, 20112016 Generating Availability Data System Working Group Scope 2 Is It Time to Deprecate the EFORd Formula That Uses the Markov Approach? Deprecation means that although something is available or allowed, it is not recommended or that, in the case where something must be used, to say it is deprecated means that its failings are recognized. Ron Fluegge GADS Open Source September 27, 2016 The peaking unit only operates (in demand) 5 hours per day. A 48-hour forced outage (U1) overlaps two of the 5-hour demand periods (10 hours of demand for the unit). If the unit is expected to be available to meet the expected daily 5-hour peak demand, it does not matter whether the unit is available in reserve shutdown or in a scheduled or forced outage during the off peak hours as long as it is available to operate during the 5 hours of demand each day. Intuitively, the risk of not being available to serve load during the demand periods should be the ratio of the forced outage hours during the demand periods divided by the sum of the forced outage hours during demand periods plus the service hours during the demand periods. EFORd: is the unit available (i.e., not forced out) to meet the demand you expect it to serve however you define the demand period? Equivalent Forced Outage Rate demand (EFORd) Input Data • Forced Outage Hours – FOH • Service Hours - SH • Equivalent Forced Derated Hours - EFDH • Equivalent Forced Derated Hours During Reserve Shutdowns - EFDHRS • Available Hours - AH • Reserve Shutdown Hours - RSH • # of FO occurrences • # of unit actual starts Where’s the “demand” data? • # of unit attempted starts IEEE Std 762-2006 • 1. Overview - The term demand applied to a rate, as in EFORd, indicates that the probability of an occurrence has been estimated for periods when the unit is in demand to generate • 3.2 demand forced outage rate (FORd): A measure of the probability that a generating unit will not be available due to forced outages when there is demand on the unit to generate.
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