IEC TS 63019-2019 pdf free.Photovoltaic power systems (PVPS)- Information model for availability.
This document defines generic terms of PV systems and environmental constraints indescribing PVPS operation and availabilities,restoration,time, and optional energyaccounting criteria for operation and maintenance (O&M) and asset management. Thisdocument defines terminology and generic terms for reporting availability measurements. APVPS includes all equipment up to the point of common coupling (interconnection point) to agrid or network that is buying the energy produced; however,PVPS availability can and oftenis affected by the grid and grid quality.Measurements are concerned with units of timeaffected; involved components,systems, and subsystems; and site and PVPS O&M.Unavailability measurements are also instrumental for measurement and/or estimationtechniques for determining PVPS capabilities or, more specifically, capability loss.
The conditions – environmental and other site aspects – are considered for reporting thestation condition and the impact those conditions have on the PVPS,including subsystemsand components. Environmental aspects include solar irradiance and other weather andlocation-specific conditions at the site.System operating constraints due to differential site oras-built characteristics,which might affect or eventually affect energy system performance(typically energy production), are included in the energy calculus (e.g.,availability model andenergy reporting).This document defines terms for reporting fundamental availability metrics.Formulas and application methods are included in Clause 6 and Annex A and Annex B.Thecategories can apply to the whole system (with the grid interface also affecting it) or tosubsystems and components,wherever the outages or reduced capability occur. lt isobserved that the more robust and granular data systems are, the better the knowledge of theissues affecting capabilities.
More generally,although this document is written to be applied to utility-scale PVPs,stakeholders will find that many of the document’s elements have application to smallersystems,subsystems,or components. Residential and small commercial systems will alsoneed enough data collection and maintenance logs in their operational phases to determineand document necessary uptime metrics and who should be receiving the data.
Multiple aspects of PVPS availability depend on the system quality and characteristics,system health,condition,and operational states. Therefore, it is essential to have clearknowledge and awareness of the operating and outage status of the power system’scomponents. This is important for O&M and reliability as well as for financial and insurancepurposes.As such,the data are collected for use.Performance,environmental, failure andoutage, time-based O&M, and electrical parameters are included in the types of data that maybe included in various aspects of the PVPs availability assessments. Levels of systems andconsequential data needs are described in the informative annexes.Information managementis addressed specifically in Annex E.
Night-time generation shutdown is not expected by definition;thus,PVPs cannot providepower except for those that include storage and are capable of providing night-time services.A similar definitional clarification – for example, a PVPs not operating because the array iscovered in snow – is in an out-of-environmental specification state even though the PVPscomponents are fully functional and available. The information model presented in thedocument is designed to be useful in defining boundaries to facilitate contractual division ofresponsibilities.
The availability of the total sum of the system, subsystems, and components affects theperformance of the PVPS. Typically,revenues depend on the energy delivered,and thatenergy depends on the availability.The proper functioning of the components is a function ofthe detailed design specifications and the o&M employed.Tracking downtime is a tool forasset management and reliability of the system.Figure 2 illustrates this interrelationship.
Figure 2 presents a logical consequence of reduced capability impacting energy production.The energy production will be c metered, and, in addition,the energy flow may generally bemonitored throughout the PVPS, as specified in the design of the monitoring systems. Thislogical balance between performance (energy) and availability (PVPS physical condition on atime basis) demonstrates the need to measure both in order to facilitate the assessment ofrequired PVPs functions.
lt is important to clarify the relationship between this document and the IEC 61724 series.Both address metrics of PVPs performance and the impact of reductions. IEC TS 61724-3carefully defines energy unavailability so that the stakeholders can determine the losses inperformance (according to the In-Service Energy Performance Index) separate from thelosses caused by energy unavailability. This will be further explained after the process ofusing the information model to handle the granularity of component health and condition(Figure 2) is applied to lost capacity and energy. The complementary nature of this documentwith the IEC 61724 series is characterized in Annex D in verification scenario Clause D.7 -Energy: measured, expected, and lost.
Assessments of required PVPS functions are desirable because the lEC Renewable Energy(IECRE)system addresses certification requirements of PVPSs,and the mandatory reportingrequirements of this document are candidates for IECRE procedures. This document isintended to facilitate application in multiple ways. The first is to provide consistency betweendefinitions in measurements and reporting.The second is to support certification requirementsthat may be specified.
Mandatory information categories defined in the document are written in capital letters. Thedesignation of mandatory applies to data collection but not necessarily the specific datareported because that is determined by the stakeholders’ needs.IEC TS 63019 pdf download.