Capacity Value of Wind Power

Abstract

Publisher's copyright statement: c 2011 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. The capacity value of a generator is the contribution that a given generator makes to generation system adequacy. The variable and stochastic nature of wind sets it apart from conventional energy sources. As a result, the modeling of wind generation in the same manner as conventional generation for capacity value calculations is inappropriate. In this paper a preferred method for calculation of the capacity value of wind is described and a discussion of the pertinent issues surrounding it is given. Approximate methods for the calculation are also described with their limitations highlighted. The outcome of recent wind capacity value analyses in Europe and North America, along with some new analysis are highlighted with a discussion of relevant issues also given.Index Terms--Wind power, capacity value, effective load carrying capability, power system operation and planning

A reduced-form approach for representing the impacts of wind and solar PV deployment on the structure and operation of the electricity system

“…Since the firm capacity requirement is the capacity needed to meet peak load and contingency events, a technology's capacity value is the amount of capacity available during peak load. Whereas conventional generating technologies are assumed to contribute their full nameplate capacity to firm capacity, the capacity values of wind and solar PV technologies tend to decline with increasing market share [12,[22][23][24]. This section describes a reproducible approach to parameterize the relationship between capacity value and market share for solar PV and wind using RLDCs.…”

Comparison of Capacity Value Methods for Photovoltaics in the Western United States

“…This value is used as the target LOLE value throughout this report. Reliability methods are widely accepted and considered accurate methods for calculating capacity value [5][6][7][8]. A second describes a "risk level" as "a probability of the power system under investigation not to be able to cover its peak demand without electricity import.…”

“…The ELCC approximation is given by the value of ELCC, which yields equality between equations (7) and (8). A closed-form solution for the value of ELCC is given by:…”

“…Therefore, assessing the adequacy of renewable generation technologies and consequently estimating their capacity value is crucial for accurate reliability and planning of power systems [2]. Previous analyses have considered the capacity value of wind [1,[3][4][5][6][7][8], photovoltaic (PV) solar [9][10][11][12][13][14], and concentrating solar power (CSP) plants [15]. Partially due its maturity, the capacity value of wind has been more widely studied than solar technologies.…”

Summary of Time Period-Based and Other Approximation Methods for Determining the Capacity Value of Wind and Solar in the United States: September 2010 - February 2012

“…Generally, the capacity value of a conventional generator can be approximated by multiplying the installed capacity of a conventional generating plant by that plant's unforced outage rate [3]. Wind and solar power cannot be evaluated in the same manner, as wind and resource availability will be as much a determinant of capacity value as mechanical availability.…”