4.5 Article

Capacity Value from Wind and Solar Sources in Systems with Variable Dispatchable Capacity-An Application in the Brazilian Hydrothermal System

Journal

ENERGIES
Volume 14, Issue 11, Pages -

Publisher

MDPI
DOI: 10.3390/en14113196

Keywords

capacity value; capacity credit; intermittent generation; capacity contribution; hydropower; variable dispatchable capacity; effective load carrying capability (ELCC); loss of load probability (LOLP); loss of load expectation (LOLE)

Categories

Funding

  1. Institute of Energy and Environment of University of Sao Paulo (IEE-USP)
  2. Enel Distribuicao Sao Paulo
  3. Brazilian Electricity Regulatory Agency (ANEEL) through the Priority Energy and Strategic R&D Program Energy Efficiency and Minigeneration in Public University Institutions [00390-1086/2018]
  4. CESP-Companhia Energetica de Sao Paulo, through the Priority Energy and Strategic R&D Program Technical and Commercial Arrangements for the Insertion of Energy Storage Systems in the Brazilian Electricity Sector [PD-0061-0054/2016]
  5. Brazilian Electricity Regulatory Agency (ANEEL)

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This article introduces a method to calculate the capacity value from renewable sources when the capacity of dispatchable generators in the system is variable. By abandoning the assumption of constant dispatchable capacity, this approach can be extended to incorporate other energy-limited resources into planning and operation models as reliable capacity sources.
The most robust methods to determine the capacity contribution from intermittent sources combine load curve, variable generation profile, and dispatchable generators' data to calculate any new inserted variable source's capacity value in the power system. However, these methods invariably adopt the premise that the system's dispatchable generators' capacity is constant. That is an unacceptable limitation when the energy mix has a large share of hydroelectric sources. Hydroelectric plants are dispatchable sources with variable maximum power output over time, varying mainly according to the reservoirs' level. This article develops a method that makes it possible to calculate the capacity value from renewable resources when the dispatchable generation units of an electric system have variable capacity. The authors apply the method to calculate the capacity value from solar and wind sources in Brazil as an exercise. By abandoning the hypothesis of constant dispatchable capacity, the developed approach is in principle extensible for other energy-limited resources, such as batteries and concentrating solar power (CSP). This can be a strategy to incorporate energy-limited capacity sources into the planning and operation models as reliable capacity sources.

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