Abstract
The increasing use of variable generation technologies (VGTs) in power systems, such as wind and photovoltaic generation, has introduced new challenges in the definition of capacity remuneration mechanisms for promoting system reliability. In this context, in this article we propose a novel framework for determining the capacity value of VGTs to contribute to the generation system adequacy, as well as a corresponding method for allocating capacity payments in hydrothermal power systems. We show that the capacity value of VGTs increases with the presence of water reservoirs, since VGTs help relieving hydropower plants from using scarce water resources during off-peak hours thus making more resources available to supply the demand during peak hours.
Highlights
Many countries around the world have committed to a decarbonisation of their electricity system
Variable generation technologies (VGT) such as wind power and photovoltaic generation appear as key pillars to achieve these energy targets and will undoubtedly play a key role in future power systems
The increasing use of variable generation technologies (VGTs) has brought several countries to review their current capacity remuneration mechanisms, or design new ones, in order to account for the capacity value of VGTs
Summary
Many countries around the world have committed to a decarbonisation of their electricity system. In order to follow a conservative approach and ensure system capacity sufficiency against worst case scenarios, the water availability considered for calculating the Initial Capacity of hydropower plants was determined as the average of the two worst hydrological years in terms of equivalent energy inflow. A similar approach was adopted for wind and solar power plants In this case, the Initial Capacity was determined by multiplying the nominal power of each generator with the minimum value of: i) the lowest capacity factor of the past 5 years and ii) the average capacity factor observed in the 52 hours with the maximum load in the previous year. To propose a methodology for determining the contribution of VGT to the system capacity sufficiency in hydrothermal power systems To show the results of applying the proposed methodology in a case study based on the Chilean National Electric System (SEN) and compare the results with the ones obtained using the current methodological approach followed in Chile The main contributions of this article are: 1. To propose a methodology for determining the contribution of VGT to the system capacity sufficiency in hydrothermal power systems To show the results of applying the proposed methodology in a case study based on the Chilean National Electric System (SEN) and compare the results with the ones obtained using the current methodological approach followed in Chile
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