Browsing by Author "Manso, Juan Carlos Galvis"

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    Cost assessment of efficiency losses in hydroelectric plants.
    (2011) Manso, Juan Carlos Galvis; Feltrin, Antonio Padilha; Yusta Loyo, Jose Maria
    Some important real-time tasks of the independent system operator (ISO) are the monitoring and control of power system events (load deviations and contingencies). These events are usually managed by the ISO using operating reserve ancillary services. These services represent an additional capacity (MW) available in generators and some interruptible loads. Generators must change their operating points in order that this capacity can remain available. These changes might lead to efficiency losses in energy production. In systems with a high percentage of hydroelectric production, hydroelectric plants need to know the impact of ancillary services on their profits. This work therefore analyzes the cost of efficiency losses due to operating reserve availability in hydroelectric generators. A method to calculate this cost component is proposed using a unit commitment dispatch for a single hydroelectric plant. This dispatch is performed without considering the operating reserve availability and is compared with the traditional dispatch, which takes into account the availability of operating reserve. The proposal is used to calculate the cost of efficiency losses on a Brazilian hydroelectric generator. We found that the cost of efficiency losses can be considerable when compared to the incomes of a hydroelectric plant in the short-term market.
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    Demand side management using time of use and elasticity price.
    (2016) Manso, Juan Carlos Galvis; Costa, Augostino
    Demand Side Management (DSM) has been traditionally seen as a mean of reducing peak electricity demand so that utilities can delay building further capacity. In fact, by reducing the overall load on an electricity network, DSM has various beneficial effects, including mitigating electrical system emergencies, reducing the number of blackouts and increasing system reliability. In this paper we propose a methodology to evaluate DSM in electric distribution systems, based on elasticity and time of use pricing concepts. This evaluation is performed through an optimal power flow model considering linear constraints. The results of the proposed method depend, to a great extent, on two parameters: the maximum share of load which consumers are able to shift and the elasticities used to express the consumer's level of participation in the dynamic pricing mechanism. Simulation results confirm the benefits of Time of Use Demand Side Management reducing the peak-toaverage ratio of the total power demand, as well as each user’s individual daily electricity charges.