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- Multi-market optimal scheduling of a power generation portfolio with a price-maker pumped-storage hydro unitPublication . Lagarto, João; Fernandes, Filipe; Sousa, Jorge A. M.; Santana, JoãoThe increasing integration of renewables in the energy markets has been raising some challenges to generating companies (GENCOs), in terms of operation and planning of their generation portfolios. A GENCO aiming at maximizing its profits has to deal with offers to several available markets, among which are the Day-ahead Market (DAM) and the Secondary Reserve Market (SRM). This paper presents a scheduling solution of a price-maker GENCO whose portfolio includes a pumped-storage hydro unit, acting simultaneously in the DAM and SRM. The results were obtained for six different scenarios, where the portfolio may include a thermal generation unit and compares the GENCO behavior in both markets either as a price-taker or as a price-maker. The results put in evidence the portfolio effect when the GENCO takes into account its influence on price, which is seen in the price-maker scenarios, whereas the scheduling remains unchanged under the price-taker behavior.
- Scheduling of a pumped-storage hydro in the day-ahead market and in the secondary reserve marketPublication . Fernandes, Filipe; Sousa, Jorge A. M.; Santana, João; Lagarto, JoãoThe increasing integration of wind power in the Portuguese energy market has been raising some challenges in terms of operation and planning of the generation portfolio and of power system management, with ancillary services playing a major role in system stability. A generation company (GENCO) aiming at maximizing its profits has to deal with bids to several available markets, among which are the Day-ahead Market (DAM) and the Secondary Reserve Market (SRM). This paper presents a scheduling solution of a price-maker GENCO whose portfolio comprises a pumped-storage hydro (PSH) unit with variable pumping capacity, acting simultaneously in the DAM and SRM. The results were obtained for four different scenarios, where the PSH may or may not possess variable pumping capacity and compares the PSH behavior in one or both markets simultaneously. The model was implemented in General Algebraic Modeling System (GAMS) as a Mixed Integer Programming (MIP) using CPLEX solver.
- Optimal scheduling of a pumped storage hydro unit in the day-ahead and secondary reserve electricity marketPublication . Lagarto, João; Fernandes, Filipe; Sousa, Jorge A. M.; Santana, João; Martins, BertoAncillary services play a major role in power systems security and stability. The transmission systems operators contract some of these services at minimum cost in competitive markets. This is the case of the secondary reserve market (SRM). Besides the day-ahead market (DAM) generating companies, aiming at maximize their profits, can increase their revenues by selling available capacity in the SRM. This paper presents the solution of a price-taker generating company, owning a pumped-storage hydro (PSH) unit, acting in DAM and SRM. The results were obtained for three case studies: the generating company acts only in the DAM; the generating company acts in both markets with a fixed pumping capacity of the PSH unit; the generating company acts in both markets with a variable pumping capacity of the PSH unit. Results show that higher profits are obtained when acting in both markets with a variable pumping capacity of the PSH unit.