Süleyman Hakan Sevilgen

Electricity Production Cost Analysis of a Combined Cycle Power Plant

Abstract In this study, thermoeconomic analysis of a combined cycle power plant (CCPP) is investigated. The aim of this study is to find the minimum electricity production cost (EPC). The variable parameters selected for the optimization are the compressor pressure ratio, turbine inlet temperature, isentropic efficiencies, discount rate, etc. In the analysis, all thermodynamic and thermoeconomic expressions are formulated as a function of these decision variables. Consequently, the developed model is solved and the conditions giving minimum unit EPC for each value of variable parameters are determined.

Energy Based Thermoeconomic Analysis of a Combined Cycle System with Steam Extraction (Cogeneration System)

This study presents a thermoeconomic analysis methodology to calculate unit energy (electricity and heat) production cost for a combined cycle system with steam extraction (cogeneration system). The aim of this methodology is to find the minimum energy production cost. Therefore, firstly, minimum electricity production cost is found by using annual levelized cost method for a combined cycle system which only produces electricity. Secondly, minimum heat production cost for a combined cycle system with steam extraction is calculated. Extracted steam causes the power loss in the steam turbine and reduces the income. So, heat energy production cost can be correctly determined. In the model, the fall of the income associated with the power loss is accepted as equal to heat energy cost, and heat energy production cost is formulated as a function of electricity energy production cost. Finally, the effect of different parameters like compressor pressure ratio and steam pressure on heat production cost is investigated. As a result, the outcomes of this study can provide a basis used for determination of the unit energy production costs for different energy production systems.

Generation Planning Methodology Based on Load Factor for Hydroelectric Power Plants

Major parameters affecting the generation capacity of hydroelectric plants are resource regime, reservoir geometry, and water head together with flow rate and efficiency. For the same resource regime and flow rate, water head can be altered depending on generation planning. By means of holding water in the reservoir and consequent increase in head can lead to boost power generation. In this paper, a method to compare two different operational styles has been identified; a plant operating with a low fixed head has been compared to a plant with an increased water head by means of holding water. In order to achieve this objective, an economical model including annual power revenues and net income increase depending on the operational strategy has been developed. Parameters affecting net income gain of the developed model are power generation boost and loss during peak and nonpeak durations, and electricity prices during peak and nonpeak durations. Depending on this model, strategies that would increase the plant revenue streams with increasing reservoir head have been presented in the results section of the paper.