Analysis of regulation methods of a combined heat and power plant based on gas turbines

Abstract

This paper addresses the study of eight different regulation methods on a cogeneration plant integrated by two gas turbines model LM2500 coupled to an HRSG (heat recovery steam generator), which provides steam at high and medium pressure and thermal oil. This study is aimed at showing the capacity of each regulation method meaning the range of thermal power that is available for a given electrical power. This responds to one of the main problems raised by the cogeneration systems: satisfying both electrical and thermal power demands which might vary and not be coupled, simultaneously. The performance parameters, as energetic efficiency and energy saving potential are also evaluated, which enables the assessment and comparison of the cogeneration plant responses under the different regulation methods.The results obtained allow a grading of the regulation methods based on three parameters: regulation capacity, efficiency and energy saving potential. This grading enables to rule out those regulations methods that perform worst results or might damage the Gas Turbine.