In Chapters 7, 8 and 10, indexes have been defined and procedures have been described for evaluation of cogeneration systems from the point of view of thermodynamic, environmental and economic performance, respectively. In order to perform this evaluation, there is need either to measure or to compute certain operating parameters such as electrical, mechanical and thermal energy produced, pollutants emitted, fuel consumption and various costs in a certain period of time. In order to compute these parameters, there is need to construct the simulation model of the system, which consists of a set of equations that describe the performance of the system by mathematical terms. The simulation model is also a prerequisite for optimisation of the system, that is for determining the best structure, nominal (design) specifications and operating point of the system at each instant of time, taking into consideration the technical and economic conditions prevailing at this instant. The development of simulation models and the optimisation of the synthesis (structure), design and operation of cogeneration systems are the subjects of this chapter.

Chapter Contents:

• 13.1 Introduction to simulation and optimisation of cogeneration systems
• 13.2 Development of simulation models
• 13.3 Performance evaluation of cogeneration systems
• 13.4 Mathematical optimisation of cogeneration systems
• 13.4.1 Definition of optimisation
• 13.4.2 The need and importance of optimisation in cogeneration
• 13.4.3 Levels of optimisation
• 13.4.4 The role of time in optimisation of cogeneration systems
• 13.4.5 Formulation and solution methods of the static optimisation problem
• 13.4.5.1 Mathematical statement of the static optimisation problem
• 13.4.5.2 Objective functions
• 13.4.5.3 Independent variables
• 13.4.5.4 Equality and inequality constraints
• 13.4.5.5 Methods for solution of the static optimisation problem
• 13.4.5.6 Decomposition
• 13.4.5.7 Multi-level optimisation
• 13.4.6 Formulation and solution methods of the dynamic optimisation problem
• 13.4.6.1 Mathematical statement of the dynamic optimisation problem
• 13.4.6.2 Methods for solution of the dynamic optimisation problem
• 13.4.7 On-line and off-line operation optimisation of cogeneration systems
• 13.4.8 Sensitivity analysis
• 13.4.8.1 Sensitivity analysis with respect to parameters
• 13.4.8.2 Sensitivity analysis of the objective function with respect to independent variables
• 13.5 Optimisation examples
• References

Inspec keywords: cogeneration; power system simulation; optimisation

Other keywords: simulation models; electrical energy; operating point; cogeneration systems; environmental performance; economic performance; thermodynamic performance; nominal design specifications; pollutants; mechanical energy; operating parameters; fuel consumption; thermal energy

Subjects: Optimisation techniques; Thermal power stations and plants