A detail model including all mechanical and electrical aspects is necessary to fully study hybrid grid operation. In this paper, a new grid-connected hybrid generation system with a Stirling engine and a wind turbine, which are connected to a grid through a common dc bus, is presented. The Stirling is more efficient than photo voltaic array and its combination with the wind turbine can create an efficient hybrid system. Fatigue, Aerodynamics, Structures, and Turbulence and Simulink/MATLAB are used to model the mechanical parts of the wind turbine, Stirling engine, and electrical parts. Field oriented control method is developed on voltage source converter. Power signal feedback method is implemented to determine generators reference shaft speed in hybrid system. Permanent magnet synchronous generator is used in the wind turbine and Stirling engine. Simulation results show that a new hybrid generation system with Stirling and wind turbine can work like other hybrid system and has suitable performance.
In order to fully study the power quality of a grid-connected wind farm, a suitable model providing accurate output for wind farms is necessary. In this paper, different methods, which have been proposed in previous studies, are investigated with regard to the power quality problem using a squirrel-cage induction generator wind turbine. These models are different in terms of accuracy and simulation time. The question is: which method is more suitable for simulation of a wind farm? To answer this question, a criterion should be introduced to compare different modeling methods. Full turbine representation is introduced as the best criterion to compare equivalent models of a wind farm such as quasi-multiturbine representation, single turbine representation, and multiturbine representation. A typical medium-sized wind farm is simulated using the full model and several equivalent models. These equivalent models are compared with the full model considering the accuracy and simulation time (computational load). These models are used to calculate the voltage, flicker, active, and reactive powers at the point of common coupling. The TurbSim and RPM-Sim programs are used to simulate the wind profile and wind farm. Results show significant differences between equivalent models outputs.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.