Abstract
This paper presents a simulation of onshore energy conversion system connected to the electric grid and under an event-based supervisor control based on deterministic version of a finite state machine. The onshore energy conversion system is composed by a variable speed wind turbine, a mechanical transmission system described by a two-mass drive train, a gearbox, a doubly fed induction generator rotor and by a two-level converter. First, mathematical models of a variable speed wind turbine with pitch control are studied, followed by the study of different controller types such as adaptive controllers and predictive controllers. The study of an event-based supervisor based on finite state machines is also studied. The control and supervision strategy proposed for the onshore energy conversion system is based on a hierarchical structure with two levels, execution level where the adaptive and predictive controllers are included, and the supervision level where the event-based supervisor is included. The objective is to control the electric output power around the reference power and also to analyze the operational states according to the wind speed. The studied mathematical models are integrated into computer simulations for the onshore energy conversion system and the obtained numerical results allow for the performance assessment of the system connected to the electric grid. A comparison of the onshore energy conversion system performance without or with the supervisor is carried out to access the influence of the control and supervision strategy on the performance.
Highlights
The increase in the use of renewable energy sources combined with energy efficiency measures has reduced consumption and imports of fossil fuels and has contributed to increase the representativeness of renewable energies in final energy consumption
This paper presents a simulation of onshore energy conversion system connected to the electric grid and under an event-based supervisor control based on deterministic version of a finite state machine
The control and supervision strategy proposed for the onshore energy conversion system is based on a hierarchical structure with two levels, execution level where the adaptive and predictive controllers are included, and the supervision level where the event-based supervisor is included
Summary
The increase in the use of renewable energy sources combined with energy efficiency measures has reduced consumption and imports of fossil fuels and has contributed to increase the representativeness of renewable energies in final energy consumption. Turbines need to be designed to take advantage of the higher level of the wind speed at offshore, i.e., the design must consider a higher value for the cut-out wind speed: The wind speed at which the wind turbine shuts down to prevent mechanical damage of the structure. The performance during the capture of wind energy is a prominent issue and has been dealt by research on turbine design and advanced control strategy, and by condition monitoring using a supervisor.
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