Abstract
This paper proposes an optimization based maximum power point tracking (MPPT) algorithm for selection of appropriate external rotor resistances of wound rotor induction generator (WRIG). The generator coupled with a Wells turbine is used in oscillating water column (OWC) wave power plants. The Wells turbine suffers with stalling behaviour that reduces the average output power significantly. Hence, the objective is to prevent aerodynamic stalling of the Wells turbine and hence maximizing the output power simultaneously. But inappropriate selection of rotor resistance leads to excessive power loss. Therefore, two approaches have been applied: (i) the rotor resistance values are selected manually by trial and error method or non-optimized approach (ii) a performance index has been derived and minimized using particle swarm optimization technique to obtain the optimized values of rotor resistance. Simulation results have been performed for turbine efficiency, output power and power loss in external rotor resistance. Finally, the proposed control approach is illustrated for two particular cases of regular and irregular waves.
Highlights
Our oceans covering two thirds of the earth’s surface have enormous amount of energy stored in several forms such as waves, tides, salinity, etc
The present study proposes the maximization of output power of Wells turbine-generator based
Regardless of higher pressure values, average output power remains low. This necessitates the implementation of an efficient control strategy so as to achieve the maximized output power and to avoid the Wells turbine stalling
Summary
Our oceans covering two thirds of the earth’s surface have enormous amount of energy stored in several forms such as waves, tides, salinity, etc. In the context of OWC based Wells turbine generator system, the control objectives can be broadly classified as: (i) Air flow control; (ii) Rotational speed control; (iii) Maximization of output power. The external rotor resistance switching strategies were proposed in [20,21,22,23] In these studies, the main focus was to avoid the Wells turbine stalling behaviour. The external rotor resistance switching strategies proposed in the recent past were used for maximum power point tracking (MPPT) and for preventing Wells turbine stalling behaviour. The present study proposes the maximization of output power of Wells turbine-generator based. The simulation studies have been performed with regular waves to achieve the maximized output power without any stalling losses at the turbine and minimized power losses across external rotor resistance.
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