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This paper presents an LPV/H∞ control strategy applied to power source coordination on board of average-power electric vehicles. The proposed approach concerns frequency separation of responses between three power sources in order to satisfy power demand of vehicle's electrical motor, taking into account that sources are expected to work within distinct frequency ranges. The three sources - fuel cell,...
This paper deals with a frequency-based energy sharing method between batteries and ultracapacitors (UC) as power sources within an electric vehicle (EV). A frequency splitter is used for routing the low-frequency content of power demand into the battery and its high frequencies into the UC system, taking profit from the UC as a peak power unit. The autonomy may thus be increased while also preserving...
This paper deals with the conception and building of an electrical power generation prototype based upon the cross-flow water turbines. The structure has been tested in grid-connected conditions in order to identify the hydrodynamic characteristics of the prime mover and to evaluate the energy efficiency of the overall energy conversion chain. The real-world tests confirm the preliminary conclusion...
The cross-flow water turbine generation system is, as any distributed grid connected generator, sensitive to all kind of power grid disturbances. The goal of this paper is to show how this system, by the means of its controls, is able to reject polluting harmonics. The fault ride through following voltage gaps is also proven. Experimental results obtained with a hybrid real-time test rig validate...
A study of the stand-alone mode of operation for cross-flow-water-turbine-based generation systems is presented in this paper. This system is considered to feed a mainly resistive load via a power electronics interface which allows the use of advanced integrated controls. It should guarantee the imposed voltage parameters in the absence of energy storage elements. Experimental tests have been performed...
This paper proposes a control strategy aiming at operating cascaded DC-DC converter architectures of photovoltaic (PV) modules at maximum power irrespective of the irradiance conditions, meanwhile meeting constraints of voltage-limitation type. The global optimum of cascaded connections of PV modules is generally equivalent with operating all the modules at maximum power point tracking (MPPT). The...
This paper attempts an as exhaustive as possible review of the control methods dedicated to optimizing the dynamic behavior of variable-speed wind energy conversion systems (WECS) from various viewpoints. Different performance criteria can be defined for WECS - e.g., the energy optimization can be achieved by operating the system at variable speed. The exploitation experience and grid-integration...
This paper describes a manner in which the energy-reliability optimization of wind energy conversion systemspsila operation can be achieved by means of the sliding mode control. The proposed approach aims at designing a tradeoff between maximizing the power harvested from wind by a horizontal-axis-grid-connected variable-speed doubly-fed-induction-generator-based wind power system and minimizing its...
A supervisory control approach is used to ensure the safe and optimal operation of a grid connected wind power system. Its global hybrid dynamics may roughly be captured into a hybrid automaton to be controlled by means of a two level hierarchical control structure. The low level continuous controllers perform optimization tasks, specific to different operating regimes. A supervisor placed on an upper...
This paper approaches the control problem aiming at maximizing the energetic conversion for a class of horizontal axis fixed pitch variable speed small power wind energy conversion systems, working in the partial load region. The wind turbine model and its parameters are poorly known. Using the extremum seeking control principles, a new approach of the generically called maximum power point tracking...
This paper concerns the design of a sliding control law for maximizing the power harvested from the wind by a variable speed induction generator based wind power system. The parameters of this law are tunable for limiting the mechanical stress. An appropriate sliding surface has been found in the speed-power plane, which allows the operation more or less close to the optimal regimes characteristic,...
The transfer lines dealt with in this paper are equipped with multifunctional spindle heads, capable to realize several operations in the same time (in parallel) on the same work-piece. Each such multifunctional spindle head is called a block and is fully described by its set of operations, operating time and cost. The reconfigurability concerns here the possibility of realizing a family of products...
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