This paper aims at increasing the efficiency of the plug-in hybrid electric vehicle (PHEV) by using rotatable solar panel. Conventionally, the PHEV with solar panel has a critical problem of putting on the roof of a PHEV. Since the limited space on the roof of the vehicle is not large enough, rotatable structure is considered to track the sunlight by mechanical petri-net (PN)-based maximum power point tracking (MPPT) control. A stepping motor is used to control the rotating angle of the rotating solar panel. In addition, the electric MPPT with orthogonal particle swarm optimization (OPSO) method is also included. With the dual mechatronic MPPT with PN+OPSO control algorithms, the maximum power in a limited roof space of the vehicle is possible. The solar panel has not to be very large. This will increase the efficiency of the PHEV. It is convinced that the proposed dual mechatronic PN+OPSO MPPT controllers are helpful to the PHEV system. Index Terms-Maximum power point tracking (MPPT), orthogonal particle swarm optimization (OPSO), petri nets (PNs), plug-in hybrid electric vehicle (PHEV).
This paper proposes a FPGA controller design of a driver circuit based Petri nets for the Plasma Display Panel (PDP). In such a driver circuit, complicated control logic is required in the PDP sustainer circuit to implement the sustaining voltage waveform. The control logic has the zero-switching behaviour for the driver circuit to provide better efficiency for the driving circuit. Conventionally, the VHDL programmer does not have a systematic way to program the control logic. Time delay problem of logic components in logic controller may occur under high frequency operation. With the help of the proposed Petri nets approach, the VHDL programming for the PDP driver circuit can be easier in a systematic way. Also, this paper illustrates three types of sustainers with Petri nets based FPGA controller. The basic full-bridge and full-voltage sustainers are used to compare the performance with the proposed half-voltage sustainer. Details of the circuit operation are described. From the experimental results, the performance such as efficiency, luminance, and gamma curve are assessed to show the effectiveness of the proposed half-voltage sustainer. It is believed that the proposed Petri nets based control circuit is very powerful for the practical application of the PDP sustainer circuit.
Pm^sicAL REQUIREMENTSThe recent trend is for equipment which offers greater rehabihty, longer life, and which requires less maintenance consist ent with smah size and light weight. Excessive temperature rises in the rotat ing equipment are being avoided. The aircraft type of control devices such as relays and contactors are usually em ployed. The static magnetic-amplifier type of regulating equipment is fast re placing the electronic and electrome chanical types. It is expected that static type systems will continue to replace d-c generators and d-c exciters, thus lessen ing maintenance problems.
The fuzzy dominant directed graph (fuzzy DDG) method is proposed in this paper to realize the multi-objective optimal mechanical turbine power of a river current (RC) power generation system. The testing case illustrates the problem with vertex S/N ratio values included. Fuzzy potential values are derived. The experimental results are provided to verify the validity of the fuzzy-DDG method. It is clear that this method is applicable; it easily and quickly finds the optimal solution.
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