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In this paper, we propose a fuzzy chip controller for an intelligent sun tracking system. The integrated circuits used can be incorporated into a single 8051 chip. The intelligent system designed consists of the chip in conjunction with peripheral detection circuits. The system operates fully automatically in capricious environments. Errors that are typically caused by weather variations, or the ambient...
A single-phase isolated AC-DC converter is presented in this paper. The front semi-stage, which is a modified buck-boost converter, is used for power factor correction and is operated in discontinuous conduction mode (DCM) to achieve high power factor and low total harmonic distortion of input current. The rear semi-stage, which is a forward converter, is operated in DCM for step-down voltage conversion...
A hybrid genetic-ant colony algorithm (HGACA) has been presented for contingencies security optimal power flow (CSOPF) in this paper. The CSOPF can be divided into three steps involving security analysis, severest event selection, and preventive algorithm that called preventive CSOPF. The HGACA is integrated with genetic algorithm and ant colony algorithm, and the objective of GA is to improve the...
This study proposes a high-efficiency circuit for LED driving. The circuit combines an AD-DC flyback circuit, a DC-DC Boost LED constant current driving circuit and a battery charging circuit. The result demonstrated that the proposed circuit can successfully drive a white light LED module with high efficiency and low-light decline in a long period of operating time. In addition, the LED module can...
The study aims at seeking the interrelationship and origin of the basic electricity, mobile electricity, power adjustment charges, additional super-charges, and line subsidy payments of the high-pressure two-stage electricity users (Far East University), according to the average of monthly temperature and tariff structure calendar year. Using fuzzy theory to analyze and simulate the peak electricity...
This paper presents the design of a fuzzy sliding mode loss-minimization control for the speed of a permanent magnet synchronous generator (PMSG) and proportional-integral (PI) for the turbine pitch angle control. The PMSG speed uses maximum power point tracking below the rated speed, which corresponds to low and high wind speed, and the maximum energy can be captured from the wind. A sliding mode...
This paper presents a modified particle swarm optimization (MPSO) for the solution of the optimal power flow (OPF) with both continuous and discrete control variables that was called non-continuous optimal power flow (NCOPF). The continuous control variables modeled are unit active power outputs and generator-bus voltage magnitudes for traditional OPF, while the discrete ones are transformer-tap settings...
In this paper, a fuzzy logic controller (FLC) for a nonlinear system with uncertain perturbation is proposed. Based on the Lyapunov synthesis approach, we construct the FLC not only to stabilize the perturbed nonlinear system but also to guarantee a prescribed H∞ norm bound of the closed-loop transfer function from the disturbance to the controlled output. A given example illustrates the availability...
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