Abstract A new hybrid fuzzy controller for direct torque control (DTC) induction motor drives will be presented in this paper. The newly developed hybrid fuzzy control law consists of proportional-integral (PI) control at steady state, PI-type fuzzy logic control at transient state, and a simple switching mechanism between steady and transient states, to achieve satisfied performance under steady and transient conditions. The features of the presented new hybrid fuzzy controller will be highlighted by comparing the performance of various control approaches, including PI control, PI-type fuzzy logic control (FLC), proportional- derivative (PD) type FLC, and combination of PD-type FLC and I control, for DTC-based induction motor drives. The pros and cons of these controllers will be read more

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Abstract Fuzzy Logic control is considered for speed of wound rotor induction motors with slip energy recovery. The speed is limited at some range of sub-synchronous speed of the rotating magnetic field. Control speed by adjusting resistance value in the rotor circuit that occurs the efficiency of power are reduced, because of the slip energy is lost when it passes through the rotor resistance. The control system is designed to maintain efficiency of motor. Fuzzy logic control method is applied for self-tuning the system by keeping the speed constant and adjusting the rotor current appropriated to the load. The good transient response without overshoot can be obtained. Keywords: fuzzy logic control, wound rotor induction motor, slip energy recovery. Download read more

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Abstract This paper presents an application of fuzzy logic control to the distributed collector field of a solar power plant. The major characteristic of a solar power plant is that the primary energy source, solar radiation, cannot be manipulated. Solar radiation varies throughout the day, causing changes in plant dynamics and strong perturbations in the process. A special subclass of fuzzy inference systems, the TP (triangular partition) and TPE (triangular partition with evenly spaced midpoints) systems, is used to obtain adequate control signals in the whole range of possible operating conditions. The fuzzy logic controller has been tested in the real plant and results obtained are shown. A comparison with other control approaches widely used in the plant is performed using a read more

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Abstract This paper presents an application of a fuzzy logic control scheme for switched series capacitor modules to enhance overall stability of electric power systems. Through the signal conditioning of the measured real power flow at the location of the series capacitor modules, the phase/speed state of the electric power system is obtained to determine the number of capacitors energized at the state. The switching rules ate quite simple so as not to give heavy computation to the micro-computer utilized for the real time switching control of the series capacitor modules. A multimachine system is used to demonstrate the efficiency of the proposed switching control scheme, and coordination with power system stabilizers is considered. Keywords: Fuzzy logic control scheme, Real time read more

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