Due to the robustness of sliding mode controllers (SMCs), especially against model uncertainties and disturbances, and also its ability in controlling nonlinear and multi-input multi-output (MIMO) systems; a DC motor sliding mode position controller design using fuzzy logic (FL) and proportional-integral-derivative (PID) techniques, is proposed in this paper. Also, due to system uncertainties that can lead to chattering phenomena in control law which can excite non-modeled dynamics and may damage the process, different approaches, like intelligent techniques, are used to minimize these effects. In this paper, the FL will be considered in the design of SMC. Also, a PID will be used in the outer loop in the control law then the gains of the sliding term and PID term are tuned on-line by a fuzzy system, so the chattering is avoided and response of system is improved against external load here. Presented simulation results confirm the above proposal and demonstrate the performance improvement to the example of DC motor.
This paper completes the previous work that introduced the analysis of the electromechanical wave propagation that follow a disturbance occurring at any machine in the one-dimensional ring power system model. The analysis is performed for the varying of damping constant (D) and rotor inertia constant (M) of the system machines. The continuum principle, which considered for the power system leads to a set of nonlinear partial differential equations (PDE). So, the discretization concept was applied in this paper. MATLAB package is used to carry out the simulation. From which, some of the wave propagation parameters are calculated. Simulation results in different situations are presented and discussed. These results present and show the important effect of damping constant and rotor inertia constant on one-dimensional ring power system electromechanical wave propagation.
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