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Uninterruptable power supply (UPS) applications require شa well regulated sinusoidal output voltage with low total harmonic distortion (THD). These requirements are achieved by model predictive control (MPC) of UPS inverter with LC filter on the output. The controller uses the model of the system to predict the future behavior of the controlled variables for all possible voltage vectors, and uses...
This paper discusses the rotor speed tracking loop configuration in maximum power point tracking (MPPT) in wind energy conversion system (WECS). A new loop configuration is proposed in which the aerodynamic torque is treated as an external disturbance. Internal model control and minimum variance control are used to achieve full disturbance rejection and exact reference tracking. Provided simulation...
This paper discusses the rotor speed tracking loop performance in maximum power point tracking (MPPT) in wind energy conversion system (WECS). A nontraditional loop configuration approach is used in which the aerodynamics torque is considered as loop disturbance. A generalized predictive control is used to achieve disturbance rejection and exact reference tracking. Penalty on control action change...
This paper proposes a line search numerical algorithm for Maximum Power Point Tracking (MPPT) in Wind Energy Conversion Systems (WECS). The algorithm maximizes the captured power objective function constructed via a mechanical acceleration estimator with no wind speed measurement necessary. Simulation results are included with varying wind profile, speed and air density to compare the proposed algorithm...
This paper proposes a new voltage regulator of the DC-bus capacitor of a variable speed wind energy conversion system based on an adaptive fuzzy system. The change in the fuzzy rule base is done using a variable-structure direct adaptive control algorithm to achieve the pre-defined control objectives. This algorithm has two merits. First, it has a good performance in the training phase as it makes...
This paper proposes two different approaches to design observer based regulators for T-S fuzzy models. The first approach has a discrete-time state feedback counterpart in the literature. Here, we derive appropriate LMI conditions for the continuous-time case. Furthermore, new LMI conditions are derived to facilitate the design of an observer- based regulator. The second approach generalizes the first...
The performance of fuzzy-logic power system stabilizer (FPSS), which is tuned automatically as the operating conditions of power system change, is investigated by applying it to a multi-machine power system. FPSS is developed using speed deviation and the derivative of speed deviation as the controller inputs variables. Two scaling parameters are introduced to tune the FPSS. These scaling parameters...
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