In this paper, by employing thermal characteristic modeling to the main components of the vehicle model for example, engine, transmission and battery, we examine the heat energy management and fuel consumption of the ...
详细信息
One of the advantages of model predictive control is its ability to take optimal account of information about future setpoint changes in the design of the control law. However, it is easy to show that the default opti...
详细信息
The present work deals with the improvement of OWC-Wells turbine-generator systems by adequately choosing the applied control scheme. For this purpose, two different control strategies are presented and compared. In t...
详细信息
ISBN:
(纸本)9781424474264
The present work deals with the improvement of OWC-Wells turbine-generator systems by adequately choosing the applied control scheme. For this purpose, two different control strategies are presented and compared. In the first one, the controlsystem does appropriately adapt the slip of the induction generator according to the pressure drop entry. The second control strategy consists of a traditional control of the OWC air valve. It is demonstrated that the proposed rotational speed control design adequately matches the desired relationship between the slip of the induction generator and the pressure drop input, whilst the valve control using a traditional PID controller successfully governs the flow that modulates the pressure drop across the turbine.
In this paper an observer-based fault detection approach for a class of nonlinear systems, which can be modeled by Takagi-Sugeno (TS) fuzzy models, is presented. We propose a sliding mode fuzzy observer that deals wit...
详细信息
ISBN:
(纸本)9781424477456
In this paper an observer-based fault detection approach for a class of nonlinear systems, which can be modeled by Takagi-Sugeno (TS) fuzzy models, is presented. We propose a sliding mode fuzzy observer that deals with unmeasurable premise variables, bounded uncertainties in the plant and allows fault estimation based on an equivalent output error injection approach. Necessary conditions for the existence of the robust observer are derived from sliding mode theory [10]. Stability is ensured by linear matrix inequality (LMI) based sufficient conditions. An illustrative example demonstrates the effectiveness of the proposed scheme.
We have developed electro-thermal 3D transient simulations in order to design an optimized heater for preconcentration membranes. An evaluation of parameters of simulation and boundary conditions have been done. We ha...
This paper presents a method for the estimation of thrust model parameters of uninhabited airborne systems using specific flight tests. Particular tests are proposed to simplify the estimation. The proposed estimation...
详细信息
This paper presents a method for the estimation of thrust model parameters of uninhabited airborne systems using specific flight tests. Particular tests are proposed to simplify the estimation. The proposed estimation method is based on three steps. The first step uses a regression model in which the thrust is assumed constant. This allows us to obtain biased initial estimates of the aerodynamic coefficients of the surge model. In the second step, a robust nonlinear state estimator is implemented using the initial parameter estimates, and the model is augmented by considering the thrust as random walk. In the third step, the estimate of the thrust obtained by the observer is used to fit a polynomial model in terms of the propeller advanced ratio. We consider a numerical example based on Monte-Carlo simulations to quantify the sampling properties of the proposed estimator given realistic flight conditions.
In this paper, a hierarchical multirate control scheme for nonlinear discrete-time systems is proposed, composed of a robust model predictive controller (MPC) and a multirate integral sliding mode (MISM) controller. I...
In this paper, a hierarchical multirate control scheme for nonlinear discrete-time systems is proposed, composed of a robust model predictive controller (MPC) and a multirate integral sliding mode (MISM) controller. In particular, the MISM controller acts at a faster sampling time than the MPC controller, and reduces the effect of model uncertainties and external disturbances, in order to obtain, at the next sampling instant of the MPC controller, a value of the system state that is as close as possible to the nominal one. To obtain this result, the control variable is composed of two parts: one generated by the MPC controller, and the other by the MISM controller. The a-priori reduction of the disturbance terms turns out to be very useful in order to improve the convergence properties of the MPC controller.
In this paper, an optimized fractional order conditional integrator (OFOCI) is proposed. The key feature of this OFOCI is that, the fractional order alpha and the parameter k for the "hold" value in the cour...
详细信息
ISBN:
(纸本)9781424474264
In this paper, an optimized fractional order conditional integrator (OFOCI) is proposed. The key feature of this OFOCI is that, the fractional order alpha and the parameter k for the "hold" value in the course of integration can be tuned following the analytical optimality design specifications, to achieve the optimized performance not achievable using integer order conditional integrators. The proposed optimality specifications are given to satisfy the desired phase delay, and minimize the preferred magnitude ratio, which can be calculated from the high order harmonic magnitudes divided by the magnitude of the fundamental wave. The numerical solution of calculating the optimized parameters alpha and k of the OFOCI is introduced. The phase delays and magnitude ratios of four designed OFOCIs are compared with the integer order conditional integrators. Simulation results with the FFT spectra are also presented to validate the theoretical analysis.
Microgrids are key elements to integrate renewable and distributed energy resources as well as distributed energy storage systems. In the last years, efforts toward the standardization of these microgrids have been ma...
详细信息
Microgrids are key elements to integrate renewable and distributed energy resources as well as distributed energy storage systems. In the last years, efforts toward the standardization of these microgrids have been made. In this sense, this paper presents the hierarchical control which consist of three levels: i) the primary control is based on the droop method, including an output impedance virtual loop; ii) the secondary control allows to restore the deviations produced by the primary control; and iii) the tertiary control manage the power flow between the microgrid and the external electrical distribution system. Results from a hierarchical-controlled microgrid are provided to show the feasibility of the proposed approach.
暂无评论