Angelica Mendoza-Torres

Stability of Gain Scheduling Control for Aircraft with Highly Nonlinear Behavior

The main goal of this work is to study the stability properties of an aircraft with nonlinear behavior, controlled using a gain scheduled approach. An output feedback is proposed which is able to guarantee asymptotical stability of the task-coordinates origin and safety of the operation in the entire flight envelope. The results are derived using theory of hybrid and singular perturbed systems. It is demonstrated that both body velocity and orientation asymptotic tracking can be obtained in spite of nonlinearities and uncertainty. The results are illustrated using numerical simulations in F16 jet.

Switched control for power management in hybrid propulsion schemes

This paper proposes an improved operation strategy for hybrid propulsion systems based on a switched control scheme. The goal is to investigate the role of switching criterion on fuel economy, based on a switched description of a fuel cell (FC) — batteries (B) propulsion scheme. Stability conditions of the closed-loop system are derived. A 1KW propulsion system is taken as a benchmark to illustrate the features of the proposed controller. The results show that by defining switching surfaces conveniently, similar results to those involving optimization can be obtained; simplifying in this way, the fuel economy problem to the election of off-line switching criterion parameters.

Hybrid control technique applied in a FC-SC electric vehicle platform

A Fuel Cell-Supercapacitor Electric Vehicle (FC-SC-EV) with only one power converter generally uses the FC as an average power unit and the SC as a peak power unit. This array requires operating the power converter linked to the FC in operation regions rather than single operation point; as a result traditional averaged modeling and control methods are no longer valid. In this paper, a hybrid control technique is proposed to control the power converter, which is cable to work in operation regions and it can use any inductor current in the converter as a feedback; meanwhile it achieves an excellent output voltage control under disturbances either from supply voltage, load voltage or other perturbations. Experimental results are given for a 1kW Nexa® power module and interleaved boost converter taken as a benchmark.

Switched control of interleaved converters

In this paper, a time varying switching control of interleaved converters is proposed. The controller has the feature of being simple and it is able to guarantee global voltage regulation. The controller is based on the piece-continuous model of the converter and it works by switching between performance surfaces that depends on the state vector. The switching surfaces are chosen differently for each cell of the interleaved converter in order to guarantee, both maximum current and voltage ripple. Furthermore, a given phase between current signals can also be guaranteed. The switched control is illustrated in a 2-cell 2kw boost converter: however, it can be applied directly in any interleaved converter independently of the number of cells.

A switching control strategy to tracking problem for a bidirectional DC/DC converter

This paper analyses and designs a switching control strategy for a bidirectional DC/DC converter based on a hysteresis-type control. The purpose of the controller is to control the power that the Ultra-Capacitor (UC) have to deliver or absorb according to the reference generated by an Energy Management System (EMS). Its efficacy is tested in regards to PI traditional controllers in order to highlight its high speed of dynamic response without generating overshoots avoiding stress on the components. The approach uses switched linear model instead of average model, therefore the use of techniques such as PWM can be avoided. Finally, simulations using the Matlab/Simulink environment, was carried out to demonstrate the proposed controller effectiveness, it can be observed that hysteresis-type controller performance is better than the PI traditional controller.

Study of performance of power train topology for electric vehicle

On the last years the electric vehicles have been broadly studied by industry and academic fields. Some of the research has been focused on the use of the regenerative braking. However, the majority of the works only take into account the recovery of the kinetic energy without taking into account the stability and safe braking. From this perspective, this paper presents an analysis to show that the design of a adequate power train topology allows a better utilization of the kinetic energy and safe braking. The benefits are featured using three standard driving cycles for a 1550 kg electric vehicle via simulations.