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An alternative way to control a nonlinear system, such as a two Degree Of Freedom helicopter, is the linearization of the model around an equilibrium point, in this case, an equilibrium point around the Pitch angle. Subsequently, the design a Robust Controller for this system is done, using a the DK iteration method. However, when a variation of an angle such as its uncertainty is modeled, the performance...
This paper deals with architecture and algorithm design of networked control systems (NCSs) to cope with network outages. A Networked PID controller and an internal model control based tuning scheme is proposed, using the jitter margin to ensure stability despite dropped packets. For longer periods of disconnection, an outage heuristic is proposed. The control design and outage heuristic need only...
This paper presents a nonlinear fault detection and isolation system that is able to distinguish single faults that have the same fault signatures. The detection mechanism is based on nonlinear state estimation. Fuzzy set theory followed by parameter estimation of certain parameters of the fault-free model are applied for fault isolation. This parameter estimation step is used to differentiate between...
In this paper, the application of the Sliding Mode Theory, in terms of observer and control design, to the DC-DC Single-Ended Primary Inductor Converter (SEPIC) is investigated. The choice and influence of the sliding surface regarding the state vector is presented. Usual sliding surfaces chosen to control other high order DC-DC converters are found not to work on the SEPIC. Thus, other surfaces are...
A simple method of for observer-based design of pulse-frequency modulated (PFM) control systems is presented. The method consists of first designing a conventional observer-based control system, and then placing a pulse-frequency modulator in the control path, feeding back the PFM signal to the observer. The stability of systems designed by this method is discussed, and the method is illustrated by...
This paper proposes a new algorithm for actor-critic method using online support vector regression(SVR), which can do incremental learning and automatically track variation of environment with time-varying characteristics. It gives good generalization properties to value function approximation and helps the critic converge fast. In addition, sample vectors in data set of the online SVR are used as...
Universal inverters will be the future interface of distributed generation to power systems based on active distribution grid where island operation should be allowed. Universal inverters should be able to work both connected to the grid both in island mode. A self-commissioning process based on advanced optimization algorithms should tune the parameters of the controllers to manage the different...
Renewable energy technologies have recently attracted great attentions. Several renewable energies such as wind, solar, etc. are now being investigated to solve the current energy crisis. In this paper, a novel control strategy for variable speed wind turbine to extract the maximum power from wind is proposed without knowing any of the system parameters and the aerodynamics. Lyapunov stability analysis...
The Frequency-Shaped Sliding Surface Control (FSSSC) has been recently applied to the Active Vibration Isolation System (AVIS) and the robust skyhook performance is experimentally validated. However, the performance of this approach is theoretically limited by the sensor dynamics. This paper generalizes the FSSSC approach as a two-step AVIS control design method. The first step is to design the sliding...
This paper proposes safety function in control laws to reduce the frequency of events that a physical value in a control system deviates from its normal operating-range. This safety function is realized mainly by the safety ability to suppress the fluctuations of transient responses after a device failure in order to prevent the deviations from the normal operating-range on the basis of dependability...
This paper is concerned with the stability of linear systems with interval time-varying delays arising from networked control systems (NCSs). The Jensen integral inequality is first generalized into a new inequality to overcome the limitation of applications. Then a novel delay-dependent stability criterion is derived by combining the generalized Jensen integral inequality and the convex combination...
An integral observer with a compensator based on orthogonal neural networks is proposed for a class of chaotic systems when the output of the system is perturbed and the nonlinear portion of the system is unknown. The designed method achieves chaos synchronization using integral observer theory and the nonlinear approximation ability of the orthogonal neural networks based on the linear portion of...
This research enhances the previous control method by utilizing an embedded controller (EC) to create a fuzzy logic controller (FLC) to reduce the power consumption of a notebook or netbook and to lengthen the battery life. Our control methods are all written in assembly language, so that there is no need to rely on any high-level application program for the FLC. Thus our design has greater efficiency...
Harmonic currents generated from the power electric equipment such as IH cooking heaters involve harmful influences to the other equipments connected to the utility grid. As for the IH cooking appliances, adding the PFC converter to the input stage of IH cooking heater is one of the practical solutions to suppress harmonic current influences. In this paper, two operation modes; DCM and CCM for the...
This paper studies three fundamental switching patterns for resonant converters to achieve Zero Voltage Switching (ZVS) operation. To evaluate the performance of the three control methods, three resonant topologies are taken into consideration: series resonant, parallel resonant and series-parallel resonant. The criteria functions for ZVS operation are derived for each control method and topology...
In this paper, a series of power-sharing strategy based on networked control for parallel-connected inverters is introduced. In order to enhance robustness of system, a novel data processor is proposed. By means of controlling control data flow, the different power-sharing methods are scheduled depending on communication situation and system operational state. Therefore, even in the case of module...
This paper proposes a Class D current-source resonant boost converter, which is controlled with the 1-bit delta-sigma modulator. The 1-bit delta-sigma modulator, which is an analog to digital (A/D) converter for digital audio amplifiers, generates a 1-bit (1/0) signal based on the input signal. This `periodical' output signal has an advantage in driving resonant converters. Class D voltage-source...
Capacitive Power Transfer (CPT) technology has been proposed and investigated recently as an alternative contactless power transfer method which has the advantages of being able to transfer power across metal barriers and causing low power losses in metal surrounding circumstances. However, more fundamental researches are needed to guide CPT coupling analysis and design. Based on the Duality Principle,...
This paper proposes a direct power control of a two level active front-end rectifier, which in contrast of standard implementation, the starting angle of each sector is variable (VSA-DPC). Depending on operation conditions the applied switching state could not produce the active and reactive power variation required to reach the power references, moreover it can produce the opposite effect. Using...
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