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We consider a variant of the time-optimal control of the acrobot and term it sub time-optimal. By exploiting the partially linearized structure obtained through a feedback linearization technique, we swing up the first link to the vertically upright position in optimal time and then stabilize the second link around its vertical equilibrium position. Rate constraints are imposed on the actuator and...
Sufficient conditions of the exponential mean-square stability of a linear stochastic hybrid system with multiplicative noises and the random switching rule are derived. A hybrid system with linear stable and unstable parts with stochastic structures is considered. To analyze the exponential mean-square stability the differential equations for the covariance matrices of solutions are used.
This paper addresses the design of a fault detection and reconfigurable control structure for bimodal piecewise affine (PWA) systems. The PWA bimodal system will be designed to verify input-to-state stability (ISS) in closed loop. The proposed methodology is divided into two parts. First, a Luenberger-based observer structure is proposed to solve the fault detection and identification (FDI) problem...
This study proposes a sliding mode control (SMC) framework for the reconstruction and rejection of mismatched and matched unknown disturbances. First, a robust proportional-integral (PI) type controller is designed for dealing with an uncertain scalar system subject to matched disturbance. Then, a 2nd order uncertain system subjected to both matched and mismatched disturbances is discussed. By incorporating...
The objective of this paper is to investigate a control method for systems with discrete inputs that have switch related cost. For such systems, the control objective often is a trade off between the deviation from the reference (performance) and the number of switches (weariness, energy efficiency etc.). For such systems a steady state might never be attained, but rather the optimal behavior might...
In this paper, a disturbance attenuation problem for a class of hybrid control systems is posed when the switching from a vector field (also called mode) to another is controlled. Using the equivalence between this problem and a linear-quadratic differential game with piecewise deterministic dynamics, a solution is proposed to this problem.
In this paper a very high gain step up DC-DC converter is proposed. Maximum voltage gain in conventional boost converter like, switched inductor converter, switched capacitor converter, cascaded boost converter etc. are limited due to extreme duty cycle (i.e. duty cycle near to unity). Operation at extreme duty cycle leads to, serious reverse recovery problem at the switches, high conduction losses,...
An improved estimation method for a class of nonlinear hybrid systems has been proposed in this paper using a self-switched R-adaptive Extended Kalman Filter. The term ‘estimation of a hybrid system’ implies state estimation as well as mode estimation of a plant. In hybrid systems, where modes are determined by the output variables, the mode determination may become erroneous due to inaccurately known...
Switched reluctance machines with its uncomplicated structure, low cost, high reliability and fault tolerance, is struggling to gain higher market share almost in all electric machinery utilities. Its simplicity encouraged researchers to apply a wide variety of classic and intelligent control techniques. These techniques are used to control the speed and torque via appropriate determination of switching-on...
The optimal pipeline analog to digital converter (ADC) architectures are analysed to determine the optimal partitioning and particular bits per stage for power optimization purpose. It is found in our design that the multi bit partitioning with 2.5 bits per stage resolution, is optimum in terms of power consumption compare to the 1.5 bits per stage for an 8-bit pipeline ADCs circuit. The optimal partitioning...
Potential of bidirectional Split-Pi converter is yet to be exploited. Its unique features like bidirectional property, option to employ in multiphase systems and smaller ratings of passive elements provides liberty to use it in applications demanding high power density such as in hybrid electric vehicles, renewable energy, aerospace, military etc. In this paper dynamic model of Split-Pi converter...
A detailed small signal analysis and a closed loop control design of naturally commutated current-fed dual active bridge (CFDAB) dc/dc converter are presented. Proposed converter is suitable for fuel cell vehicle between traction inverter and batteries. State-space averaging technique is used to derive the small signal model. A closed two-loop controller is designed and implemented on mixed signal...
In Software Defined Networks (SDN), more packet fields are included to design fine-grained policies. These policies are stored as entries in switch Flow Table. However, fine-grained policies cause the scalability issue as a single flow entry needs larger storage space and a significant number of flow entries need to be stored, but the Flow Table is limited due to the constraints of Ternary Content...
The low and medium voltage renewable energy based dc distribution systems are catching increased attention world-wide due to their inherent benefits over ac systems. Higher efficiency, simple control, more suitable for integration of the sources producing dc power, are some of the main benefits of the dc systems. However, these systems are prone to serious stability issues caused by the constant power...
A physical electro-thermal model that describes bipolar resistance switching in Nb2O5-based memory devices is presented based on the finite element method. The switching mechanism is assumed to be controlled by the diffusion and drift of oxygen vacancies in conductive filaments (CFs). The proposed model correctly describes the microscopic morphology of the CF during the gradual reset transition, which...
In this paper a new time dependent pricing scheme is proposed for revenue management in mobile calls. The proposed scheme considers many essential parameters that affect pricing such as time-of-day seasonality, weekday/weekend seasonality and price demand elasticity for call arrivals and call duration. In this model, each day is partitioned into a number of periods; each period has a price according...
This paper presents a configuration for the high gain boost converter with coupled inductor and switched capacitor and also gives the improved version for the proposed configuration. The proposed converter has wide input voltage band-width due to its high gain feature. The given converter also has optimum number of components that are optimally utilized. The proposed converter uses coupled inductor...
Harmonic elimination pulse width modulation (HEPWM) method has been widely applied to improve the harmonics profile of the multilevel voltage source inverter (MVSI). However, the computation of the HEPWM switching angles for MVSI is very challenging due to the non-linear and transcendental nature of the equations. With the proliferation of low cost and powerful computers, the soft computing (SC) approach...
Generally, selective harmonic elimination (SHE) complexity for multilevel inverters increases with the increase in number of levels. In this paper, a novel approach for SHE is introduced. This approach is based on cancelling the 5th and 7th order harmonics irrelevant of the number of levels in threephase multilevel converters, such that the solution for the angles required for the proposed SHE mimics...
This paper presents a novel switched-capacitor (SC) DC-DC converter that incorporates three conversion topologies. At 100 kHz, the design is proposed to cater to wide input range, of 2.5 V to 4.5 V. Excellent accuracy and output regulation capabilities are obtained with output ripple voltage and error of < 6 mV and < 1.3%, respectively, when operated with a fixed output voltage of 1 V. A proportional-integral...
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