In this study, the performance of fault tolerant single-phase capacitor start capacitor run induction motor powered using seven-level quasi-impedance source inverter (qZSI) is analysed. The seven-level inverter consis...
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In this study, the performance of fault tolerant single-phase capacitor start capacitor run induction motor powered using seven-level quasi-impedance source inverter (qZSI) is analysed. The seven-level inverter consists of three units of qZSI connected in cascade. When one of the qZSI module fails (due to semiconductor failure), the resultant rms voltage applied to the motor will be reduced by one-third. This leads to reduction in both mechanical speed and electromagnetic torque of the motor. To restore the performance of the motor to pre-fault condition, the voltage deficit must be compensated. In conventional CHB inverter, it is not possible to achieve the pre-fault voltage. However, in qZSI, it is possible to achieve required voltage boost by application of shoot through duty cycle. Here, voltage of other two healthy operating modules can be boosted to reach pre-fault inverter output voltage during post-fault condition. The maximum voltage boost achievable is limited by the maximum shoot-through duty cycle which is related with modulation index. To verify the concept, simulation results of single-phase capacitor-start capacitor-run induction motor with or without proposed control algorithm are discussed. Experimental results for the proposed algorithm with RL load are discussed.
This work consists of a contribution to the artificial pancreas (AP) development by introducing new techniques of control based on an acceleration of reference tracking by using a variable penalisation of the cost fun...
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This work consists of a contribution to the artificial pancreas (AP) development by introducing new techniques of control based on an acceleration of reference tracking by using a variable penalisation of the cost function instead of fixed and arbitrary penalisation, two new functions of the weighting factors are introduced in the formulation of the control algorithm. This method allows a rapid rejection of meal disturbance, a reduction of glucose peak and a complete avoidance of hypoglycaemia. The developed controller performances are evaluated in silico test which is equivalent to animal test using the UVa/Padova simulator.
This article presents a synchronous rectification scheme using a six-phase Lundell alternator and a bespoke MOSFET-based active rectifier. The control of the alternator-rectifier system is divided into the hysteresis ...
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This article presents a synchronous rectification scheme using a six-phase Lundell alternator and a bespoke MOSFET-based active rectifier. The control of the alternator-rectifier system is divided into the hysteresis DC-link voltage control and the switching pattern algorithm. The first allows to keep the DC-link voltage at the required 14V level, while the latter reproduces the same switching pattern as that of a passive rectifier. The system is tested at three different speeds and the results are compared against the body diodes of the MOSFETs in the active rectifier. The harmonic analysis of the generated waveforms indicates the capability of the control algorithm to generate the same switching pattern of a passive rectifier. Finally, the efficiency measurements illustrate a significant efficiency improvement using a synchronous rectification scheme and MOSFETs with low on-resistance.
During the past several years, significant effort has been made to develop a robotic system to harvest fresh market apples in a modern apple orchard at Washington State University (WSU). This system has gone through s...
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During the past several years, significant effort has been made to develop a robotic system to harvest fresh market apples in a modern apple orchard at Washington State University (WSU). This system has gone through several modifications to achieve enhanced system accuracy, speed, robustness, and reduction of fruit damage and cost. However, due to the short window of apple picking each year and the challenging environment of the orchard, those modifications had limited success in improving the robotic systems performance even with extensive laboratory testing before each field trial. To further assess potential problems, better prepare for the field trial, and make best use of the limited time in the field, in silico testing is necessary in addition to laboratory testing. In this work, computer modeling and simulation were used to help identify potential problem in the robotic system, evaluate the effectiveness of the newly made modifications, and aid in both algorithm development and configuration design of the system. By doing simulations with field study data and workspace analysis of the system, we developed a novel algorithm to improve the reachability of the picking arm. We also concluded that the overlap of the arm's workspace and the fruit space is the key in deciding the reachability of the manipulator instead of the volume of arm's workspace. (C) 2018, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.
In this paper,a ring inverted pendulum system is *** rotating arm is driven by a motor to move back and *** the pendulum rod to do reciprocating motion perpendicular to the *** controlling the pendulum bar from the ve...
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In this paper,a ring inverted pendulum system is *** rotating arm is driven by a motor to move back and *** the pendulum rod to do reciprocating motion perpendicular to the *** controlling the pendulum bar from the vertical state to the vertical state,the validity of the control algorithm is *** show that the system can realize the stability control of inverted pendulum and is used to study the effectiveness of the algorithm.
The restrictions imposed on real-time functioning are sometimes particularly severe and require firm action. At the same time, the design of the control algorithms for perturbations rejection includes a multitude of t...
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ISBN:
(纸本)9781538644447
The restrictions imposed on real-time functioning are sometimes particularly severe and require firm action. At the same time, the design of the control algorithms for perturbations rejection includes a multitude of theoretical and practical solutions that exist in the literature. Here, we can note the methods based on robustification, on algorithms with specific degrees of freedom, etc. The paper presents a method based on the very rapid switching of the control algorithms, proposing at the same time a new switching method. The solutions proposed are tested on an MIMO process in a real time application in the vehicle control area.
The unified power quality conditioner (UPQC) with injection of voltage with respect to supply current at definite angle (UPQC-S) exhibits unique characteristics as opposed to the injection of voltage in-phase (UPQC-P)...
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ISBN:
(纸本)9781538611388
The unified power quality conditioner (UPQC) with injection of voltage with respect to supply current at definite angle (UPQC-S) exhibits unique characteristics as opposed to the injection of voltage in-phase (UPQC-P) or in-quadrature (UPQC-Q) of the supply current. The UPQC-S comprises series and shunt converters. The series converter shares the reactive powers of shunt converter and reduces burden of UPQC under normal operating conditions. The reactive power sharing of a series converter depends on phase angle and, therefore, it has been optimized to minimize the VA size of the UPQC-S. In this work an algorithm is proposed to minimize the VA size of the UPQC-S. The optimized angle is verified using graphical approach under different power factor of the load and also under different voltage sag. Moreover, optimized VA size of UPQC-S is compared with the UPQC-Q and UPQC-P for 0% to 50% of the voltage sag. A comparative analysis is presented to understand the worth of various control approaches of the UPQC. A comprehensive mathematical evaluation is also presented under normal and voltage sag/swell conditions of the AC mains.
Studying on PID control algorithm and through the analysis of the control parameter of scalar part, integration part and derivation part, the author investigates systematically on the motion control system of the inte...
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ISBN:
(纸本)9783037855034
Studying on PID control algorithm and through the analysis of the control parameter of scalar part, integration part and derivation part, the author investigates systematically on the motion control system of the intelligent robots in small storage and logistics, and presents an improved PID control algorithm. The improved PID control algorithm not only maintains the merits of the original one, but also simplifies the multifarious adjustment process of the control parameters of scalar part, integration part and derivation part. The improved algorithm turns out to be effective after the simulation and verification by the MATLAB and can be applied and promoted to other practical controls field.
An embodiment of the structure and control algorithm of the isolation valve of multi-section mobile car refueling. It is shown that this option provides the most energy efficient and rational option for refueling cons...
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An embodiment of the structure and control algorithm of the isolation valve of multi-section mobile car refueling. It is shown that this option provides the most energy efficient and rational option for refueling consumers. The calculation of the most rational pressure, number and volume of sections is performed. The algorithm of control is based on the modified algorithm of multicriteria selection of the Edgeworth-Pareto. (C) 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the 9th Annual International Conference on Biologically Inspired Cognitive Architectures.
With the rapid development of the society, space utilization is constantly increasing, and the building height is also increasing rapidly, the problems of wall surface cleaning, damage detection and equipment maintena...
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ISBN:
(纸本)9781538655009
With the rapid development of the society, space utilization is constantly increasing, and the building height is also increasing rapidly, the problems of wall surface cleaning, damage detection and equipment maintenance are coming up. Using robots to replace human tasks can not only reduce the risk and cost but also improve the efficiency of the operation. Glass wall cleaning robot with negative pressure type double suction cup can move smoothly by sliding friction between suckers and glasses, therefore, by studying a reliable control algorithm, the robot can be controlled to move smoothly on the glass wall, at the same time, the glasses can be cleaned by the cleaning devices. In order to solve the obstacle avoidance and balance problem, a glass wall cleaning robot controlled by ATMEGA128A is proposed. Through designing the core algorithms such as mobile module algorithm, adsorption system algorithm etc., the robot can complete the scheduled cleaning tasks. The experiments of the designed glass wall cleaning robot prototype show that this glass wall cleaning robot designed here can clean wall, which can meet the realization requirements, and the given control algorithms are fast and stable.
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