Search results for "Mask"
showing 10 items of 506 documents
Adaptive ML-based technique for renewable energy system power forecasting in hybrid PV-Wind farms power conversion systems
2022
Large scale integration of renewable energy system with classical electrical power generation system requires a precise balance to maintain and optimize the supply–demand limitations in power grids operations. For this purpose, accurate forecasting is needed from wind energy conversion systems (WECS) and solar power plants (SPPs). This daunting task has limits with long-short term and precise term forecasting due to the highly random nature of environmental conditions. This paper offers a hybrid variational decomposition model (HVDM) as a revolutionary composite deep learning-based evolutionary technique for accurate power production forecasting in microgrid farms. The objective is to obtai…
Hybrid Three-Phase Transformer-Based Multilevel Inverter With Reduced Component Count
2022
The topology of the static synchronous compensator of reactive power for a low-voltage three-phase utility grid capable of asymmetric reactive power compensation in grid phases has been proposed and analysed. It is implemented using separate, independent cascaded H-bridge multilevel inverters for each phase. Every inverter includes two H-bridge cascades. The first cascade operating at grid frequency is implemented using thyristors, and the second one—operating at high frequency is based on the high-speed MOSFET transistors. The investigation shows that the proposed compensator is able to compensate the reactive power in a low-voltage three-phase grid when phases are loaded by highly asymmet…
Real-Time Detection of Incipient Inter-Turn Short Circuit and Sensor Faults in Permanent Magnet Synchronous Motor Drives Based on Generalized Likelih…
2022
This paper presents a robust model-based technique to detect multiple faults in permanent magnet synchronous motors (PMSMs), namely inter-turn short circuit (ITSC) and encoder faults. The proposed model is based on a structural analysis, which uses the dynamic mathematical model of a PMSM in an abc frame to evaluate the system’s structural model in matrix form. The just-determined and over-determined parts of the system are separated by a Dulmage–Mendelsohn decomposition tool. Subsequently, the analytical redundant relations obtained using the over-determined part of the system are used to form smaller redundant testable sub-models based on the number of defined fault terms. Furthermore, fo…
Life Cycle Assessment of a Battery Passenger Ferry
2017
Master's thesis Renewable Energy ENE500 - University of Agder 2017 Konfidensiell til / confidential until 01-07-2022
Design and Stiffness Analysis of a 5-axis Gantry-Tau Milling Machine
2018
Master's thesis Mechatronics MAS500 - University of Agder 2018 The Gantry-Tau is a Parallel Kinematic Machine (PKM) structure that possesses many advantages as a milling machine, where it has a low moving mass, high stiffness and a large workspace to footprint ratio. This thesis presents a new milling machine design based on this structure, as a continuation of a formerly constructed prototype, see [1]. This includes selection of new actuators for the linear drives as well as the development of a new tool platform and two joint concepts. A short workspace analysis is presented on the proposed design, which includes calculation of valid workspace and an analysis on the required joint mobilit…
Implementation of Wireless Sensors on Torque Wrench
2018
Master's thesis Mechatronics MAS500 - University of Agder, 2018 Konfidensiell til / confidential until 01.07.2023
Design, Modelling and Simulation of Electro-Hydraulic Self-Contained Cylinders based on Digital Hydraulics
2018
Master's thesis Mechatronics MAS500 - University of Agder 2018 Nowadays, hydraulic cylinders are mostly powered by a separate HPU and controlled by conventional servo and proportional valves. New trends have been under development the last years. The first trend is self-contained designs where the power unit is integrated in the cylinder design. Digital hydraulics is the second new trend where conventional flow control methods are replaced by simple ON/OFF valves and digital displacement pumps. A totally novel design would be a combination of the two mentioned trends. Designing a hydraulic cylinder that combines both the self-contained method and digital hydraulics is expected to results in…
Modelling of a hydro-pneumatic system for heave compensation
2017
Masteroppgave i mekatronikk MAS500 - Universitetet i Agder 2017 Testing of control systems on simulators has been found to be both cost and time e cient. To get good results from testing, a realistic response from the simulator is important. In this thesis, a mathematical model of a hydropneumatic heave compensation system for such purposes is proposed. The emphasis has been on developing a relatively simple model which is easy to run, but also accounts for important e ects like friction, non-ideal gas behaviour and temperature variation in the gas system. The mathematical model is veri ed against log data obtained from real drilling operations. Then, it is compared to simpler versions to i…
Secondary Control of a Digital Hydraulic Motor for Winch Applications
2018
Master's thesis Mechatronics MAS500 - University of Agder 2018 The reliable traditional hydraulic systems for industrial purposes is being challenged by an emerging technology called digital hydraulics. This technology shows promising improvements in regards to e ciency, especially in comparison to systems dependent on hydraulic pumps or motors with variable displacement. Digital hydraulic motors eliminate the need for a servo valve by connecting each individual motor cylinder directly to the high-pressure and low-pressure line by means of fast-acting on/o -valves. In this thesis, the potential of digital hydraulics is investigated by developing a control system intended for a digital displ…
Fault Diagnosis of an Electrical Winch based on Structural Analysis
2018
Master's thesis Mechatronics MAS500 - University of Agder 2018 This report covers development and implementation of a model-based fault-detection and fault diagnosis algorithm based on structural analysis, providing deeper knowledge of predictive maintenance, which o ers the industry increased uptime and reduced spending. Failure mode and e ect analysis are carried out at component level for an electrical winch. Construction of a Simulink model, used to verify the algorithms, are described in detail including governing equations and implementation. The basis of a structural analysis is outlined and tested on the electrical winch system. Results from the simulation model covers faults in per…