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This paper proposes the utilization of One-Cycle Controller (OCC) for multi proposal tasks in photovoltaic (PV) systems that supply power to DC applications. The photovoltaic system proposed in this paper is composed of one PV panel and two DC-DC converters connected in series: one for track the maximum power point and the other to regulate the bus voltage for DC applications. Both of the converters...
Sentiment analysis has been adopted in several areas to gain insight into user feedbacks. Most existing approaches focus on explicit opinions whereas none contributes in implicit opinions expressed in Thai language. This paper presents a sentiment analysis framework in implicit opinions for Thai language. Evaluation results in representative domain of mobile device products show that the framework...
This paper presents a model predictive control (MPC) scheme for quasi-Z source (qZS) three-phase four-leg inverters. In order to cope with drawbacks of the traditional voltage source inverters (VSI)s, the qZS three-phase four-leg inverter topology is proposed in this study. To improve control capability of the controller, the MPC scheme is used. The proposed MPC is based mainly on the discrete-time...
Our aim of this study is to examine whether there are emotional differences in TV commercials that consumers watch favorably/unfavorably, using an electroencephalogram (EEG) and a questionnaire. With the advance of marketing research, neuromarketing has attracted rising attention, which allows us to know consumers' unconscious emotions. Among a great number of neuromarketing researches, we focus on...
Human hand functions range from precise-minute handling to heavy and robust movements. Developing an artificial thumb which can mimic the actions of a real thumb precisely is a major achievement. Despite many efforts dedicated to this area of research, control of artificial thumb movements in resemblance to our natural movement, still poses as a challenge. Most of the development in this area is based...
Due to the increasing size of offshore wind farm, the impact of the wake effect on energy yields become more and more evident. The seafloor topography would limit the layout of the wind farm so that irregular layout is usually adopted in large scale offshore wind farm. However, the calculation for the energy yields in irregular wind farm considering wake effect would be difficult. In this paper, a...
This paper presents a non-contact measurement of irradiance on plane of array (POA) and cell temperature for PV systems. The idea is motivated from the diode model of PV, where POA irradiance and cell temperature are proportional to the photocurrent and modified ideality factor, respectively. Based on the recent progress of diode model identification, the photocurrent and modified ideality factor...
Phase shifted carrier modulation is an industry standard in its application to multi-level H-bridge Converters. The major advantage of this scheme over level shifted and space vector modulation schemes is its inherent ability to evenly distribute losses between semiconductor devices. However, it has been demonstrated in literature that level shifted and space vector schemes have superior harmonic...
Building energy efficiency has increasing focus worldwide. The heating, ventilation, air-conditioning (HVAC) devices account for highest energy consumption in buildings in Singapore. Multipoint sensing information in the various scenario is critical to optimize the HVAC operation, and increase the energy efficiency of the air-conditioning. A software called FloVENT® is used for simulation of room...
In this paper, a novel multiphase multilevel open-end winding (OeW) drive is presented. The topology employs one three-level and one two-level voltage source inverter (VSI) to supply a five-phase OeW machine. Three-level VSI operates with low switching frequency, while the second inverter is used to mitigate unwanted low-order harmonics. Proposed drive requires one dc source only, for three-level...
We discuss the influences of electronic clinical pathways (ECPs) as a knowledge management system in a university hospital. We conducted a preliminary study wherein we analyzed records from the use of ECPs and interviewed eight nurses in charge of creating ECPs in their respective departments. We then conducted follow-up interviews with a chief nurse, another nurse, and four technical staffs. We found...
This paper introduces a discrete Wirtinger-based inequality to investigate the problem of delay-dependent stability analysis of networked control systems. Firstly, a discrete-time system with an interval time-varying delay is used to describe networked control systems with quality-of-service constraints. Then, by constructing a novel augmented Lyapunov-Krasovskii functional and applying the discrete...
The grid code Low Voltage Ride Through (LVRT) requires Renewable Energy Sources (RESs) to remain connected to the grid following the voltage sags resulting from disturbances. The LVRT pattern is based on voltage sag magnitude and its duration at Point of Common Coupling (PCC) and only voltage reflects the internal dynamics of RES. Therefore, making decision on RES connectivity to the grid just relying...
This paper presents a new three phase single tooth concentrated winding topology. With the new locally asymmetric configuration, each individual harmonic can be addressed, so operations with any number of pairs of poles are possible. Furthermore, the new arrangement of single coils presented here allows variations of winding characteristics such as winding factor, spectrum of the magnetomotive force...
This paper deals with the magnetic flux distributions when the shape of the primary-side power supply coil is changed to expand the charging area in a magnetic resonance power transmission system. In the conventional system, one primary-side power supply coil generally supplied to one secondary-side power reception coil. However, if the one primary-side power supply coil can supply to several secondary-side...
Inductive Power Transfer (IPT) is a promising solution for charging the electric vehicles (EVs). The first IPT systems (IPTSs) were needing a strong coupling between transmitter and receiver coils to achieve a satisfactory efficiency in the power transfer. Nowadays this drawback has been overcome by the resonant technology, which ensures an efficiency higher than 90% even with loosely coupled coils...
To verify the FEM simulation of the air-gap flux density, it is necessary to measure the flux density distribution as function of the angular machine position. This paper presents a scalable 3-D direct air-gap flux density magnitude measurement system for rotating electrical machines. A combination of eight linear Hall effect flux sensors and a rotary encoder is used to measure the flux density magnitude...
In this paper a robust predictive current control approach is developed to tackle the impacts of parameter variation in induction motors on the control performance. The robustness can be achieved in general model predictive control (MPC) by integrating the disturbance into the prediction model, which is estimated by an observer and whose effect is compensated to the system input or output. In such...
Due to the difference in the working condition and operating mode, permanent magnet (PM) traction motors design concept significantly differs from the traditional industrial motor. Optimization design of the PM traction motor with wide high efficiency range for electric vehicle (EV) application is investigated in this paper. Firstly, the basic design principle and dimension constraint are analyzed...
In conventional hybrid energy storage systems (HESSs), parallel bi-directional boost converters are used as interface between each storage system and the dc link. One of the disadvantages of the configuration is that during the energy transfer between two energy storage systems two converters are active which in turn lowers the overall efficiency. In this paper, a new multiple converter topology for...
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