This paper presents a maximum power point tracking approach for photovoltaic system using the dividing rectangles algorithm. The new overcomes some weaknesses of existing methods such as perturb and observe method it is capable searching global maximum. particularly important that partially shaded. To validate performance proposed scheme, experimental studies have been conducted. results shown robust possesses fast speed.

The photovoltaic (PV) model is used in simulation studies to validate system design such as the maximum power point tracking algorithm and microgrid system. It often difficult simulate a PV module characteristic under different environmental conditions due limited information provided by manufacturers. In this paper, new approach using particle swarm optimization (PSO) with inverse barrier constraint proposed determine unknown parameters. method has been validated three technologies results...

In this paper, a zero-phase odd-harmonic repetitive control scheme is proposed for pulse-width modulation inverters. The controller combines an periodic generator with noncasual compensation filter. It occupies less data memory than conventional does. Moreover, it offers faster convergence of the tracking error, and yields very low total harmonics distortion (THD) error. Analysis design system are presented. Experimental results presented to validate approach. phenomena even-harmonic...

Deployment of large population sensors for sophisticated sensing and control in the industrial commercial infrastructures is a challenging research area. The use wireless sensor network (WSN) applications has attracted great deal interests today. Unlike office networks, environment networks are harsher due to unpredictable variations temperature, pressure, humidity, present heavy equipments etc. In this paper, we survey applications. interference other issues that could be encountered WSN...

State-of-charge (SOC) estimation is an important aspect for modern battery management system. Dynamic and closed loop model-based methods such as extended Kalman filter (EKF) have been extensively used in SOC estimation. However, the EKF suffers from drawbacks Jacobian matrix derivation linearization accuracy. In this paper, a new method based on square root unscented using spherical transform (Sqrt-UKFST) with unit hyper sphere proposed. The Sqrt-UKFST does not require nonlinear model uses...

In this paper, we explore the application of cooperative communications in ultra-wideband (UWB) wireless body area networks (BANs), where a group on-body devices may collaborate together to communicate with other groups equipment. Firstly, time-domain UWB channel measurements are presented characterize body-centric multipath and facilitate diversity analysis BAN (CoBAN). We focus on system deployment scenario when human subject is sitting posture. Important parameters such as pathloss, power...

The simultaneous tracking of the chest respiratory rate and amplitude human beings using a low-power ultrawideband (UWB) impulse radio signal is investigated for application sleep apnea monitoring. measurement amplitude, in addition to breathing rate, crucial assessment which requires, among other things, accurate estimation tidal volume per minute. Backscattered UWB signals from subject are detected time domain calculate displacements this paper. Since pulse disposition linearly related...

In this paper, a low-cost microcontroller-based system that uses the pedometer measurement and communication ranging between neighboring nodes of wireless sensor network for localization is presented. Unlike most existing methods require good connectivity, proposed works well in sparse network. As requires solving nonlinear equations real time, two optimization approaches, namely, Gauss–Newton algorithm particle swarm have been studied. The algorithms implemented with microcontroller....

Uninterruptible power supplies (UPSs) have been used in many installations for critical loads that cannot afford failure or surge during operation. It is often difficult to upgrade the UPS system as load grows over time. Due lower cost and maintenance, well ease of increasing capacity, parallel operation modularized small-power has attracted much attention recent years. In this paper, a new scheme inverters introduced. A multiple-input-multiple-output state-space model developed describe...

Wireless body area network (WBAN) is an interesting application of sensor networks which can revolutionize our interaction with the outside world. WBAN like any other suffers limited energy resources and hence preserving nodes great importance. Unlike typical WBANs have few dissimilar sensors. In addition, medium has its own propagation characteristic means that existing solution for in wireless might not be efficient WBANs. The quality links between changing frequently due to moving nature...

This paper proposes a pulse-coupled neural network (PCNN) with multichannel (MPCNN) linking and feeding fields for color image segmentation. Different from the conventional PCNN, pulse-based radial basis function units are introduced into model neurons of PCNN to determine fast links among respect their spectral feature vectors spatial proximity. The computing segmentation can be implemented in parallel on field-programmable-gate-array chip. Furthermore, results segmentations applied an...

Pulse width-modulated dc-dc converters are widely used in the renewable power systems. In practice, their reliability is of major concern. To identify converter system, Walsh-Hadamard transformation and recursive least square (RLS) methods some previous works. However, accuracy identified parameters degraded under measurement noise. this paper, a new approach for full parameter estimation buck proposed. The realized using biogeography-based optimization. Unlike traditional RLS method,...

Commercial photovoltaic (PV) modules are made of different PV cell technologies such as monocrystalline, multicrystalline, amorphous silicon, and copper indium diselenide. Usually, a singleor double-diode model is used to the output characteristic. However, it unclear which optimal for each technology modeling accuracy dependent on used. To fill up this research gap, generalized multidimension (n × m) diode proposed in paper determine model. The allows network be configured better fit...

This paper presents a new highly accurate gait phase detection system using wearable wireless ultrasonic sensors, which can be used in analysis or rehabilitation applications. The uses the foot displacement information during walking to extract following phases: heel-strike, heel-off, toe-off, and mid-swing. of foot-mounted sensor is obtained from several passive anchors placed at known locations by employing local spherical positioning technique, further enhanced combination recursive...

In this paper, a new model predictive control (MPC) approach suitable for high precision linear motion drive operating with repetitive tracking tasks is presented. For the proposed controller, feedforward controller of conventional MPC has been modified to provide zero-phase learning property. This achieved by augmenting reference trajectory phase-compensated term that updated historical error. The attempts combine merits both and schemes. Experimental results have demonstrated system...

Techniques that could precisely monitor human motion are useful in applications such as rehabilitation, virtual reality, sports science, and surveillance. Most of the existing systems require wiring restrains natural movement. To overcome this limitation, a wearable wireless sensor network using accelerometers has been developed paper to determine arm sagittal plane. The system provides unrestrained movements improves its usability. lightweight compact size node makes attachment limb easy....

In this paper, a new approach is proposed to estimate the location of sensor in wireless network. For estimation, only few anchor nodes with known locations and received signal strength (RSS) indicator (RSSI) are needed. It well that RSS reduces increasing distance between transceivers following nonlinear path loss model. Most published works determine these parameters offline. This often yields limited estimation accuracy due high variance RSSI measurements. To improve accuracy, estimated...

To increase the boost capability with minimum passive components, existing transformer-based Z-source inverter (ZSI) topologies require turn ratio to be increased. This results in larger transformer windings used high dc–ac voltage gain applications. shortcoming is addressed this study by introducing a sigma-ZSI (ΣZSI) that improves reducing leading lower winding transformer. The proposed topology compared TZSI as they same number of transformers and capacitors configured an X-shaped...

Accurate and reliable state-of-charge (SOC) estimation is an important task for battery management system in a satellite. Ambient temperature one of the significant factors that affect SOC estimation. Since satellite operates at different temperatures throughout orbit, it must be taken care accordingly to safeguard performance reliability. Moreover, depends on model accuracy as well. The parameters are affected by temperature, SOC, charging discharging rates. Hence, need updated improve...

Objective Vocal cord dysfunction/inducible laryngeal obstruction (VCD/ILO) commonly co-exists with asthma and can start after viral infections. In this setting evidence suggests that dysfunctional breathing may induce the disorder but possibility has not been researched. We therefore postulated VCD/ILO, more so in people

A plug-in digital repetitive learning (RC) controller is proposed to eliminate periodic tracking errors in constant-voltage constant-frequency (CVCF) pulse-width modulated (PWM) DC/AC converter systems. The design of the RC systematically developed and stability analysis overall system discussed. are forced toward zero asymptotically total harmonics distortion (THD) output voltage substantially reduced under parameter uncertainties load disturbances. Simulation experimental results provided...

The paper describes pulse-based ultra-wideband (UWB) radar microwave imaging experiments for breast cancer detection using phantoms with dielectric properties mimicking the human breast. Three homogeneous and seven heterogeneous are designed a series of permittivity variability used in tumor experiments. conducted time-domain pulse generator real-time oscilloscope.

Different types of photovoltaic (PV) cell technologies have been commercially used for various applications. These can be categorized as multi-crystalline, mono-crystalline and thin film. Due to the differences in PV technologies, a single model is unable all output characteristics. The double diode models widely modeling characteristic module. This paper introduces generalized multi-dimension which select most suitable dimension particular technology. results confirm that multi-crystalline...

This paper presents the study of a microelectromechanical system (MEMS)-scaled microthruster using ceramic as structural material. A vaporizing liquid (VLM) has been fabricated high temperature co-fired (HTCC) technology. The developed consists five components, i.e. inlet, injector, chamber, micronozzle and microheater, all integrated in chip with dimension 30 mm × 26 8 mm. In dry test, newly microheater which is deposited on zirconia substrate consumes 21% less electrical power than those...

The extended Kalman filter (EKF) has been widely used for attitude determination in various satellite missions. However, it requires an extensive computational power that is not suitable nanosatellite application. This paper proposes a gain-scheduled EKF (GSEKF) to reduce the requirement process. proposed GSEKF eliminates online recursive gain computation by analytically determining based on sensor parameters, such as gyroscope noise variance, quaternion observation matrix, and rotational...