The increased focus on sustainability in response to climate change has given rise many new initiatives meet the building load demand. concept of distributed energy resources (DER) and optimal control supply power demands buildings have resulted growing interest adopt microgrids for a precinct or university campus. In this paper, model an actual physical microgrid been constructed OPAL-RT real-time simulation studies. SIT@NYP campus its weather data are collected serve as input run digital...

Summary While videolaryngoscopy has resulted in better overall success rates of tracheal intubation, airway assessment is still an important prerequisite for safe management. This study aimed to create artificial intelligence model identify difficult using a neural network. Baseline characteristics, medical history, bedside examination and seven facial images were included as predictor variables. ResNet‐18 was introduced recognise extract features. Different machine learning algorithms...

This article proposes a method for optimal placement of phasor measurement units (PMUs) to improve redundancy distribution in system under normal operating condition or presence contingency. The minimum number PMUs is determined using integer linear programming method, after which the optimized novel model represent level each bus. Weight parameters are assigned auxiliary variables, enables control priority different level. impact zero injection bus integrated into model, as well channel...

Uncertainties on both the source and de-mand side pose challenges for day-to-day management of distributed power systems, such as microgrids (MGs). To harness potential flexible scheduling within MGs to explore economic environmental advantages cooperative interactions between multiple MGs, this paper develops a two-stage power-sharing model day-ahead intraday operations across multi-MGs. The stage, which takes into account prediction errors caused by uncertainty, refines results factoring...

Medium/high-frequency transformer is an integral part of many power conversion systems. Switching at higher frequency results in lesser volume magnetics but induces winding loss density, on account increased eddy current effects conductors. Thus resistance a key parameter to characterize performance medium-frequency (MF) highpower (HP) transformer. In this paper, 10 kW, 0.5/2.5 kV, 1 kHz designs are presented employing different dispositions (normal and interleaved) conductor geometries...

Medium and high frequency, power transformers play an important role in footprint reduction along with their functions of galvanic isolation, voltage transformation all converters typically used traction systems, offshore wind plant converters, solid state transformer based distribution system grids. This art report analysis the various materials design tradeoffs that govern electromagnetic behavior loss mechanisms medium frequency applications. Typical winding core geometries have been...

A medium/high-power conversion system, using power electronic (PE) converter in conjunction with a medium/high-frequency transformer, has many desirable effects suitably oriented for modern system architecture. Switching at high frequency results lesser volume of magnetics but induces higher loss density. Thus design and characterization medium-frequency (MF) high-power (HP) transformer significant ramification on its performance application. Thermal management MF HP is one key aspects...

A medium/high-power conversion system using power electronic (PE) converter along with a medium/high-frequency transformer, offers many desirable features that are beneficial for present-day topologies. Leakage inductance is identified to be one of the key parameters characterize performances such medium-frequency (MF) high-power (HP) transformer. In this paper, existing analytical method calculate leakage concentric winding further refined employing mean turn length individual layer and...

To find balance among multiple design objectives of a medium/high-frequency (MF/HF) high-power (HP) transformer is best addressed employing an optimization technique. In this paper, MF HP formulated as multi-variable problem, where efficiency, power density and temperature rise are chosen objectives. Total loss, core volume maximum modeled respective cost functions amalgamated using weighted-sum approach to derive objective function. It minimized Steepest descent method. Being gradient-based...

The conventional active neutral-point-clamped (ANPC) multilevel inverters are popular for single-phase applications owing to their advantage of mitigating high-frequency common-mode voltage (CMV). With the ac neutral connected midpoint dc link, gain is restricted only half. For boosting output voltage, a two-stage structure by adding frontend dc–dc boost converter commonly used. This article investigates performance 5-level ANPC inverter and proposes an improved topology splitting dc-link...

Digital twinning concept is applied in various industry areas the wave of information and communication technology advancement. A digital replica a microgrid referred to as twin which can provide massive enhancement design, planning, optimization, forecasting, system reliability analysis, etc. models physical dynamics real assets with real-time simulation feed-through data from world sensors meters. Microgrid fulfill purpose creating test bed high fidelity that be used both academic parties...

The applications of the hard disk drive (HDD) in mobile and compact devices pose higher requirement on vibration-rejection capability HDD servo control. A novel vibration-compensation method is proposed this paper. It an add-on feedforward scheme, feature will be turned only specific vibration environment. scheme comprises two parts: detection through analysis sensor output, compensation feature. One major advantage over conventional methods applied that rejection some frequencies can...

Based on the established equivalent circuit model of a magnetostrictive vibration generator, low ac voltage and power produced by generator under acceleration are calculated. Comparisons between calculated measured results show that can provide reasonable data trends different loads. To boost to high dc required electronic devices in consumption, two energy extraction circuits (EECs) (i.e., proportion integration-based EEC an improved EEC) studied. The corresponding harvesting systems, which...

This paper examines Singapore Pulau Ubin microgrid to determine a daily operation management system. Since the grid is an islanded one it lacks connection national network, which would ensure ancillary services such as voltage support or power factor correction. The developed tertiary control system offers coordinated active-reactive optimization model for distribution network equipped with energy storage system, solar panel field and three biodiesel generators. aim minimize costs deviation...

This paper presents a new triple phase shift (TPS) closed-loop control scheme of dual active bridge (DAB) LCC resonant DC/DC converter to improve wireless charging power transfer efficiency. The primary side inverter angle regulates the battery current/voltage. secondary rectifier AC load resistance match its optimized setting. inverter-to-rectifier is set achieve unity factor operation DAB and inverter. mathematical formulation TPS given for each angle. analytical calculation, circuit...

Battery energy storage power stations (BESPS) play an important role in the flow regulation large-scaled micro-grids. It is proposed that static Var compensator (SVC) be replaced by BESPS through activation of its dynamic voltage (DVR) function so cost SVC can saved. An additional controller named coordination (ESCC) needed to support control algorithm DVR and coordinate individual battery system units. However, communication delay between ESCC commercial BESS units compounded difficulty...

The control of the active front-end rectifier three-stage solid-state transformer (SST) system is addressed in this paper.A comprehensive precharging sequence introduced for SST to limit inrush current during start-up process its nominal current.The proposed algorithm consists two phases, passive and precharging.The resistor limits precharging, while a ramp increase voltage reference used controller prevent large currents.Additionally, feedforward compensator added improve dynamic response...

This paper presents an effective two stage DAB charging-up control method for modular DC-DC converters with low voltage side common DC bus starting from zero. In 1st of charging, the controller is modified to allow variable duty cycle medium converter. this stage, a constant current applied so that link charged up linearly. 2nd charging control, normal dual and loops are applied. At end ready power regulation. The proposed applicable SST start-up application both grid tied standalone...

This paper presents a new method to build an accurate analytical dynamic model for switched reluctance motor (SRM). The parametric piecewise Hermite cubic spline function with combination of Fourier series is proposed as more expression fit the phase flux linkage/current/position characteristic data SRM. here universally applicable any type

In order to ensure the economic viability of micro-grids with diverse types distributed energy resources, there is need reduce maintenance costs and improve long-term reliability. A real-time condition monitoring system data analytics would be an important step achieving this objective. This paper introduces experimental health prognosis (CMHPS) for isolated micro-grid testbed located on a remote small island off main Singapore island. Within system, module level solar photovoltaic cell...

The behavior of PLL under usual and nonstandard operational circumstances is a vital facet, as the RES anticipated to function meet grid code requirement. This paper proposes positive sequence voltage normalization method be applied in conventional dq-PLL which normally used last stage positive-negative decoupled scheme. benefit this solution that it helps eliminate effect amplitude control loop bandwidth. Therefore, dynamic functionality scheme can improved dip conditions. proposed has been...

This paper presents an experimentally verified single-pulse-operation switched reluctance motor converter topology based on the basic buck-fronted and modified C-dump topology. Using only (n+1) power switches, this is able to achieve full single-pulse operation, thereby reducing switching losses acoustic noise. It also achieves a greater demagnetizing voltage compared topology, without having increase DC-source voltage. The more robust as its dump capacitor stops being charged if chopper...

This paper reports a method of evaluation the neighboring phase coupling effects switched reluctance motor (SRM) using dynamic modeling approach. The model SRM is developed few sets finite element (FEM) computed flux linkage/current/position data under condition simultaneous excitation two phases. combination piecewise Hermite cubic spline and Fourier series techniques used to represent each FEM-calculated linkage set. ready be incorporated with various converter topologies control...