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The neutral-point potential control is very difficult for the NPC three-level converter. This paper proposes an accurate model of the NPC three-level converter with parametric perturbation. The developed model mathematically describes that the basic reason for the neutral-point potential drift is the unbalanced distribution of active power caused by parametric perturbation. By injecting zero-sequence...
Nowadays, the use of a distributed generation (DG) has increased because of the benefits such as increased reliability, reduced losses, and improvement in the line capacity and less environmental pollution. The protection of microgrids, which consists of generation sources, it is one of the most crucial concerns of basic distribution operators. One of the key issues in this field is the protection...
With the increasing of packaging and power density and the reduction of the packaging size, the optimization placement of components becomes a key role on thermal management of the multiple components modules. In this paper, a novel algorithm based on thermal force-directed placement algorithm (TFPA) is proposed, with improved thermal force model and the consideration of the components' size effect...
The operating theory of single-phase two-level pulse width modulation (PWM) rectifiers is analyzed and the mathematical model is established. In order to reduce switching losses, a single-phase two-level space vector pulse width modulation (SVPWM) strategy and a single-phase two-level carrier PWM strategy with zero-sequence voltage injection are presented in this paper. Their design methods are given...
In order to enhance the reservoir permeability and conductivity of oil reservoir and to improve the production of oil and gas by using the high-energy arc fracturing device, a high frequency high voltage sparker with a stored energy of 40kJ was developed. The sparker is mainly composed of a high voltage high frequency charging supply, energy storage capacitors, a discharging electrodes and a safety...
This paper proposes the optimization of interval type-2 fuzzy systems (IT2FSs) through continuous ant colony optimization (ACO) algorithm. The optimized IT2FS consists of Mamdani-type fuzzy rules, where the antecedent and consequent parts use interval type-2 Gaussian fuzzy sets with uncertain means. Given the structure of an IT2FS, this paper proposes the optimization of all the free parameters in...
Due to the dynamic nature of cloud computing it is very important for a small to medium scale service providers to optimally assign computing resources and apply accurate prediction methods that enable the best resource management. The choice of an ideal quality of service (QoS) prediction method is one of the key factors in business transactions that help a service provider manage the risk of SLA...
This paper presents a pump motor modeling and optimization method based on electromagnetic calculation and BP neural network. This method, according to the structure parameters of three-phase asynchronous motor in drainage pump, through the motor electromagnetic calculation, calculates the motor performance. It establishes a BP neural network model to fitting flow and water head for hydraulic performance...
An insulation condition assessment method of the transformer is proposed in this paper. The set pair analysis and the expert evaluation method based on the set-valued statistics are adopted to assess insulation condition of the quantitative index and the qualitative index respectively according to the insulation condition assessment model of the transformer which is built. The subjective weight of...
We propose a structural health monitoring framework that is based on the hybrid intelligent systems to compute composite structure health index as structure health indicator. With our proposed health structure monitor framework, it provides a decision-level analysis for structure health monitoring. In contrast, recent studies focus on signal processing, mechanical modelling and computer based systems,...
Today, applications of HiL (Hardware in the Loop) has been proven indispensable for its low cost and good real-time performance. However, video monitoring system also need be imported for monitoring work process to achieve the goal of supervising work state, especially in large railway maintenance machines. In this paper, we build a cost-effective and convenient platform TP-RT (Three-Party Real-Time)...
The study for the establishment of a complete flight information system that Provide airport management authorities as passengers aboard the aircraft before departure and after the arrival of the various kinds of information, In order to after the arrival of the aircraft to help passengers get instant information, Flight management system has been capture by the Aeronautical Information Services system...
The traditional identifier locator split network has many issues such as inflexibility, hard to innovate and difficult to deploy. SDN (Software Defined Network) provides a new direction for designing flexible identifier locator split network. The recent identifier locator split network based on SDN use the OpenFlow swicth directly via rewritting the address, which lacks the scalability and utilizes...
Software Defined Networking (SDN) and Internet of Things (IoT) integration has thrown many critical challenges. Specifically, in heterogeneous SDN-IoT ecosystem, optimized resources utilization and effective management at the control layer is very difficult. This mainly affects the application specific Quality of Service (QoS) and energy consumption of the IoT network. Motivated from this, we propose...
A new contextual e-healthcare model is proposed based on previously developed context aware conceptual framework and ICTization framework model. Conceptual framework consist connectivity, access, abstraction and service layers which standardize IoT infrastructure so that it can receive e-services based on context information leaving the current infrastructure unchanged and ICTization framework helps...
This research aims at the design of a circuit to provide power supply to every element in a sensor array in a scanning style for the data acquisition with very few wires. It is useful in data acquisition when there is a need of large amount of wires, but without enough space to hold these wires. It will make a sensing system practical by considerably reducing the number of the wires, especially for...
As the industrial electrical discharge machine (EDM) has the defects of high cost and large volume in preparing nanosilver colloid, this study designs a micro-electrical discharge machine (micro-EDM) for preparing nanosilver colloid. This micro-EDM comprises mechanical structure, a PC-Based real-time control system, and a servo circuit. As the electrode-holder of mechanical structure is made by 3D...
In the novel prototype of magnetic mass detection structure, the new configured capacitance sensing scheme for the mass detection is analyzed and the circuit detection scheme is implemented. The lock-in amplifier is employed in the capacitance detection to restrain the noise interference. The capacitance analysis using Pspice and Ansys APDL indicates the sensitivity of the detection along 5-DOF (degree...
Recently, increasing efforts have been focused on the development and adoption of autonomous underwater vehicles (AUVs) for various applications. However, the GPS signals are usually unavailable, the vehicle dynamics is very uncertain, and the complicated vision based localization algorithms may not work well in the underwater environments. Hence, accurate and timely state estimation using low-cost...
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