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In this paper an analytical model is presented to demonstrate the performance of a dual wound three phase surface permanent magnet synchronous machine. In addition to normal operating conditions, the model is extended to explain various fault scenarios of the machine. Self and mutual inductances of a dual wound machine with double layer winding are analytically calculated from winding function and...
The principal objective when monitoring compute and communications infrastructure is to minimize the Mean Time To Resolution of service-impacting incidents. Key to achieving that goal is determining which of the many alerts that are presented to an operator are likely to be the root cause of an incident. In turn this is critical in identifying which alerts should be investigated with the highest priority.
Opinion dynamics and its understanding in social networks is an emerging field of research in recent years. Existing work mainly considers direct exchanges of opinions among agents under certain conditions. This paper addresses a problem where the agents of a network make and exchange decisions repeatedly in a multi-hypothesis scenario and learn from the neighbors' decisions. Two models are proposed...
The “More Electrical Aircraft” concept involves a significant increase of power demand in modern aircrafts. In this context, a new high voltage DC distribution system has been proposed. This makes it necessary to develop a new generation of DC-DC converters to supply the 28VDC loads. These converters must comply with stringent requirements in terms of power density and electromagnetic compatibility...
Widely distributed single-phase power electronic rectifier loads are increasing source of harmonics in power distribution system. These harmonics have many well known adverse impacts on the power system. So it is necessary to improve the power quality of the rectifiers. This paper presents a novel single phase rectifier in which capacitors are used in parallel with diodes in one leg of the rectifier...
In recent years, a significant amount of research has been conducted to explore the benefits of network coding in different scenarios, from both theoretical and simulation perspectives. In this paper, we utilize queueing theory to propose an analytical framework for bidirectional unicast flows in multi-hop wireless mesh networks, and study throughput of inter-flow network coding. We analytically determine...
Power optimizers are dc-dc converters, featuring maximum power point (MPP) tracking operation, deployed on a per module basis in modern PV plants, adding value on flexibility, diagnostic capability and energy yield. This paper considers the non-inverting buck-boost converter used as a power optimizer, with emphasis on the control scheme applied to it. In the analysed configuration, the converter inductor...
This paper proposes and analyzes a novel multiagent opinion dynamics model in which agents have access to actions which are quantized version of the opinions of their neighbors. The model produces different behaviors observed in social networks such as disensus, clustering, oscillations, opinion propagation, even when the communication network is connected. The main results of the paper provides the...
We consider a distributed Software Defined Networking (SDN) architecture adopting a cluster of multiple controllers to improve network performance and reliability. Differently from previous work, we focus on the control traffic exchanged among the controllers, in addition to the Openflow control traffic exchanged between controllers and switches. We develop an analytical model to estimate the reaction...
Flowering is a key process that determines yield in fruit trees, and a negative relationship between crop load and floral induction has been observed in many species. In apple tree, hormonal signals coming from seeds, which are assumed to be transported within the tree, are suspected to inhibit floral induction. To analyze the intertwined effects of tree architecture, crop load and inhibitory signal...
This paper presents a performance comparison of dual airgap and single airgap spoke-type Vernier permanent magnet machines (VPMMs). The dual airgap VPMM adopts the topologies with dual stator windings (DSW) and single stator windings (SSW). The key point is to demonstrate that the dual airgap VPMM with SSW could maintain better torque performance as compared to the VPMM with DSW, but greatly release...
Location management, accomplished through the backbone network and wireless links, is an important issue in a personal communication system (PCS). In this paper, we present a unified model to assess three dynamic location update strategies, including the distance-based, movement-based and time-based schemes, based on a seven-state Markovian mobility model on a two-dimensional hexagonal cellular topology...
Topologies with strong invulnerability and high reliability has become an important issue in the development of Wireless Sensor Networks (WSNs). In this paper, WSNs is modeled as a weighted network which the load of nodes is considered as the weight of nodes. Thus, the problem of balancing the load turns into the problem of balancing the weight of the network. A load-aware and energy-aware local world...
Quantitative description and complexity understanding of software architecture are difficult questions of software development. Taking The complexity evolution of VTK software version as an example, this paper proposes a model for predicting the complexity of software evolution based on logistic equation and quantitative validation of Lehman's law. Its basic idea is that the software architecture...
The simulation of current source modular multilevel converter (CSMMC) based systems with large number of submodules require significant computational efforts. In this paper, a simplified model of CSMMC is developed to reduce the computational complexity while maintaining the accuracy of the traditional detailed model. The model is constituted using controlled current sources in each arm of the converter...
A methodology is defined to select the variables with the greatest impact on the response of the system to be used in the design of single-ended low speed interconnects. A point-to-point topology was studied in this work, consisting of a master and a slave buffer, package, and two transmission lines with a series resistor on the PCB. The considered response for the system was the flight time of digital...
A key principle for optimizing network performances is to understand the relationship between network topology, configuration parameters, and their influence on the behavior of network protocols. While an attractive approach to this problem is to use formal models of protocols in combination with mathematical optimization, such methods are often limited by either poor scalability or approximations...
Causal analysis is frequently applied to identify cause and effect relationships among process variables and thereby enables to obtain the propagation path of disturbances. This paper introduces a new approach to detect causality in complex systems based on the Transfer entropy (TE) method by incorporating the information on process topology using an explicit search algorithm. Initially, the TE is...
For isolated DC-DC power converters, the inter-winding parasitic capacitance of the transformer is usually one of the main paths for common-mode (CM) noise. In order to simplify the CM noise analysis, this paper proposes a two-capacitor transformer winding capacitance model. The model is derived based on general conditions so it can be applied to different isolated converter topologies. A measurement...
This paper proposes a Flyback-based Input-Series Output-Parallel (ISOP) Auxiliary Power Supply (APS), intended to feed the control system of the cells of a Solid-State Transformer (SST). The SST topology is based on a modular Multiport Multilevel Converter (MMC). Energization of the cells auxiliary circuitry is not trivial due to the high voltages involved (tens of kV for the electric power distribution...
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