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Pulsed power network is one of the alternatives of smart grid systems. This scheme is applicable especially to localized power grid where only distributed generations supply power to consumers. In this demonstration, a miniature model of the localized pulsed power network is constructed and performed with two distributed generations, four consumers, and eight power routers. This model is operated...
Physical unclonable functions (PUFs) have become commercially available for anti-counterfeiting and authentication applications. PUF circuits are built on ASICs but can be implemented on FPGAs. For many electronic products, FPGAs are used in order to shorten development periods and reduce costs. Therefore, implementing PUFs on FPGAs can improve security in nearly all electronic products. However,...
With the rapid advances in IoT technologies, the role of IoT gateways becomes even more important. Therefore, improving the reliability, availability and serviceability (RAS) of IoT gateways is crucial. Nowadays, Linux is widely adopted for core enterprise systems not only because it is a free operating system but also because it offers advantages in regards to operational stability. With many Linux...
Monoculture in a computer network is defined as executing the same protocols and software on all the networking devices. Multiple, correlated failures may be triggered in a monoculture network by attacks that exploit existing vulnerabilities in either protocols, software, or hardware. In this paper, optimal multiculture network design is used to improve the network reliability in the presence of correlated...
Nowadays, the population of installed transformer in PT PLN (Persero) Transmisi Jawa Bagian Barat is 305 units which consists of many variations of manufacturers and types. It consists of 21 manufacturers and 38 types along with different operational age from the young age transformers (under 20 years) until the old age transformers (more than 20 years). It means, TJBB needs different strategy for...
LLC resonant converter is most frequently effective DC/DC converter to improve the power density and efficiency of DC charging module in electric vehicle power supply. Soft-switching technique can be applied in the topology to reduce the switch losses. However, DC charging module brings about 27% of failures in Electric vehicles (EV) charge device. The aim of this paper is to evaluate the reliability...
The reliability aspect study of Modular Multilevel Converter (MMC) is of great interest in industry applications, such as offshore wind. Lifetime prediction of key components is an important tool to design MMC with fulfilled reliability specifications. While many efforts have been made to the lifetime prediction of IGBT modules in renewable energy applications by considering long-term varying operation...
The modular multi-level converter is an upcoming topology for drive application in the megawatt power range. This paper presents a comprehensive reliability survey for this kind of converter which can be used for its optimal designing. In this survey, converter total failure rate, is calculated for different number of output levels to find the optimal condition in which converter can provide the best...
Active Thermal Control (ATC) consists in driving power switches in a less efficient way when low load conditions are present. The resulting wasted power is used to self-heat the device, reducing amplitude and occurrence of thermal cycles and hence improving the reliability. This paper presents a novel way to control losses, and hence temperature, of both positive- and negative-current devices in half-bridge...
This paper proposes an Active Thermal Control (ATC) method for MOS-gated power switches aimed at reducing temperature swing amplitude during operation. It leverages on the fact that thermal cycle amplitude of many actuation system components (such as power devices) has a large impact on the system reliability and lifetime. These figures can then be improved, which eases the adoption of electrification...
Reliability of power electronics is a critical issue, as most of the electrical energy is processed by power electronics. Various stressors impact the safe operation of the systems, including harsh environments, temperature variations, humidity, vibration and radiation. Physics of failure analysis uses models that describe how failure mechanisms evolve over time and induce failures. Active methods...
Digital lifestyle with always-on connection to internet as well as the emergence of Internet of Things (IoT) throughout the world calls for reliable, concurrently maintainable data center and telecommunications systems. Thus, this need had pushed the limit of electrical and mechanical system, in particular power and cooling systems to provide reliable, economical and maintainable services. This requirements...
A modular UPS system is generally presented as having a much higher level of availability than a monolithic, double conversion, on-line UPS system. However, there are different types of modular UPS systems available on the market, with varying degrees of reliability and availability. To represent the strengths and weaknesses of each architecture and accurately compare them to one another, a detailed...
This paper proposes a non-symmetrical permanent-magnet linear motor traction system (PMLMTS), in which the primary permanent-magnet linear motor (PMLM) is employed. Four movers are mounted with same phase angles. There are nine legs, including eight independent legs and one common leg. All legs have same normal voltage but different normal currents. The normal current of the common leg is four times...
Fault tree analysis (FTA) is a prominent reliability analysis method widely used in safety-critical industries. Computing minimal cut sets (MCSs), i.e., finding all the smallest combination of basic events that result in the top level event, plays a fundamental role in FTA. Classical methods have been proposed based on manipulation of boolean expressions of fault trees and Binary Decision Diagrams...
Telecommunication networks are designed for high reliability but, given their complexity, when problems do occur they are difficult to detect and diagnose. Anomaly detection approaches typically provide cryptic results, resulting in extensive human effort for diagnosis. Using data from a 4G network, we focus on non-parametric change detection algorithms for anomaly detection and evaluate the performance...
MODBUS is still one of the most widespread application layer protocols used in industrial communication due to its simple request-response communication session and its readiness to be implemented on top of several lower level communication protocols and various physical media such as RS232/RS485 serial lines and Ethernet TCP/IP. Given the well-known inclination of Modbus to inter-networking, a solution...
Since radio links in wireless body area networks (WBANs) commonly experience highly time-varying attenuation due to topology instability, communication protocols with fixed transmission power cannot produce a very good performance in terms of energy consumption, interference range, and communication reliability. We explain that how channel behaviourcan be modelled using Markov Chain. Then, a power-adaptive...
Software-defined networking (SDN) is a key emerging technology that enables networks to be programmed and dynamically reconfigured through software-based network applications. This programability also significantly increases the exposure of these networks to software application faults, which can compromise or crash the underlying SDN network. It is thus imperative to detect subtle faulty or malicious...
Consider the problem of estimating the (un)reliability of an n-vertex graph when edges fail with probability p. We show that the Recursive Contraction Algorithms for minimum cuts, essentially unchanged and running in n2+o(1) time, yields an unbiased estimator of constant relative variance (and thus an FPRAS with the same time bound) whenever pc
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