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We describe a dynamic graph generator with overlapping communities that is capable of simulating community scale events while at the same time maintaining crucial graph properties. Such a benchmark generator is useful to measure and compare the responsiveness and efficiency of dynamic community detection algorithms. Since the generator allows the user to tune multiple parameters, it can also be used...
Grid connection of distributed generation would have a certain impact on safe and stable operation of receiving-end network, so systematic analysis on it would be significant. The method for comprehensive assessment on effects caused by grid connection of distributed generation on power grid is presented. The assessment system is divided into steady-state operation assessment, reliability assessment,...
High reliability is extremely important for uninterruptable power supplies (UPS) such as those used in the modern data centers. It is necessary to comprehensively and precisely evaluate reliability of different UPS system's architectures before constructing the data center. In this paper, a novel reliability analysis and simulation tool for data center power distribution system is proposed. The basic...
Usage-based statistical testing employs knowledge about the actual or anticipated usage profile of the system under test for estimating system reliability. For many systems, usage-based statistical testing involves generating synthetic test data. Such data must possess the same statistical characteristics as the actual data that the system will process during operation. Synthetic test data must further...
Based on the deficiencies for risk indicators of fault probability and consequence's application in distribution systems, the strategy of risk assessment for system operation based on health and importance indices is proposed. The health index oriented to system running states and importance index geared to the user diversity are defined, by comprehensively thinking about the development situation...
Recent simulation results have shown that serial concatenation with outer codes such as cyclic redundancy check (CRC) or parity check (PC) codes can boost the error correcting performance of polar codes. A theoretical analysis for further explaining where the performance gain comes from is in order. In this paper, we try to provide such an analysis for concatenated polar codes from the distance spectrum...
Tidal energy is a clean and environment-friendly energy source. It has many advantages such as sustainability, low initial cost, abundant and highly predictable due to its regular pattern. The working principle of tidal energy conversion system (TECS) is to use the potential and kinetic energy of the ocean waves caused by the celestial gravitation to drive the turbine that is coupled with a generator...
This paper presents aspects of the technical evolution in micro-networks efficiency with respect to the power quality and system availability. Different potential approaches for market using are shown. The environmental and economic effects of the micro-networks depends of their implementing phases, like design, commissioning and testing. It can be a lot different than the normal main grid, depending...
As the demand for data increase and the need for higher density network load, greater resiliency and efficiency a need for a reliable power distribution and back up is required. Currently our −48VDC distribution has limitation in size (kW), length of cable run and large battery reserves. Higher Voltage DC offers a number of benefits for Telstra from reduced cable size, simplified distribution set...
Maximum-distance-separable (MDS) codes are a class of erasure codes that are widely adopted to enhance the reliability of distributed storage systems (DSS). In this paper, we develop a new approach to construction of simple (5, 3) MDS codes. With judiciously block-designed generator matrices, we show that the proposed MDS codes have a minimum stripe size α = 2 and can be constructed over a small (Galois)...
Micro-grid technology is well-suited to power supply of an island. As to micro-grid planning, a critical issue is how to optimize sizes of distributed generation so that reliability and efficiency of power supply can be assured. This paper calculates different costs of equipment, operation, maintenance and replacement for different distributed resource models. Annual meteorological conditions, load...
The rapid proliferation of devices of the Internet of Things requires a vast network of heterogeneous devices to maintain the ability to communicate rapidly and seamlessly. The transition to delay sensitive Tactile Internet applications would demand on a new information and communications infrastructure. In our previous work, we have proposed a fast Location basEd Source Switching (LESS) mechanism...
The paper deals with the analysis of electromagnetic phenomena in a two-winding permanent magnet synchronous generator (PMSG) driven by wind turbines. The machine's winding is designed to facilitate application of a low cost and reliable AC/DC power electronic converter. The finite element method has been employed to develop numerical models for the case study problem of the machines. Special attention...
Demand Side Management (DSM) has been become a popular option for improving electricity system operations and reliability. Moreover, Demand Response (DR) programs provide superior efficiency and flexibility to their users. This paper proposes a method to assess system reliability and evaluate the specific contributions made by spinning reserves (SR) and DR. The method structurally and spatially decomposes...
Opportunities to develop commercial microgrids are emerging, but investors need analytical tools to assess the economics of microgrid business cases. A large part of the business case for microgrids in the real world is reliability based; yet in academic literature most tools analyze economics based on energy sales to customers or the macro grid. This work offers a new model, based on Monte Carlo...
A reliability assessment and capacity credit evaluation are presented in this study. The Probabilistic Production Costing Method (PPC) is used to assess the impact of variable generation (VG) on the overall reliability using metrics such as (1) Loss of Load Probability (LOLP) and (2) Expected Unserved Energy (EUE) indices. We also define capacity credit of VG in probabilistic terms and provide a computational...
In terms of power supplies and power conversion, power electronics based converters have their own advantages. Proper condition monitoring for power electronic converter has become necessary which is now in incipient stage. This paper includes different kinds of failure modes associated with power electronics at the converter as well as device level and recent Condition Monitoring (CM) techniques...
In this paper a new model is proposed to schedule the capacity of both up and down spinning reserve (SR) considering transmission constraints. Up SR is seen as the most important resource to cope with many contingencies and it is well studied, while the down SR is ignored by many papers especially when network constraints are considered. Ignoring the down SR would cause sub-optimal or even unfeasible...
Reliability-Security Constrained Unit Commitment (RSCUC) with emphasis on Mixed Integer Nonlinear Programming (MINLP) and Benders Decomposition (BD) based on thermal generating units are presented in this paper. To solve unit commitment problem generalized BD along with reliability issues are considered. The approach presented in this work allows the decomposition of the whole program in quadratic...
Microgrids are characterized as weak systems with poor power quality due to significant variations in frequency and/or voltage that can occur during sudden changes in load demand. This problem is exacerbated in cases where one of the power sources is tied to the microgrid through a grid-interactive inverter which is designed to trip when deviations in frequency and voltage exceed well-defined thresholds...
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