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In Solar Photovoltaic (PV) generation, an increasingly important issue is the reliability of electronics such as inverters, and how efficiently (and reliably) they interact with the local grid. Total Harmonic Distortion (THD) is increasingly important, relating as it does to efficiency and localised heating. PV is intermittent, so to design controlled experiments to evaluate power quality inverter...
Power system restoration in smart distribution network with distributed computing resources are evaluated in this paper. The issues in distribution network restoration in a centralized environment are discussed and how the distributed computing can help elevate these condition are tested in this work. Network reconfiguration is attempted to reduce the duration of loss of load in a self healing environment...
These days' memory elements in digital systems have become more prone to soft errors or transient errors due to integration in circuits, smaller size of transistors and capacitors, combining with cosmic ray effects and many more reasons. Soft errors in memory elements have been a greater concern than soft errors in logic circuits since memories are used to hold the largest numbers and bits susceptible...
Optimal sizing design of a micro grid (MG) is an important task that must be precede the construction of any MG. There exists an effective coordination between its different resources. In this paper a methodology based on the PV power forecasting and the evolution of load curve is proposed for the optimization of an isolated MG. The proposed method focuses to determine the size of PV panels and batteries...
CRC (Cyclic Redundancy Check) is a simple and an elegant method for error detection. It finds application in most of the high-speed data communication protocol. In High Energy Physics experiment often CRC is used for control and data frame communication with detectors placed at radiation zone. Reliability of CRC error detection capability alters with generator polynomial chosen. The most popular choice...
The energy paradigms in many countries (e.g. Germany and Denmark) have experienced a significant change from fossil-based resources to clean renewables (e.g. wind turbines and photovoltaics) in the past few decades. The scenario of highly penetrated renewables is going to be further enhanced - Denmark expects to be 100 % fossil-free by 2050. Consequently, it is required that the production, distribution...
Stand-alone generators are mostly used to deliver power to consumers in isolated remote locations or rural communities, which usually increase the cost of energy generation. Solar photovoltaic (PV) systems are experiencing a world-wide rapid take-up due to their rapidly reducing cost and climate-friendly attributes. This study aims to develop a PV-Diesel hybrid power system for the remote township...
Power transmission systems are prone to several vulnerabilities which may result in deterioration of system stability and incapacities due to equipment contingencies. The causes leading to contingency and instability are ranging from natural disasters to malevolent acts as well as misoperations and equipment's hidden failures. In principle, most power systems are designed in an efficient manner in...
Increasing worldwide demand for energy has made wind energy a forerunner as a renewable energy resource. Due to this, and due to the intermittent nature of wind, Wind Turbines (WT) reliability should be considered. Improving the reliability of a WT translates into reduced operation and maintenance cost. This highlights the aim of this paper which is a technical review on WTs critical failures as well...
This paper reports on future electricity generation scenarios modelled using NEMO, a model that applies a genetic algorithm to optimise a mix of simulated generators to meet hourly demand profiles, to the required reliability standard, at lowest overall industry cost. The modelling examined the least and near least cost technology portfolios for a scenario that limited emissions to approximately one...
This paper presents a method for optimal location, sizing and types of Distributed Generator (DG) used in distribution systems by assessing the reliability and efficiency of system through the SAIDI and SAIFI for measuring. In this paper, DG systems are assumed to be connected to distribution systems at all buses of the IEEE 34 bus test systems. The system reliability is evaluated by using future...
This study assesses the potential impact of high renewable generation on the spot electricity prices, generator revenue and profits in an energy-only electricity market. In particular, it presents modelling outcomes for the Australian National Electricity Market (NEM) with a range of possible renewable penetrations in 2030. It is assumed that the current reliability standard is maintained and participants...
This paper presents a grid-connected Wind Energy Conversion System (WECS) using a permanent magnet synchronous generator (PMSG) operating with variable speed. A maximum power point tracking (MPPT) algorithm is used to determinate the power to be extracted from the generator for each rotational speed while wind power remains lower than the PSMG rated power. Otherwise, the MPPT algorithm is disabled...
Photovoltaic plants are complex systems operating in variable conditions. Their performances can be deteriorated by many factors such as shadows and mismatch phenomena. In this case, a suitable device able to control and condition the produced power is needed. A power optimizer could represent an adequate solution since it is capable of regulating the PV generator output impedance to reach the maximum...
Sensors and wearable systems are expanding to make the IoT era. Requirements of the devices to realize the expansion of the systems are low-power LSIs which can operate eternally with energy harvesting power sources. The LSI should operate fast enough to deal with the data, followed by sleep mode to save the energy. The data during sleep mode should be reliably stored for the next intermittent operation.
A new type of recursive soft sequential estimation (RSSE) algorithm is presented. The algorithm can be used for fast initial synchronization of pseudonoise (PN) signals based on m-sequences. The key feature of the algorithm is the grouping of binary symbols and the reception of the group as a whole symbol. Different numbers of binary symbols in the group lead to different estimation algorithms in...
Sustainability of microgrids depends on a successful business model, enabling technology, and regulation policies. Technical challenges are still significant, but they can be divided and solved in diverse levels with application of existing technology in several ways. However, the regulatory context is vital to incentive microgrids integration into the electricity market. This article aims to explore...
In this paper some issues related to the Brazilians' regulatory context for microgrids insertion were analyzed. Among various issues, those associated to the fixed minimum billable amount and to the conversion of energy credits generated from net metering in different tariffs were assessed. It is presented a suggested solution for the modification of credit conversion due to generation and consumption...
To deal with frequent planned and unplanned grid power outages, local energy systems are becoming popular idea. These systems are equipped with storage devices and different distributed generations (DGs) such as diesel generators. Efficient and reliable operation of local power systems is complex since power outages are stochastic events, and also local energy suppliers have different operation costs,...
In this paper a novel DC line-interactive uninterruptable power supply (UPS) with load leveling feature is proposed. The new UPS replaces the common AC three phase UPS and can be used for systems with pulse loads, and has superiority in performance and efficiency. The DC UPS utilizes Li-ion battery module in the DC link to perform the load leveling feature and UPS functionality. A Li-ion LFP based...
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