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Supplying electrical energy to the load on demand, economically and with acceptable levels of reliability and service quality is the main task of a distribution system. Energy distribution reliability is important in the competition conditions in electricity markets because consumers directly supply energy. Therefore, it is not enough to estimate how reliable the distribution system is at present...
Some of the future wireless networks are related to the provision of higher data rates and lower energy consumption. In contrast to the clear increasing spectrum demand, bandwidth is a limited resource. Cooperative diversity allows to increase the spectral efficiency and the reliability of the communication. However, in scenarios with high node density and high mobile data traffic volume the collaboration...
Urban electrical distribution networks are mostly comprised of Medium Voltage (MV) ring distribution feeders to improve reliability. Transformers connected to MV feeders transfer power from MV network to Low Voltage (LV) distribution networks. In underground LV distribution networks, feeder pillars are used to branch out LV feeders emerging from distribution transformers. Currently, the existing distribution...
General reliability and availability analysis methods that can be applied to structures, systems, and components (SSCs) in nuclear power generating stations and other nuclear facilities are contained in this guide.
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,...
Monte-Carlo sampling method in reliability evaluation has defects of great sampling number and low efficiency. This paper proposed control variable method in power system integrated with wind power unit, considering its feather of small unit capacity and large unit number. The proposed method is carried out on the IEEE RTS79 test system, compares with the conventional Monte-Carlo method and the average...
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...
Series-stacked server power delivery architectures have been proposed recently that can achieve much higher energy efficiency than conventional power delivery architectures. When servers are connected in series, differential power processing (DPP) converters can be used to regulate the server voltages when the servers are consuming different amount of currents. Server-to-bus DPP architecture has unique...
The application of droop control as the sole mechanism for power management in microgrids is limited due to its difficulty in achieving operational economy and regulation of frequency. Consequentially, these needs are usually managed using higher level communication-based distributed or centralised control layers. To address these issues, this paper introduces an alternative approach for power management...
This paper presents a novel hierarchical control solution and real-time controller for distributed power plants aimed for achieving full control capabilities and increased benefits from direct market participation, grid interaction and plant automation. The hierarchical control structure is introduced in detail, as well as the main functionalities inherent to each control layer. In addition, this...
This paper proposes an adaptive power management strategy with reduced sensor requirement for grid connected hybrid microgrid system under faulty conditions which occur in grid tied converters. Generally parallel combination of grid tied converters (GTCs) are used as an interface between microgrid and grid, which are responsible for power transfer among renewable energy sources (RES), hybrid energy...
This paper presents the joint Arrhenius-Weibull model as a new transmission line failure model as a result of operating under higher loading temperature due to DTR system application. The proposed model takes into account the effects of the line natural ageing (end-of-life) and its operation at higher loading temperature. The proposed model is compared with the conventional line ageing model that...
Power system reliability must be considered in the site planning and operation of electric power system. Referring to “Rencana Usaha Penyediaan Tenaga Listrik PLN 2016-2025” document, the annual growth of Jawa Bali System is 8.4%. The growth of the load will increase the power flow in the 500 kV Jawa Bali System in which affects the index value of composite reliability. This study calculates reliability...
The paper presents a novel Telepower (−48V DC) reliability method, directly utilising site asset data in simulation software, to determine the effectiveness of battery replacement programs. Reliability is often estimated by a simple count of the number of outages per annum. This approach has many shortcomings because a count of outages can change dramatically even when the reliability of the physical...
Considering unreliable wireless backhaul connections across transmitters, we investigate the outage performance of a finite-sized selective relaying system with M transmitters and N relays under Nakagami-m fading channels. To send the source message to the destination, the transmitter-relay pair providing the highest end-to-end signal-to-noise ratio is selected for transmission. The backhaul reliability...
The ever-increasing complexity in power systems requires novel optimization and control tools. These tools must be validated prior to application to real power systems. Such validation requires access to a realistic, high fidelity power system network model. Fuel cost is an important element for such a model, but is often difficult to obtain due to confidentiality constraints. This paper advances...
Micro-grid systems are based on distributed energy resources (DERs) for example wind, solar etc., energy storage devices and scattered loads that can perform islanded as well as grid-connected operation. The concept of micro-grid has brought a paradigm shift from large scale centralized power generation to Distributed Generation (DG). It has reduced the dependence on main electricity grid and enables...
In this paper, we investigate the secrecy performance of a cognitive untrusted relay network with a direct link using selection combining (SC) scheme, where a secondary source communicates with a secondary destination through an untrusted relay. We first examine the connection outage probability (COP) and secrecy outage probability (SOP) to investigate the reliability and security performance of the...
Transmission expansion planning (TEP) is helping the system operator to decide the optimal solution for building new lines and in the same time to increase the reliability and safety of the existing power system. The proposed problem is a mixed-integer nonlinear programming problem (MINLP) and it is solved using stochastic programming. Stochastic programming is applied when uncertain environment occurs,...
The good operation of Java Bali System aims to achieve a reliable, efficient and economical Operating System. Reliability is generally examined in two criteria: availability of supply (adequacy) and securities (quality of voltage, frequency, and dynamic stability). Currently, there are many reliability parameter applied in Java Bali System such as bulk system, generation, and transmission. All these...
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