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The main objective of this study is to identify/determine the techno-economic and environmental merits of the inclusion of wind power to diesel power system for electricity generation in Nigeria. The optimum size of the wind-diesel micro-grid was determined by making energy-balance calculations using the Hybrid Optimization Model for Electric Renewable (HOMER) software. Analysis was performed for...
As the new world order is running towards microgrid and renewable generation, effective planning of the same is the need of the hour. The major challenge in planning the integration of renewable generation is its derating nature. This paper proposes an optimal design approach for cost effective and reliable microgrid. The optimum combination of generation capacities of multiple energy carriers in...
Over the recent years, the large-scale development of offshore wind power in accordance with HVDC transmission has received extended attention. For the exploitation of such systems protection during onshore AC faults is of large importance. This paper examines an offshore transmission system consisting of two large wind parks, and two point-to-point HVDC links. A frequency droop control method applied...
Evaluating the risk of capacity deficit in large interconnected power systems is an important task in planning studies in order to supply the demand in the system at a certain risk level. It makes it possible to identify in which parts of the system reinforcements are needed in terms of generating capacity and/or interconnections. In modern power systems, with tie lines interconnecting countries and...
In this work, we provide a new short-term reliability index that accounts for practical grid properties. The proposed index addresses the system frequency reliability and controllability of the grid and its deviation over a short time period. In the formulation, demand, renewable source, battery and generators are incorporated in stochastic manner. Using the equilibrium of demand and supply, and the...
This paper proposes a closed transition transfer switch (CTTS) based on a photovoltaic inverter which is capable of transition between grid-connected and island modes. The proposed system consists of the CTTS, utility grid and photovoltaic inverter connected to each input, respectively, an active load with power factor correction, and a system controller. According to the grid condition, the system...
This paper presents a combined accident scenario for a CANDU 600 Pressurized Heavy Water Reactor (PHWR) consisting of a design basis accident (DBA) and a sudden generator disconnection from the power grid. The scenario is considered in the hypothesis of a major earthquake, beyond the design basis (BDBA), which leads to the co-occurrence of both events. The analyzed DBA is the main steam header break...
The purpose of this paper is to determine the characteristics of properly functioning capacity remuneration mechanism, analyze the inefficiency of most popular mechanisms, and propose the novel concept of effective and controllable subsidy. The proposed mechanism guarantees differentiated remuneration depending on the technologies' contribution to the power system. It rewards higher the technologies...
This paper presents a sequential Monte Carlo (MC) method for the evaluation of the distribution network reliability, by considering the formation of microgrids supplying different portions of the network. The MC technique considers interfering near-coincident faults, as well as a mix of load profiles (residential, industrial and commercial) and renewable generation patterns (wind, photovoltaic, geothermal...
The increased requirements regarding the quality of power supply as well as the development of the transmission and distribution power networks brings about the need to connect new consumers and generators to the already-built electric networks, and these can be situated far from the existing substations. This paper presents a cost-benefit analysis of three technical solutions including simplified...
This is a standard for developing data related to the seismic capabilities of relays. This standardcompliments ANSI/IEEE Std 344-1975, Recommended Practices for Seismic Qualification of Class IE Equipment for Nuclear Power Generating Stations, which provides general guidelines for developingdata related to seismic qualification of equipment used in nuclear generating plants.Data must be developed...
Periodical maintenance of equipments enhances their performance as well as lifetime. Generating units are prime components in the power systems and their preventive maintenance schedule helps to improve the overall performance of the system. The deterministic reliability model depicts the actual situation of the preventive maintenance planning and this process is primarily reliability centered. The...
Demand response (DR) is a key component of smart grids that can bring a lot of benefits to power system operators and customers. Most literature on DR focuses on the operation, control and planning aspects of “smart grids”, while its impact on, and potential for improving system reliability is less studied. DR can mitigate the operational limit violations by changing the load profile when the reliability...
A new planning tool for analyzing power systems in detail, including the long-run technical, economic and environmental consequences of policy or investment interventions, is now available for download by the public, without charge, at E4ST.com. The Engineering, Economic and Environmental Electricity Simulation Tool and its components are described here, and its accuracy is assessed through predictions...
In power system reliability evaluation, one of the basic data needed is the transition rates between various states of components such as generators, transmission lines and circuit breakers. These data are used to build the transition rate matrix for the components which can then be used to find state probabilities and interstate frequencies. There are some situations when a transition rate matrix...
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...
After several decades of experiences, Fast Bus Transfer Systems are generally considered to be reasonably standardized in terms of their design, features, specifications, application and system integration. However, at a deeper level, there continue to be a wide variety of choices that OEMs, consultants, contractors and end-users need to make that have a significant impact on the operation philosophy,...
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...
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...
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