The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Distributed Generation (DG) in the form of Renewable Power Generation systems is currently preferred for clean power generation. However due to their intermittent and unpredictable nature, energy storage must be used to ensure that the load is met at all times. There are many possible options for energy storage and the most popular and technologically matured option, batteries, is the subject of this...
Voltage dip has been a serious problem in electricity networks. It accounts for the disruption of both the performance and operation of sensitive electrical and electronic equipments, which has reduced the efficiency and the productivity of power consumers across the globe. In order to secure quality power supply this problem needs attention for a sustainable solution. In the field of electrical power...
With fast expansion of capacity in electric power systems in recent years, there is a growing need to deliver power to customers at acceptable voltage and frequency limits. Under different contingencies the stability of the system need to be reassessed and controlled. This can better be done in real time. This paper presents a review on real and off-line stability assessment of power system using...
The fast development of grid-integrated wind power introduces new requirements for the operation and control of power networks. In order to maintain the reliability of a host power grid, it is preferred that the grid-connected wind turbine should restore its normal operation with minimized power losses in events of grid fault. This paper presents the results for the transient performance of a 2MW...
This paper presents an overview of the design and operation of tidal energy conversion systems. The authors discuss tidal energy as a form of renewable energy in comparison to wind energy, especially the close resemblance between the design and operation of the turbine principles used for the two types of renewable energy. The main purpose of this paper is to set a flag to the fact that tidal energy...
Energy management of CHP-based microgrid is largely dependent on optimal deployment of distributed energy resources (DERs), where optimal bus-locations, capacity-sizes, and types are three major points to be considered in a microgrid planning. Investment and O&M cost, including fuel cost, are solely dependent on types of DERs. Present paper searches a way-out of how a electrical tracking demand...
This paper presents the analysis of cost-effective dispatching of emergency reserves with a specific focus on supply and demand side options. On the demand side options the focus is the demand market participation product. On the supply side options the use of open cycle gas turbines is studied. In capacity constraint systems the supplying demand with the current generation mix needs to be met. With...
In this work, modeling, simulation and analysis of load following behaviour of microturbine (MT) as a Distributed Energy Resource (DER) have been performed. The system comprises a MT interconnected to the utility grid. The MT is capable of operating in both islanded and grid-connected modes. This work considers that the MT supplies power to variable general and critical loads. The model also used...
This paper discusses the general impact of grid integration of wind energy in the Namibian context. The paper focuses on the current electricity situation in Namibia, which presents a demanding task to energy and power engineers in the country to develop ways of rescuing the dire electricity need for Namibia's nation. The efforts made by the country's power utility, NamPower and the government in...
Accurate short term load forecasting (STLF) is a prerequisite for proper generation scheduling and reliable operation of power utilities. Conventional methods of STLF, suffer from the disadvantages such as lack of ability to accurately model the weather parameters affecting the load, lack of robustness for representing weekends and public holidays and of being computation intensive. Application of...
Historical assessment and predictive methods are normally used to evaluate the reliability of a distribution network. Most utilities focus more on historical assessment rather than predictive methods. Predictive methods are categorised into analytical and simulation methods. The difference between these methods is the way in which the system reliability indices are evaluated. In this paper, the authors...
Distributed energy resource (DER) units are connected to the trunk feeder of micro-grid by different types of switches. Isolator and circuit breaker are the two such options as switching devices. In this paper, authors investigate how these switches influence the customer interruption cost (CIC) of a 6-bus radial micro-grid. In this context, they assess the reliability of the system using indices...
Over last two decades the risk and reality of environmental degradation have become more apparent with increasing economic development and population growth. Solving the current environmental problems, while addressing issues related to electricity generation and solid wastes problems, requires long-term potential actions for sustainable development. In this regard, renewable energy resources are...
The paper investigates the impact of penetration of Distributed Generation (DG) on the reliability of a radial distribution network. The authors evaluate the reliability of a portion of RBTS (Roy Billinton Test System) network with and without DG connection at different load points. Reliability assessment is performed using the analytical and Monte Carlo simulation techniques and enhancement of reliability...
The growing need for competition in the utility and energy markets and South African government's policy on the inclusion of Distributed Generation otherwise known as Embedded generation (EG)s in the future generation mix in South Africa will potentially mean that the numbers of generators being connected within the utility distribution networks will increase significantly. In March, 2009, the National...
Distributed Generation (DG) in the form of Renewable Power Generation systems are currently preferred for clean power generation. However due to their intermittent and unpredictable nature, energy storage needs to be used to ensure that the load is met at all times. There are many possible options for energy storage and the most popular and technologically matured option, batteries, is the subject...
Airport landing lighting is used to guide aircraft to an airport for safe landing during day or night operations and in any type of weather. It is crucial therefore that the landing lighting performs according to the standards set out by the aviation industry. Researchers at Queen's University Belfast have developed a technique for assessing the performance of landing lighting luminaires whilst in...
Climate change and security of supply have made it imperative for Europe to look at renewable sources of energy. Among the available sources, wind has emerged as the preferred option and this is evident from the fact that in 2008, wind formed the highest proportion of total capacity addition in Europe. Improvement in turbine efficiency, which in turn reduced the per unit generation cost of wind turbine...
Functioning, control and safety requirements of nuclear reactors must be well understood and implemented to ensure safety amongst employees and prevent accidents in nuclear power plants. This paper deals with one aspect of pressurised water reactor core control, viz., determination of Boron concentration in the reactor in response to variations in power generation in order to prevent poisoning of...
Reliability is a measure of performance. This measure can be used to help systems meet performance criteria, to help quantify comparisons between various options, and to help make economic decisions. This paper presents a fuzzy knowledge based approach for reliability evaluation of a distribution network. This approach makes a direct assessment of the network configuration, distribution substation,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.