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.
This paper reports on a study focused on smart energy management using advanced metering infrastructure (AMI). The paper digs into AMI communication standards understood and proposed by power utilities and regulators. Furthermore, the paper discusses a study of different AMI communication networks architectures designed by various proprietors and compares these system architectures with requirements...
This paper addresses the problem of optimal placement of Phasor Measurement Units (PMUs) by comparing two different placement algorithms namely, Integer Linear Programming and Matrix Manipulation. The results are compared to check the suitability of these algorithms for networks of different sizes such as networks with higher number of buses such as utility networks and those with smaller number of...
Distributed generators (DGs) are employed in distribution networks in order to cater to the localised energy needs. In this process, they help to augment utility generation, reduce transmission and distribution losses as well as improve power quality and reliability. However, the impact of DG connection on the operation existing protective and auto-reclosing devices of the distribution network must...
There is a new focus on clean power generation from renewable sources both globally and in South Africa. Many possibilities are being assessed, and one option being power generation from marine currents. Marine currents are sustainable, stable source of energy that is ideal for base load power generation. New current flow velocity and direction data have made this resource assessment possible. This...
After enactment of Electricity Act 2003 in India, a comprehensive change is happening in Indian power sector, and power distribution utilities are going through a reformation process to cope up with the regulatory change for reduction in Aggregated Technical and Commercial Loss, improvement in Power Quality, Reliability of Power Supply, Improvement in Customer Satisfaction and rationalization of electricity...
Power and energy sector in South Africa is looking alternate ways for clean power production in order to cut down its carbon emissions caused by bulk production from coal fired power plants. Commercial farm-scale biogas plants have immense potential for energy production from livestock manure in South Africa, where various agricultural activities are practiced throughout the country. These biogas...
The paper reports on the technical, economic and environmental assessment of stand-alone and grid connected electricity generation from landfill gas in South Africa. Theoretical models are developed in Matlab to calculate the methane production potential of three Western Cape landfill sites in order to assess their suitability for landfill gas to energy (LFGTE) projects. Then Homer package is used...
This review outlines the benefits that Phasor Measurement Unit (PMU) integration has on the power network. It reviews past optimal placement techniques covering meta-heuristic and deterministic algorithms. Three best performing algorithms are chosen in terms of minimum required number of PMUs for full system observability. It concludes that Integer Linear Programming (ILP) is the most adaptable mathematical...
This paper analyses the role of nuclear power in the electricity supply in South Africa from both a technical and economic perspective. The technical perspective considers the impact of transmission lines connecting a newly built plant to the national grid. The economic perspective analyses the cost elements of a nuclear plant, which include the capital cost, fuel cost, operation and maintenance cost,...
Renewable Energy Systems (RESs) are becoming an increasingly favoured source of clean power. However due to the intermittent and unpredictable nature of renewable resources, energy storage needs to be used to ensure that the load is met by the supply at all times. There are many possible options for energy storage, of which the most popular and technologically mature option is batteries. Two main...
This paper reports on the feasibility study of possible deployment of array of Marine Current Turbines (MCT) in the Agulhas current stream off the eastern coast of South Africa. The emphasis is to carry out a resource assessment from available marine data to determine the optimum location for such technology, as well as to suggest the most suitable technology for such a project. In many coastal areas...
A major challenge for India's policy makers is to determine how best to provide the necessary energy for India's extraordinary economic growth. The traditional approach has been to rely on increasing the supply of conventional energy resources, particularly coal, which accounts for nearly 70% of India's current energy consumption. Yet energy is not an economic output that must be maximized at all...
As the movement towards Distributed Generation and environmental aware power generation increases, decentralized power generation in the form of renewable technologies and Combined Heat and Power (CHP) generation is increasing. The optimal way of integrating these systems with existing systems is a matter of much speculation and research. This paper serves to review the possibilities of integration...
As oil and coal reserves are being depleted whilst at the same time the energy demand is growing, it is important to consider alternative energy generating techniques. Similarly there is a move from centralized power generation to decentralized power generation. Specifically within rural communities where there is limited access to electricity, it is possible for decentralized renewable energy systems...
Among the renewable energy technologies being vigorously developed, Wind turbine technology has been undergoing a dramatic development and now is the world's fastest growing energy. The continuous increase in wind power penetration level is likely to influence the operation of existing utility networks, especially the power system stability. Because of clean and economical characteristics, Wind energy...
This paper is concerned with the application of feed forward artificial neural networks for the prediction of the critical clearing time of a fault in power systems. The training of ANNs is done using selected features as inputs and the critical clearing time (CCT) as desire target. A single contingency was applied and the target CCT was found using time domain simulations. Multi layer feed forward...
Offshore windfarms is an emerging technology in the wind energy conversion system. For onshore wind farms high voltage overhead lines are used for transmitting power from the wind farm to the grid. However this option is not possible in the case of an offshore windfarm as large part of the distance to connection point must be covered by submarine cables. The application of high voltage dc (HVDC) transmission...
In the current power and energy scenario, distributed generation (DG) has generated a lot of interest across the globe due to the growing concerns about gradual depletion of fossil fuels, steep load growth, environmental pollution and global warming caused by greenhouse gas emissions. Renewable DGs such as wind generators and solar photovoltaic are well-recognized now-a-days as sources of clean energy...
State estimation is important for the automatic management and control of complex distribution networks with significant distributed generation. State estimation has been used extensively on transmission systems where, generally, measurements of bus bar voltages and line power flows exist. However, distribution systems normally have only a limited number of measurements. In such systems, additional...
Distribution System monitoring become a very important function in today's deregulated power markets and thus, state estimators have become the essential tools of choice for the implementation of this function. Determination of the best possible combination of meters for monitoring a given Distribution System is referred to as the optimal meter placement. Whether a new state estimator is put into...
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.