Wyniki wyszukiwania dla: H J Vermeulen
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This paper presents the results of an optimisation analysis aimed at exploring the geographical allocation of solar PV generation capacity in the context of grid support considerations such as average daily yield and variability, with particular focus on the full year scenario compared to the high demand season. All problem cases were evaluated using a combination of genetic algorithm (GA) and pattern...
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The South African Renewable Energy Independent Procurement Program has given rise to the commissioning of a number of utility size solar photovoltaic plants in recent years. Limited research has been conducted locally into performance monitoring and benchmarking of these large-scale solar photovoltaic plants. This paper presents the results of an exploratory study to investigate the potential of Data...
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The electrical energy consumption associated with sanitary water heating makes up a large part of the total load associated with residential energy consumption, and therefore load models thereof could find use in various Energy Management (EM) applications. This paper presents the results of an investigation to model the electrical load associated with the combined sanitary hot water heating systems...
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This paper presents the results of an exploratory study aimed at investigating the impacts of optimisation of PV plant locations in South Africa in the context of the seasonal and diurnal cycles associated with the system load profiles and solar generation profiles. The distribution of a normalised per-unit generation capacity is optimised across a set of locations chosen to represent the diurnal...
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Electricity utilities are increasingly targeting the residential load sector with energy management interventions, either in response to generation and transmission capacity constraints or with the view to realize energy savings in support of energy sustainability and environmental considerations. This increases the importance of load modelling for the residential sector, particularly with reference...
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Over the past decade the wind energy sector has grown worldwide from an installed capacity of 31.1 GW in 2002 to 273 GW in 2012. South Africa is forecasted to be one of the largest future developing markets for wind generation, particularly due to the need to introduce clean renewable energy into the generation capacity that currently consists predominantly of fossil fuel plants. This paper presents...
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The importance of independent Measurement and Verification of Demand Side Management (DSM) interventions, including Energy Efficiency (EE) initiatives, are now widely acknowledged. This, largely due to the increasing focus on the sustainability of such projects and pressures to show credible returns on investment for the financial incentives funded from both public and private sources. M&V performance...
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The installed capacity of wind generation systems has increased dramatically in recent years, thereby increasing the need for efficient model implementations for operational applications such as simulating system behaviour and grid interactions, identifying and quantifying ageing effects and performing condition monitoring. While the model topologies for conventional systems are well established,...
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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...
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Corona is a partial electrical discharge and its inception depends on the gas density, which is affected by the ambient pressure and temperature. During times of power disruption, it may be necessary to overload certain feeders for a limited time, resulting in conductors running at temperatures above normal. The layer of air adjacent to the conductor is also heated. In this paper the effect of the...
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An experimental study was conducted, using a Rotating Wheel Tracking and Erosion Tester (RWT) with the aim to compare the aging performance of different insulators under AC and DC (both polarities) excitation. The procedures of the standard were adapted to perform AC and DC (both polarities) tests on 6 practical insulators from different manufacturers, representing different materials and specific...
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This paper presents a case study on the transient performance of a typical sub-transmission network in Namibia in relation to grid integration of wind energy. The authors focus on the relative impact of two wind generator technologies, viz. direct-driven synchronous generator (DDSG) and doubly-fed induction generator (DFIG). Important aspects investigated are the impacts of penetration levels (generation...
artykuł
IEEE Transactions on Dielectrics and Electrical Insulation > 2010 > 17 > 2 > 513 - 520
An experimental study was conducted, using the Inclined Plane Test method to determine the performance of typical power line insulator materials: RTV (Room Temperature Vulcanized) silicone rubber coated porcelain, HTV (High Temperature Vulcanized) silicone rubber and EPDM rubber. The constant voltage method was employed to evaluate the performance of the above samples when energized by ac and dc (both...
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Wiadomości Elektrotechniczne > 2009 > R. 77, nr 11 > 42-46
Przedstawiono pierwsze na świecie i w Polsce polowe stacje prób izolatorów, podano ich charakterystykę oraz wyniki przeprowadzonych badań.
