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In this paper we demonstrate the performance and reliability of 1200V SiC DMOSFETs manufactured in a high volume 150mm Si CMOS foundry. These DMOSFETs exhibit less than a 10% shift in threshold voltage and practically no change in breakdown characteristics after high temperature stress tests at 175°C. The performance of very large area 6.30 × 9.45mm2, 11mΩ SiC DMOSFETs prove that device scaling is...
In sub-Saharan Africa, the electrical infrastructure is growing at a rapid rate, mainly through the construction of new regional interconnectors and rural electrification. This growth is not sustainable without consideration of grid resilience. It is well known that the Mozambican network is in need of improved grid reliability. During periods of adverse weather and peak demand the grid does not cope...
This paper presents the results of a Failure mode and effects analysis (FMEA) conducted for wind turbine (WT) systems. The FMEA was performed on the functional modes of WT sub-systems in order to understand its performance of each sub-system, and to identify weaknesses in the respective sub-systems of WT considered. Sensitivity analysis had been done to investigate the cross-spreading of unreliability...
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...
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...
Generation disruption is associated with poor quality of power as it causes both frequency and voltage reductions and at its severity, hampers reliability of supply to the customers. Improving power quality and reliability (PQR) may become the key benefit of micro-grid if its generation adequacy is properly addressed at the planning stage. Again, higher reliability level requires system reinforcements,...
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 radial network with and without DG connection at different load points. Reliability evaluation is performed using the analytical and Monte Carlo Simulation (MCS) techniques and enhancement of reliability is compared with both...
In the present paper, authors presents a value-based comparative analysis between electrical thermal demand tracking modes of operations at the planning stage from owner's point of view. Worth of operational strategy is evaluated using maximization of net present value (NPV) of 6-bus meshed and 14-bus radial microgrids which are assessed from optimal deployment their DERs with respect to optimal locations,...
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) technology (e.g. microturbine, fuel cell) has greatly been advanced in recent years. These DERs are often used as the main components of a CHP-microgrid system and may be called as CHP-based DER. CHP-based DERs can provide power and heat with reliability and quality tailored to the requirements of end-users. As deregulation regime is penetrating more and more into...
Importance of coal management in power plant is very much significant and also one of the most critical areas in view of plant operation as well as cost involvement, so it forms an important part of the management process in a power plant. It deals with the management of commercial, operational and administrative functions pertaining to estimating coal requirements, selection of coal suppliers, coal...
Deregulation and restructuring of old centralized power system has brought a renaissance in the history of electric power system. It has unleashed an open competition among the utility service providers in the respective sector of electric power system, i.e. generation, transmission, and distribution. Also, it gives birth to the new concept of micro-grids, which is an epitome of larger grid, called...
This paper reports on the current UK scenario of islanded operation of active distribution networks with distributed generators (DGs). Different surveys indicate that the present scenario does not economically justify islanding operation of active distribution networks with DGs. With rising DG penetration, much benefit would be lost if the DGs are not allowed to island only due to conventional operational...
This paper presents the Z - source inverter for adjustable speed drive system. The Z - source inverter employs a unique impedance network couple with inverter main circuit. By controlling the shoot through duty cycle, the Z - source inverter system using MOSFETS provide ride - through capability during voltage sags, reduces line harmonics, improves power factor and high reliability, and extends output...
In this paper, the authors deal with the issue of power quality phenomena in the distribution system that affects the reliability of the power supply to sensitive loads. Traditional solutions to power quality problems have been discussed here and the use of a microgrid as a preferred solution is presented. When the conventional and non-conventional micro sources are combined with energy storage devices,...
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