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Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
A type of 550kV epoxy resin-impregnated paper oil-SF6 bushing, which used in main transformers equipped in a pumped storage power station, has gone wrong repeatedly and its capacitance and dielectric loss increased significantly. In order to clarify the cause of the batch of oil-SF6 bushing failure, the bushing has been tested to check its insulation characteristics, and has been dissected to study...
Industrial ecology seeks options to lessen the environmental impact of industrial systems, through reducing natural resource use and waste generation, and by emulating the cycles that are utilized in ecosystems and nature. Design facets of energy selection and energy efficiency, which are key parts of Design for Environment and thus important considerations in industrial ecology, are described. The...
This paper proposes a new hybrid carrier-based PWM technique for parallel interleaved two-level (2L) three-phase voltage source inverters (VSIs) analyzed as a single 3L inverter for line current ripple reduction. The carriers are interleaved to reduce the load side harmonics. However, this allows circulating current to flow between the VSIs. Using the proposed PWM technique, the circulating current...
Numerical simulation of a complete gas turbine engine working with inlet cooling of water injection has been evaluated using computational fluid dynamic (CFD), the influence of water droplet and injection rate on the compressor operation, engine combustion and the turbine were studied. The results obtained in contrast with dry compression unveil that, with minimum amount of water droplet and high...
As the temperature of electronic devices increases, their failure rate increases. That's why electrical devices should be cooled. One of the promising cooling techniques is using Phase Change Materials (PCMs). PCMs are potential temperature regulators that store and release thermal energy during the process of melting and freezing respectively. PCM-based heat sinks can effectively store the heat dissipated...
For the allocation of unbalanced power when the loads change in the Multi-terminal HVDC transmission system, a DC voltage slope control strategy considering the Optimal Unbalanced Power Allocation (OUPA) is proposed. The control strategy using hierarchical control includes processing layer and implementation layer. In the processing layer, a mathematical model of unbalanced power allocation is established,...
Optimization of biodiesel production from non-edible Carica papaya seed oil was experimentally investigated in this study. Biodiesel production process parameters such as methanol: oil molar ratio, catalyst type and their concentrations, reaction temperature and reaction time were evaluated. It was found that the optimum process parameters for transesterification of the Carica papaya seed oil at an...
With increasing flexible AC transmission system (FACTS) devices in operation, like the most versatile unified power flow controller (UPFC), the AC/DC transmission flexibility and power system stability have been suffering unprecedented challenge. This paper introduces the user-defined modeling (UDM) method into the UPFC dynamic modeling process, to deal with the challenging requirements of power system...
Existing control strategies of modular multilevel converter (MMC) have many drawbacks, such as need of several parameter controllers, complex parameter tuning and huge computational burden. This paper proposes a novel control method based on the hybrid architecture of proportional integral (PI) control and model predictive control (MPC). The PI controller is used as external controllers to control...
The demand for higher output efficiencies, greater specific power output, increased reliability, and ever reduced emissions has been rising. Due to its availability one promising alternative is the use of ethanol in internal combustion engines. In this study, the effects of ethanol addition (5%, 15% and 25% by volume) to diesel fuel on the performance and exhaust emissions of a 6 cylinder four stroke...
The very short-term bus reactive load forecasting allows the electrical system operator to determine the optimal amount of energy to supply the demand with quality, safety and reliability. With this premise, this paper used a knowledge data discovery approach to handle the forecast, from raw data to results analysis, using the neural network for data mining. Two forecasting models were developed:...
In this paper, multi-target adaptive system control strategy of UPFC is proposed based on 500 kV UPFC in Suzhou southern grid. With the proposed strategy, transmission lines will operate at target power under normal condition, while power line overload occurs due to N-1 failure or changes of operating conditions, the strategy gives priority to ensure that the power line does not exceed its power limit...
A 3D finite element model of heat and fluid flow in welding pool considering free surface of the pool and traveling speed has been developed. To validate the model predictivity, numerical and experimental sensitivity analyses were conducted using a design of experiments approach. The method FEM is used to compute all the governing equations and the method' front tracking' has been used to solve capillarity...
We aim to solve the OPF problem by defining contingency scenarios involved in the optimization problem by means of a SDP relaxation. Contingency scenarios are performed for the IEEE 39-bus system. Contingency analyses are performed by generation and line losses. Contingency scenarios are considered to be possible events. These events may be single contingencies, such as a generation unit failures...
The main objective of this study was to develop a model for performance analysis of a spark ignition engine fueled with propane and octane. GT-Suite software was used to develop the model for a single cylinder 4-stroke gasoline engine having a bore of 85 mm and a stroke of 85 mm with a capacity of 0.48 litres. A one-dimensional gas dynamics was considered for heat transfer model development for different...
In competitive energy markets, the growing adoption of renewable energy sources such as wind energy and photovoltaics causes power grid fluctuations due to the intermittency and variability in their power output. To balance the demand and generation by renewable sources conventional thermal power plants must operate with greater flexibility in the way they increase or decrease output. Furthermore,...
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