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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...
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...
This paper deals with voltage collapse proximity and dynamic stability of a power system following the occurrence of a contingency. The dynamic and static characteristics of the power system are incorporated into a multi-objective model in order to preserve power system security from the voltage and transient stability viewpoint. The optimization problem has been solved by the ε-constraint method...
This study offers a fully automatic BBN-ANFIS-based model of online condition monitoring system for a resilient MEG using FPGA chips. A direct connection of a FPGA-ZedBoard with on-field sensors is proposed in this study. The design enables real-time concurrent measurements of MEG's fault diagnosis assessment by mean of a hybrid BBN and ANFIS based model. The BBN capable to form a consistent function...
Nowadays with enlargement of power grid and increasing renewable energy integration, uncertainties and randomness challenge traditional power system analysis methods. Scenarios are widely applied to deal with power system uncertainties. Especially power flow examination in transmission expansion planning needs typical scenarios to verify normal power flow, and provide useful information for auxiliary...
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,...
By intensifying renewable energy sources integration to the power grid and forming the microgrids (MGs) concept, many studies have been done to investigate MGs operation, control, protection, and etc. The performance of loads can play a major role in the MG behavior. Different load models can be implemented in MGs. The voltage and frequency (VF) dependent load is a substantial load model which few...
IoT smart energy management is to maximize energy efficiency through energy information collection, energy DR management and energy sharing/trading by developing IoT-based smart energy platform technology. IoT smart energy management services provide energy efficiency enhancement, energy sharing and trading services through interconnection and integration of energy supply-transfer-utilization energy...
This paper proposes a class of optimal and robust controller for the islanded AC microgrid (MG) system which is composed of wind turbine generator (WTG), photovoltaic generator (PV), fuel cell (FC), micro turbine (MT), battery energy storage (BES) and loads. The proposed controller has two main functions: rationally utilizing MT, FC and BES, and regulating the AC bus frequency deviation. For such...
Electricity system in Indonesia is still dominated by coal and this trend will remain to meet its electricity demand in the future. However, many of the power plants have been operating more than fifteen years. As means to cope with instability of power supply and reduce environmental issues, the Government of Indonesia is considering the upgrading and modernization of the existing coal power plants...
Recently, with China's economic development into a new normal state, slow growth of the power demand and rapid expansion of new energy sources puts coal-fired power at excess risk in the short term. For Anhui Province, a coal-based province, more attention should be paid to the development direction of future coal-fired power. Considering the prospect of coal-fired power development in China and the...
Consider a microgrid with a hybrid collection of distributed energy resources (DERs) that include fossil, renewables and energy storage battery systems. Given the dynamic variability of the DERs in terms of power production, this paper presents an optimization approach for the optimal power dispatch in such a hybrid microgrid by taking into account amplitude and rate constraints on each DER. The constrained...
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...
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...
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