International Journal of Energy Technology and Policy
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International Journal of Energy Technology and Policy (6 papers in press)
Predictive Direct Torque Control of a Rotor-Side Matrix Converter Driven Grid Connected DFIG with Torque and Flux Ripples Minimization Criterion by Midhun S. S., Samina T. Abstract: Doubly fed induction generator (DFIG) is the most commonly used machine for variable speed wind power generation, and single stage matrix converter (MC) can potentially replace the conventional back-to-back voltage source converters (VSC) for rotor to grid inter connection. In this research work, the performance of grid connected DFIG with rotor side MC is analysed with predictive-direct torque control (P-DTC) technique incorporating a criterion for minimizing the torque and rotor flux ripples at a fixed switching frequency. Space vector modulation (SVM) is utilized for MC side control. The system exhibits better transient and steady-state behaviour over conventional configurations, for both sub and super-synchronous operating modes, as evaluated by simulation based on a 2MW DFIG model in MATLAB-Simulink environment. Keywords: Doubly Fed Induction Generator (DFIG); Matrix Converter (MC); Predictive Direct Torque Control (P-DTC); Space Vector Modulation (SVM); Ripple reduction criterion.
CFD analysis of fluid flow and heat transfer in solar air heater having sinusoidal roughness by SUDHIR KUMAR, Suresh Kant Verma Abstract: CFD analysis of fluid flow and heat transfer in solar air heater (SAH) having sinusoidal (sine square function ) rib roughness provided underneath the absorber plate facing towards the fluid flow inside the SAH duct has been carried out in the range of parameters i.e roughness pitch (P) 10 mm-18 mm, roughness height (e) 0.7 mm-1.2 mm and Reynolds number (Re) 4000 15000 in order to find the optimal thermohydraulic performance (THP), a parameter indicating the maximum heat transfer at the cost of minimum pumping power required. The fine and uniform mesh has been used to resolve the viscous sublayer. Vortex (circulation) formed near the wall creates local turbulence and acts as a heat exchanger between the hot absorber surface and the main flow. The optimal value of THP (?) has been found to be 2.03 which has been compared with other roughness models (triangular and rectangular) and found to be the maximum among the three models. Keywords: Sinusoidal rib; CFD analysis; artificial roughness; thermohydraulic performance; solar air heater. DOI: 10.1504/IJETP.2022.10048677
Roadmap for the Transformation of Electrical Distribution Network of the City of Douala into Smart Grid by Camille Mbey, Alexandre Teplaira BOUM, Léandre NNEME NNEME Abstract: This article is a proposal for the development of a particular roadmap for the transformation of the electrical distribution network of the city of Douala into a smart distribution grid, based on examples experimented in other towns, surveys, interviews with resource people, academics and the master plan of energy development in Cameroon. It can be helpful as a guidance for the deployment of smart grids in Cameroon in particular and in African sub-regional towns in general. The experimentation results show that the smart grid deployment in the city of Doula will be done firstly in short-term for 1 to 5 years, secondly in medium term for 6 to 15 years and finally in long term for 16 to 30 years. The lack of related studies, benchmarking methods and the non-popularization and non-publication of results by those who have already worked on those problems, make this article a greater contribution for energy policy and development, mostly for sub-Saharan African towns. Keywords: Distribution network; Douala city; Roadmap; Smart grid; Transformation.
Power Quality Improvement in PV-Grid System Using Hybrid Lion-GH Algorithm Based Custom Power Device by Rayaguru N. K, S.P. Raja, Karunanithi K Abstract: Voltage distortions, flicker and unbalances are the major synchronisation problems in grid connected photovoltaic system lead to power quality issues. Also, sudden changes of load, application of nonlinear loads and switching conditions causes power quality issues. To overcome these problems, the proposed grid connected PV system is implemented with a custom power device (unified power quality conditioner). The photovoltaic system is designed and implemented by mathematical model approach, an maximum power point tracing-based (MPPT) dc-dc converter is used to extract maximum power from the solar system. The reference signal required for series and shunt converter of unified power quality conditioner (UPQC) is controlled with optimisation techniques. An MPPT-based boost converter is implemented with PV system to improve the efficiency in such a way that the duty cycle required for boost converter and parameters of PI controller are tuned effectively with a implementation of novel hybrid MPPT technique, i.e., hybrid connection of LOA-GH algorithm. This proposed system is to be implemented and tested in MATLAB/Simulink and results are to be verified with different controllers. Keywords: photovoltaic system; unified power quality conditioner; phase angle controller; lion optimisation algorithm; grasshopper algorithm; hybrid LOA-GO; P&O MPPT controller. DOI: 10.1504/IJETP.2022.10046547
Experimental Investigations of dual fueled two-cylinder diesel engine with Biodiesel and Natural Gas using a novel air-gas mixer by Brijesh Dager, Ajay Kumar, Ranbir Singh Abstract: Non-conventional energy resources (renewable fuels) have plentiful advantages over fossil fuels as they are biodegradable, renewable, help in energy security, and reduce environmental emissions. In this study, sustainable energy fuels like natural gas (NG) and bio - diesel were used. Natural gas is a very attractive and promising energy source to be used as fuel for IC engines because of its wide availability, inexpensive, clean-burning and extensive distribution infrastructure. The addition of biodiesel, particularly mustard oil methyl ester, can make it a more environmentally friendly and cost-effective choice for energy conversion by using internal combustion engines. This investigation is carried out to investigate the emission, combustion and performance behavior of a two-cylinder four-stroke CI engine in twin fuel mode. A homogeneous mixture of natural gas and air using a newly designed coaxial multi holes air gas mixer has been naturally inducted during intake stroke of the engine as the main fuel whereas diesel/MOME biodiesel is used as pilot fuel to initiate the combustion. This paper presenting a comparative study of performance, combustion and emission characteristics in diesel fuel mode alone (DLF), dual fuel mode using diesel as pilot fuel (DCNG) and dual fuel mode using bio-diesel as a pilot fuel (BCNG) mode of operation. The current experimental results show that brake thermal efficiency is 1.26% lower, brake specific energy consumption is 1.17% higher than diesel, and 0.97% higher than DCNG mode. Nitrogen oxides are reduced by 4.12% when using DCNG and by 63.07% when using DLF. The level of smoke opacity emission in BCNG is 76% lower than in DLF, but 6.67% higher than in DCNG modes of operation of the engine at full load. In comparison to other modes of operation, BCNG has a higher valve of exhaust gas temperature, CO, and UBHC emission levels. However, the cylinder peak pressure and ignition delay values are intermediate between the DLF and DCNG modes. Keywords: Natural gas; Combustion; Emission; Renewable fuel; Mustard Oil Methyl Ester; Air fuel mixture.
Energy Intensity, Tourism Development, and Environmental Degradation Nexus: Further Evidence from Small Island State in South Asia by Ihtisham Ul Haq, Shavkat Otamurodov, Ravindra Hewa Kuruppuge, Sisira Kumara Naradda Gamage, Hotniar Siringoringo Abstract: Tourism industry is considered as a vital factor of economic growth but its impact on environment also grabs the attention of researchers. The prime objective of the study is to find the effect of energy intensity and tourism on environmental degradation in Maldives. For this purpose, energy intensity along with tourism is modelled in the environmental Kuznets curve (EKC) hypothesis context. A long run relationship is established among variables through cointegration technique after it is found that all variables are integrated of order one. Results show that energy intensity is contributing to environmental degradation in not just long run but also in short run whereas tourism leads to environmental degradation in long run while it curbs environmental degradation in short run. This study confirms existence of EKC hypothesis in Maldives. Causality analysis reveals unidirectional causality from income into carbon emissions and tourism. Policies are recommended for sustainable tourism in Maldives. Keywords: energy intensity; tourism development; EKC hypothesis; environmental degradation. DOI: 10.1504/IJETP.2022.10047864