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Data-driven failure diagnosis in transmission protection system with multiple events and data anomalies

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Journal of Modern power Systems and Clean Energy 2019年第4期7卷 767-778页

作者： Amir GHoLAMI Anurag K.SRIVASTAVA Shikhar pandey Washington State University PullmanUSA

To guarantee a reliable power supply,the expected operation of all the components in the power system is *** protection system is primarily responsible of isolating the faulty section from the healthy part for the *** in protection devices can result in multiple conflicting alarms at the power grid operation center and complex event analysis to manually find the root cause of the observed system *** not handled in time,it may lead to the propagation of the faults/failures to the adjacent transmission lines and *** availability of the synchronized measurements from phasor measurement units(pMUs),real-time system monitoring and automated failure diagnosis are *** multiple adverse events and possible data anomalies,the complexity of the problem will be *** this paper,a pMUbased algorithm is presented and discussed to detect the root cause of the failure in transmission protection system based on the observed state,*** line tripping andbreaker *** failure diagnosis algorithm is further enhanced to come up with the fully functional version of the failure diagnosis tool,which is tailored for the cases in which the pMU anomalies are *** the developed algorithm,the validity of the pMU data is ***,such causes as communication errors or cyber-attacks might lead to the pMU data *** issue is welladdressed in this paper and some major types of anomaly detection methods suitable for pMU data are *** show that the ensemble approach has some distinct advantages in data anomaly detection compared to the previously used standalone ***,the enhanced failure diagnosis method is developed to clean the inaccurate data in case of the anomaly in measured voltage ***,both original and enhanced versions of the tool are tested on 96-bus test system using the real-time opAL-RT *** results show the accuracy of the enhanced tool and

关键词： Failure diagnosis Transmission protection system protection mis-operation phasor measurement unit(pMU) Data anomaly and cleaning Ensemble method

Influence of particle size and temperature on the dielectric properties of CoFe_2o_4 nanoparticles

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International Journal of Minerals,Metallurgy and Materials 2014年第4期21卷 408-414页

作者： Deepshikha Rathore Rajnish Kurchania R.K.pandey NIIT University Department of physics Maulana Azad National Institute of Technology (MANIT)

The objective of this study was to establish the dielectric properties of CoFe2o4 nanoparticles with particle sizes that varied from 28.6 to 5.8 nm. CoFe2o4 nanoparticles were synthesized using a chemical coprecipitation method. The particle sizes were calculated accord-ing to the Scherrer formula using X-ray diffraction （XRD） peaks, and the particle size distribution curves were constructed by using field-emission scanning electron microscopy （FESEM） images. The dielectric permittivity and loss tangents of the samples were determined in the frequency range of 1 kHz to 1 MHz and in the temperature range of 300 to 10 K. Both the dielectric permittivity and the loss tangent were found to decrease with increasing frequency and decreasing temperature. For the smallest CoFe2o4 nanoparticle size, the dielectric per-mittivity and loss tangent exhibited their highest and lowest values, respectively. This behavior is very useful for materials used in devices that operate in the microwave or radio frequency ranges.

关键词： cobalt ferrite nanoparticles coprecipitation dielectric properties permittivity loss tangent particle size temperature

Risk assessment of microgrid aggregators considering demand response and uncertain renewable energy sources

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Journal of Modern power Systems and Clean Energy 2019年第6期7卷 1619-1631页

作者： Tirthadip GHoSE Harsh Wardhan pandey Kumar Raja GADHAM Department of Electrical and Electronics Engineering Birla Institute of TechnologyMesraRanchiIndia

In power market environment,the growing importance of demand response(DR)and renewable energy source(RES)attracts more for-profit DR and RES aggregators to compete with each other to maximize their ***,the intermittent natures of these alternative sources along with the competition add to the probable financial risk of the *** objective of the paper is to highlight this financial risk of aggregators in such uncertain environment while estimating DR magnitude and power generated by *** work develops DR modeling incorporating the effect of estimating power at different confidence levels and uncertain participation of *** this paper,two well-known risk assessment techniques,value at risk and conditional value at risk,are applied to predict the power from RES and DR programs at a particular level of risk in different scenarios generated by Monte Carlo *** establish the linkage between financial risk taking ability of individuals,the aggregators are classified into risk neutral aggregator,risk averse aggregator and risk taking *** paper uses data from Indian Energy Exchange to produce realistic results and refers certain policies of Indian Energy Exchange to frame mathematical expressions for benefit function considering uncertainties for each type of three *** results show the importance of assessing the risks involved with two unpredictable variables and possible impacts on technical and financial attributes of the microgrid energy market.

关键词： Aggregator Demand response Financial risk Value at risk Conditional value at risk Benefit analysis

Digitally controlled oscillator design with a variable capacitance XoR gate

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Journal of Semiconductors 2011年第10期32卷 86-92页

作者： Manoj Kumar Sandeep K.Arya Sujata pandey Department of Electronics and Communication Engineering Guru Jambheshwar University of Science and TechnologyHisarIndia Amity University NoidaIndia

A digitally controlled oscillator（DCo） using a three-transistor XoR gate as the variable load has been presented.A delay cell using an inverter and a three-transistor XoR gate as the variable capacitance is also proposed. Three-,five- and seven-stage DCo circuits have been designed using the proposed delay *** output frequency is controlled digitally with bits applied to the delay *** three-bit DCo shows output frequency and power consumption variation in the range of 3.2486-4.0267 GHz and 0.6121-0.3901 mW,respectively,with a change in the control word *** five-bit DCo achieves frequency and power of 1.8553-2.3506 GHz and 1.0202-0.6501 mW,respectively,with a change in the control word ***,the seven-bit DCo shows a frequency and power consumption variation of 1.3239-1.6817 GHz and 1.4282-0.9102 mW,respectively, with a varying control word *** power consumption and output frequency of the proposed circuits have been compared with earlier reported circuits and the present approaches show significant improvements.

关键词： digital control oscillator delay cell power consumption variable capacitance voltage controlled oscillators XoR gate

Dynamics of a fluid-filled curvilinear pipeline

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Applied Mathematics and Mechanics(English Edition) 2018年第6期39卷 905-922页

作者： V.A.RUKAVISHNIKoV o.p.TKACHENKo Computing Center of Far-Eastern Branch Russian Academy of Sciences

A mathematical model is presented, and numerical experiments are performed to describe the mechanics of the slow movement of a pipeline. The problem reduction algorithm to one-dimensional formulation is offered. Results of numerical experiment for the model problem are adduced. The proposed mathematical model is found to adequately describe the dynamics of known phenomena of pipes. The cross-sections of the extended curvilinear thin-walled pipeline are numerically demonstrated to experience warping, which has experimental confirmation in the literature.

关键词： bent pipeline numerical experiment hydroelasticity shell theory

Application of light emitting diodes (LEDs) for food preservation, post-harvest losses and production of bioactive compounds: a review

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Food production, processing and Nutrition 2022年第1期4卷 85-94页

作者： Amrita poonia Surabhi pandey Vasundhara Department of Dairy Science and Food Technology Institute of Agricultural SciencesBanaras Hindu UniversityVaranasiUttar Pradesh221005India

Light-emitting diode (LED) technology is a new non-thermal food preservation method that works by converting light energy into heat. LED has potential to revolutionize crop production, protection and preservation. This technology is economical and environmentally friendly. LEDs have been shown to improve the nutritive quality and shelf life of foods, control the ripening of fruits, induce the synthesis of bioactive compounds and antioxidants and reduce the microbial contamination. This technology also has great scope in countries, where safety, hygiene, storage and distribution of foods are serious issues. While comparing this technology with other lighting technologies, LEDs can bring numerous advantages to food supply chain from farm to fork. In case of small growing amenities which exploit only LEDs, energy expenditure has been successfully reduced while producing nutritious food. LEDs can be used to give us better understanding and control over production and preservation of food with relation to spectral composition of light. LEDs also play significant role in food safety by inactivating the food borne pathogens. Therefore, LED lighting is a very effective and promising technology for extending shelf life of agricultural produce by increasing disease resistance and with increased nutritional values.

关键词： Light emitting diodes Food preservation Anti-microbial Bioactive compounds Non-thermal

Model development for analyzing 2DEG sheet charge density and threshold voltage considering interface DoS for AlInN/GaN MoSHEMT

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Journal of Semiconductors 2014年第10期35卷 26-29页

作者： Devashish pandey T.R.Lenka Department of Electronics and Communication Engineering National Institute of Technology Silchar

A model predicting the behavior of various parameters, such as 2DEG sheet charge density and thresh- old voltage, with the variation of barrier thickness and oxide thickness considering interface density of states is presented. The mathematical dependence of these parameters is derived in conjunction with the interface density of states. The dependence of sheet charge density with the barrier thickness and with the oxide thickness is plotted and an insight into the barrier scaling properties of AIInN based MoSHEMTs is presented. The threshold voltage is also plotted with respect to barrier thickness and oxide thickness, which reveals the possibility of the enhance- ment mode operation of the device at low values of the interface DoS. The results are in good agreement with the fabricated device available in the literature.

关键词： DoS AIlnN MoSHEMT 2DEG barrier scaling

Secure Model to Generate path Map for Vehicles in Unusual Road Incidents Using Association Rule Based Mining in VANET

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Journal of Electronic Science and Technology 2018年第2期16卷 153-162页

作者： Arun Malik Babita pandey Chia-Chun Wu Department of Industrial Engineering and Management National Quemoy UniversityQuemoy 89250

Logical behavioral arrangements are a class of conventional arrangements to illustrate the happening of incidents in an appropriate and structured approach in vehicular ad hoc network （VANET）. These incidents are characterized as a list of path segments that are passed through by the vehicles for the duration of their journeys from a pre-decided local source to a local destination in a structured manner. A set of proper description illustrating the paths traversed by the vehicles as logical behavioral arrangements is describedin this paper. The data gathering scheme based on secure authentication to gather the data from the vehicles is proposed in this paper. This proposed data gathering scheme based on secure authentication is compared with the existing data gathering schemes by using veins framework and the results of analysis reflect that the proposed scheme outperforms among others. The data collected from the vehicles by the proposed data gathering scheme is stored at distributed road side units （RSUs）. From these collected paths, the common and frequent paths opted by the vehicles in a certain region are determined by using frequent arrangement mining approach. An estimation model is used to decidethe next path and the whole path map opted by the vehicles in unusual situations like accident, jams, or a particular time of day. The proposed scheme will helpthe society in reducing the waiting time in vent of emergency or normal working days.

关键词： Confidence motion arrangements support vehicular ad hoc network(VANET) vehicle-toroad side unit(V2R) vehicle-to-vehicle(V2V)

peristaltic transport in an elastic tube under the influence of dilating forcing amplitudes

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International Journal of Biomathematics 2020年第4期13卷 167-179页

作者： Sanjay Kumar pandey Amirlal Singh Department of Mathematical Sciences Indian Institute of Technology(BHU)Varanasi-221005 India

We investigate flow through an elastic tube which is constrained to a prescribed external forcing consisting of a progressive travelling *** a flow dynamics is closely related to that in the oesophageal *** mechanics of the tube is characterized by a relationship between transmural pressure difference and radial variation of the *** radial variation,assumed to be small,is studied by perturbation *** demonstrate that the elasticity of the tube plays a significant role in the flow *** increment in the forcing amplitude of the inward radial force enhances pressure,time-averaged volume flow rate and hence axial and radial *** is revealed that the elastic nature of the oesophageal tube favors swallowing.

关键词： peristalsis oesophagus elastic tube dilating forcing amplitude