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Online Learning Control for Harmonics Reduction Based on Current Controlled Voltage Source Power Inverters

IEEE/CAA Journal of Automatica Sinica 2017年第3期4卷 447-457页

作者： Naresh Malla Ujjwol Tamrakar dipesh shrestha Zhen Ni Reinaldo Tonkoski Electrical Engineering and Computer Science Department South Dakota State University IEEE

Nonlinear loads in the power distribution system cause non-sinusoidal currents and voltages with harmonic *** active filters(SAF) with current controlled voltage source inverters(CCVSI) are usually used to obtain balanced and sinusoidal source currents by injecting compensation ***,CCVSI with traditional controllers have a limited transient and steady state *** this paper,we propose an adaptive dynamic programming(ADP) controller with online learning capability to improve transient response and *** proposed controller works alongside existing proportional integral(PI) controllers to efficiently track the reference currents in the d-q *** can generate adaptive control actions to compensate the PI *** proposed system was simulated under different nonlinear(three-phase full wave rectifier) load *** performance of the proposed approach was compared with the traditional *** have also included the simulation results without connecting the traditional PI control based power inverter for reference *** online learning based ADP controller not only reduced average total harmonic distortion by 18.41%,but also outperformed traditional PI controllers during transients.

关键词： Adaptive dynamic programming(ADP) current controlled voltage source power inverter(CCVSI) online learning based controller neural networks shunt active filter(SAF) total harmonic distortion(THD)

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Expert perspective on technological choice for cooking energy transition in Nepal

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Clean Energy 2024年第4期8卷 40-48页

作者： dipesh KC Sunil Prasad Lohani Poushan shrestha Chunyu Xue Renewable and Sustainable Energy Laboratory(RSEL) Department of Mechanical EngineeringKathmandu UniversityKathmanduNepal Biomass Energy and Environmental Engineering Research Center Beijing University of Chemical TechnologyBeijingChina

Solid biomass dominates as the primary source of cooking energy,especially in rural households of *** use of solid biomass has a detrimental effect on health,exacerbates the burden of biomass collection,and hampers access to clean *** the factors influencing the choice of modern cooking fuels is crucial to improving energy security and resilience and easing the transition to clean *** study evaluates technological choices for the transition in cooking energy from the perspective of experts working in the government,non-government,and academia sectors.A structured questionnaire survey was prepared with five criteria and nine cooking technology ***-one experts responded to the survey,and their responses were analyzed using the analytical hierarchy *** study reveals that efficiency and capital cost are the primary criteria for selecting cooking tech*** most suitable clean cooking technology is an induction stove followed by a hot plate,while the least preferred technology is a Bayupankhi stove followed by two-pothole mud improved cooking *** ensure the robustness of the method,sensitivity analysis was performed on the two primary criteria efficiency and capital cost of the cooking *** analysis revealed robust and consistent rankings of *** study should help create a conducive environment for relevant stakeholders and policymakers to formulate and implement relevant policies and strategies to accelerate the cooking energy transition in Nepal.

关键词： cooking technologies cooking energy transition electric cooking residential sector analytical hierarchy process

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Advance Electronic Load Controller for Micro Hydro Power Plant

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Journal of Energy and Power Engineering 2014年第10期8卷 1802-1810页

作者： dipesh shrestha Ankit Babu Rajbanshi Kushal shrestha Indraman Tamrakar Department of Electrical Engineering Institute of Engineering Tribhuwan University Lalitpur 1915 Nepal

Most of the MHP （micro hydro power） plants use ELC （electronic load controller） for speed control. Various types of ELC have been developed so far. A dummy ballast load is connected across each phase of generator terminals and ELC controls the power consumed by the ballast load to result in constant speed operation. The ELC developed so far uses thyristor switches in each phase to control ballast load power. The ELC senses the system frequency and comparing it with reference frequency, it generates a common value of firing angle for all three thyristor pairs of each phase. The performance of such ELC is not perfect for unbalanced consumers load connected in each phase, which overloads the generator. This paper presents an advanced type of ELC which senses frequency as well as consumer＇s load current of each phase and fires the thyristor pairs with different value of firing angles for different phases. This solves the problem of overloading of the generator with unbalanced consumer＇s load. Simutink model is developed to perform transient analysis of the proposed scheme and the prototype of hardware is also fabricated. The simulation results and experimental results are presented.

关键词： MHP ELC current balancing thyristor.

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