OKRP 2017 abstract

Topic: Braking system of a Grid Connected Wind turbine during Grid Failure

Abstract: This paper presents electrical as well as aerodynamic braking employed together in a Wind Turbine during grid failure to prevent from Runaway Turbine Disintegration (RTD). For electrical breaking, an ACVC Braking Resistor has been modeled which serves as a diverting path for the excess power generated by generating a specific firing angle. As for the aerodynamic braking, pitch controller has been used to generate required pitch angle to gradually stop wind turbine.

Keywords—Runaway Turbine Disintegration, Pitch Controller, Tip speed ratio, ACVC Braking Resistor, firing angle

Authors:Jeevan Sharma, Jyotsna Marasini, Richa Adhikari, Dr. Indraman Tamrakar

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Topic: Linear Actuator Based CNC Machine

Abstract: This paper presents design and fabrication of aComputer Numerical Control (CNC) machine which can manufacture a designed profile object according to instruction written a computer program. The profile designed is needed to write a CNC program based on labels. The label mode of program is selected because the programming is too easy even for complicated shapes. The conventional manufacturing process for producing a designed profile object has poor accuracy due to lack of skilled labours, lots of wastages and scraps due to unexpected mistakes and low-quality. The proposed CNC machine overcomes all these drawbacks. This paper describes the design procedure and CNC based programming to develop control logic to obtain desired controlled output. Simulation results as well as output from the fabricated hardware are presented in this paper.

Key words: CNC machine, programming to develop control logic, hardware implementation.

Authors: Alish Shrestha, Lalit Pun Nischal Aryal, Senesh Maharjan, Shivani Thakur, Prof. Dr. Indraman Tamrakar, Er. Mahendra Kumar Das, Er. Binod Bhandari.

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Topic: Modeling and Simulation of Solid State Transformer

Abstract: Conventional transformer are bulky in size and prone to losses. In this paper modeling simulation of Solid State transformer(SST) is presented which has small size, less power loss with compare to conventional transformer of same capacity. It is a high frequency transformer controlled by power electronic circuits. The power electronic circuit used in the scheme can be control to generate reactive power demanded by load internally so that separate Var compensator is not required. The power electronic circuit also can be control to give nearly zero voltage regulation.

Key words–High frequency transformer, Power electronic devices , reactive power compensation , Insensitive to harmonics.

Author:Srijana Shrestha, Menuka KC, Nishan Basnet, Adarsha Aryal, Dhiraj Paudel, Prof. Dr. Indraman Tamrakar,

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Topic: Hybrid AC/DC Microgrid and Its Coordination Control

Abstract: This paper presents a hybrid AC/DC microgrid which consists of an AC grid and a DC grid coupled through a four quadrant bidirectional converter which can act as an inverter or rectifier. Wind turbine generator (WTG), Micro hydropower (MHP) and Conventional AC loads are the main components in the AC grid whereas Photovoltaic arrays with boost converter, and DC loads are tied to the DC grid. Battery is connected to the DC bus to maintain the stable voltage operation. A prototype of the hybrid system has been established and simulated using Matlab/Simulink. The Coordination Control Algorithms are proposed for bidirectional converter to balance power flow between AC and DC grids and to maintain both DC and AC voltages. Uncertainty and intermittent characteristics of wind speed, solar irradiation level, and ambient temperature and load capacities are also considered in system control and operation. The simulation results show that system is stable under various load and supply conditions. Moreover, the hybrid grid has higher efficiency than individual DC or AC micro grid due to avoidance of multiple DC-AC-DC conversions.

Key words—Hybrid microgrid, grid operation, bidirectional converter

Authors: Niranjan Shrestha, Raju Tako, Sunil Karki, Saroj Kumar Sharma, Prof. Dr. Indraman Tamrakar

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Topic: Parallel Operation of MHP Plants with ACVCELC and Discrete-ELC

Abstract: Micro Hydro Power-plants (MHPs) are very popular power plants for electrification of rural areas where there is no approach of national grid. Most of these MHPs have either AC Voltage Controller based Electronic Load Controllers (ACVC-ELC) or Discrete resistance type Electronic Load Controller (D-ELC) for frequency control. Increased number of MHPs in rural area has made possibility of parallel operation of MHPs to form a micro-grid. If two MHPs, one with ACVC-LEC and other with D-ELC, are operated in parallel , it leads to unstable operation. This paper presents a new concept of central D-ELC to operate two MHPs in parallel to give stable operation. While two MHPs are operated in parallel, their local ELCs are deactivated and central D-ELC is activated for frequency control. While one of the MHP fails due to certain reason, the central D-ELC has to be deactivated and local ELC has to be activated.

Key word:  ACVC-ELC, D-ELC, MHP, synchronization block, bus coupler

Author: Er. Suraj Timilsina, Prof. Dr. Indraman Tamrakar

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Topic: A novel approach for wireless power transfer using magnetic resonant method

Abstract: A tool of efficiency and convenience, Wireless Power Transmission (WPT) has a great potential to improve the quality of life of people. A wireless power system basically consists of a transmitter and receiver devices in which the transmitter generates an oscillating, time-varying electromagnetic field. This paper presents a novel approach for WPT using class E inverter. The wireless power system setup with transmitter and receiver were simulated and a prototype was developed. The paper consists of the details and analysis of the prototype prepared.

Key word : Class E Resonant Inverter, Magnetic Resonant Coupling, Wireless Power Transmission

Author: Ashutosh Timilsina, Beni Nepali, Binay Paudyal, Jenesha Devendra Kunwar, Dr. Arbind Kumar Mishra, Dr. Indraman Tamrakar, Sharad Kumar Ghimire.

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Computer Engineering

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Topic: Artificial Intelligence, Big Data and Cloud Driven E-Governance (ABCDE)

Abstract: “Data is the new oil, AI is the new electricity.” The government of Nepal needs to adopt these technologies for a sustainable and proper e-governance. With the growing  movement pace towards Information and Communication Technologies (ICTs), each day a huge amount of data is collected and read write/read to the cloud. This paper focuses on how Artificial Intelligence(AI), big-data and cloud computing can affect the e-governance in Nepal. Our model illustrates the opportunities, challenges, and strategies for Big Data, Cloud Computing  and AI based services for e-governance  in Nepal. The model  deals with the cost minimization of the cloud setup for governments. Additionally the model provides some of the facilities through a service and can minimize time and  hassles Nepalese citizens face on going to different offices to complete a simple administrative task. Data that are critical for governmental process need not leave the on-premise and government owned cloud. On the other hand, non-critical data can be handled with the third party clouds, providing an easy access to the concerned entities. With services being provided through the cloud, one can access them via their laptops and mobile phones, reducing the load on administrative works as well as the service seeker.

Key word: E-governance, Big Data, Cloud Computing, Artificial Intelligence (AI), Critical Data, Non-critical Data

 

Author: Ashis Parajuli, Kshitiz Mandal, Nishan Pantha

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Topic:Factors Influencing The Adoption of Internet Banking in Kathmandu.

Abstract: Since the Information and Communication Technologies (ICT) can be leveraged for development, but harnessing this potential depends on an enabling environment for their production, diffusion, and use, and even the banking sectors in developing nation is not untouched with ICT. The study starts with the fact that it is necessary to reveal why the peoples are refusing to adopt new technology like internet banking knowing the fact that it reduces the mobilization of human and financial resources. Plus the fact is that internet banking lessens time, cost and effort of the banking customers. Since this research work aims to investigate the adoption and use of the internet for banking transactions, to quantify constructs concerning the current state of consumer beliefs and attitude towards internet banking, to propose opportunities in improving the use and acceptance of internet banking; this research tries to capture the realities collected about the banking service users’ perception toward internet banking.

Most of the banking service users have heard about internet banking and very few are unaware about it and they have heard about internet banking with four different options including; friends, banks, media and family. The number of internet banking users too is satisfactory since it is following the SMS banking. Using credit card is less popular banking activities in Kathmandu valley. There is balance assumption regarding trust towards the internet banking and its trustfulness among the banking service users. The banking service users have knowledge that role of internet banking site is to improve their banking activities. The majority of the banking service users have well awareness about the fact that internet banking enables them for quick banking service and activities. In the issue about respondents’ perception regarding the flexibility of internet banking to interact with, majority agree to the point. The cause or influential factor behind the adaptation of internet banking, majority of the service users regards media and friends. There is proper need that stakeholders should build the mutual understanding and trustful environment between banking sectors and banking service users in order to develop users’ belief and faith to the internet banking.

 

Author: Rajan Lama

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Topic: Open Government Data, Requirements and its Importance in Nepal.

 

Abstract: Open Data is becoming one of the most important potential resources that can be used to enhance the development of businesses, organizations, civilization, national policies by allowing governments, educationalists, researchers, developers, civics as well as common citizens to create an innovative strategies and plans, collect and reuse information that will eventually led to the development of nation. Open Data is digital information, or a data that anyone can access and share freely. This paper highlights Open Government Data (OGD) and its importance in developing country like Nepal.  Comparing to the other neighboring nations, Nepal faces lots of geographical challenges as well as natural disasters such as earthquakes and landslides, besides that; people lag appropriate medical treatments, proper access roads, road traffic problems, appropriate nation’s political stability issues and lacks proper infrastructures. Thus OGD can only be one of the most readily available resources, that once if utilized can give remarkable results. This paper reviews various requirements and principals of OGD and also highlights recent steps that have been taken by Nepalese civics and private sectors and the initiation state of government of Nepal in OGD.

Keywords—Open Data, Open Government Data, Big Data

 

Author: Anmol Ratna Bajracharya, Pratima Pradhan, Prof. Dr. Subarna Shakya

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Architecture and Civil

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Topic: Perspective in Using Building Information Modeling Technology in Nepal

Abstract: Building Information Modeling (BIM) is a model-based design technology, in which buildings will be built virtually before they get built out in the field. The design communication techniques are gradually changing from 2D based to integrated 3D based interface. This research is conducted to analyze the status of using this technology in Nepalese Architectural / Engineering consulting firm, which ultimately helps professionals to understand the perspective of this technology in Nepalese context. The study may create awareness among professionals about opportunities and challenges of the BIM technology. This research deals with the obstacles in use of BIM application in context of Nepalese consulting firm. It also determines the efficiency of BIM technology in comparison to contemporary Computer Aided Design method of design development stage work. The study explores the use of BIM in professional practice for efficient result and benefit. Focus is more on design development phase of project and the efficiency was analyzed through case analysis.

Keywords— Building Information Modeling, Status, Obstacles, Case Analysis.

Authors: Subash Phuyal

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Topic: Redevelopment of Dhaneshwor Nath Temple Complex Late Dharma Lal and Chandra Devi Bade Shrestha Foundation Student Design Competition 2017

 

Abstract: Student Design Competition 2017 on Redevelopment of DhaneshworNath Temple complex was held and was sponsored by Late Dharma Lal and Chandra Devi Bade Shrestha Foundation, USA; undertaken by Head of theFoundation Prof. Dr. Shiva Om Bade Shrestha with theOrganizing Committee from Department of Architecture. Various design solutions were prepared to attain a sustainable long term master plan and aesthetical built environment of temple with proper amenities. This paper presents the design concept and solutions prepared by the Winner team. The master plan for the site considered the existing access, connection of spaces, visual interest and user experience. The design had the clarity in terms of pedestrians and temple visitors with multifunctional spaces, plaza, wishing well, temple plaza, yagyashala, patis, water spouts, parking spaces, public toilets,attractive landscape gardens and leisure spaces. The Master plan programs were divided mainly in three categories; government, single andmulti donor; whereas project scale and construction time period were also considered.

 

Authors: Sweta Shrestha, Pradeep Maharjan, Rahul Bajracharya, Subash Phuyal, Sajan Raj Manandhar, Shrawan Thakuri

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Topic: Solid Waste Management Technique in Kathmandu

 

Abstract: Industrialization and Urbanization has led to numerous problems from over exploitation of natural resources to increment in the amount of waste production. The increase in the population and the change in the lifestyle of the people have led to high daily consumption pattern leading to even higher production of solid waste. Like the other developing countries, Nepal is not aloof of this problem. In accordance with the enactment of local self-governance act (1999), municipalities are the responsible Authorities for the management of solid wastes. Since then, they are taking care of the wastes generated by the respective municipalities with the available resources. Although small urban centres have been declared municipalities, they have been constantly suffering from the lack of infrastructural, financial and technical resources for the management of wastes.The main objective of this study is to make a survey of the conflicts of the solid waste management in Kathmandu and to identify different technique of waste management. The work was focused on solid waste management of Kathmandu.

 

Authors: Dibash Adhikari

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Topic: Flow Estimation Using TRMM V7 Satellite Rainfall Data and Grid Based Distributed Hydrological Model in Bagmati Basin.

 

Abstract—The prediction of runoff from a catchment is very crucial for every stage of water resources planning and management. Rainfall is one of the major factors that govern the runoff process and time distributed of magnitude. But in a country like Nepal, the data required at various stage of water resource management are either unavailable or insufficient. Dense setup of rain gauge network in a mountainous topography is difficult and expensive. In this challenging situation, an alternative is the use of satellite precipitation data with high spatial and temporal resolution. This study makes an attempt to predict steam flow using satellite based TRMM rainfall and downscale by comparing with the gauged based rainfall data from department of hydrology and meteorology (DHM). The milestone achievement of this study is establishment of general trend of TRMM rainfall data in context of Nepal, both spatially and temporally. In this study, Tropical Rainfall Measuring Mission (TRMM 3B42 V7) data were evaluated using ground based precipitation stations over Nepal and fed in a rainfall- runoff model to estimate daily discharge of Bagmati basin. YHyM/BTOPMC (block-wise use of top model with muskingum-cunge method) model was used for simulating the daily discharge. TRMM V7 rainfall seemed to be overestimating the rainfall compare to DHM data, which was addressed using bias correction. BTOPMC model would be useful in estimating runoff in un-gauged basins if calibration and validation is done for gauged basins.

Keywords—TRMM; DHM; Nash Sutcliffe Efficiency;

BTOPMC

 

Author: Saraswati Thapa , Narendra Man Shakya, Hiroshi Ishidaira , Jun Magome

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Electronics and Communication

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Topic: A Brief Research Overview on Emerging 5G

 

Abstract: Next generation network has some key targets that should be tended to be low latency, ultra reliable communications and massive data communication. To meet this requests exceptional enhancement should be made in cellular network architecture. Since it is expected that 5G cell innovation to be operational by 2020 so it is important to know the course of research advancements empowering 5G innovation. Advancement technologies such as massive Multiple input multiple output (MIMO), Millimeter wave (mm), non orthogonal multiple access (NOM) and cloud will have significant impact on design of 5G cellular architecture. Along with this, some of the emerging technologies that are addressed in this paper include device to device communication, dense heterogenous networks, cloud radio network, other modulation techniques and some brief research projects being conducted in different group and institutions. Over all this paper tries to give a complete overview of leader research drifts in the space of rising 5G advances.

 

Author: Sanjivan Satyal

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Title: Traffic Grooming comparison between ILP and Heuristic approach

Abstract: IP based traffic grows, as the bandwidth required also needs to increases simultaneously to accommodate the growing traffic . This growing demand for bandwidth can be achieved through the use of WDM. However, there still exists a huge gap between the increasing full-wavelength capacity and the existing low-rate IP traffic. Efficiently grooming low-rate traffic stream to high-capacitv lightpaths helps to alleviate the bandwidth mismatch, effectively improve the network resource utilization, and reduce the overall network cost. In this paper, we study traffic grooming problem in IP traffic over WDM framework. The problem of minimizing the total number of lightpaths is formulated as an integer linear programming (ILP) optimization problem. The ILP formulation produces optimal solutions for static traffic demands. However, applying the ILP solution to large and realistic networks is not practical due to its prohibitively large computation time. We therefore develop a heuristic algorithm, namely traffic aggregation algorithm.

 

Author: Suramya Sharma Dahal

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