ABSTRACTS OF PAPERS 2015

Session I

1. Boost Converter Based Passive Power Filter

Deeksha Sharma,Deepa Subedi,
Duman Shrestha,Suresh Kumar Timalsina,
Dept. of Electrical Engineering,
Central Campus,Institute of Engineering

Prof. Dr. Indraman Tamrakar 
Associate Prof. Dr. Netra Prasad Gyawali,
Dept. of Electrical Engineering,
Central Campus, Institute of Engineering, TU
Lalitpur, Nepal 

Abstract-: Harmonics in power system has received increased attention in recent years with the widespread application of power electronics circuits. Intensive studies and research have been concentrated in the input side of the circuit to prevent the harmonics generated by the switching devices to travel back to the network to disturb the other connected loads.This paper presents a boost converter based passive power filter to prevent the input side current harmonics irrespective of the load current. It is based on the full wave bridge rectifier, capacitor filter across the load and boost converter based controller. Output voltage and input current is sensed and the waveform of current is improved keeping output voltage constant. Reference sinusoidal current is generated and output current from rectifier is reshaped to follow the reference current using hysteresis band current controller.

2. Simulation for parallel operation of inverters with frequency and voltage droop control

Kapil Duwadi,
Hemanta Bhandari,
Pratigya Shrestha,
Hari Surya Tiwari
Department of Electrical Engineering
Central Campus, Pulchowk, IOE, T.U
Prof. Dr. IndramanTamrakar
Associate Prof. Dr. NetraGyawali
Department of Electrical Engineering
Central Campus, IOE, T.U.
Pulchowk, Lalitpur

Abstract: Droop controllers have been used from a long time in conventional power systems for sharing the load among the generators of different capacities. Similar type of droop controllers have been proposed in this paper for inverters operating in parallel so that they can share power (both active and reactive) according to their capacities. A d-q model based controller is used to generate necessary control signals for three phase inverters. LCL filter is used to filter the inverter output so as to obtain nearly sinusoidal output voltage.

3. Three Phase Four Wire Shunt Active Power Filter Using Instantaneous P-Q Theory As Control Strategy

Tulsi Sapkota,Sangit Poudel
Sanij Gyawali, Rabin Subedi
Dept. of Electrical Engineering,
Central Campus, Pulchowk, IOE, TU 
Lalitpur, Nepal.

Prof. Dr. Indraman Tamrakar
Associate Prof. Dr. Netra Prasad Gyawali
Department of Electrical Engineering
Central Campus, IOE, T.U.

Abstract-This paper describes the development of Shunt Active Power Filter (SAPF) for the three phase four wire system with balanced and undistorted supply voltage. The filter is designed to improve Power quality problems in electrical system by allowing us to compensate harmonic currents, compensate reactive power and Zero sequence current. Here, instantaneous p-q theory is used to extract reference current. The power stage of SAPF consists of current controlled 3-leged power inverter with split phase capacitors in dc side. The SAPF works as inverter and Injects the harmonic current, reactive current and zero sequence current.

Index Terms—Shunt Active Power Filter (SAPF), p-q theory, Non-linear, Point of common coupling (PCC), Butter-worth filter

4. Design of Power System Stabilizer using Genetic Algorithm

Mukesh Gautam,
Institute of Engineering,
Central Campus Pulchowk,
Pulchowk, Lalitpur

Abstract—This paper mainly focuses on the use of Genetic Algorithm (GA) for solving power system stabilization problems. The small signal stability analysis of power system is investigated considering Power System Stabilizer (PSS) for modern power systems. Gain setting of PSS is optimized by minimizing an objective function using GA. The controller design has been tested in Single Machine Infinite Bus (SMIB) system. All simulations are carried out using MATLAB.

Index Terms—Power System Stabilizer, Genetic Algorithm, Single Machine Infinite Bus

Session II

5. Performance Analysis of MIMO-OFDM System over Rayleigh and Rician Fading Channel

Surendra Khatri and Badri Raj Lamichhane Lecturer,
Kathmandu Engineering College,
Kathmandu, Nepal

Abstract—Orthogonal frequency division multiplexing (OFDM) is increasingly adopted method for high data rate and reliability in wireless communications. Here the performance of OFDM communication system has been analyzed using BPSK and QPSK modulation techniques. The analysis of bit error rate (BER) in OFDM communication system employing BPSK and QPSK modulation techniques in the given value of SNR under Rayleigh and Rician fading channels has been performed. OFDM has been associated with number of antennas at the sender and receiver sides to enhance the diversity gain or the capacity on time-variant and frequency-selective channels thereby resulting in better performance in terms of bit error rate. MIMO-OFDM is considered a key technology in emerging high-data rate systems such as 4G, IEEE 802.16, and IEEE 802.11n. Space time Block encoding provide high data rate with improved performance in terms of less bit error rate. So, the performance of MIMO has been optimized in this case. Space time block code has been used and simulation result is obtained. Simulation results has compared 1x1, 2x1, and 2x2 antennas and analyzed in the terms of bit error rate for various value of signal to noise ratio using BPSK modulation in the Rayleigh fading channel and impact of antenna array length on the performance is done. It has been observed that the lowest BER has been achieved by using highest number of transceiver antennas due to spatial diversity.

Index Terms— BER, BPSK, OFDM, MIMO, Rayleigh Fading Channel, SNR, STBC

6. A Wideband Low Noise Amplifier Using Pseudomorphic High Electronic Mobility Transistor

Suman Sharma, 
Sanjeeb Prasad Panday

Abstract—Today, the advances in technology guide the progress in the wireless communication circuits and system area. Various new communication standards have been developed in accommodate a variety of application at different frequency bands, such as digital video broadcasting at 450-850 MHz, FM transceivers at 87-108 MHz, Satellite communication at 950-2150 MHz, global positioning system (GPS) at 1.2 GHz, and cellular radio at 850-1900 MHz. A wideband Low Noise Amplifier (LNA) is key block in the design of broadband receiver for multiband wireless communication standards.In this paper the designed LNA uses multiple feedbackpaths,which addd egrees of free domin the choiceoftheLNA trans-conductanceto reducethe noise figure(NF)and increase the amplification. Itcoversthefrequencyrange of1 GHz to 3 GHz. Measurements shows a maximum gain of18.622dBand minimum gain of 12.221 dB across entire frequency band. The minimum NF is 0.7 dB, while the average NF is 1 dB across the whole band. The LNA achieves a return loss greater than 6 dB across the entire band.

Index Terms—Gain, Low Noise Amplifier (LNA), Noise Figure (NF), and return loss.

Session III

7. Performance Analysis of Cooperative Diversity for Free Space Optical Communication

Binod Sapkota
Department of Electronics and Computer Engineering
Thapathali Campus

Rajesh Kumar Paudyal
Department of Electronics and Computer Engineering
Himalaya College of Engineering
Chyasal, Lalitpur

Abstract—Free Space Optical Communication (FSOC) hasvarious techniques to tackle fading effect but none of them are efficient enough to completely eliminate it. Most used technique is spatial diversity but the antennas require large aperture size and separation distance. The Co-operative Diversity Technique (CDT) in FSOC is an alternative technique for combating fading in such system. The fading considered is turbulence induced fading in non-coherent FSOC with Intensity Modulation and Direct Detection (IM/DD). For performance analysis single relay CDT is used in absence of background radiation by considering Rayleigh as well as Lognormal fading distribution. The relay uses decoding and forward strategies. Though the technique pays power penalty due to additional transmission to relay for the communication under this scheme due to non-broadcast nature of FSOC, the results show improvements in symbol error rate for cooperation over no-cooperation scheme ranging from sixteen to ninety nine percentage in Rayleigh fading while in the case of Lognormal fading the improved symbol error rate is found as about twenty to ninety nine percentage.

Keywords— Free Space Optical Communication,Co-operative Diversity Technique,Intensity Modulation, Direct Detection

8. Cooperative Spectrum Sensing In Cognitive Radios with Increased Energy Efficiency and Throughput Optimization

Madan Neupane and Gaurav Gautam,
Faculty, Kathmandu Engineering College

Abstract—Incognitive radio network, improvement in the spectrum efficiency is achieved by employing the cognitive radios that act as secondary users to opportunistically access the under-utilized frequency bands. Spectrum sensing, as a key technology in cognitive radio networks is used to detect the signals from licensed primary radios to avoid harmful interference. However, due to fading, individual cognitive radios may not be able to reliably detect the existence of a primary radio. To mitigate such effects, cooperative sensing is proposed while satisfying a constraint on the detection performance. This paper presents the mathematical derivation for the optimal number of cooperating cognitive radios under two scenarios: energy efficient and a throughput optimization setup. In the energy efficient setup, the number of cognitive radios is minimized for a k-out-of-N fusion rule with a constraint on the probability of detection and false alarm. Hard fusion scheme k-out-of-N is considered due to its improved energy and bandwidth efficiency. In the throughput optimization setup, the throughput of the network is maximized by deriving the optimal reporting time in a sensing time frame subject to a constraint on the probability of detection. Computer simulations show that OR rule outperforms the AND rule both in terms of energy efficiency and throughput optimization with a smaller number of users.

Index Terms—Cognitive radios, Cooperative Spectrum Sensing, Energy Efficiency, Hard Decision Fusion, Throughput Optimization.

Session IV

9. Performance Assessment of Various Back propagation Algorithms for Network Intrusion Detection

Sharad Chandra Joshi
Masters of Engineering in Computer Engineering
Nepal College of Information Technology
Balkumari, Lalitpur, Nepal, 2014

Abstract - Information is one of the most valuable possessions today. As the Internet expands both in number of hosts connected and number of services provided, security has become a key issue for the technology developers. This research is focused on the detection of attacks in a network by using Multilayer Perceptron (MLP) with Backpropagation. KDDCup99 dataset, an intrusion detection attacks database is used as an input dataset for network intrusion detection. In this research, a Multilayer Perceptron is trained with various types of Backpropagation algorithms, and the research evaluates the performance of the algorithms. Based on the evaluation results, the research purposes that Resilient Backpropagation algorithm is the most efficient model for network intrusion detection. 

Keywords – Backpropagation, Dataset, Intrusion detection, KDDCup99, Multilayer Perceptron.

10. e-Governance in Nepal: Current Status and Challenges in Implementation

Kaphale Bisho Raj,
Senior Lecturer, Project Co-ordinator
Department of Computer Engineering

Abstract— Although Nepal stands at the lower rung in the global scenario of ICT, there have been discernible developments in the ICT sector in the recent past. The academic institutions/universities producing ICT professionals/human resources have expanded. The communication technologies, both electronic and print media, have extended their access to general people. Uses of the Internet, emails and computers are gaining in popularity. Several e-Government applications are being introduced. Noteworthy among the country’s recent e-Government initiatives is Nepal’s e-Government Master Plan, completed in November 2006. Another milestone is the preparation of an ICT Development Project which has worked out detailed investment proposals for prioritized projects. Negotiations are underway between the Government of Nepal and the Asian Development Bank for its financing and implementation arrangements. The Government of Nepal is keen interested and committed to promote government for implementation of various G2G, G2C and G2B projects defined under respective priority areas. But the road to e-government is not easy and straight. There are no doubt ample opportunities for national development through e-Government promotion. There are also several hurdles, problems and challenges which must be overcome for successful accomplishments of Nepal’s e-Government vision. This paper endeavors to present a holistic vision on e-Government development of Nepal.

Index Terms— e-Government, Master Plan, ICT