Assam Don Bosco University Journals
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Analysis of Self Excited Induction Generator for Standalone Micro-Hydro Scheme
Get PDFMost of population which they do not have electricity are living in remote rural areas or off grid, to provide electricity for remote areas is a challenging task which require a huge investment and infrastructure, it is therefore convenient to provide them with decentralized energy system like distributed generation or hybrid system etc. utilizing the available renewable energy. This paper presents study results about the dynamic analysis of self-excited induction generator for micro-hydro power plant in which generation is carried out by the use of self-excited induction generator (SEIG). It can be a very effective solution to the power shortage in the hilly regions of developing countries, like Nepal, Bhutan etc. It is more economical than other possible electric power sources, because it requires simple design and semi-skilled persons; local manufacturers can manufacture the components. SEIG is becoming more and more popular, mainly due to its low cost, simple construction, robustness of its rotor design and low maintenance requirements. When Induction motor is used as a generator, the major problem is its terminal voltage fluctuation at varying load and varying speeds. To predict the dynamic behavior of SEIG driven by a constant torque from micro-hydro turbine is carried out by using MATLAB/SIMULINK under different loading conditions. The model has been developed using “SimPowerSystem†library from MATLAB to perform the simulation
Design of Horizontal Axis Micro Wind Turbine for Low Wind Speed Areas
Get PDFMicro wind turbines play an important role in becoming the alternative technology in the generation of electricity because of the increase in fossil fuel prices and the increase in demand for renewable energy sources. Similarly, Wind energy is becoming one of the best renewable sources of energy for generation of electricity because of the fact that wind is a clean and unbounded source of renewable energy. This paper presents the ideas of designing a horizontal axis small-sized wind turbine or horizontal axis micro wind turbine for low wind speed areas to produce electricity. A small-sized wind turbine or micro wind turbine is a type of turbine that converts the kinetic energy of wind into electrical energy and it is used to generate power for small power needs. It can also be used in many applications like homes, villages, and so on, requiring a very low cost for installation and maintenance
Stability Improvement of Power System due to Wind Farm and Fault using FACTS Devices
Get PDFWind energy is gaining the most interest among a variety of renewable energy resources, but the disadvantage is that wind power generation is intermittent, depending on weather conditions. FACTS devices are used to increase the transient stability on the presence of faults and the integration of renewable sources, like wind energy. Due to continuously varying wind speed components and also due to fault the active and reactive power along with terminal voltage fluctuates continuously. STATCOM and UPFC are two important FACTS devices; provide the desired reactive-power generation and absorption, entirely using electronic processing of the voltage and current waveforms in a voltage source converter (VSC). By connecting STATCOM and UPFC into the lines, the active power, reactive power, and terminal voltage is maintained constant and it also helps to improve the transient stability of the system. STATCOM can control voltage magnitude and, to a small extent, the phase angle in a very short time and UPFC can control voltage magnitude as well as phase angle and therefore, can improve the system performance. In this paper, improvement of transient stability in wind farm under fault have been studied using STATCOM and UPFC in MATLAB SIMULINK software
Analysis of data from the survey with developers on Stack Overflow: A Case Study
Get PDFMany businesses are understanding the current evolution of Big Data Analytics around the world. Along this line, businesses are investing enormously in view not to lose competitive advantage. The work in this paper, analyses the data from the survey conducted with the numerous developers on Stack Overflow in order to gain insights on the directions of programming languages, databases, and the job seeking status of the developers. Results show that the trend is developers want to use more the programming languages and databases used on cloud platforms for Big Data Analytics. Additionally, a Distributed Random Forest model with 87.64% accuracy, for predicting the job seeking status of developers shows that the developers may not be looking to move to new job environments and would prefer staying in their current company or organisation. This would be an indication that developers are most probably looking forward to bring added value to their current companies/organisations as Big Data Analytics would start to be adopted
Role of Assam Human Rights Commission in Promotion and Protection of Human Rights – An Analytical Study
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A High Voltage Gain Boost Converter: Concept of DC Power Transfer Using Mutual Inductors
Get PDFA high voltage boost converter is being prototyped in an artificial software-based environment of MATLAB/ SIMULINK and identifies the practical conditions of the converter. A direct current (DC) input voltage is being boosted to a higher magnitude by multiplying a gain factor in a dynamic process of DC power transfer by cascading three mutual inductors in a single core. Input voltage is being switched by primary IGBT switches creating simultaneous charging and discharging of primary inductor, hence induces identical voltage in two secondary inductors. Inductors are charged and power is transferred to a parallel capacitor and finally to the resistive load in accurate control of duty cycles
OVERCURRENT RELAYS COORDINATION USING MATLAB MODEL
Get PDFSubstation protective relay coordination setting plays a vital role in the safe operation of power system. The objective of protective relay coordination in an interconnected power system is to achieve selectivity without sacrificing sensitivity and fast fault clearance time. Proper coordination of relays is essential to minimize unnecessary outages. In recent years, power demand has increase substantially while the expansion of the system has been severely limited due to abnormalities of Isolation of faulty areas by the protection system as a result of lack of effective coordination of the relay operation. This paper presents a study on protection coordination of over-current relays (OCRs) in a 132/33kV transmission substation by considering its different operating modes using a MATLAB model. Over-current (OC) relays are the major protection devices in a distribution system. The operating time of the OC relays are to be coordinated properly to avoid the mal-operation of the backup relays. The purpose is to find optimum values of Time Multiplier Setting (TMS) and Plug Setting (PS) which is used to find optimum coordination of Over-current Relays
