The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents the dynamic and steady state performance of a stand alone self excited induction generator (SEIG) with digitally controlled electronic load controller feeding single phase and three phase loads. The values of the capacitances are chosen to ensure self-excitation of the machine and to minimize the unbalance between the stator voltages. The excitation capacitors, ELC and load combined...
This paper describes the possibilities of a liquid fuel battery system that can have an energy density/life more than or comparable to conventional battery for electronic communication application. Micro liquid fuel engine driven micro generator is described and discussed in the paper. An analysis on state-of-art technologies is provided and a way to improve energy and power density of the micro-generator...
This paper deals with the design, analysis and simulation of neural network based DSTATCOM controller. Conventional controllers being fixed structure provide optimum performance only over a limited range of operating conditions for which they are designed. Alternate controllers based on fuzzy logic and neural networks are more robust and can be designed to operate well under a wide range of operating...
Buck converter is highly nonlinear system because of its inherent switching. When a buck converter is cascaded with DC servomotor for controlling the speed, conventional design approach (like PID, deadbeat...) for speed control can not be applied. This paper proposes design of fuzzy PI like controller for speed control of small DC servo motor cascaded with buck converter. The proposed fuzzy logic...
This paper presents a new method for minimum loss reconfiguration for radial power distribution system, in which the choice of the switches to be opened / closed is based on the calculation of voltage at the buses, real and reactive power flowing through lines, real power losses and voltage deviation, using distribution load flow (DLF) program. In the process of load flow calculation, two developed...
This paper presents the simulation studies on a cascaded H-bridge converter based distribution static synchronous compensator (DSTATCOM) for improving the power quality of a distribution system. Voltage source converter based DSTATCOM has been established as the most preferred solution for management of reactive power in distribution utilities and for improving voltage regulation, power factor and...
This paper presents a new approach to detect and classify the non-stationary power quality disturbances using advanced digital signal processing approaches like wavelet transform (WT) and S-transform (ST) in noisy conditions. WT is a powerful tool to detect the power quality disturbances, but the application of WT is limited in noisy conditions due to its degradable performance. Hence in this paper...
An innovative, computationally efficient digital signal processing algorithm has been proposed to evaluate the fundamental frequency of a non-sinusoidal power system signal at every sample instant. This approach adopts backward difference approximation as second derivative FIR filter to estimate the instantaneous frequency. Besides this, an efficient square root algorithm, based on iterative Newton-Raphson...
This paper presents an analysis of three-phase self-excited induction generator (SEIG) with static compensator (STATCOM) as a voltage regulator. Current controlled voltage source inverter is used as STATCOM, which provides fast dynamic response to maintain constant voltage at SEIG terminals during severe load perturbation and acts as a source or sink of reactive power. The dynamic model of SEIG is...
This paper presents a scheme for step-by-step restoration of a power distribution network under cold load pickup condition. The proposed scheme uses the optimal load shedding for each step of the restoration process, and determines the optimal switching sequence for the restoration process. The optimization is performed to achieve multiple objectives of minimum load curtailment and minimum switching...
Distance relays are widely used as main and back-up protection for transmission lines. Their operation is based on impedance measurement at the relaying point, which can be affected by several factors, including pre-fault line loading and short circuit levels at the line ends. The problem of growing loads and limited paths for new transmission lines, has been somehow overcome by introduction of flexible...
The steady state performance of a stand-alone variable speed constant frequency generation system using slip ring induction motor and two back-to-back connected IGBT based PWM converters is investigated in this paper. A new algorithm is developed which builds the DC link voltage up from a low initial value to the desired level without undue stress either on the machine or on the power converters....
This paper discusses the use of trajectory sensitivity analysis (TSA) in distributed generation (DG) systems. It is shown that the method can be helpful in the determination of influence of parameters such as line reactance, clearing times, exciter gain and mechanical power input on the transient stability of the system. This may be used to find the critical parameter values and also to locate DGs...
This paper presents an analysis of rotor speed stability of a constant speed wind turbine generator with active stall control. To analyze the rotor speed stability, a 3-phase short circuit fault on a sample system with a constant speed WTG has been simulated using DIgSILENT software package. From the simulation results, it has been shown that the operating point of wind turbine generator has influence...
Hybrid energy systems are increasingly being applied in areas where grid extension is considered uneconomical. Their costs can be minimized through proper equipment sizing and load matching. This paper reports the results of optimization of hybrid energy system model for remote area in India. For this purpose, the Jaunpur block of Uttaranchal state of India has been selected as remote area. The model...
This paper presents a very fast and effective "lambda,-logic" based algorithm for economic dispatch (ED) problem when some of the on-line generating units have prohibited operating zones. The operating region of units having prohibited zones is broken into isolated feasible sub-regions, which results in multiple decision spaces for the economic dispatch problem. The optimal solution will...
This paper presents the comparison and analysis of cogging torque and core losses of permanent magnet hybrid (PMH) stepping motor made up of laminated steel core with claw pole (PM) motor made up of soft magnetic composite core. The material used as permanent magnet in both the machines is NdFeB. Basic analysis was done using equivalent magnetic circuit for both machines and refined analysis is carried...
Advances in power electronics technology have improved the performance and output waveforms of PWM voltage source inverters. Switching frequencies of 2 to 15 kHz with 0.1 mus rise times are common with the current IGBT technology while allowing for power levels over 200 kW. While the high switching speeds and zero switching loss schemes drastically improve the performance of the PWM inverters, the...
The object of this research is to prototype a precision system, which mainly consists of a piezoelectrically actuated cantilever beam structure as powered by an AC + DC hybrid driving circuit. Pulse width modulation (PWM) control algorithm as well as nonlinear tabulation are developed to capture characteristics of the specific hybrid driver and actuator, while dedicated driving techniques are elaborately...
This paper presents the results of a finite element (FE) analysis carried out to study the effects of variation of rotor pole arc and rotor pole shapes on the performances of a doubly salient permanent magnet (DSPM) motor; based on which a clear comparison can be done on two types of rotor pole geometries namely, the parallel and tapered. Two-dimensional (2-D) FE models of a 8/6 DSPM motor for parallel...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.