Diagnosis of Air-Gap Eccentricity Fault for Inverter Driven Induction Motor Drives in the Transient Condition
Modelling and Simulation Study of a Helicopter with an External Slung Load System
Comparative Study of Single Phase Power Inverters Based on Efficiency and Harmonic Analysis
Trichotomous Exploratory Data Analysis [Tri–EDA]: A Post Hoc Visual Statistical Cumulative Data Analysis Instrument Designed to Present the Outcomes of Trichotomous Investigative Models
LabVIEW Based Design and Analysis of Fuzzy Logic, Sliding Mode and PID Controllers for Level Control in Split Range Plant
This paper deals with the stability analysis of three-phase Induction motor drive using three stability criteria, namely Root locus, Bode plot, and Nyquist plot. etc. of the control system. The dynamic model of three-phase induction motor drive is designed. This model has been derived using two-phase motor in direct and quadrature axes. This approach is desirable because of the conceptual simplicity obtained with a two sets of windings, one on the stator and other on the rotor. The required transformation in voltages, currents, or flux linkages are derived in a generalized way. The mathematical equations so obtained are non-linear in nature. The mathematical model used is linearized around an operating point using the perturbation technique. The transfer function of three-phase induction motor drive is determined at different rotor frequencies and hence rotor speeds. The effect on stability of the drive is assessed at different frequency conditions. The rotor frequency (f ) and hence corresponding speed (w =2πf ) at which the drive is unstable is reported. This analysis is r r r carried out using MatLab codes.
Generally, the rating of an electrical machine is determined by its thermal limits. Induction generator is majorly used in wind power plants, to determine the operating speed of the induction generator, which is based on the wind speed. Hence the frequency of the generated voltage and current is variable. This paper presents a nonlinear temperature controller to estimate the saturated/steady state stator winding temperature at different operating currents and frequencies. A digital temperature sensor is used to measure the saturated winding temperature of the transformer at different currents and frequencies. By using polynomial curve fitting technique a nonlinear controller is implemented based on the experimental results, which is further used to estimate the saturated winding temperature of induction generator at different loads and frequencies. This is justified, verified and validated by experimental results.
The objective of this work is tuning of Proportional-Integral-Derivative (PID) controller parameter for designing a Multimachine Power System Network. Proportional-Integral-Derivative (PID) is widely used now-a-days in power systems, not only to improve small signal stability, but also for enhancing system damping. Further the structure of PID controller is also relative with simplicity and work as a function approximator. Bacterial Foraging Optimization (BFO) algorithm is a popular evolutionary algorithm, which is generally used for tuning of PID controllers. This proposed approach is easy for implementation as well as has superior feature. The efficiency of power system is also improving by this approach and convergence characteristics are also stable. The system Scheduling BFO-PID controller is modeled in MATLAB.
A Photovoltaic PV module along with an interconnection which gives a proper voltage and current to charge rechargeable batteries is termed as PV Battery Charger. The interconnection system used is a DC-DC converter which provides suitable charging voltage and current to the battery. Maximum Power Point Tracking is very unique to the field of PV systems to extract maximum power during operation. There are many conventional methods available for Maximum power point tracking, but they fail under rapidly varying weather conditions. To overcome this problem, non linear controllers are utilized much in the field of photovoltaic system. In this paper, the Sliding Mode Controller is implemented as the MPPT algorithm to deliver maximum power even under rapidly varying environmental conditions, disturbances, and system uncertainties. The obtained results indicate that the Sliding Mode Controller provides robustness under varying weather conditions compared to the conventional MPPT algorithms.
Nowadays, permanent magnet machines are being popular in the industries due to its higher efficiency compared to conventional electric motors. This paper presents the modeling and simulation of three and five phase permanent magnet synchronous motor machine for healthy as well as open phase fault condition. In this paper, the crucial performance of the system has been analyzed before failure and after failure. The after effect of failures might result in costly damage and lead to another fault, if nothing is planned earlier for this fault protection. This undesirable situation ought to be averted, or at least there may be a fault tolerant function to deal with such failures. Therefore, a control scheme under an open or multiple phase fault has been discussed in this paper for multi-phase PMSM drive with sinusoidal back EMFs. In the three phase system, one phase has been kept open, whereas for five phase system, two phases kept open one by one for analysis purpose. The fault has been created only for some instant of time, after occurring fault, the PI controller compensated phase faults. Finally, it has been observed that the multi-phase machines have higher fault tolerant capability.
Large power systems usually comprise more than one area connected together. Load frequency control becomes an important issue, especially with increasing size and complexity of Interconnected Power System (IPS). This paper is a review paper which contains different control schemes and different optimization techniques applied on different controllers to get the desired response of the system frequency and the power in the tie lines connecting the areas. The comparison is done from the point of view of the maximum shooting, settling time, and the system damping. The system under study is a multi-area system (2 areas, 3 areas, etc.). Controller types and optimization techniques will be reviewed latter in each reference.