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Vellore, India

Vimalraj M.,TPEVRPC
International Journal of Applied Engineering Research | Year: 2015

When a short-circuit fault occurs in a distribution network, speed and reactive power consumption of an induction generator (IG) increase dramatically, which may cause system transient stability problems. This paper proposes an improved steady state equivalent circuit method to determine transient stability of a distribution system or a micro-grid with multiple IGs. Interaction between IGs and distribution network during a fault is investigated. The relationship between network parameters and speeds of IGs is derived using the steady-state equivalent circuits of IGs. The critical speed and critical fault clearing time (CCT) for maintaining system stability are determined using the proposed fuzzy based technique. The factors, which affect transient stability of a multi-IG distribution system, are investigated. The correctness of the proposed method is verified by dynamic simulation using MATLAB and Suppression of low-frequency oscillations increasing power transfer capability between interacting areas, Enhanced secure power flows reducing unplanned system separation or blackouts. © Research India Publications. Source


Vimalraj M.,TPEVRPC
International Journal of Applied Engineering Research | Year: 2015

Recently, the Particle Swarm Optimization (PSO) technique has been applied to solve power engineering optimization problems giving better results than classical methods. This paper shows the application of EPSO for optimal sizing and allocation of a Static Compensator (STATCOM) in a power system. This algorithm finds optimal settings for present infrastructure as well as optimal locations, sizes and control Settings for STATCOM units. Enhanced Particle Swarm Optimization (EPSO) method to solve the problem of optimal allocation and sizing of multiple type FACTS in a medium size power network (IEEE 30 bus system) in order to improve voltage profile, minimizing power system total losses and maximizing system loadability with respect to the size of FACTS. © Research India Publications. Source


Vimalraj M.,TPEVRPC
International Journal of Applied Engineering Research | Year: 2015

This paper proposes a novel method of wavelet lifting based three-phase grid impedance detection method based on dual-frequency harmonic current injection for islanding detection. Using wavelet transforms always results in time localization and hence the instant of islanding also can be detected with our proposed method. When the load mismatch occurs, it clearly reveals that there exists an impedance mismatch in power distribution systems. This is a serious problem in power delivery. Hence in this method based on dual-frequency harmonic current injection(DFHCI) is injecting two non-characteristic symmetric harmonic currents, and then according to the different harmonic voltages caused by different frequency harmonic currents, all three-phase impedances can be calculated accurately. The implementing algorithm of the presented method is derived and its performance is analyzed in detail. Simulation and experiments are carried out under grid impedance balanced and unbalanced conditions. Theoretical analysis and experiment results proved that the proposed method is practically feasible by MATLAB. © Research India Publications. Source

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