Fast-acting energy storage devices can effectively damp electromechanical oscillations in a power system because they provide capacity addition to the kinetic of generator rotor, which share sudden changes requirement. The effectiveness small-sized magnetic (MES) units (both superconducting and normal loss types) for this application is shown, means best utilizing small such improve load-frequency dynamics large areas are suggested. proposed method improving load frequency control systems...

It is shown that magnetic energy storage units can simultaneously operate as continuous VAr (volt-ampere reactive) controllers while performing the role of load-frequency stabilizers in electrical power systems. This achieved by operating converter buck-boost mode with a switched capacitor bank placed across its terminals. The P versus Q modulation ranges 12-pulse depend on source inductance, secondary voltage input transformers, and output current. Once transformer chosen, range depends...

In this paper, a new strategy for the control of terminal voltage and frequency stand-alone self-excited induction generator-(SEIG) based wind generator, working with variable speed load is proposed. With generalized impedance controller (GIC) (voltage source pulsewidth-modulated inverter dc-link battery), to maintain active reactive power balance at SEIG terminals has been introduced its frequency. proposed strategy, only feedback loop used both A mathematical model SEIG-GIC system under...

This paper develops a model for colloid filtration which accounts the possibility of aggregation colloidal particles in aqueous phase. Depth-wise variation liquid-phase concentration, C(x), is measured experimentally presence monovalent cations at different concentrations and divalent cations, confirm that log C(x) deviates significantly from linearity all above cases. It also observed systems showing significant removal, preaggregation colloids observed, confirms correlation between with...

In this paper, the performance of a novel two-loop control strategy for three-phase self-excited induction generator (SEIG), used in wind/microhydro/biogas-based isolated generation schemes, is presented. The implementation grid-interactive synchronization generalized impedance controller (GIC), an impedance-controlled operation pulse width modulation (PWM) voltage-source converter, with SEIG described. frequency tracked using digital phase-locked loop implemented on dSpace DSP platform....

This paper presents the operating principle and performance of a generalized impedance controller (GIC)-based novel speed adaptive stator current compensator for voltage frequency regulation self-excited induction generator (SEIG) in standalone system feeding three-phase four-wire (3P4W) loads. The GIC has three one-phase full-bridge source converters 3P4W configuration with battery bank at common dc bus. Before installing SEIG on site, its rotor versus characteristics is established by...

Abstract A boundary element formulation is presented in this work for transient heat conduction analysis of three‐dimensional (3D) fiber‐reinforced materials. The cylindrical‐shaped fibers a 3D matrix are idealized by system curvilinear line elements with prescribed diameter. variations the temperature and flux fields circumferential direction represented terms trigonometric shape function together linear or quadratic variation longitudinal direction. This approach significantly reduces...

In this paper, the analysis of a three-phase self excited induction generator (SEIG) with static VAr compensator (STATCOM) supported battery energy storage system has been presented. As compared to DC link capacitor provided STATCOM, improves stability and prevents power wastage. This investigation relates behavior SEIG in presence which is made operate at different modulation index 'm' relative phase angle '/spl delta/ between fundamental component STATCOM output voltages. gives new insight...

Abstract Membrane backwash is one of the most widely used membrane regeneration techniques in large-scale desalination operations and water wastewater treatment applications. It necessary order to enhance life critical managing cost pure water. The estimation optimal conditions very important for improved hollow fiber (HFM) operations. A unique feature HFM lumen side pressure drop, which leads variation flow across length. In this work, effect diameter, structural properties temperature on...

This paper discusses the dynamic interfacial tension (IFT) variation in a system containing an acidic oil contact with alkaline solution which may contain preformed surfactant. A modified technique similar, principle, to sessile drop is used for monitoring IFT ultralow range. The then applied measuring IFTs systems consisting of oils and solutions surfactants. effect aqueous phase pH, surfactant concentration, acid concentration on these determined by using this technique.

Present work shows the merits of space vector modulation direct torque control (SVPWM DTC) over conventional (conventional DTC). SVPWM DTC technique is helpful in solving basic issues ripple and variable switching frequency present DTC. Three PI controllers one each for speed, flux feedback loops used based IM drive. The major issue related with drive proper setting parameters loops. As they are inter-dependent nature, their parameter a tricky issue. No proven available to address this so it...

There has been a relatively long history of interest in comparing the various methods slope stability analyses geotechnical engineering. In past two years, mainly as result damages to Hurricane Protection System New Orleans, LA area and vicinity due Katrina, particular method analysis with others intensified. The Method Planes (MOP) was utilized designing hurricane protection measures Orleans vicinity. Due unsatisfactory performance some during questions were raised regarding accuracy...

Poor voltage and frequency regulation under source load perturbations limit the use of self excited induction generator (SEIG) in isolated dispersed generation, which can exploit wind/microhydro type renewable energy sources. In present work, a Generalized Impedance Controller (GIC), is pulse-width-modulated voltage-source-inverter with dc-link battery, used to regulate both, amplitude SEIG terminal using only PI controller feedback loop. The important aspect work show dependence sensitivity...