This paper applies finite control set model predictive (FCS-MPC) for dynamic reactive power compensation using a hybrid active filter (HAPF). The FCS-MPC uses based on LCL-filter equations to predict the system behavior and optimize action. In fact, application of in grid-connected converters with LCL-Filter is quite recent. algorithm very promising technique electronics its use has not been reported literature yet. multivariable structure along an adaptive notch damp resonance. main purpose...

Smart impedance is a new way to look at hybrid active power filters. As originally proposed in the literature, filters were presented improve physical limitation of tuned passive A conditioner named smart eliminate need filter tuning procedure, whole process performed electronically. The topology able manipulate displacement factor and perform multiple frequency harmonic current mitigation same time. In weak systems, where source not negligible, like grids, guaranties voltage regulation...

In the present investigation, use of a bainitic steel for forged gears applications and suitability different plasma nitriding treatments is discussed. The were forged, machined, ground, polished, nitrided at 500 °C with three sets N2–H2 gas mixtures, containing 5, 24, 76 vol.% N2, to develop case approximately 300 μm depth. Gears characterized before after concerning phase composition, microstructure, microhardness, fracture toughness, residual stresses states. Pitting wear tests performed...

One of the main gear damage mechanisms is formation pitting and spalling on tooth flank. Several factors have significant influence formation, such as: contact stress level; profile type; relative speed; surface finish lubrication conditions. This work comprehends global observation all parameters was carried out to explain phenomena related this wear mechanism. The test equipment uses power recirculation principle commonly known as FZG rig. gears were made from AISI 8620 steel had two types...

This work presents a tribological evaluation of the influence graphite and bronze fillers in two commercial composites dry sliding pin-on-disc test at same contact severity (PVa parameter) four testing conditions (varying both normal force velocity). Both fillers, comparison to pure PTFE, significantly affected coefficient friction (COF) mass loss. The distance required reach steady-state for COF was statistically equal all three materials. experienced relevant velocity. filler acted as...

It is discussed the use of ADI (Austempered Ductile Iron) for gears. The gears were produced from continuous cast iron bars, heat treated grade 3 ASTM Standard A897M06 (UTS >1200 MPa), and compared to carburized steel AISI 8620 induction hardened 4140. Tests on made using equipment developed at UTFPR, measuring time pitting spalling surface results show very good potential gears, replacing steels. too that nodule size affects life independently mechanical properties matrix. with smallest...

Resin‐bonded molybdenum disulfide (MoS 2 ) is widely applied as a solid lubricant. However, multiple coatings are usually required to meet other requirements in mechanical systems. In this study, quenched and tempered AISI 4130 steel was used the substrate, being shot blasted. Furthermore, three layers were successively deposited: zinc phosphate layer, phenolic resin (basecoat), topcoat based on MoS . The thicknesses of different obtained by scanning electron microscope ball‐cratering...

For the first time, influence of gas mixture on damage resistance a plasma nitrided DIN 18MnCrSiMo6-4 bainitic steel was investigated. Samples were at 500 °C with three different N2-H2 mixtures, containing 5, 24, and 76 vol.% N2. characterized concerning resulting roughness, microstructure, compound layer's phase composition, residual stresses in diffusion zone, surface hardness. Tribological ball-on-flat tests carried out reciprocal mode using zirconia as ball material for friction...

This paper proposes a new algorithm for three-phase digital PLL based on modified synchronous reference frame (MSRF). MSRF-PLL is suitable DSP implementation applied to grid connected utility equipments. The guaranty fast transient response, robust operation under disturbance and noise tolerance. strategy does not use PI controller, what improves the response accuracy of synchronizing output signal. described in details practical results, all types severe disturbances, are presented discussed.

This paper presents a new strategy to improve the applicability of adaptive filters for harmonic detection in shunt active power (SAPF). The final objective is improving speed convergence filter and reduces steady-state error. Two cases are presented discussed, one with Finite Impulse Response (FIR) 32 coefficients another an notch filter. Least Mean Square (LMS) algorithm was used adjust both cases. Simulations using Matlab clarify algorithm. Also practical implementation performed DSP...

Hybrid active series power filters, as originally proposed in the literature, presents a way to improve physical limitation of tuned passive filters. However, these improvements are restricted single filter parameter, i.e., quality factor or factor. To overcome limitations, hybrid system composed by impedance, capacitor bank and appropriated control strategy, called smart is proposed. The completely eliminates necessity classical tuning procedure, which requires capacitor/inductor...

In this study, the sliding wear of a DIN 18MnCrSiMo6-4 continuous cooling bainitic steel plasma nitrided with nitrogen rich gas composition was investigated. To evaluate influence processing time and temperature on mechanical microstructural characteristics layer, samples were at 400, 450, 500 550 °C for 3, 6 9 h. The produced layers characterized concerning microstructure, phase composition, microhardness surface roughness. tested by ball-on-flat reciprocating dry friction coefficient...

Abstract Gear manufacturers must make decisions about the manufacturing materials and superficial treatments. The best performance as to a type of failure should be evaluated. However, it is time-demanding costly process. present work proposes methodology for comprehensive assessment (experimental computational) contact fatigue gears in FZG test rig. investigated were 18CrNiMo7-6 20MnCr5 alloy steels, widely used industrial automotive transmission systems, but with very different raw...

This paper shows the behavior of same structure an hybrid active series power filter (HASPF) tuned in three different frequencies. The developed strategy is based on Modified Synchronous Reference Frame Controller. initial passive was chosen to be for fifth harmonic. performance system compared with and without compensation. ability topology changing resonant frequency shown. first harmonic, further it electronically re-tuned third finally seventh Practical results exhibits these tuning...

Grey cast iron (GCI) and compacted graphite (CGI) are the most employed materials to manufacture cylinder liners. The use of diamond tools hone surfaces resulted in an increase so-called folded metal occurrence. This irregularity can reduce performance engines investigations understand it have been made. In this sense, current study aims correlate variation Different samples GCI CGI were extracted directly engine blocks, resulting four metallurgical conditions. Topographical analysis was...