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Industry Applications, IEEE Transactions on

Issue 3 • Date May-june 2009

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Displaying Results 1 - 25 of 41
  • Table of contents

    Page(s): C1 - 902
    Save to Project icon | Request Permissions | PDF file iconPDF (70 KB)  
    Freely Available from IEEE
  • IEEE Transactions on Industry Applications publication information

    Page(s): C2
    Save to Project icon | Request Permissions | PDF file iconPDF (39 KB)  
    Freely Available from IEEE
  • Line-Start Permanent-Magnet Machines Using a Canned Rotor

    Page(s): 903 - 910
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (596 KB) |  | HTML iconHTML  

    Various line-start permanent-magnet (PM) machines have been around for many years: these offer the advantages of line-starting as an induction machine and running synchronously as a PM machine, both from a fixed-frequency supply. The major disadvantage is the uncertainty of successful synchronization, particularly with loads combining high inertia with high load torque. Virtually all conventional line-start PM machines use a cage-type induction winding embedded into the rotor along with the magnets. This paper describes an unusual variant of this type: comprising a very simple rotor construction of surface-mounted rotor magnets contained within an annular conducting rotor can which acts as the induction winding but can also provide environmental containment if the application requires it. The purpose of this paper is to describe the canned motor concept in detail so that its potential for other motor/drive applications can be assessed. This paper also develops and describes an analytical dynamic electromechanical model using ldquolayer theory.rdquo Experimental results demonstrating successful operation of a 2.5-kW prototype machine are presented together with the simulated results using the dynamic model. The influence of certain key design features on the synchronization process is also included. View full abstract»

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  • Stator Interturn Fault Detection of Synchronous Machines Using Field Current and Rotor Search-Coil Voltage Signature Analysis

    Page(s): 911 - 920
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (861 KB) |  | HTML iconHTML  

    Our recent observations suggested that harmonics in the field current are very promising to detect stator interturn faults in synchronous machines. So far, an increase in some of the even harmonics in the field current has been reported to detect such faults. However, no explanation has been provided for the cause of these harmonics. Moreover, the even harmonics can significantly increase with supply unbalance as well as time harmonics, which can lead to a serious confusion. Hence, in this study, an in-depth investigation was conducted to determine the origin of various harmonic components in the field current and their feasibility to detect stator faults. It was found that, owing to structural asymmetries of the field winding, some of these components clearly increased with stator interturn fault. The findings are helpful to detect faults involving few turns without ambiguity, in spite of the presence of supply unbalance and time harmonics. Both simulation and experimental results are presented in this paper. The diagnosis results have also been verified using a rotor-mounted search coil, which can also be used to detect even a one-turn stator fault very effectively. View full abstract»

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  • Rotor Flux-Barrier Design for Torque Ripple Reduction in Synchronous Reluctance and PM-Assisted Synchronous Reluctance Motors

    Page(s): 921 - 928
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (768 KB) |  | HTML iconHTML  

    The torque produced by a synchronous reluctance machine (including the permanent-magnet-assisted machine) is studied analytically, with the aim of pointing out the effect of the position of the flux barriers on the torque ripple. It is verified that the position of the flux-barrier ends highly influences the torque waveform. With the aim of reducing torque harmonic contents, a new strategy is proposed based on the choice of couples of flux barriers of different shapes. The flux-barrier geometry is chosen so as to obtain a compensation between the torque harmonics produced by each couple. Experimental results on two prototypes confirm the analytical prediction. View full abstract»

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  • End Space Heat Transfer Coefficient Determination for Different Induction Motor Enclosure Types

    Page(s): 929 - 937
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (969 KB) |  | HTML iconHTML  

    In this paper, the determination of the end space induction motor heat transfer coefficients is presented, and the methodologies used are examined closely. Two ldquoad hocrdquo prototypes have been built and a test bench completed. This paper reports the setup of the test procedures and results obtained in detail. As the end windings are the hottest points of the motor, particular care has been devoted to the determination of the heat transfer coefficient concerning the end-winding structure. The results obtained are of fundamental importance for the determination of the thermal resistances between end windings and end caps. These can then be used in thermal networks usually adopted in thermal model analysis. View full abstract»

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  • Position Sensorless Control of Interior Permanent Magnet Synchronous Motors Using Unknown Input Observer for High-Speed Drives

    Page(s): 938 - 946
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1398 KB) |  | HTML iconHTML  

    This paper proposes a new position sensorless control for interior permanent-magnet synchronous motor (IPMSM) drives fed by overmodulation mode pulsewidth modulation (PWM) voltage source inverter. It is attractive to expand the speed range of the IPMSM for application to electric vehicles, electrical household appliances, and so on. An overmodulation mode PWM voltage-source inverter makes it possible to solve problems such as efficiency, wide speed range operation, and so on. Most position sensorless controls based on inverter output voltage knowledge, however, cannot directly be utilized because the voltage reference obtained by the controller is not equal to the inverter output voltage. This paper proposes unknown input observer to estimate rotor position without voltage knowledge, and investigates robustness to inductance variation. View full abstract»

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  • A Novel Dual-Stator Hybrid Excited Synchronous Wind Generator

    Page(s): 947 - 953
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (673 KB) |  | HTML iconHTML  

    This paper presents a novel dual-stator hybrid excited synchronous wind generator and describes its structural features and operation principle. The no-load magnetic fields with different field currents are computed by 3-D finite-element method. Static characteristics, including the flux-linkage and EMF waveforms of stator windings, and inductance waveforms of armature windings and field winding, are analyzed. The simulation results show that due to the dual-stator structure, the air-gap magnetic flux can be easily controlled, while the output voltage can be increased effectively. Tests are performed on the prototype machine to validate the predicted results, and an excellent agreement is obtained. View full abstract»

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  • A Magnetic-Geared Outer-Rotor Permanent-Magnet Brushless Machine for Wind Power Generation

    Page(s): 954 - 962
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (680 KB) |  | HTML iconHTML  

    This paper presents a new permanent-magnet (PM) brushless machine for wind power generation. This machine adopts an outer-rotor topology, aiming at capturing wind power directly. In order to achieve high power density, a high-speed PM brushless generator is artfully integrated with a coaxial magnetic gear. The design details, with emphasis on the special constraints of wind power generation, are elaborated. By using the time-stepping finite element method, the static characteristics as well as no-load and on-load operations are simulated. A prototype is also built for experimentation. Both simulation and experimental results are given to verify the validity of the proposed machine. Finally, a quantitative comparison is made to justify that the proposed machine is of smaller size, lighter weight, and lower cost than its counterparts. View full abstract»

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  • DC–AC Cascaded H-Bridge Multilevel Boost Inverter With No Inductors for Electric/Hybrid Electric Vehicle Applications

    Page(s): 963 - 970
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (949 KB) |  | HTML iconHTML  

    This paper presents a cascaded H-bridge multilevel boost inverter for electric vehicle (EV) and hybrid EV (HEV) applications implemented without the use of inductors. Currently available power inverter systems for HEVs use a dc-dc boost converter to boost the battery voltage for a traditional three-phase inverter. The present HEV traction drive inverters have low power density, are expensive, and have low efficiency because they need a bulky inductor. A cascaded H-bridge multilevel boost inverter design for EV and HEV applications implemented without the use of inductors is proposed in this paper. Traditionally, each H-bridge needs a dc power supply. The proposed design uses a standard three-leg inverter (one leg for each phase) and an H-bridge in series with each inverter leg which uses a capacitor as the dc power source. A fundamental switching scheme is used to do modulation control and to produce a five-level phase voltage. Experiments show that the proposed dc-ac cascaded H-bridge multilevel boost inverter can output a boosted ac voltage without the use of inductors. View full abstract»

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  • Performance Evaluation of Three-Level Z-Source Inverters Under Semiconductor-Failure Conditions

    Page(s): 971 - 981
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1860 KB) |  | HTML iconHTML  

    This paper evaluates and proposes various compensation methods for three-level Z-source inverters under semiconductor-failure conditions. Unlike the fault-tolerant techniques used in traditional three-level inverters, where either an extra phase-leg or collective switching states are used, the proposed methods for three-level Z-source inverters simply reconfigure their relevant gating signals so as to ride-through the failed semiconductor conditions smoothly without any significant decrease in their ac-output quality and amplitude. These features are partly attributed to the inherent boost characteristics of a Z-source inverter, in addition to its usual voltage-buck operation. By focusing on specific types of three-level Z-source inverters, it can also be shown that, for the dual Z-source inverters, a unique feature accompanying it is its extra ability to force common-mode voltage to zero even under semiconductor-failure conditions. For verifying these described performance features, PLECS simulation and experimental testing were performed with some results captured and shown in a later section for visual confirmation. View full abstract»

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  • A Scalar Resonant-Filter-Bank-Based Output-Voltage Control Method and a Scalar Minimum-Switching-Loss Discontinuous PWM Method for the Four-Leg-Inverter-Based Three-Phase Four-Wire Power Supply

    Page(s): 982 - 991
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (977 KB) |  | HTML iconHTML  

    An all-scalar-control and pulsewidth-modulation (PWM) approach for the four-leg-inverter (FLI)-based three-phase transformerless four-wire power supply (PS) is proposed. The output voltage of each phase is controlled independently, and its controller is formed by a stationary-frame resonant-filter bank accompanied with proportional-control and output-capacitor current-based active-damping loops. The simple and easy to implement scalar-control method exhibits superior overall steady-state and dynamic performance in the PS applications involving loads with high crest factor and/or significant load imbalance. Utilizing the inverter zero-state partitioning, a generalized form of scalar PWM for the FLI is developed. A novel minimum loss discontinuous PWM method, which provides minimum switching losses under all loading conditions (including load imbalance), is derived. This simple scalar method provides superior performance, and unlike the vector methods, it is easy to implement. The controller and modulator design and implementation details for the system are given. Linear and nonlinear loads for balanced and imbalanced load operating conditions are considered. The scalar-control and PWM methods are proven by means of theory, simulations, and thorough laboratory experiments of a 5-kVA PS. View full abstract»

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  • 36-Pulse Hybrid Ripple Injection for High-Performance Aerospace Rectifiers

    Page(s): 992 - 999
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (647 KB) |  | HTML iconHTML  

    This paper presents a three-phase voltage-source 36-pulse converter that draws almost sinusoidal currents. The converter results from the combination of a series-connected 12-pulse voltage-source rectifier with a passive voltage-injection circuit and a bidirectional switch, referred to as hybrid injection. The voltage-injection circuit uses a single-phase rectifier bridge and a single-phase transformer. Both the voltage-injection circuit and the bidirectional switch operate at six times the supply frequency and have a low rating. In this paper, the converter operation is explained and analyzed. Subsequently, the converter is evaluated experimentally using a 4-kW 400-Hz prototype, where the THDI of the line currents was measured to be below 1.2%. View full abstract»

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  • VSC-Based D-STATCOM With Selective Harmonic Elimination

    Page(s): 1000 - 1015
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2330 KB) |  | HTML iconHTML  

    This paper describes the design, implementation, and performance of a medium-size distribution-type static synchronous compensator (D-STATCOM) with the simplest two-level three-leg voltage-source converter (VSC) topology. Reactive-power control is achieved by phase-shift-angle control, and VSC harmonics are eliminated by selective harmonic elimination method (SHEM). VSC has been designed at the highest low-voltage level of 1 kV and connected to a medium-voltage (MV) bus through a low-pass input filter and Delta/Y-connected MV/1-kV coupling transformer. At the MV side of D-STATCOM, line-current harmonics are minimized to comply with the IEEE Std. 519-1992 for the weakest supply conditions by applying 8-angle TLN2 elimination technique. This necessitates switching the water-cooled high-voltage insulated-gate bipolar transistor (HV-IGBT) modules at 850 Hz, thus eliminating 5th, 7th, 11th, 13th, 17th, 19th, 23rd, and 25th voltage harmonics at the input of VSC. By carefully designing the laminated bus system and selecting minimum stray-inductance dc-link capacitors directly mountable on the laminated bus, stray inductance of the commutation path is brought to a nearly absolute minimum of 60 nH, thus maximizing the utilization of wire-bond single-side cooled HV IGBTs and eliminating the need for resistor-capacitor-diode (RCD) clamping snubbers. The performance of SHEM, together with the phase-shift-angle control, has been tested in the field on a 0-1780-kVAr capacitive 6.3-kV VSC-based D-STATCOM (-750/+900 kVAr VSC) prototype. Field-test results show that SHEM, together with phase-shift-angle control, leads to optimum switching frequency and device utilization for HV IGBTs and high system performance at the expense of slower response as compared to the other known control techniques. View full abstract»

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  • The Voltage-Controlled Compensation Ramp: A Waveshaping Technique for Power Factor Correctors

    Page(s): 1016 - 1027
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1093 KB) |  | HTML iconHTML  

    This paper deals with a new control method for power factor correctors. Control is carried out by a standard IC controller for peak current-mode DC-DC converters, with only an additional compensation ramp generator and peak detector. The fact that neither an analog multiplier nor an input voltage sensor is needed to achieve quasi-sinusoidal line waveforms makes this method very attractive. The method is similar to the one-cycle control method, but can be very easily adapted for use with topologies different to the boost converter, i.e., flyback, buck-boost, single-ended primary inductance converter, Cuk, and zeta topologies. Moreover, as the line current is cycle-by-cycle controlled, the resulting input current feedback loop is extremely fast, thus allowing the use of this type of control with high-frequency lines. View full abstract»

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  • A Sinusoidal PWM Method With Voltage Balancing Capability for Diode-Clamped Five-Level Converters

    Page(s): 1028 - 1034
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1268 KB) |  | HTML iconHTML  

    This paper presents a novel sinusoidal pulsewidth modulation control method with voltage balancing capability for the diode-clamped five-level rectifier/inverter system. A complete analysis of the voltage balance theory is given. The voltage balancing effects of the third harmonic offset injection to all three-phase voltages are discussed. The proposed control utilizes the offset voltage to regulate the average currents flowing into and out of the inner junction without affecting output line-to-line voltage. The voltage balancing was achieved by selecting proper offset voltages for both sides. A five-level experimental system is built up and used to prove the theory. View full abstract»

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  • Supercapacitor Thermal Modeling and Characterization in Transient State for Industrial Applications

    Page(s): 1035 - 1044
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (953 KB) |  | HTML iconHTML  

    A new thermal model, which allows temperature distribution determination inside a supercapacitor cell, is developed. The model is tested for a supercapacitor based on the activated carbon and organic electrolyte technology. In hybrid vehicle applications, supercapacitors are used as energy-storage devices, offering the possibility of providing the peak-power requirement. They are charged and discharged at a high current rate. The problem with this operating mode is the large amount of heat produced in the device which can lead to its destruction. An accurate thermal modeling of the internal temperature is required to design a cooling system for supercapacitor module, meeting the safety and reliability of the power systems. The purpose of this paper is to study the supercapacitor temperature distribution in steady and transient states. A thermal model is developed; it is based on the finite-differential method which allows for the supercapacitor thermal resistance determination. The originality of this paper is in the fact that a thermocouple (type K) was placed inside the supercapacitor from Maxwell Technologies. A test bench is realized. The cases of supercapacitor thermal distribution using natural and forced convection are studied. Simulations and experimental results are reported to validate the proposed model. The results obtained with this model may be used to determine the cooling system required for actual supercapacitor applications. View full abstract»

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  • Improvement of Wind-Generator Stability by Fuzzy-Logic-Controlled SMES

    Page(s): 1045 - 1051
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (253 KB) |  | HTML iconHTML  

    This paper proposes a fuzzy-logic-controlled superconducting magnetic energy storage (SMES) scheme for the stabilization of grid-connected wind-generator systems. The control scheme of SMES is based on a sinusoidal pulsewidth-modulation voltage-source converter and a two-quadrant dc-dc chopper using an insulated-gate bipolar transistor. A comparative study is carried out between the proposed fuzzy-logic-controlled SMES and the fuzzy-logic-based pitch controller to improve the wind- generator stability. Simulation results demonstrate that the performance of the proposed fuzzy-logic-controlled SMES is better than that of the fuzzy-logic-based pitch controller in order to stabilize the wind generator. View full abstract»

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  • Implementation and Analysis of an Improved Series-Loaded Resonant DC–DC Converter Operating Above Resonance for Battery Chargers

    Page(s): 1052 - 1059
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (437 KB) |  | HTML iconHTML  

    The well-established advantages of resonant converters, including simplicity of circuit configuration, ease of the control scheme, low switching losses, and low electromagnetic interference, among others, have led to their attracting more interest. This work develops a highly efficient battery charger with an improved series-loaded resonant converter for renewable energy applications to improve the performance of traditional switching-mode charger circuits. The switching frequency of the improved series-loaded resonant battery charger was at continuous conduction mode. Circuit operation modes are determined from the conduction profiles. Operating equations and operating theory are also developed. This study utilizes the fundamental wave approximation and a battery equivalent circuit to simplify the circuit analyses. The mean charging efficiency of the proposed topology is as high as 87.5%. View full abstract»

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  • The Use of Tribocharging in the Electrostatic Beneficiation of Lunar Simulant

    Page(s): 1060 - 1067
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (670 KB) |  | HTML iconHTML  

    The use of tribocharging as a potential method to provide sufficient charge to several different lunar simulants for electrostatic beneficiation was investigated. The objective was to determine whether specific minerals of interest (e.g., ilmenite) that are present in lunar regolith could be enriched in concentration by beneficiation that would therefore allow for more efficient extraction for in situ resource utilization use. The production of oxygen, water, and other resources on the Moon from raw materials is vital for future missions to the Moon. Successful separation of ilmenite was achieved for a prepared simulant (KSC-1), which is a mixture of pure commercially supplied pyroxene, olivine, feldspar, and ilmenite, in a 4 : 4 : 1 : 1 ratio, showing proof of concept when tribocharged against three different charging materials, namely, Al, Cu, and PTFE. Separation by chemical composition was also observed for existing lunar simulants JSC-1 and JSC-1A; however, the interpretation of the separation was difficult due to the complex mineralogy of the simulants compared to the simple prepared mixture. View full abstract»

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  • Relationship Between Surface Electrostatic Potential and Deposition of Airborne Bacteria

    Page(s): 1068 - 1073
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (615 KB) |  | HTML iconHTML  

    Recent work has demonstrated that airborne bacteria can carry high net charges which may influence their deposition onto surfaces. This paper investigated the relationship between surface electric potential relative to ground and the deposition rate of airborne bacteria. Nutrient-agar settle plates were charged to potentials of +/-5, +/- 2.5, and 0 kV and microbial deposition (CFU/cm2middoth) enumerated in an office restroom environment. Results showed that deposition rates were enhanced in proportion to the surface potential to a maximum of approximately twofold. The results were consistent with framework modeling of the relative contributions of electrostatic attraction (ESA), sedimentation, and diffusion deposition rates. It is concluded that ESA can significantly increase deposition rates under selected conditions. This has implications for health-care settings and may provide a basis for application of particle-deposition-reduction engineering controls that have been successfully employed in the semiconductor industry. View full abstract»

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  • Numerical and Experimental Modeling of Star-Connected Three-Phase Capacitors

    Page(s): 1074 - 1078
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (363 KB) |  | HTML iconHTML  

    This paper is aimed at characterizing two possible designs of star-connected three-phase capacitors developed for utilization with the protection schemes of industrial installations. A superficial charge simulation program was employed for estimating the capacitances of one design. The results pointed out the influence of various geometrical parameters on the magnitude of the mutual capacitance between the armatures of any two of the three elementary capacitors of the three-phase unit. The experimental results confirmed the theoretical predictions and validated the advantageous features of a second design, which ensured balanced mutual capacitances between the three phases. View full abstract»

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  • Multivariate Statistical Process Control of Electrostatic Separation Processes

    Page(s): 1079 - 1085
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (675 KB) |  | HTML iconHTML  

    Multivariate control charts are commonly used for monitoring processes, the quality of which is determined by two or more correlated output variables. The aim of this paper is to point out the effectiveness of multicriterion control charts for supervising the variability of the outcome of an electrostatic separation process. The experiments were carried out on samples of chopped electric cable wastes, similar to those currently processed by the recycling industry. The two output variables considered in this paper were the masses of product recovered in the middling and conductive compartments of the collector. When the separation process was in control, the two variables were correlated, and T 2-type control charts could be established. Two out-of-control situations were simulated. The multivariable control charts monitoring the process location and spread were able to detect these situations, although each output variable taken independently remained within the control limits. View full abstract»

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  • Capability Evaluation and Statistical Control of Electrostatic Separation Processes

    Page(s): 1086 - 1094
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (826 KB) |  | HTML iconHTML  

    The variability of the outcome is often deplored by the users of electrostatic separation equipment. A slight modification of the composition of the processed material, a change in the environmental conditions, or an alteration of the electrode configuration may cause objectionable fluctuation of product quality. Thus, the purity of the copper product recovered from electric cable wastes can easily diminish from 98%, which is fully acceptable for recycling purposes, to a value below the standard level of 97%. This paper is written with the aim of showing how statistical process control methods could contribute to the improvement of users' overall satisfaction. In order to validate a procedure for evaluating the short- and long-term capabilities of the electrostatic separation process, the authors carried out a series of experiments on subgroups of chopped electric cable wastes, which are similar to those currently processed in the recycling industry (95% polyvinyl chloride; 5% copper). The first set of experimental data showed that an ldquoin-controlrdquo electrostatic separation process can easily satisfy the level of performance required by the customers (i.e., a capability index of > 1.33). The same set of data enabled the computation of the upper and lower limits of the R- and X -bar control charts. The second set of experiments was designed to evaluate the ability of these charts to detect the following typical situations of abnormal operation of the electrostatic separation equipment: 1) a change in the composition of the processed material; 2) a failed connection of the static electrode to the high-voltage supply; and 3) the accumulation of dust on the surface of the corona electrode. Based on the authors' experience as consultants for the recycling industry, the following several recommendations have been formulated: 1) Evaluate the capability of the electrostatic separation process by performing no more than ten observations and making u- se of the confidence indexes; 2) use moving R- and X-bar control charts to obviate the difficulty of sampling; and 3) prepare a ldquoCorrective Actions Guiderdquo for the operators using control charts for monitoring. View full abstract»

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  • Control of IPM Synchronous Generator for Maximum Wind Power Generation Considering Magnetic Saturation

    Page(s): 1095 - 1105
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1682 KB) |  | HTML iconHTML  

    Permanent-magnet synchronous generators (PMSGs) are commonly used for small variable-speed wind turbines to produce high-efficiency, high-reliability, and low-cost wind power generation. This paper proposes a novel control scheme for an interior PMSG (IPMSG) driven by a wind turbine, in which the d-axis and q-axis stator-current components are optimally controlled to achieve the maximum wind power generation and loss minimization of the IPMSG. The effect of magnetic saturation, which causes the highly nonlinear characteristics of the IPMSG, is considered in the control-scheme design. The optimal d-axis stator-current command is obtained as a function of the IPMSG rotor speed by solving a constrained nonlinear-optimization problem that minimizes the copper and core losses of the IPMSG. At any wind speed within the operating range, the IPMSG rotor speed is optimally controlled to extract maximum wind power. The optimal q-axis stator-current command is then obtained from the optimal IPMSG rotor speed and d-axis current. To eliminate the effects of nonlinearity caused by magnetic saturation, an input-output feedback linearization technique is applied to design the high-performance nonlinear current controllers. The proposed control scheme provides the wind generation system with the maximum efficiency and high dynamic performance. View full abstract»

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Aims & Scope

The scope of the IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS includes all scope items of the IEEE Industry Applications Society, that is, the advancement of the theory and practice of electrical and electronic engineering in the development, design, manufacture, and application of electrical systems, apparatus, devices, and controls to the processes and equipment of industry and commerce; the promotion of safe, reliable, and economic installations; industry leadership in energy conservation and environmental, health, and safety issues; the creation of voluntary engineering standards and recommended practices; and the professional development of its membership.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Carlton E. Speck