Self-commissioning is a novel feature of modern inverter-fed induction-motor drives. It is part of the software of the control system and controls the sequence of commissioning, determines the electrical and mechanical parameters of the drive, and sets the control parameters and controller coefficients accordingly. Faults in the control system, the inverter, or the motor are detected and monitored as early as possible. The electrical parameters are determined at standstill. During the first acceleration the speed controller is adjusted by a method independent of the torque-speed characteristic of the drive. Stable operation is obtained even in the case of torsionally flexible coupling. The self-commissioning program adjusts the control system fast, reliably, and accurately with no need for specially trained commissioning engineers or additional measuring equipment.<>
{"title":"Fast and reliable commissioning of AC variable speed drives by self-commissioning","authors":"H. Schierling","doi":"10.1109/IAS.1988.25105","DOIUrl":"https://doi.org/10.1109/IAS.1988.25105","url":null,"abstract":"Self-commissioning is a novel feature of modern inverter-fed induction-motor drives. It is part of the software of the control system and controls the sequence of commissioning, determines the electrical and mechanical parameters of the drive, and sets the control parameters and controller coefficients accordingly. Faults in the control system, the inverter, or the motor are detected and monitored as early as possible. The electrical parameters are determined at standstill. During the first acceleration the speed controller is adjusted by a method independent of the torque-speed characteristic of the drive. Stable operation is obtained even in the case of torsionally flexible coupling. The self-commissioning program adjusts the control system fast, reliably, and accurately with no need for specially trained commissioning engineers or additional measuring equipment.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127620273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Two methods are presented for the analysis of operation of a self-excited induction generator that also provide a procedure for the computation of the required external capacitance. With this procedure the minimum and maximum values of speed, frequency, voltage, and output power can be easily determined. The analysis is only valid for different steady-state conditions. One method makes use of the basic equivalent circuit of the asynchronous generator and its associated equations, together with the magnetization curve of the machine. As long as the frequency is no longer constant in stand-alone operation, the second method analyzes the generator in the frequency domain, thus making it possible to determine the conditions for self-excitation under different loads.<>
{"title":"Analysis and design of wind turbine driven self-excited induction generator","authors":"P. G. Casielles, L. Zarauza, J. Sanz","doi":"10.1109/IAS.1988.25050","DOIUrl":"https://doi.org/10.1109/IAS.1988.25050","url":null,"abstract":"Two methods are presented for the analysis of operation of a self-excited induction generator that also provide a procedure for the computation of the required external capacitance. With this procedure the minimum and maximum values of speed, frequency, voltage, and output power can be easily determined. The analysis is only valid for different steady-state conditions. One method makes use of the basic equivalent circuit of the asynchronous generator and its associated equations, together with the magnetization curve of the machine. As long as the frequency is no longer constant in stand-alone operation, the second method analyzes the generator in the frequency domain, thus making it possible to determine the conditions for self-excitation under different loads.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126419162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
For pt.I see ibid., p.142-8 (1988). Modeling of solenoids activated from a DC source (impact excitation) is difficult because of the coupling of a nonlinear magnetic system, which includes eddy currents, with a mechanical system that involves a time-varying airgap. The finite-element method (in two dimensions) has been successfully implemented to solve this complex problem. However, the large number of successive iterations involved makes it inconvenient when repeated design trials are made, for instance, during optimization. It is shown that the problem geometry, including eddy currents, can be satisfactorily approximated using only one dimension. The resulting set of equations is solved using the finite-difference method. Comparisons with test data and with 2-D finite-element calculations are conclusive.<>
{"title":"Dynamic model of solenoids under impact excitation, including motion and body currents. II","authors":"B. Lequesne","doi":"10.1109/IAS.1988.25055","DOIUrl":"https://doi.org/10.1109/IAS.1988.25055","url":null,"abstract":"For pt.I see ibid., p.142-8 (1988). Modeling of solenoids activated from a DC source (impact excitation) is difficult because of the coupling of a nonlinear magnetic system, which includes eddy currents, with a mechanical system that involves a time-varying airgap. The finite-element method (in two dimensions) has been successfully implemented to solve this complex problem. However, the large number of successive iterations involved makes it inconvenient when repeated design trials are made, for instance, during optimization. It is shown that the problem geometry, including eddy currents, can be satisfactorily approximated using only one dimension. The resulting set of equations is solved using the finite-difference method. Comparisons with test data and with 2-D finite-element calculations are conclusive.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"271 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121487860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The benefits of controlling power factor are briefly reviewed. Power-factor compensators suitable for mine power systems are discussed along with a novel implementation of an adaptive power factor controller. An economic analysis technique for determining the amount and type of compensation is given. A procedure for sizing compensators in mine power systems is recommended.<>
{"title":"Power factor and power factor control alternatives for mines","authors":"M. Oommen, J. Kohler","doi":"10.1109/IAS.1988.25213","DOIUrl":"https://doi.org/10.1109/IAS.1988.25213","url":null,"abstract":"The benefits of controlling power factor are briefly reviewed. Power-factor compensators suitable for mine power systems are discussed along with a novel implementation of an adaptive power factor controller. An economic analysis technique for determining the amount and type of compensation is given. A procedure for sizing compensators in mine power systems is recommended.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123315999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A novel drive system for a switched-reluctance (SR) motor is described. The system needs no position sensor and has no discrete current sensors for regulating phase currents. Instead, the drive uses power MOSFET transistors with integrated pilot devices for current feedback when the switches are 'off', a fixed off-time chopping strategy is used to control the phase currents. To eliminate the position sensor normally required for SR motor control, the controller estimates the rotor position using phase inductance measurements. This position estimation scheme is sufficiently precise to allow positioning of the phase firing pulses to within approximately two electrical degrees of the desired rotor angle, and full four-quadrant operation of the system is possible. A laboratory prototype system has been built and tested at speeds up to 3000 rpm. The system shows good performance in all four operating quadrants, including zero speed. The entire control for the system is implemented in a single low-cost microprocessor.<>
{"title":"Application of sensor integration techniques to switched reluctance motor drives","authors":"S. R. Macminn, P. Szczesny, W.J. Rzesos, T. Jahns","doi":"10.1109/IAS.1988.25120","DOIUrl":"https://doi.org/10.1109/IAS.1988.25120","url":null,"abstract":"A novel drive system for a switched-reluctance (SR) motor is described. The system needs no position sensor and has no discrete current sensors for regulating phase currents. Instead, the drive uses power MOSFET transistors with integrated pilot devices for current feedback when the switches are 'off', a fixed off-time chopping strategy is used to control the phase currents. To eliminate the position sensor normally required for SR motor control, the controller estimates the rotor position using phase inductance measurements. This position estimation scheme is sufficiently precise to allow positioning of the phase firing pulses to within approximately two electrical degrees of the desired rotor angle, and full four-quadrant operation of the system is possible. A laboratory prototype system has been built and tested at speeds up to 3000 rpm. The system shows good performance in all four operating quadrants, including zero speed. The entire control for the system is implemented in a single low-cost microprocessor.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"537 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126300181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Industrial drive systems are difficult to control efficiently, because of the nonlinear transfer function and the extremely fast response of their feeding power electronic converters. In view of this, the authors present a novel algorithm which takes advantage of the minimal prototype concept (fast response) and variable-structure and sliding-system concepts. This algorithm synthesizes two regulators: minimal response sliding (MRS) and minimal response integral sliding (MRIS). Both of these regulators rescind an error in minimal time. However, the first regulator allows an error which is cancelled by the second one.<>
{"title":"Integral-sliding mode as a new method to control the industrial drives","authors":"S. Lorenzo, M. Shaker, J. M. Ruiz, A. Martin","doi":"10.1109/IAS.1988.25191","DOIUrl":"https://doi.org/10.1109/IAS.1988.25191","url":null,"abstract":"Industrial drive systems are difficult to control efficiently, because of the nonlinear transfer function and the extremely fast response of their feeding power electronic converters. In view of this, the authors present a novel algorithm which takes advantage of the minimal prototype concept (fast response) and variable-structure and sliding-system concepts. This algorithm synthesizes two regulators: minimal response sliding (MRS) and minimal response integral sliding (MRIS). Both of these regulators rescind an error in minimal time. However, the first regulator allows an error which is cancelled by the second one.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115049039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An AC/DC conversion scheme is presented which eliminates the need for self-commutated devices and requires only 12 thyristors for full double bridge AC to AC power conversion. The system utilizes a series resonant DC link between the AC/DC and DC/AC converters. This series resonant scheme is, in effect, the dual of the parallel DC resonant converter. The DC resonant circuit can be essentially considered as a commutating circuit which ensures turn-off of all twelve thyristors by providing the necessary zero-current instants. A significantly improved sinusoidal current waveform can be obtained at both the input and output compared to conventional high-power converters by the use of high-frequency pulse density modulation.<>
{"title":"High frequency series resonant DC link power conversion","authors":"Y. Murai, T. Lipo","doi":"10.1109/IAS.1988.25149","DOIUrl":"https://doi.org/10.1109/IAS.1988.25149","url":null,"abstract":"An AC/DC conversion scheme is presented which eliminates the need for self-commutated devices and requires only 12 thyristors for full double bridge AC to AC power conversion. The system utilizes a series resonant DC link between the AC/DC and DC/AC converters. This series resonant scheme is, in effect, the dual of the parallel DC resonant converter. The DC resonant circuit can be essentially considered as a commutating circuit which ensures turn-off of all twelve thyristors by providing the necessary zero-current instants. A significantly improved sinusoidal current waveform can be obtained at both the input and output compared to conventional high-power converters by the use of high-frequency pulse density modulation.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125788664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Optimal control systems require responsive controllers to manipulate the control variables found in the physical plant. On large industrial control systems operating over plant-wide communications networks, delays associated with data transmission can present formidable problems to the control system designer. Although these problems can be minimized through the use of high-speed data-transmission methods, an alternative is the use of a distributed control arrangement. For many facilities, distributed control arrangements exist in the form of programmable logic controllers (PLCs) linked via local area networks (LANs). Although such systems are primarily intended to deal with logical operations, interfacing with continuous-time systems, such as adjustable-speed drives, is usually required. Responsive closed-loop-drive operation using the PLC as the controller is usually not practical without extensive hardware additions to the PLC system. However, by embedding a local controller within the adjustable speed drive and allowing the PLC to act as a system controller, the distributed control system can be implemented. A description is given of such a system implementation incorporated into an AC adjustable frequency drive controller. Some basic characteristics and attributes of such a system are described.<>
{"title":"A programmable local controller for AC adjustable frequency drive controllers","authors":"J. Lipták, R. Orndorff, M. E. Innes","doi":"10.1109/IAS.1988.25118","DOIUrl":"https://doi.org/10.1109/IAS.1988.25118","url":null,"abstract":"Optimal control systems require responsive controllers to manipulate the control variables found in the physical plant. On large industrial control systems operating over plant-wide communications networks, delays associated with data transmission can present formidable problems to the control system designer. Although these problems can be minimized through the use of high-speed data-transmission methods, an alternative is the use of a distributed control arrangement. For many facilities, distributed control arrangements exist in the form of programmable logic controllers (PLCs) linked via local area networks (LANs). Although such systems are primarily intended to deal with logical operations, interfacing with continuous-time systems, such as adjustable-speed drives, is usually required. Responsive closed-loop-drive operation using the PLC as the controller is usually not practical without extensive hardware additions to the PLC system. However, by embedding a local controller within the adjustable speed drive and allowing the PLC to act as a system controller, the distributed control system can be implemented. A description is given of such a system implementation incorporated into an AC adjustable frequency drive controller. Some basic characteristics and attributes of such a system are described.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134642682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The design of reversing armature power supplies for DC motors is considered. An LSI firing circuit, in conjunction with a high-speed digital signal processor (DSP), has been developed to adjust the firing angle between 0 degrees and 180 degrees for both positive and negative current control in a dual antiparallel-connected three-phase converter connected to a DC motor. A fast-response current controller is obtained by using feedforward techniques and a variable-structure proportional-integral compensator to produce an optimal current response under both continuous and discontinuous current conduction.<>
{"title":"A fast-response current controller for microprocessor-based SCR-DC motor drives","authors":"T.D. Collings, W. Wilson","doi":"10.1109/IAS.1988.25111","DOIUrl":"https://doi.org/10.1109/IAS.1988.25111","url":null,"abstract":"The design of reversing armature power supplies for DC motors is considered. An LSI firing circuit, in conjunction with a high-speed digital signal processor (DSP), has been developed to adjust the firing angle between 0 degrees and 180 degrees for both positive and negative current control in a dual antiparallel-connected three-phase converter connected to a DC motor. A fast-response current controller is obtained by using feedforward techniques and a variable-structure proportional-integral compensator to produce an optimal current response under both continuous and discontinuous current conduction.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132410218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An integrated flat-rolled products plant that demonstrates the use of a thin-slab caster to feed 2 inch cast products into a continuous hot finishing mill is discussed. Electric arc furnaces produce the steel that flows through the continuous caster. The thin-slab product is cut and fed into a soaking furnace in preparation for rolling in a four-stand hot-strip mill. This production technology produces hot rolled coils without any slab yard, slab reheat furnace, or hot-strip roughing mills. The capital investment is much lower and the production yield efficiency is much higher as compared with the conventional methods. The multilevel distributed control system is modular and flexible to accommodate the simple slitting line as well as the more complex hot-finishing mill and the reversing cold mill. The system controls several processes.<>
{"title":"The innovative distributed control system for an innovative flat rolled products plant","authors":"A. Smith","doi":"10.1109/IAS.1988.25206","DOIUrl":"https://doi.org/10.1109/IAS.1988.25206","url":null,"abstract":"An integrated flat-rolled products plant that demonstrates the use of a thin-slab caster to feed 2 inch cast products into a continuous hot finishing mill is discussed. Electric arc furnaces produce the steel that flows through the continuous caster. The thin-slab product is cut and fed into a soaking furnace in preparation for rolling in a four-stand hot-strip mill. This production technology produces hot rolled coils without any slab yard, slab reheat furnace, or hot-strip roughing mills. The capital investment is much lower and the production yield efficiency is much higher as compared with the conventional methods. The multilevel distributed control system is modular and flexible to accommodate the simple slitting line as well as the more complex hot-finishing mill and the reversing cold mill. The system controls several processes.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133556926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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