Pub Date : 1997-06-16DOI: 10.1109/PAPCON.1997.595231
Yuexin Yin, A. Wu
This paper presents a new electric motor drive system topology, which is based on a pulse-width-modulation (PWM) current source inverter (CSI). It is aimed at reducing the current harmonics drawn from paper mill distribution systems and the electric utility. Meanwhile, the voltage harmonics feeding into the electric motors are significantly reduced. Furthermore, the voltage rate of rise of the PWM-CSI drives is low compared to the currently dominated PWM voltage source inverter (VSI) based motor drive systems. The paper also presents a proposal to modify the current paper mill machine motor drive systems in order to achieve an overall low harmonic level. The new topology is verified by computer simulations. The problems of the new motor drive system are also described.
{"title":"A low harmonic electric drive system based on current-source-inverter","authors":"Yuexin Yin, A. Wu","doi":"10.1109/PAPCON.1997.595231","DOIUrl":"https://doi.org/10.1109/PAPCON.1997.595231","url":null,"abstract":"This paper presents a new electric motor drive system topology, which is based on a pulse-width-modulation (PWM) current source inverter (CSI). It is aimed at reducing the current harmonics drawn from paper mill distribution systems and the electric utility. Meanwhile, the voltage harmonics feeding into the electric motors are significantly reduced. Furthermore, the voltage rate of rise of the PWM-CSI drives is low compared to the currently dominated PWM voltage source inverter (VSI) based motor drive systems. The paper also presents a proposal to modify the current paper mill machine motor drive systems in order to achieve an overall low harmonic level. The new topology is verified by computer simulations. The problems of the new motor drive system are also described.","PeriodicalId":346714,"journal":{"name":"Conference Record of 1997 Annual Pulp and Paper Industry Technical Conference","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134388004","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}
PWM inverter drive circuits using insulated gate bipolar transistors (IGBTs) have become the preferred standard for the variable speed control of induction motors because of their high reliability, good performance and relatively low cost. Despite the many benefits these drives offer, it is important to understand the consequences they can place on the motor insulation system. This is particularly important when considering the fast rise time of the inverter output voltage pulses when applied to installations using long connection cables between the inverter and motor. This paper first describes the potential problem a motor insulation system might experience when subjected to fast rise time inverter output voltage pulses in combination with long connection cables between the motor and inverter. Subsequently it reviews various inverter output filter arrangements that can be used to minimize motor insulation stress.
{"title":"Output filters for PWM drives with induction motors","authors":"P.T. Finlayson","doi":"10.1109/2943.644886","DOIUrl":"https://doi.org/10.1109/2943.644886","url":null,"abstract":"PWM inverter drive circuits using insulated gate bipolar transistors (IGBTs) have become the preferred standard for the variable speed control of induction motors because of their high reliability, good performance and relatively low cost. Despite the many benefits these drives offer, it is important to understand the consequences they can place on the motor insulation system. This is particularly important when considering the fast rise time of the inverter output voltage pulses when applied to installations using long connection cables between the inverter and motor. This paper first describes the potential problem a motor insulation system might experience when subjected to fast rise time inverter output voltage pulses in combination with long connection cables between the motor and inverter. Subsequently it reviews various inverter output filter arrangements that can be used to minimize motor insulation stress.","PeriodicalId":346714,"journal":{"name":"Conference Record of 1997 Annual Pulp and Paper Industry Technical Conference","volume":"263 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133563993","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}
Pub Date : 1900-01-01DOI: 10.1109/PAPCON.1997.595225
S. Khan, P. St-Onge, N. El-Dehaibi
The power system at Daishowa's TMP plant in Quebec city was commissioned in 1989. The two-line plant comprised two primary, two secondary and three rejects refiners. the primary and secondary refiner motors are rated 24000 HP each, and rejects are rated 6700 HP each. For increased pulp production, Daishowa decided to replace the existing 24000 HP P2 refiner motor with a new 32000 HP motor. The existing refiner was large enough to handle the increased production. An impact study was carried out to ensure that the refiner could be started and operated within the power system constraints, without adverse effect on the existing distribution system. The study included: power system analysis including load flow, short circuit and motor starting; voltage flicker and starting methods; review of equipment rating; selection of new equipment; motor performance during acceleration; and installation constraints. This paper describes the methodology used for the study and solutions found to circumvent the problems associated with the application of large refiner motors.
{"title":"Impact of a 32000 HP refiner motor on Daishowa's existing power system and equipment","authors":"S. Khan, P. St-Onge, N. El-Dehaibi","doi":"10.1109/PAPCON.1997.595225","DOIUrl":"https://doi.org/10.1109/PAPCON.1997.595225","url":null,"abstract":"The power system at Daishowa's TMP plant in Quebec city was commissioned in 1989. The two-line plant comprised two primary, two secondary and three rejects refiners. the primary and secondary refiner motors are rated 24000 HP each, and rejects are rated 6700 HP each. For increased pulp production, Daishowa decided to replace the existing 24000 HP P2 refiner motor with a new 32000 HP motor. The existing refiner was large enough to handle the increased production. An impact study was carried out to ensure that the refiner could be started and operated within the power system constraints, without adverse effect on the existing distribution system. The study included: power system analysis including load flow, short circuit and motor starting; voltage flicker and starting methods; review of equipment rating; selection of new equipment; motor performance during acceleration; and installation constraints. This paper describes the methodology used for the study and solutions found to circumvent the problems associated with the application of large refiner motors.","PeriodicalId":346714,"journal":{"name":"Conference Record of 1997 Annual Pulp and Paper Industry Technical Conference","volume":"23 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120902275","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}
Pub Date : 1900-01-01DOI: 10.1109/PAPCON.1997.595232
D. Ventruella, D. J. Beck
The practical installation and setting of pilot wire relays in the field presents a complex problem that may leave the designer uncertain of the reliability of the pilot wire relaying scheme. There are those designers of protective relaying schemes who would prefer to avoid the use of pilot wire relays altogether. A common concern that is often used to dismiss alternatives, is burden and sensitivity to ground fault currents on low resistance grounded systems. A method by which to determine the applicability of an alternative to pilot wire relays for industrial power systems and the scheme itself is summarized below. The burden issue is considered.
{"title":"An alternative to pilot wire relays for industrial power systems","authors":"D. Ventruella, D. J. Beck","doi":"10.1109/PAPCON.1997.595232","DOIUrl":"https://doi.org/10.1109/PAPCON.1997.595232","url":null,"abstract":"The practical installation and setting of pilot wire relays in the field presents a complex problem that may leave the designer uncertain of the reliability of the pilot wire relaying scheme. There are those designers of protective relaying schemes who would prefer to avoid the use of pilot wire relays altogether. A common concern that is often used to dismiss alternatives, is burden and sensitivity to ground fault currents on low resistance grounded systems. A method by which to determine the applicability of an alternative to pilot wire relays for industrial power systems and the scheme itself is summarized below. The burden issue is considered.","PeriodicalId":346714,"journal":{"name":"Conference Record of 1997 Annual Pulp and Paper Industry Technical Conference","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122073663","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}
Pub Date : 1900-01-01DOI: 10.1109/PAPCON.1997.595240
F. Newman
An inevitable part of any major paper mill expansion or modernization project is the need to provide additional horsepower for several loads in excess of that which the vendor recommended and the engineers selected. Classic examples of this problem are such things as pressure screens, pulpers and some large pumps. After exhausting all other "normal" remedies, such as correcting mechanical problems or adjusting operating conditions, the usual result is that a new motor of a higher rating is ordered and eventually installed. This decision is then usually followed by the ordering of a new spare since the spare previously ordered will not be of the correct rating. The problem is further compounded by the fact that one may also be stuck with at least two motors that one no longer needs. The total cost is, of course, dependent on the horsepower involved and the number of applications requiring correction, but these situations are generally very expensive by anyone's standards. Although this is the usual scenario, it need not be the only option in all cases. The introduction a few years ago of reliable, solid state, temperature-based overload devices has opened up another avenue for those applications where the motor is just a "little bit" undersized. In order to do this, however, it is necessary to redefine the thinking of a lot of engineering, maintenance, and operating personnel with respect to motor overload protection.
{"title":"Uncovering the hidden capacity in your medium voltage AC motors","authors":"F. Newman","doi":"10.1109/PAPCON.1997.595240","DOIUrl":"https://doi.org/10.1109/PAPCON.1997.595240","url":null,"abstract":"An inevitable part of any major paper mill expansion or modernization project is the need to provide additional horsepower for several loads in excess of that which the vendor recommended and the engineers selected. Classic examples of this problem are such things as pressure screens, pulpers and some large pumps. After exhausting all other \"normal\" remedies, such as correcting mechanical problems or adjusting operating conditions, the usual result is that a new motor of a higher rating is ordered and eventually installed. This decision is then usually followed by the ordering of a new spare since the spare previously ordered will not be of the correct rating. The problem is further compounded by the fact that one may also be stuck with at least two motors that one no longer needs. The total cost is, of course, dependent on the horsepower involved and the number of applications requiring correction, but these situations are generally very expensive by anyone's standards. Although this is the usual scenario, it need not be the only option in all cases. The introduction a few years ago of reliable, solid state, temperature-based overload devices has opened up another avenue for those applications where the motor is just a \"little bit\" undersized. In order to do this, however, it is necessary to redefine the thinking of a lot of engineering, maintenance, and operating personnel with respect to motor overload protection.","PeriodicalId":346714,"journal":{"name":"Conference Record of 1997 Annual Pulp and Paper Industry Technical Conference","volume":"180 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116022269","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}
Pub Date : 1900-01-01DOI: 10.1109/PAPCON.1997.595217
E. Byres, E. Hanschke
In late 1995, the data communications networks at the Fletcher Challenge Canada's Crofton pulp and paper mill had reached capacity and was suffering from overload conditions. The large growth in process control information and personal computers over the past few years was straining the existing coax and fiber optic systems' ability to reliably transfer data. In addition, the increased network complexity made the troubleshooting of the networks extremely difficult and time-consuming. This paper discusses the design methods used to create a new fiber optic backbone that would provide the data carrying capacity and reliability needed for the pulp and paper mill's computers and control systems. High speed network technologies such as ATM (asynchronous transfer mode), FDDI (fiber distributed data interface) and fast Ethernet were compared for their suitability in industrial environments. The design also incorporated Ethernet switches so that the existing Ethernet networks could attach at minimal cost. These switches subdivided the single large network that originally existed into approximately 24 subnetworks. This division greatly increased the network's allowable traffic capacity and prevented problems in any one area from propagating throughout the mill, thus reducing network and process downtime.
{"title":"Design of high speed fiber optics backbones for pulp and paper mills","authors":"E. Byres, E. Hanschke","doi":"10.1109/PAPCON.1997.595217","DOIUrl":"https://doi.org/10.1109/PAPCON.1997.595217","url":null,"abstract":"In late 1995, the data communications networks at the Fletcher Challenge Canada's Crofton pulp and paper mill had reached capacity and was suffering from overload conditions. The large growth in process control information and personal computers over the past few years was straining the existing coax and fiber optic systems' ability to reliably transfer data. In addition, the increased network complexity made the troubleshooting of the networks extremely difficult and time-consuming. This paper discusses the design methods used to create a new fiber optic backbone that would provide the data carrying capacity and reliability needed for the pulp and paper mill's computers and control systems. High speed network technologies such as ATM (asynchronous transfer mode), FDDI (fiber distributed data interface) and fast Ethernet were compared for their suitability in industrial environments. The design also incorporated Ethernet switches so that the existing Ethernet networks could attach at minimal cost. These switches subdivided the single large network that originally existed into approximately 24 subnetworks. This division greatly increased the network's allowable traffic capacity and prevented problems in any one area from propagating throughout the mill, thus reducing network and process downtime.","PeriodicalId":346714,"journal":{"name":"Conference Record of 1997 Annual Pulp and Paper Industry Technical Conference","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123018955","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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