CANDU nuclear power plants presently use fixed speed motors to power their processes. Control of the processes involve the “throttling” of liquids by incremental by-passing pumping action. This is achieved by the use of process control valves of which a typical CANDU station has more than a hundred. The elimination of many of these valves, the simplification of the control circuit algorithm, plus the increased speed and precision of process control and elimination of the need for constant full power motor operation creates an opportunity for capital cost saving, energy efficiency and engineering cost saving for CANDU plants. Safety considerations that may require low speed operations or simultaneous starting of the HT (heat transport) motors can be achieved by powering the motors with variable speed drives. The implementation of mature and at the same time, evolutionary technology used in variable speed drives in new and existing CANDU stations can enhance O, M and A effectiveness, reduce the need for complex process control hardware/software and augment the station net output power by reducing station load requirements. Before this is attempted, all variable speed drive inherent design attributes must be rationalised for CANDU use. In addition, variable speed drive characteristics must be compared against CANDU control and safety requirements and philosophies. This study looks at the pros and cons of variable speed drives and also provides guidance on how to proceed with implementation into the CANDU design.
{"title":"Feasibility of variable speed motor drives for CANDU nuclear power plants","authors":"L. Eng","doi":"10.1049/CP:19991039","DOIUrl":"https://doi.org/10.1049/CP:19991039","url":null,"abstract":"CANDU nuclear power plants presently use fixed speed motors to power their processes. Control of the processes involve the “throttling” of liquids by incremental by-passing pumping action. This is achieved by the use of process control valves of which a typical CANDU station has more than a hundred. The elimination of many of these valves, the simplification of the control circuit algorithm, plus the increased speed and precision of process control and elimination of the need for constant full power motor operation creates an opportunity for capital cost saving, energy efficiency and engineering cost saving for CANDU plants. Safety considerations that may require low speed operations or simultaneous starting of the HT (heat transport) motors can be achieved by powering the motors with variable speed drives. The implementation of mature and at the same time, evolutionary technology used in variable speed drives in new and existing CANDU stations can enhance O, M and A effectiveness, reduce the need for complex process control hardware/software and augment the station net output power by reducing station load requirements. Before this is attempted, all variable speed drive inherent design attributes must be rationalised for CANDU use. In addition, variable speed drive characteristics must be compared against CANDU control and safety requirements and philosophies. This study looks at the pros and cons of variable speed drives and also provides guidance on how to proceed with implementation into the CANDU design.","PeriodicalId":248698,"journal":{"name":"International Electric Machines and Drives Conference","volume":"21 1 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":"132665488","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 current state of wisdom in predicting electromagnetically-induced stator vibration and noise considers oscillatory radial forces acting in the airgap at the tips of stator teeth. The same oscillations in magnetic flux density which cause these forces also cause internal stresses in the magnetic iron and there is not a consensus as to the relative importance of these. This paper presents a method by which the importance of magnetostriction as a vibration-induction mechanism can be quantified.
{"title":"Magnetostrictive excitation of vibration in machines-a modal approach","authors":"S. Garvey, C. N. Glew","doi":"10.1049/CP:19991012","DOIUrl":"https://doi.org/10.1049/CP:19991012","url":null,"abstract":"The current state of wisdom in predicting electromagnetically-induced stator vibration and noise considers oscillatory radial forces acting in the airgap at the tips of stator teeth. The same oscillations in magnetic flux density which cause these forces also cause internal stresses in the magnetic iron and there is not a consensus as to the relative importance of these. This paper presents a method by which the importance of magnetostriction as a vibration-induction mechanism can be quantified.","PeriodicalId":248698,"journal":{"name":"International Electric Machines and Drives Conference","volume":"33 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":"134632276","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}
This paper derives an equivalent circuit for an induction motor. This model can be used in a time domain simulation to study the steady state performance of drives when the motor is supplied from a voltage type variable frequency inverter, and is particularly useful when used in conjunction with a time stepping circuit analysis program. It is shown that the conventional equivalent circuit model does not give the correct current waveform in cases when the applied motor voltage contains harmonics. This is allowed for in the new model and a comparison is made with a full representation of the machine using coupled stator and rotor windings.
{"title":"A time domain equivalent circuit for the inverter-fed induction motor","authors":"K. Smith, L. Ran","doi":"10.1049/CP:19990979","DOIUrl":"https://doi.org/10.1049/CP:19990979","url":null,"abstract":"This paper derives an equivalent circuit for an induction motor. This model can be used in a time domain simulation to study the steady state performance of drives when the motor is supplied from a voltage type variable frequency inverter, and is particularly useful when used in conjunction with a time stepping circuit analysis program. It is shown that the conventional equivalent circuit model does not give the correct current waveform in cases when the applied motor voltage contains harmonics. This is allowed for in the new model and a comparison is made with a full representation of the machine using coupled stator and rotor windings.","PeriodicalId":248698,"journal":{"name":"International Electric Machines and Drives Conference","volume":"9 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":"132715738","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：