{"title":"CURRENT CONTROL ALGORITHMS FOR SWITCHED RELUCTANCE MACHINE SERVO DRIVE","authors":"H. Henao, G. Capolino, E. Bassily, M. Poloujadoff","doi":"10.1080/07313569808955874","DOIUrl":"https://doi.org/10.1080/07313569808955874","url":null,"abstract":"The purpose of this paper is the development of efficient algorithms to control the current of a switched reluctance motor (SRM) with reduced current peaks for both low and high speed operations. In this way, a comparative study of the SRM performances applying three different current control strategies has been performed. The natural-sampled pulse-width modulation (PWM) and the hysteresis-band current control with both fixed and adaptive hysteresis-band have been tested and compared for a 4-phase, 6-pole SRM fed by a symmetrical voltage-static inverter (VSI). The comparison of the different algorithms is presented on the base of the limitation of maximum switching frequency for the power semiconductors.","PeriodicalId":262115,"journal":{"name":"Electric Machines and Power Systems","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117046603","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}
{"title":"MODELING AND ELIMINATION OF LOAD BUSES IN OPTIMAL POWER FLOW SOLUTIONS","authors":"J. Talaq","doi":"10.1080/07313569808955876","DOIUrl":"https://doi.org/10.1080/07313569808955876","url":null,"abstract":"ABSTRACT This paper presents a method to solve the optimal power flow problem after eliminating load buses from the system. Loads are first modeled and reflected in the admittance matrix and then their respective buses are eliminated. The obtained model is a reduced model of the original system. The admittance matrix is of the same order as the number of voltage-controlled buses in the system. The variables of the reduced model are the voltage-controlled buses voltages, angles and active power generations. Newton Raphson method is used to calculate the variables of the reduced model while minimizing an objective function. Voltages and angles of the original system are then calculated by a direct method. These voltages are required to update load models and to check for voltage and line current violations at the eliminated portions of the network. The simulation is carried out on two systems, IEEE 118 bus test system and a 131 bus actual system. It is shown that solution time is significantly reduced when ...","PeriodicalId":262115,"journal":{"name":"Electric Machines and Power Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115246599","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}
{"title":"Designing 2 pole and 2/4 pole windings by the simulated annealing method","authors":"M. Poloujadoff, J. Mipo, P. Siarry","doi":"10.1080/07313569808955877","DOIUrl":"https://doi.org/10.1080/07313569808955877","url":null,"abstract":"The object of the present paper is to explore the possibility of using simulated annealing procedures to determine multi-speed three phase windings. It is limited to the very simple case of p/2p polarities. The program has yielded the very well known solutions; thus, research may proceed towards more difficult problems.","PeriodicalId":262115,"journal":{"name":"Electric Machines and Power Systems","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129963471","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}
{"title":"THE APPLICATION OF FINITE ELEMENT METHOD FOR MORE ACCURATE CALCULATION AND ANALYSIS OF TURBOGENERATOR PARAMETERS","authors":"D. Ban, D. Žarko, Z. Maljkovic","doi":"10.1080/07313569808955879","DOIUrl":"https://doi.org/10.1080/07313569808955879","url":null,"abstract":"The paper describes a computation of basic electromagnetic parameters of a turbogenerator using 2D finite element method with completely automated preprocessing. The results obtained by 2D method are compared to the ones obtained by classical (analytical) method and to the measured values from tests carried out on a 194 MVA turbogenerator manufactured by KONCAR-Generatori, Zagreb, Croatia. It appears that finite element method combined with analytical method gives more accurate results than analytical method and that the computation time can be quite acceptable.","PeriodicalId":262115,"journal":{"name":"Electric Machines and Power Systems","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129112916","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}
{"title":"A FAULT LOCATION ALGORITHM FOR TRANSMISSION LINES","authors":"L. Sheng, S. Elangovan","doi":"10.1080/07313569808955872","DOIUrl":"https://doi.org/10.1080/07313569808955872","url":null,"abstract":"ABSTRACT This paper presents an algorithm for the computation of fault location for a transmission line by means of the voltage and current signals, acquired by the digital distance relays at both the terminals of the line. Based on the proposed algorithm, the fault distance can be calculated accurately and quickly, even though the two digital distance relays are of different types with different sampling frequencies. This proposed fault location method is suitable for the condition that there are communication links between a power grid dispatch centre and the digital distance relays.","PeriodicalId":262115,"journal":{"name":"Electric Machines and Power Systems","volume":"241 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123332671","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}
{"title":"POWER FLOW CONTROL IN SYSTEMS WITH FACTS DEVICES","authors":"D. Gotham, G. Heydt","doi":"10.1080/07313569808955869","DOIUrl":"https://doi.org/10.1080/07313569808955869","url":null,"abstract":"ABSTRACT The modern trend for consolidating electric power companies, even though the participants in these mergers may be not well connected electrically, suggests that technologies that permit power flow control in AC power networks may be favored for some applications. In this paper, the analysis of steady state power flow control in the presence of flexible AC transmission system devices (FACTS devices) is discussed. Objectives such as wheeling, line loading and unloading, ‘electronic fence’ methods to block power transfer, prevention of loop flows, and steady state security enhancement using FACTS are discussed. Newton-Raphson power flow studies for systems with FACTS devices are discussed. An example based on a large American power system is presented.","PeriodicalId":262115,"journal":{"name":"Electric Machines and Power Systems","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129111154","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}
{"title":"ECONOMICAL GENERATION RESERVE IN ISOLATED POWER SYSTEMS","authors":"M. El-Sayed","doi":"10.1080/07313569808955870","DOIUrl":"https://doi.org/10.1080/07313569808955870","url":null,"abstract":"ABSTRACT This paper presents a new technique to determine the economical generation reserve for isolated power systems. The reserve is classified as short-term and long-term. For planning short-term power reserve to determine the required load shedding for avoiding blackout for severe emergency conditions, the dynamic behavior of the system after generating unit outages is performed, and the resulting frequency decay is analyzed. Therefore, the economical short-term reserve is determined to minimize the summation costs for reserve provision, plus the equivalent cost of the required load shedding. For planning of long-term reserve, the utility investments and other decisions factors that affect electric service reliability should be explicitly evaluated, on the basis of their cost and benefit implications. A cost benefit approach, that quantifies the power reserve benefit in terms of the reduction in unserved energy cost, enables the evaluation of generation capacity additions. To determine the economic sh...","PeriodicalId":262115,"journal":{"name":"Electric Machines and Power Systems","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114348247","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}
Zhonghui Luo, Ratnesh Kumar, J. Sottile, J. Yingling
{"title":"An milp formulation for load-side demand control","authors":"Zhonghui Luo, Ratnesh Kumar, J. Sottile, J. Yingling","doi":"10.1080/07313569808955868","DOIUrl":"https://doi.org/10.1080/07313569808955868","url":null,"abstract":"ABSTRACT This paper presents a mixed integer linear programming formulation for load-side control of electrical energy demand. The formulation utilizes demand prediction to determine if control actions are necessary, and it schedules both shedding and restoration times based on an optimization model that minimizes the net cost of load shedding. Operational constraints are satisfied through the use of minimum/maximum uptimes/downtimes, which depend upon the current state of the system. The algorithm is evaluated using a simulation model of an underground coal mining operation where, (i) its performance is compared with a traditional static, priority-based, load-shedding schedule, and, (ii) its potential is established for producing net savings through demand control.","PeriodicalId":262115,"journal":{"name":"Electric Machines and Power Systems","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114710755","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}
{"title":"VOLTAGE COLLAPSE AND CONTROL ACTIONS: EFFECTS AND LIMITATIONS","authors":"A. C. Souza, N.H.M.N. Brito","doi":"10.1080/07313569808955866","DOIUrl":"https://doi.org/10.1080/07313569808955866","url":null,"abstract":"This paper focuses on control actions determination for voltage collapse prevention. Sensitivity matrices are proposed based on the knowledge of the critical bus. By critical bus one means that bus whose state variables vary at most at the voltage collapse point. A tangent vector is used to identify the critical bus, and its behavior as a function of load increase is also investigated and compared with other indices previously proposed. It is shown that generator control actions may not work to increase voltage collapse margin, whereas local control actions may produce better results. The tests are carried out in the IEEE-300 bus test system, with and without reactive power limits consideration.","PeriodicalId":262115,"journal":{"name":"Electric Machines and Power Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129842933","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}
{"title":"DESIGN AND PERFORMANCE EVALUATION OF A NEW DISC-TYPE MICROMOTOR WITH ETCHED WINDINGS","authors":"F. Marignetti, M. Scarano","doi":"10.1080/07313569808955865","DOIUrl":"https://doi.org/10.1080/07313569808955865","url":null,"abstract":"The paper summarizes some of the results obtained by an investigation made on a new disc-type micromotor. Starting by the description of the special design features of the motor, a mathematical model using space vectors is introduced, taking into account all the harmonic content of the air-gap flux-density distribution. Consequently, motor performances at steady-state are evaluated. Particular attention is paid to some quantities of specific interest for the design, such as and mechanical strains on each etched stator bar and on the outer ring.","PeriodicalId":262115,"journal":{"name":"Electric Machines and Power Systems","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125194410","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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