Improving synchronous reluctance machine performance by direct capacitance injection through an auxiliary winding
- Authors: Ogunjuyigbe, A. S. O. , Jimoh, A. A. , Nicolae, Dan-Valentin
- Date: 2007
- Subjects: Synchronous generators , Capacitors , Power-factor meters
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/20415 , uj:16094 , Citation: Ogunjuyigbe, A.S.O., Jimoh, A.A. & Nicolae, D.V. 2007. Improving synchronous reluctance machine performance by direct capacitance injection through an auxiliary winding. ICEMS’07 International Conference on Electrical Machines and Systems 2007, October 8-11, Seoul Olympic Parktel, Seoul, Korea:1055-1060
- Description: Abstract: Synchronous reluctance machine with a conventional rotor structure and a 3-phase auxiliary winding attached to a balanced capacitance for power factor improvement will find application in high speed , high power drives. This paper presents an understanding of its operation using the electromagnetic as well as the electric circuit concepts. Analytical and simulation results of this machine configuration show that the torque as well as the power factor performance is better compared to conventional reluctance machine.
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Single-phase unity power factor rectifier with improved dynamic response for non-linear load
- Authors: Nicolae, Dan-Valentin
- Date: 2007
- Subjects: Time delay systems , Power-factor meters , Switching equipment
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/21126 , uj:16114 , ISSN:18276660 , Citation: Nicolae, D.V. 2007. Single-phase unity power factor rectifier with improved dynamic response for non-linear load. International Review of Electrical Electrical Engineering, 2(4):537-543, July-August 2007.
- Description: Abstract: In this paper, a robust controller asserting a unity power factor rectifier is studied. The inner current control loop is a hysteresis type with switching frequency kept below a maximum imposed value; the harmonics generated are spread in certain range below the maximum imposed frequency and thus reducing the electromagnetic interference. The voltage controller feed-forwards the information about the dc output power to improve the dynamic response for any type of dc load. To demonstrate the improved response of the voltage regulator, a buck regulator as non-linear load drawing approximately 2.5 kW, is used.
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