Open Access Open Access  Restricted Access Subscription Access

Technology Upgradation with Multi Level Inverter – A Scheme for Life Enhancement of Short Circuit Alternator


Affiliations
1 Central Power Research Institute, India
 

Short circuit alternator is a specially designed synchronous generator used to supply bulk amount of energy required during testing of electrical power equipment. The alternator discussed here is of 1500MVA rating and can be operable in dual mode i.e. as a motor or as a generator. A static drive based on current source inverter (CSI) is used for motoring operation of this machine. Several phenomena such as high level of harmonics, common mode voltage, shaft voltage, bearing current have been observed in the present system. Eventually all these has a direct or indirect impact on the life of the machine and its journal bearings. A simulation model of the present system and its detailed analysis endorses that the conventional CSI is responsible for those effects. Multi level inverter is a boon to the inverter technology. Existing system is again modelled with the proposed 2-level&3-level inverters. Results show that 3-level inverter is the best proposition for up-gradation of the present system.
User
Notifications
Font Size

  • Bhowmik S, Spee R. A guide to the application oriented selection of AC/AC converter topologies. IEEE Transactions on Power Electronics. 1990 Apr; 8(2):156–63.

  • Akagi H, Doumoto T. An approach to eliminating high-frequency shaft voltage and ground leakage current from an inverter-driven motor. IEEE Trans Ind Appl. 2004; 40(4):1162–9.

  • Nabae A, Takahashi I, Akagi H. A New Neutral-point Clamped PWM inverter. IEEE Transaction on Industrial Applications. 1981; IA-17:518–23.

  • Rodriguez J, Jih-Sheng L, Peng FZ. Multilevel inverters: a survey of topologies, controls, and applications. IEEE Transactions on Industrial Electronics. 2002 Aug; 49(4):724–38.

  • Thanga RC, Srivastava SP, Agrawal P. Energy efficient control of three-phase induction motor-A review. International Journal of Computer and Electrical Engineering. 2009; 1(1):1793–8198.

  • Robert B, Fisher PE. Introduction of static frequency converters on SEPTA’s 25 Hz commuter rail system. Proc. ASME/IEEE Railroad Conf.; 1990. p. 149–55.

  • Park SH, Hwang S-H, Kim J-M. Ryu H-S, Lee J-H. A starting- up control algorithm of large synchronous generation motor for gas turbosets. Proc. IEEE Int Symp Ind Electron; 2008. p. 502–8.

  • Zhang YZ. Study of process of starting pumped storage machines by static frequency converter with field current controlled. Proc IEEE Int Conf Signal Process Syst; 2010. p. V1-224–7

  • Datta AK, Dubey M, Mondal NR, Raghavaiah BV. Motor-less operation of Short Circuit generator – A CPRI Perspective. International Conference on Electrical Power and Energy Systems (ICEPES-2010); 2010 Aug 26-28; Bhopal. p. 439–45.

  • Peterson T, Frank K. Starting of large synchronous motor using static frequency converter. Proc IEEE Summer Meet Int Symp High Power Testing; 1971 Jul 18-23; Portland. p. 172–9.

  • Datta AK, Ansari MA, Mondal NR, Raghavaiah BV. A novel use of power electronics: prime mover-less alternator with static drive & excitation system. International Journal of Electronics & Communication Technology. 2012 3(1):472–5.

  • The MathWorksTM, Inc., USA, Release 2008a (R2008a).


Abstract Views: 591

PDF Views: 228




  • Technology Upgradation with Multi Level Inverter – A Scheme for Life Enhancement of Short Circuit Alternator

Abstract Views: 591  |  PDF Views: 228

Authors

Arun Kumar Datta
Central Power Research Institute, India

Abstract


Short circuit alternator is a specially designed synchronous generator used to supply bulk amount of energy required during testing of electrical power equipment. The alternator discussed here is of 1500MVA rating and can be operable in dual mode i.e. as a motor or as a generator. A static drive based on current source inverter (CSI) is used for motoring operation of this machine. Several phenomena such as high level of harmonics, common mode voltage, shaft voltage, bearing current have been observed in the present system. Eventually all these has a direct or indirect impact on the life of the machine and its journal bearings. A simulation model of the present system and its detailed analysis endorses that the conventional CSI is responsible for those effects. Multi level inverter is a boon to the inverter technology. Existing system is again modelled with the proposed 2-level&3-level inverters. Results show that 3-level inverter is the best proposition for up-gradation of the present system.

References