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9. Experimental Study on Dead-Time Induced Oscillations in a 100-kW Open-Loop Induction Motor Drive

Author

Guha, Anirudh, Tripathi, Avanish, and Narayanan, G

Subjects
Electrical Engineering
Abstract

This paper reports instability and oscillations in the stator current under light-load conditions in a practical 100-kW induction motor drive. Dead-time is shown to be a cause for such oscillations. This paper shows experimentally that these oscillations could be mitigated significantly with the help of a simple dead-time compensation scheme.

Published
2013

17. Circuit breaker transient recovery voltage analysis with shunt capacitor bank configurations

Author

Guha, Anirudh

Subjects
Transient recovery voltage, Ungrounded capacitor banks, Neutral displacement voltage, Current-limiting reactors
Abstract

Transient Recovery Voltage (TRV) is an important consideration in the selection and installation of circuit breakers with appropriate ratings. Capacitor banks with inrush current limiting reactors are an integral part of the power system. Capacitor banks with inrush reactors on the load side terminal of the capacitor breaker alter the TRV seen across the breaker and it is critical to carry out the TRV analysis to prevent circuit breaker failure. TRV analysis has been performed for various capacitor bank - inrush reactor configurations, with the fault occurring at different terminals on the load side. Analytical solutions have been presented for both single-phase and three-phase ungrounded capacitor banks. Neutral displacement voltage of three-phase ungrounded capacitor banks result in increased stress across the breaker. Results have been validated with PSCAD simulation and MATLAB plots.

Published
2010

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