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The Influence of Volts/Hertz Control on Filter Impedance Effects in VSI-Fed Induction Machines

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2 Author(s)
Fukazawa, Kazuo ; Mitsubishi Electric Corporation, Nagoya, Japan. ; Novotny, D.W.

The use of a transient volts/hertz controller can produce great improvement in the dynamic behavior of a voltage source inverter (VSI)-fed induction machine with a dc link filter. The effects of transient volts/hertz control are investigated and methods for selecting the proper controller gain GW for a wide range of systems are given. The information is presented in terms of 1) the upper and lower critical gains (GWCU and GWCL) needed to ensure stability, 2) a form of optimum gain (GWB) which gives the best dynamic performance for a specific machine and operating point, and 3) an acceptable gain (GWA) which gives acceptable dynamic performance over a range of operating conditions. Utilizing nondimensional parameters, eigen-values, and root locus plots, the values of the gains of the volts/hertz control are studied for a wide range of parameters. Graphs of the critical gains and methods of choosing GWB and GWA are presented. The results indicate that volts/hertz control can always be used to improve system dynamics, and with properly chosen controller gain the dynamic performance of the inverter-filter-motor system is typically better than the motor alone for a wide range of motor sizes and operating conditions.

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Industry Applications, IEEE Transactions on  (Volume:IA-18 ,  Issue: 3 )