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A variable frequency space vector modulator for VSI fed induction motor drives

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A variable frequency space vector modulator for VSI fed induction motor drives
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  A variable frequency space vector modulator for VSI fed induction motor drives 1.   J. F. Moynihan , M. G. Egan and J.M. D. Murphy "Theoretical spectra of space vector modulated waveform",  IEE Proceedings, on Electr. Power. Appl. , vol. 145, no. 1, pp.17 -24 1998 2.   Abstract | Full Text: PDF (844KB) 3.   Y. Murai , T. Watanabe and H. Iwasaki "Waveform Distortion and Correction Circuit for PWM Inverters with Switching Lag-Times",  IEEE Trans. on Ind. Appl. , vol. IA-23, no. 5, pp.881 -886 1987 4.   Abstract | Full Text: PDF (1495KB) 5.   P. T. Manditeresa , J. Li and D.T. W. Liang "Comparisons of real time generated space vector modulated signals for motor drive applications",  IEE-Seventh international Conference on Power Electronics and Variable Speed Drives (Conf. Publ. No. 456) , pp.99 -104 1998 6.   Abstract | Full Text: PDF (508KB) 7.   B. K. Bose  Power Electronics and Variable Frequency Drives , 1997 :IEEE Press 8.    N. Mohan , T. M. Undeland and W. P. Robbins  Power Electronics: Converters,  Applications and Design , 1996 :John Wiley & Sons 9.   S. G. Jeong and M. H. Park "The analysis and compensation of dead-time effects in PWM inverters",  IEEE Transactions on Industrial Electronics , vol. 38, no. 2, pp.108 -114 1991 10.   Abstract | Full Text: PDF (880KB) 11.   J. S. Choi , J. Y. Yoo , S. W. Lim and Y. S. Kim "A novel dead time minimization algorithm of the PWM inverter", Conf. Record of the 1999 IEEE Industry Applications Conference , vol. 4, pp.2188 -2193 1999 12.   Abstract | Full Text: PDF (424KB) 13.   C. Attaianese , A. Perfetto and G. Tomasso "Dead time compensation in VSI feeding induction motors with space vector modulation",  Proceedings of  ELECTRIMACS\'99. , vol. 1, pp.181 -186 14.   R. D. Klug "Effects and Correction of Switching Dead-Times in 3-phase PWM Inverter Drives",  Proceedings of EPE\'89 , pp.1261 -1266      Electric Drives/AC drives Description The high-level schematic shown below is built from six main blocks. The induction motor, the three-phase inverter, and the three-phase diode rectifier models are provided with the SimPowerSystems™ library. More details are available in the reference pages for these blocks. The speed controller, the braking chopper, and the space vector modulator models are specific to the drive library. It is possible to use a simplified version of the drive containing an average-value model of the inverter for faster simulation. Note  In SimPowerSystems software, the Space Vector PWM VSI Induction Motor Drive block is commonly called the AC2  motor drive.  High-Level Schematic Simulink Schematic  Speed Controller The speed controller is based on a PI regulator that controls the motor slip. As shown in the following figure, the slip value computed by the PI regulator is added to the motor speed in order to produce the demanded inverter frequency. The latter frequency is also used to generate the demanded inverter voltage in order to maintain the motor V/F ratio constant. Space Vector Modulator The space vector modulator (SVM) contains seven blocks, shown in the following figure. These  blocks are described below.   The three-phase generator   is used to produce three sine waves with variable frequency and amplitude. The three signals are out of phase with each other by 120 degrees. The inverter demanded frequency and voltage are two of the block inputs. The low-pass bus filter   is used to remove fast transients from the DC bus voltage measurement. This measure is used to compute the voltage vector applied to the motor. The alpha beta transformation  converts variables from the three-phase system to the two-phase αβ system.   The αβ vector sector    is used to find the sector of the αβ plane in  which the voltage vector lies. The αβ plane is divided into six different sectors spaced by 60 degrees.  The ramp generator   is used to produce a unitary ramp at the PWM switching frequency. This ramp is used as a time base for the switching sequence. The  switching time calculator   is used to calculate the timing of the voltage vector applied to the motor. The block input is the sector in which the voltage vector lies. The  gates logic  receives the timing sequence from the  switching time calculator   and the ramp from the ramp generator  . This block compares the ramp and the gate timing signals to activate the inverter switches at the proper time.
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