Vector Control of Three-Phase AC Machines: System by Nguyen Phung Quang Dr., Jörg-Andreas Dittrich Dr. (auth.)

By Nguyen Phung Quang Dr., Jörg-Andreas Dittrich Dr. (auth.)

This monograph covers the realm of vector regulate of three-phase AC machines, specifically induction automobiles with squirrel-cage rotor (IM), everlasting excited synchronous vehicles (PMSM) and doubly-fed induction machines (DFIM), from the perspective of the sensible layout and improvement. major concentration is at the software of the IM and the PMSM in electric force platforms, the place the strategy of the field-orientated keep an eye on has been effectively confirmed within the perform, and at the use of the grid voltage oriented managed DFIM within the wind strength plants.

The monograph is appropriate for the sensible paintings. improvement engineers and architects of force and of the wind strength expertise are frequently pointed out with the ebook. it may be instructed for certified staff from the examine and for students.

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Extra info for Vector Control of Three-Phase AC Machines: System Development in the Practice

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If the switching states of the above table are now written in reversed order 000 / 001 / 011 / 111 / 011 / 001, a so-called control word (CW) results with CW=17D9h as a hexadecimal number. 4. 4 Control words of all sectors Sectors Control words S1 17D9h S2 27DAh S3 2DF2h S4 4DF4h S5 4BECh S6 1BE9h Fig. 14b Modulation time frame of the solution without additional hardware The control word, corresponding to the determined sector is loaded by the interrupt routine from the memory into the accumulator, submitted to the latch, shifted three times to the right (to remove the switching state), and then stored back into the RAM.

Every (modulation and) pulse period Tp contains the realization of two voltage vectors, the relation between the pulse frequency fp = 1/Tp and the sampling frequency 1/T is obtained. 3 is that two sampling periods T correspond to one pulse period Tp. However this relationship is rarely used in practice. In principle it holds Calculation and output of the switching times 23 that the new voltage vector us provided by the current controller is realized within at least one or several pulse periods Tp.

With the other sectors S2 - S6 the procedure will be much alike: splitting the voltage vector into its boundary components which are orientated in the directions of the two neighbouring standard vectors, every vector of any arbitrary position can be developed within the whole vector space. 3. The following pictures give a summary of switching pattern samples in the remaining sectors S2 ... S6 of the vector space. 22 Inverter control with space vector modulation Fig. 4 Pulse pattern of the voltage vectors in the sectors S2 ...

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