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Werner Leonhard; VDI/VDE-Gesellschaft Mess- und's Control in power electronics and electrical drives : PDF

By Werner Leonhard; VDI/VDE-Gesellschaft Mess- und Regelungstechnik

ISBN-10: 0080220142

ISBN-13: 9780080220147

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Read or Download Control in power electronics and electrical drives : proceedings of the second IFAC symposium, Düsseldorf, Federal Republic of Germany, 3-5 October 1977 PDF

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Additional resources for Control in power electronics and electrical drives : proceedings of the second IFAC symposium, Düsseldorf, Federal Republic of Germany, 3-5 October 1977

Example text

Such voltages are u2 and u3 in Fig. 1 8. Let us suppose that among the elements of state­ vector x x 1 and x 2 are the stator current compo­ nents of T, t = ix + ji x 1 + jx2 ; x3 = uNy is the y y-component of the condenser voltage in the negative side, other elements are the rotor quantities (fluxes or currents), speed of rotation, control variables etc. The stator voltage vector ii is to be expressed by this varia­ bles. = Using TNC (Fig. 1 8b) as reference point of the three­ phase voltage system ii we obtain u0 = ud , u c = u3, ub = u2 + V3x 3 and with ii = ux + juy according to the definition of Park-vectors 2ud Fig.

It i s a l so evi dent the presence of an a l ternati ve current component hav i ng fundamenta l frequency, whi c h shou l d b e absen t ; that i s dependi ng o n a d . c . component i n the i nput motor vo l ta ge s . The s i tuation of fi g . 2 1 represents the m o ­ tor sync hroni sm l os s i n consequence o f the s udden overl oad appl i ca t i on s . Tran s i ent worki ng condi tions . I n the fi g ures f 19, 20, 21 the evolution s a re reported of s o ­ me quant i t i e s i n consequence of a s udden l oad vari ati on .

Diode a is conducting diodes the voltage restrictions are: uc < 0. a u0 = ub < 0, 0, (In the case of thyristors opposite signs are necessary to be able to turn them on in the following conduction pattern). It turns out from the definition that the zero sequence component of the currents id . =3 10 can have only positive values, while that of the voltage u0 < Fig. 3. Stator current of an induction motor fed by voltage source inverter In steady-state the Park-vector time functions may be resolved in Fourier-series v= l(t) = Z 7v e jvw 1 t I + gk, k 0, ± I , ± 2, .

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Control in power electronics and electrical drives : proceedings of the second IFAC symposium, Düsseldorf, Federal Republic of Germany, 3-5 October 1977 by Werner Leonhard; VDI/VDE-Gesellschaft Mess- und Regelungstechnik


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