By Werner Leonhard; VDI/VDE-Gesellschaft Mess- und Regelungstechnik
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Extra info for Control in power electronics and electrical drives : proceedings of the second IFAC symposium, Düsseldorf, Federal Republic of Germany, 3-5 October 1977
1 1 a ) whi ch provi des anal og ga tes for deducing V ds and Vq s when V s i s con stant; the other ( fi g . 1 1 b ) whi ch a l l ows to ca� cul ate V ds and Vq s by way of analog mul ti pl i ers for the case of V s vari abl e i n ti me . The l ast s i tuati on i s useful for s tati c i nver ters suppl i ed by an i n termedi ate vari a b l e vol tage stage . Tha t ' s the case , for exampl e , of vari a b l e vol tage square wave operation . nE Q fi g . 1 1 The rea l i zed s i mul ation system may be adapted to more usua 1 i nverter--fed e 1 ectri cal machines and for i nves ti gati �g some other parti cul ar dri ve systems .
The same reference directions will be used for the voltages of the three-phase group as they are denoted for the currents. The shunt elements (the condensers and the stator winding of the motor) can't have zero sequence current. Therefore the zero sequence current component o( each semiconductor groups are i equal to � . In the more detailed figure b only the current conducting elements are indicated for one sixth of a period beginning with the firing of the thyristor TNC in phase in the negative side.
1 3. c. current has a given value. The border con ditions denoted in the figure are valid only for thyristor le bridge circuit, because in the diode bridge case the dis regarded diode forward voltages may result other con duction states. Fig. 1 5 . Commutation, C 0 The voltage equation of the three-phase side is 4. THE EFFECT OF SHUNT CAPACITORS ON THE COMMUTATION It will be investigated, although only qualitatively as an application example, how the shunt capacitors con nected to the three-phase terminals of a diode bridge converter (Fig.