CONTROL SYSTEM FOR SUPPLY / RECOVERY OF ENERGY FROM A THREE-PHASE NETWORK INTO A CONVERTER WITH A VARIABLE VOLTAGE LINK

摘要

PCT No. PCT/DE98/00165 Sec. 371 Date Jul. 30, 1999 Sec. 102(e) Date Jul. 30, 1999 PCT Filed Jan. 20, 1998 PCT Pub. No. WO98/34335 PCT Pub. Date Aug. 6, 1998A control arrangement according to an example embodiment of the present invention by means of which it is not only possible to minimize the harmonic content when energy is fed into/recovered from the three-phase network into a variable voltage link, but which also allows corresponding switching losses to be minimized. Furthermore, the control arrangement is also robust with respect to failure of at least one network phase, and is robust with respect to phase fluctuations. This is achieved in that not only digital angular function values whose phases are correct but which are phase-shifted equidistantly with respect to one another are stored in one or more function memory elements, but also associated digital signals which represent respective mathematical signs of these angular function values. These digital mathematical sign signals are compared in a comparator stage with digital mathematical sign signals measured via a phase detector of the individual network phases and if these compared values fail to coincide with one another, an inhibit signal is generated, by means of which the drive pulses for the converter active devices in the converter can be inhibited.