Apparatus and method for controlling an elevator power supply

Details Apparatus and method for controlling an elevator power supply Apparatus and method for controlling an elevator power supply

1998-05-21

2000-03-28

Berhane, Adolf Deneke

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363125, H02M 704

Patent

active

060439998

ABSTRACT:
A digital control in line angle coordinates for a regulated power input device in which the line angle (.epsilon.) is determined from measured line voltages (U1M, U2M) by means of a coordinate transformation of the rotary field, in Cartesian coordinates and subsequent arctan calculation (ATAN). From this, under circumstances of a heavily disturbed line angle (.epsilon.) the line frequency is computed. In this, under circumstances, the strongly varying frequency information is limited to a plausible band of variations before the frequency is filtered and a relatively smooth running line angle (.epsilon.) can be calculated therefrom. In order to avoid an erroneous integration, the calculated line angle integrator is set at every phase-zero-crossing to the corresponding angle value. With this line angle (.epsilon.), which is stable also in the case of line disturbances, the coordinate trnnsformations of the line alternating currents (I1M, I2M) into line angle direct currents (IMD, IMQ) is carried out, as well as the control direct current voltages (UMD.sub.-- REF, UMQ.sub.-- REF), into the pertaining control alternating voltage (U1R.sub.-- REF, U2R.sub.-- REF).

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