Static converter for HVDC power transmission

Details Static converter for HVDC power transmission Static converter for HVDC power transmission

1984-10-09

1986-01-07

Wong, Peter S.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363 51, H02J 336

Patent

active

045637326

ABSTRACT:
A static convertor for power transmission by means of high-voltage direct current has a current regulator which influences the control angle of the convertor in dependence on the deviation between a current order supplied to the convertor and the present direct current of the convertor. The current regulator has a proportional part and an integrating part. The output signal of the integrating part is limited in the upward direction to a value corresponding to a maximum value of the control angle of the convertor. The output signals from the integrating and proportional parts are added to form the output signal of the current regulator. The limiting value of the integrating part is calculated by a calculating circuit as a function of the current order and the ideal direct voltage of the convertor. The calculation is made by determining the control angle at which, at a load current equal to the current order, the extinction angle becomes equal to the smallest permissible turn-off angle. From this angle there is then subtracted the output of the proportional unit at a current equal to the current order, and the result constitutes the limiting value of the integrating part.

REFERENCES:
Erich Uhlmann, Power Transmission by Direct Current, 1975, pp. 132-133.

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