| 摘要 |
Disclosed herein is a high-voltage direct current converter control device for a direct current energy transmission line comprising an angle computer controlling a pulse generator. The direct current powerline is equipped at each of its ends with a bridge having control rectifier cells. The optimum cell ignition times are calculated considering the requirements of a power transmission program to be carried out and impulses are fed to the cells at instances calculated according to the techniques of the present invention. In accordance with this technique, from a first pulse train corresponding to the successive zero passage of voltage at the terminals of one of the cells of the converter is derived a second pulse train comprising six times as many pulses as the first pulse train, the pulses in the second pulse train being equally spaced over a time T defined as the time between the successive pulses in the first pulse train. The pulses in the second pulse train correspond to the theoretical times for the zero passages of the voltage at the terminals of the six cells of the converter bridge. The actual zero passage times are measured and numbers epsilon proportional to the interval of time separating the passage of theoretical zeros and the actual zeros at each of the cells are measured and the maximum value of epsilon is determined. Further, two numbers termed the rectifier stop and the inverter stop are determined on the basis of the maximum value of epsilon , the bridge regulation angle r, the maximum trespass angle of the cells u and the angle of the extinction of the cells gamma . On the basis of the rectifier stop, the inverter stop and the second pulse train, ignition impulses for the cells are developed.
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