| 摘要 |
PURPOSE:To accomplish a higher speed and stable operation with less processing steps by selecting the optimal control angle from the table precalculated, based on the DC current and the AC voltage measured during the reversed conversion running of the A/D converter. CONSTITUTION:The A/D converters 3 and 3' adapted to convert the AC current to DC one and vice versa are controlled with the controlling devices 6 and 6' as given the operation command value from the central control unit 5. To calculate the control angle corresponding to the minimum surplus angle in the digitalization of this device, DC current Id is read into the computer for a level comparison to obtain the DC current Ii through a quantization. Likewise, AC voltage Ea is read in for level comparison to obtain the AC voltage Eg. Then, based on the DC current Ei and the AC voltage Ej, the control angle betaij is derived from the table precalculated to be processed. This simplifies the processing while reducing the processing steps, thereby assuring a digital controller of high speed and high reliable ility. |
