| 摘要 |
An analog angle signal a, which is synchronised to a linked voltage circuit uRS, is formed by means of a phase regulator in order to address function memories in order to form digital angle function values. A DC voltage regulator supplies the required value for the amplitude of the system of alternating currents which is to be taken from the AC voltage network. By multiplying the digital angle function values by the required amplitude, digital/analog converters provide a system of required phase-current values, which system is compared with corresponding actual current values. The comparison results can either be fed into two-point regulators having a finite hysteresis width or are converted via current regulators into a system of required voltage values having no zero, which required voltage values are pulse-width-modulated by means of hysteresis-free two-point regulators and a relatively high frequency keying voltage. The output signals from the two-point regulators supply the drive signals of the valves of the converter. <IMAGE>
|
