| 摘要 |
The components of an actual-value vector, which are transformed by means of an angle signal phi <*> and a vector rotator 32a and are smoothed by filters 33', are allocated to a measurement value Uu (for example by means of a delay circuit 140). The component corresponding to the angular difference between the smoothed vector and phi <*> is compensated for by means of a phase controller 119, as a result of which phi <*> becomes synchronous to the measurement value, this tracking control acting like an inverse vector rotation. If a nominal phase difference formed from a nominal active current value J<*>w is added to the angular difference and an additional amplitude formed from a nominal reactive current value I<*>B is added to the amplitude of the smoothed vector (points 117', 117"), a nominal value can be formed from the voltage measurement value of a three-phase or alternating current system for controlling an actuator 5 which feeds into the system via a coupling network 115, 122. <IMAGE>
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