Low-noise system for measuring frequency in multiphase power tra

Details Low-noise system for measuring frequency in multiphase power tra Low-noise system for measuring frequency in multiphase power tra

1984-01-17

1986-09-23

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

324 78R, 324 78D, 324 78S, G01R 2302

Patent

active

046138072

ABSTRACT:
A system for measuring frequency in a multiphase line system for the transmission of electrical power. The power balance of a multiphase electric transmission line is monitored by forming the stationary orthogonal components of a measured value system taken directly from the line. A control element which is derived from a controlled frequency variable forms AC variables having a frequency which is proportional to the controlled variable. The variables are conducted to a transformation circuit from which are derived the orthogonal components. The transformation circuit provides a quantity which determines the direction of a space vector, which quantity is provided as an actual value to a controller which is also responsive to a constant reference value. The output of the controller is conducted as a frequency-proportional controlled variable to the control element for forming the AC variables used in the transformation. Additionally, the controller output is conducted to an output line as the measured frequency variable. Analog and digital arrangements are described for performing the frequency measurement.

REFERENCES:
patent: 4028600 (1977-06-01), Blaschke
patent: 4475074 (1984-10-01), Reng

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