Title:
CIRCUIT AND METHOD OF COMPENSATING AND SYMMETRIZING REACTIVE CURRENT RAPIDLY VARYING IN LOAD CONNECTED TO THREEEPHASE NETWORK
Document Type and Number:
Japanese Patent JPS5343861
Kind Code:
A
Abstract:
Circuit for controlling reactive currents of a three-phase network, having three converters with forced commutation connected in parallel with the loads of the three-phase network, at least one energy accumulator connected to the d-c side of the converter, and a closed control loop having measuring transformers for input currents of the converter, for the load currents and for the conductor voltages of the network, means for evaluating required compensation currents and means for controlling firing pulse formers for the converters to adjust the waveform of the currents on the three-phase side, including capacitors shunted across the loads in three phases, the compensation control element being a three-phase four-quadrant control element, the energy accumulator being an additional capacitor and a resonant circuit tuned to twice the network frequency, the resonant circuit being connected in parallel to the additional capacitor, the control loop including means for controlling the mean voltage on the d-c side of the four-quadrant control device, a conductance measuring converter connected to the measuring transformers for the load currents and an active-current reference-value generator connected to the conductance measuring converter.
Inventors:
MANFUREETO DEEPENBUROTSUKU
Application Number:
JP8209877A
Publication Date:
April 20, 1978
Filing Date:
July 11, 1977
Export Citation:
Assignee:
BBC BROWN BOVERI & CIE
International Classes:
G05F1/70; H02J3/18; H02J3/26; H02M7/00; (IPC1-7): G05F1/68; H02J3/14; H02J3/18