Control system for a current source converter supplying an AC bu

Details Control system for a current source converter supplying an AC bu Control system for a current source converter supplying an AC bu

1990-08-14

1991-08-20

Beha, Jr., William H.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 14, 363 96, 323207, 307 46, 307 48, 307 87, H02M 7757

Patent

active

050419595

ABSTRACT:
An electrical power converter including both DC and AC power terminals which are respectively connected to a DC current source and an AC voltage source, the latter comprising the grid of an AC power utility. A capacitor is coupled to the AC terminals along with a load. A control and gating circuit is coupled to the converter for supplying control signals for the thyristors of a converter bridge included in the polyphase converter. When disconnected from the utility grid, a relatively fast acting control loop is coupled to the control and gating circuit and is responsive to the current flowing in the capacitor and an AC reference voltage to accommodate the current source characteristics of the converter for maintaining an output voltage of substantially constant amplitude across the AC terminals. A second and relatively slower acting control loop is also coupled to the control and gating circuit via the fast acting control loop and is responsive to the AC voltage across the capacitor and the load for providing regulation of the voltage across the AC terminals during steady state operation.

REFERENCES:
patent: 4417194 (1983-11-01), Curtiss et al.
patent: 4695932 (1987-09-01), Higashino
IEEE Article "A New PWM Control System for Ups Using Hysteresis Comparator" by Carpita et al., Conference Record of the 1987 IEEE Industry Applications Society Annual Meeting, Part I, Oct. 18-23, 1987.

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