Parallel connection of different types of AC power supplies of d

Details Parallel connection of different types of AC power supplies of d Parallel connection of different types of AC power supplies of d

1994-12-28

1995-12-05

Sterrett, Jeffrey L.

Electric power conversion systems

Current conversion

Having plural converters for single conversion

307 66, H02M 75395

Patent

active

054735289

ABSTRACT:
A power inverting method and system for connecting a plurality of AC power supplies to a common bus line in parallel wherein the AC power supplies are independently controlled so that power supplies with different rating characteristics can be coupled to the common bus line without adverse effects such as the existence of cross currents flowing between the different power supplies. In each AC power supply there is provided a system parameter calculating unit for calculating optimum load current, system impedance and output voltage parameters of the power supply which are then output to a reference data producing unit which generates appropriate feedback voltage and phase signals for output to a voltage controller and a phase synchronization controller, respectively. The voltage controller and phase synchronization controller output feedback signals to a power inverter which varies the power supply output. Using such feedback control in each of the plurality of power supply units enables a constant current to be output to a load on the system and eliminates the possibility of cross currents between the various power supply units.

REFERENCES:
patent: 4677535 (1987-06-01), Kawabata et al.
patent: 4733341 (1988-03-01), Miyazawa
patent: 5212630 (1993-05-01), Yamamoto et al.

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