Constant voltage constant frequency inverter and method for cont

Details Constant voltage constant frequency inverter and method for cont Constant voltage constant frequency inverter and method for cont

1993-01-05

1994-07-05

Stephan, Steven L.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 35, H02M 324

Patent

active

053273362

ABSTRACT:
A CVCF (Constant Voltage Constant Frequency) inverter includes a main circuit, a voltage control loop, and a frequency control loop. In a normal operating mode, constant voltage, constant frequency control is carried out by these loops. In a lap switching operation, if a comparator detects that the output current of the inverter exceeds a predetermined level, a switch is closed so that the effective power component computed by an effective power computing unit is inputted to the frequency control loop. The output frequency of the inverter is controlled by changing a reference frequency in response to the effective power. This reduces the phase difference between the output voltage of the inverter and an external power supply, thus decreasing a cross current. This makes it possible to protect the components of the inverter and to supply power reliably.

REFERENCES:
patent: 4488200 (1984-12-01), Matsuzaki
patent: 4677535 (1987-06-01), Kawabata et al.
patent: 4816981 (1989-03-01), Nishihiro et al.
patent: 5121315 (1992-07-01), Moriya
Takao Kawabata, "Parallel Operation of Voltage Source Inverters," IEEE Transactions on Industry Applications, vol. 24, No. 2 (Mar./Apr., 1988), pp. 281-287.

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