Method and apparatus for controlling the output voltage of an AC

Details Method and apparatus for controlling the output voltage of an AC Method and apparatus for controlling the output voltage of an AC

1992-06-12

1994-09-20

Stephan, Steven L.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 17, 363 98, 323205, 323212, H02M 5257

Patent

active

053495225

ABSTRACT:
An AC system having, for example, a voltage source, an inductance and a load has connected thereto an apparatus for controlling the phase and amplitude of the voltage of the system. The instantaneous current and voltage in the AC electrical system are measured and power measurements derived therefrom. The power measurements may be instantaneous real and imaginary power, instantaneous active and reactive power, or active and reactive power averaged over less than one cycle. The power measurements are then used to derive phase related control values, on the basis of which control signals are generated to a converter. The action of the converter in accordance with the control signals thus controls the amplitude and phase of the voltage. By use of power measurements, it is not necessary to measure the phase of the voltage of the AC system.

REFERENCES:
patent: 4529925 (1985-07-01), Tanaka et al.
patent: 5081570 (1992-01-01), Chibani et al.
patent: 5136494 (1992-08-01), Akagi et al.
patent: 5138247 (1992-08-01), Tanoue et al.
patent: 5187427 (1993-02-01), Erdman

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