Control device for active filter

Electrical transmission or interconnection systems – With harmonic filter or neutralizer

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Details

307 3, 323217, 363 41, H02M 112

Patent

active

049068601

ABSTRACT:
A control device for an active filter according to the present invention comprises a ROM circuit for producing output signals sin .theta. and cos .theta. from a phase signal generated from a PLL circuit, a first multiplier for multiplying a load current detection signal by the output signals sin .theta. and cos .theta., a sample-holding circuit for integrating the output signal of the first multiplier and holding the integrated value to produce peak values of valid current component and invalid current component for constituting the basic wave component of the load current, a second multiplier for multiplying the peak values by the output signals sin .theta. and cos .theta., and a PWM control circuit for PWM-controlling the input current of the active filter with a harmonic current signal obtained as the difference between a basic wave current signal of the load current during a period of next one period of the single-phase a.c. power source and the load current detection signal by utlizing as the basic wave current signal of the load current of the period of next one period of the single-phase a.c. power source the basic wave current signal obtained by combining the valid current component and the invalid current component of the basic wave component outputted from the second multiplier.

REFERENCES:
patent: 3531652 (1970-09-01), Aemmer et al.
patent: 3628057 (1971-12-01), Mueller
patent: 4053820 (1977-10-01), Peterson et al.
patent: 4647837 (1987-03-01), Stemmler
patent: 4757415 (1988-07-01), Smith et al.
patent: 4812669 (1989-03-01), Takeda et al.
patent: 4835411 (1989-05-01), Takeda et al.

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