Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1991-07-09
1992-11-10
Stephan, Steven L.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
307105, 307520, 307543, 333167, H02M 112
Patent
active
051629836
ABSTRACT:
An active filter suppresses harmonic current components flowing through a power supply, to which a compensation object load including a harmonic component source and a capacitive load is coupled. The active filter supplies a compensation current Ic in accordance with an output of a subtracter coupled to current transformers for detecting the load current I1 and the capacitive load current If, respectively. Thus, the compensation current Ic supplied from the active filter corresponds to and compensates only for the harmonic current components generated by the harmonic component source. The capacitive load current If is excluded from control operation. Thus, the positive feedback of the system is avoided, and stable control operation can be obtained.
REFERENCES:
patent: 4692855 (1987-09-01), Kuroiwa
patent: 4812669 (1989-03-01), Takeda
patent: 5012400 (1991-04-01), Yasuda
M. Takeda et al., "Harmonic Current Compensation with Active Filter," IEEE, 1987, pp. 809-815.
Mitsubishi Denki Giho (Mitsubishi Electric Corporation's Technical Journal) vol. 62, No. 6, 1988, pp. 15-20.
Berhane Adolf
Mitsubishi Denki & Kabushiki Kaisha
Stephan Steven L.
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