Voltage fluctuation and higher harmonics suppressor

Details Voltage fluctuation and higher harmonics suppressor Voltage fluctuation and higher harmonics suppressor

1990-12-05

1991-12-31

Stephan, Steven L.

Electricity: power supply or regulation systems

For reactive power control

Using converter

323205, G05F 170

Patent

active

050775170

ABSTRACT:
A device for suppressing voltage fluctuation and higher harmonics of a power system which supplies power to a load with large power fluctuation and higher harmonic current. The device includes a self-commutated converter and a higher harmonic filter, both provided in parallel with the load. The device includes a first calculation circuit which calculates a reactive power consumed by the load based on a load current and system voltage and generates a fundamental harmonic current command value to compensate the reactive power. The device further includes a second calculation circuit which detects a higher harmonic current flowing out to the power system based on a current flowing from the power system and generates a higher harmonic current command value to suppress the higher harmonic current. The device further includes an adder which adds the fundamental harmonic current command value and the higher harmonic current command value to generate a current command value of the self-commutated converter. The device includes a control circuit which receive the current command value for controlling the self-commutated converter.

REFERENCES:
patent: 3932799 (1976-01-01), Frank et al.
patent: 4009433 (1977-02-01), Moltgen
patent: 4019124 (1977-04-01), Moltgen
patent: 4719551 (1988-01-01), Nishizawa et al.
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patent: 4922124 (1990-05-01), Seki et al.
Akagi et al., "Generalized Theory of the Instantaneous Reactive Power and Its Applications", The Transactions of The Institute of Electrical Engineers of Japan, Jul. 1983, vol. 103-B, No. 7, pp. 483-490.

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