Series-parallel active power line conditioner utilizing temporar

Details Series-parallel active power line conditioner utilizing temporar Series-parallel active power line conditioner utilizing temporar

1993-08-19

1994-10-11

Voeltz, Emanuel T.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 71, 363 98, 323259, 323344, 323207, H02M 112, H02M 114

Patent

active

053552954

ABSTRACT:
A series-parallel active power line conditioner is provide having improved peak voltage regulation capability when compared with the prior art. The DC energy level in the DC link between the series and parallel inverters is temporarily increased when the AC input voltage is not within the linear regulation range of the active power line conditioner. To effect this energy boosting function, control circuitry first determines the amount by which the average value of the AC input voltage is without the linear regulation range of the active power line conditioner. This information is then utilized to control the parallel inverter such that the DC energy level in the link is proportionally increased. A preselected maximum DC energy level is preferably chosen such that excessive AC input voltage variations will not cause further increases in the DC energy level. In presently preferred embodiments, this maximum DC energy level is twice the level nominally maintained when the AC input voltages fall within the sinusoidal regulation range of the active power line conditioner.

REFERENCES:
patent: 3825814 (1974-07-01), Pelly
patent: 3825815 (1974-07-01), Gyugyi et al.
patent: 4241395 (1980-12-01), Stacey et al.
patent: 4651265 (1987-03-01), Stacey et al.

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