Article

Current control implementation with deadbeat algorithm for three-phase current-source active power filter

Dept. of Electr. & Electron. Eng., Yamaguchi Univ.
IEE Proceedings - Electric Power Applications (Impact Factor: 0.55). 08/2002; DOI: 10.1049/ip-epa:20020257
Source: IEEE Xplore

ABSTRACT An effective system control method is presented for applying a
three-phase current-source PWM convertor with a deadbeat controller to
active power filters (APFs). In the shunt-type configuration, the APF is
controlled such that the current drawn by the APF from the utility is
equal to the current harmonics and reactive current required for the
load. To attain the time-optimal response of the APF supply current, a
two-dimensional deadbeat control scheme is applied to APF current
control. To cancel both the delay in the two-dimensional deadbeat
control scheme and the delay in DSP control strategy, an adaptive line
enhancer (ALE) is introduced in order to predict the desired value of
three sampling periods ahead. The ALE also brings robustness to the
deadbeat control system. Owing to the ALE being in a transient state,
the settling time is short. By comparison in a steady state, the total
harmonic distortion ratio of source currents can be reduced as much as
possible compared to the case that ideal identification of a controlled
system could be made. The experimental results obtained from a DSP-based
APE are also reported. The compensating ability of this APF is very high
in accuracy and responsiveness, although the modulation frequency is
rather low

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