A New Three-Phase Parallel Active Power Filter with Outages and PCC Voltage Compensation

A New Three-Phase Parallel Active Power Filter
with Outages and PCC Voltage Compensation
by
WOO-CHEOL, LEE
Under the supervision of
Prof. DONG-SEOK HYUN, Ph.D.
Dept. of Electrical Engineering
The Graduate School of Hangyang University
This paper is a research on a new three-phase parallel active
power filter with outages and PCC voltage compensation under the
utility problems caused by the proliferation of non-linear loads such
as harmonics, increment of reactive power, voltage variation, and
blackouts. For these purposes, this paper presents (i) the optimal
design of parallel active power filter (ii) the modified PWM
modulation strategy which can operate the power conversion
system by using the single current sensor (iii) the detection method
of negative sequence and control scheme under the unbalanced load
condition (iv) the control method of constant PCC voltage (v) UPS
control method caused by blackouts in typical distribution systems
and the relations of each scheme.
 In a design method of the parallel active filter, an analytic model
on active filter is proposed. For this purpose, control circuit, power
 circuit, IGBT drive, and design method of the passive filter are
proposed. In a modified PWM modulation strategy, a technique for
reconstructing converter line currents using the information from a
single current sensor in the DC-link of a converter and comparative
evaluation of the performance of single sensor control techniques in
the DC-link for voltage-source PWM converters is presented. And
when 3f input currents cannot be reconstructed, three methods to
acquire the DC-link current are also proposed.
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