This paper proposes a novel convertible unified
power quality conditioner (CUPQC) by employing three voltage source converters
(VSCs) which are connected to a multi-bus/multifeeder distribution system to
mitigate current and voltage imperfections. The control performance of the VSCs
is characterized by a minimum of six circuit open/close switches configurable
in a minimum of seventeen combinations to enable the CUPQC to operate as shunt
and series active power filters (APFs), unified power quality conditioner
(UPQC), interline UPQC (IUPQC), multi-converter UPQC (MC-UPQC) and generalized
UPQC (GUPQC). The simulation and compensation performance analysis of CUPQC are
based on PSCAD/EMTDC.
SOFTWARE: MATLAB/SIMULINK
Fig.1
Schematic representation of proposed CUPQC
EXPECTED SIMULATION RESULTS
Fig.2.
Feeder1 (a) Load current (b) Source voltage
Fig.3.
Feeder1 (a) Compensation currents (b) Compensation voltages
Fig.4.
Feeder1 (a) Source currents (b) Load voltages
Fig.5.
Feeder1 THD spectrum (a) Currents (b) Voltages
Fig.6.
Feeder3 source voltage
Fig.7.
Feeder3 compensation voltage
Fig.8.
Feeder3 load voltages
Fig.9.
Feeder3 voltage THD before and after compensation
Fig.10.
(a) Feeder1source voltage (b) Feeder2 source voltage (c) Feeder3 load
current
Fig.11.
(a) Feeder1 compensation voltages (b) Feeder2 compensation
voltages(c)
Feeder3 compensation currents
Fig.12.
(a) Feeder1 load voltages (b) Feeder2 load voltages (c) Feeder3 source
Currents
Fig.13.
THD before and after compensation (a) Feeder1 voltage (b) Feeder2
voltage
(c) Feeder3 current
Fig.14.
RMS voltage (a) Feeder1 (b) Feeder2
CONCLUSION
In
this paper the performance of the proposed CUPQC in three modes of operation as
UPQC, MC-UPQC and GUPQC on a multi-bus/multi-feeder distribution system is
validated by simulation results. The operating modes of the novel power quality
conditioner in 17 different modes for compensation of currents and voltage
interruptions are clearly explained. As an extension to this analysis, the
authors are working on a model for characterization and testing of the proposed
CUPQC.
.
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