ABSTRACT:
Emergence
of solid-state switching devices, like thyristors, GTO’s, IGBT’s and etc, are
widely used for controlling electric power in power electronic equipment for
various purpose such as HVDC systems, computers etc. These devices draw
disturbance in voltages and currents of both source side and distribution ends
due to its non-linearity. This induce harmonics, reactive power, and excess
neutral current cause the system to have less efficiency and reduction in power
factor. In this paper transformer less single-phase unified power quality
conditioner has been implemented to reduce the voltage and current distortions.
The operation and control of single-phase transformer less three leg Unified
power quality conditioner is investigated with the implementation of a new
pulse width modulation method for solving the coupling problem introduced by
common leg switches.
KEYWORDS:
1. TL-UPQC
2. SVPWM
3. Harmonics
4. Total
harmonic distortion
5. DSTACOM
D DVR
SOFTWARE: MATLAB/SIMULINK
Fig. 1. Block Diagram for Harmonic Reduction Using UPQC.
EXPECTED SIMULATION RESULTS:
Fig. 2. DC- link Voltage Waveforms.
Fig. 3. Source Current Waveforms.
Fig. 4. % THD of Source Side Current.
The
custom power devices such as DVR helps in compensation of voltage unbalances
and DTATCOM helps in the elimination of current harmonics that are entering the
circuit due to the presence of a non-linear load at the consumer side. By using
a unified power quality conditioner both the issues such as compensation of
voltage unbalances and elimination of current harmonics can be minimized. The
replacement of the series transformer with a series inductance helps to
overcome the issues of cost and weight of the system. The working principle and
implementation of practical two-level space vector modulation has been shown.
The special switching sequence incorporated in space vector modulation tech technique
used here minimizes the coupling issues that occur in the common leg operation.
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