ABSTRACT
This paper
describes an improved Flexible Alternating Current Transmission System
(FACTS)-based custom power controller with dynamic voltage restorer (DVR),
static compensator (STATCOM) and unified power quality conditioner (UPQC)
topology. The proposed controller can feed the power to grid and proficiently
moderate the power quality problems like sag, swell, flicker, voltage
interruption, reactive and active power compensation and voltage disturbances
with harmonic problems to make sure power quality in the distribution system.
The proposed configuration utilizes the Distributed generations (DGs), e.g.
Photovoltaic (PV), wind and proton exchange membrane fuel cell stack connected
to the micro-grid for realilazisation of DVR, STATCOM and UPQC operation with
reduced filtering requirements. Space vector pulse width modulation -based
hybrid cascade bottom leg multilevel inverter has been used for this purpose.
The proposed topology has been simulated using MATLAB/Simulink and validated
experimentally on a practical system. It is shown that the UPQC performs
significantly better than the DVR and STATCOM for the improvement of different
power quality issues.
KEYWORDS
1. Hybrid
cascade bottom leg multilevel inverter
2. Dynamic
voltage restorer
3. Static
compensator
4. Unified
power quality conditioner
5. Space
vector pulse width modulation
6. Proton
exchange membrane fuel cell stack
7. Power
quality
SOFTWARE: MATLAB/SIMULINK
CONCLUSION
This paper
investigates the combined renewable sources of PV-wind-PEMFCS-DVR,
PV-wind-PEMFCSSTATCOM and PV-wind-PEMFCS-UPQC system for the purpose of
simultaneous compensation and active power injection. This proposed method is
capable to compensate network power quality issues and mitigate their effects
on sensitive loads in distribution power systems. The simulation and hardware
outcomes specify the capability of custom power device in mitigating the
voltage variation and harmonic polluting loads. The output voltage harmonics is
reduced by SVPWM switching for the operation of DVR, STATCOM or UPQC modes. The
proposed system also decreases the overall voltage THD in the micro-grid, decreases
the total system loss, improves the dc link voltage, increases the effecting
speed, solves the loss of commutation, minimizes the harmonics and optimizes
the highfrequency switching problems. The proposed method is simple and can be
easily implemented with the help of already available drive compatible
hardware.
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