ABSTRACT:
The Power quality issues
like voltage variations and current variations presented in the electrical
networks are due to the consumer’s utilities. Which are non – linear in nature.
These non – linear loads inject increased flow of currents and reduced voltages
with distortions. These voltage and current variations cause adverse effect on
the consumer utilities. To overcome this problem we are using a modern Flexible
Alternating Current Transmission System controller i.e. distributed power flow
controller. This controller is also similar to any other series and shunt
controllers like UPFC. In the present controller i.e. in DPFC, the common Dc
link capacitor presented in UPFC is eliminated and three single phase converters
are used in place of three phase series converter. In this paper we have implemented
DPFC for a single machine connected to a three phase load under three phase
fault environment. Observed the voltage and current variation suppression in a
significant way. The control circuit is formulated using shunt currents and
series referral voltages. The entire system is designed and analyzed using MATLAB/SIMULINK.
KEYWORDS:
1. UPFC
2. DPFC
3. Decreased
Voltage
4. Increased
current
5. Power
Quality
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig. 1. Fundamental circuit of DPFC
EXPECTED SIMULATION RESULTS:
Fig. 2. Simulation results during three phase fault
condition.
Fig 3 Voltage drop mitigated during 0.1 to 0.12 sec
due to DPFC system
Fig. 4. Simulation results during fault (current
swell) condition.
Fig. 5. Simulation results for mitigation of current
swell between 0.1 to 0.12 sec using DPFC system.
Fig. 6. Simulation results for active and reactive
powers.
Fig. 7. THD of load voltage without DPFC
Fig. 8. THD of load voltage with DPFC (pi controller)
CONCLUSION:
In this paper we implemented a new concept for controlling
power quality problems by Distributed Power Flow Controller device. The
proposed concept of the DPFC approach is mathematically formulated and analyzed
for voltage and current variations and their mitigations for a three phase
source with linear load. The experimental results of DPFC shows the
effectiveness of DPFC in power quality enhancement as compared to all other
FACTS devices which are used for voltage drop mitigation process.
REFERENCES:
[1]
Y.-H. Song and A. Johns, ‘‘Flexible ac Transmission Systems (FACTS)’’, (IEE
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Engineers, 1999.
[2] N. G. Hingorani and L. Gyugyi, Understanding
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[3] L. Gyugyi, C. D. Schauder, S. L.Williams, T. R.
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