i think this ppt will help to u

1. A PROJECT ON
ENHANCEMENT OF POWER QUALITY IN
DISTRIBUTION SYSTEM USING D-
STATCOM

2. •Power Quality is a term used to broadly encompass the entire scope of
interaction among electrical suppliers, the environment, the system sand
products energized, and the users of those system sand products. It is more
than the delivery of "clean“ electric power that complies with industry
standards. It involves them a attainability of that power, the
design, selection, and the installation of every piece of hard ware and
software in the electrical energy system. Stretching from the generation plant
to the utility customer, power quality is a measure of how the elements affect
the system as a whole.
POWER QUALITY

3. POWER
QUALITY
THE COMMON POWER QUALITY
PROBLEMS
 voltage sags
 harmonic distortion
 low power factor

4. Voltage sags are one of the most occurring
power quality problems. For an industry voltage sags occur
more often and cause severe problems and economical losses.
Utilities often focus on disturbances from end-user equipment
as the main power quality problems
Total Harmonic Distortion, or THD is an amplifier
or pre-amplifier specification that compares the output
signal of the amplifier with the input signal and
measures the level differences in harmonic frequencies
between the two. The difference is called total harmonic
distortion

5. KEY WORDS
• D-STATCOM
• Methodology
• results and causes
• Conclusion

6. D-STATCOM
 VOLTAGE SOURCE CONVERTER
 CONTROLLER
 ENERGY STORAGE CIRCUIT
 LCL PASSSIVE FILTER

7. D-STATCOM
STATCOM is a managing system used on ac power indication system. It is
based on energy gadgets present resource inverter and can act as either a
resource or mess up of sensitive ac energy to power system.
If linked with a power resource. It can also provide effective ac energy. It is
participant of the FACTS family.
STATCOM is set up to back up power systems that have a bad energy
aspect and often inadequate present control.
Its most common use is for present balance

8. D-STATCOM

9. A voltage-source converter is a power electronic device
that connected in shunt or parallel to the system. It can generate a sinusoidal
voltage with any required magnitude, frequency and phase angle. The VSC
used to either completely replace the voltage or to inject the ‘missing
voltage’. The ‘missing voltage’ is the difference between the nominal
voltage and the actual.
Voltage Source Converter (VSC)
Suitable adjustment of the phase and magnitude of the
D-STATCOM output voltages allows effectives control of active and
reactive power exchanges between D-STATCOM and AC system. In
addition, the converter is normally based on some kind of energy
storage, which will supply the converter with a DC voltage

10. CONTROLLER

11. ENERGY STORAGE CIRCUIT
DC source is connected in parallel with the DC capacitor. It carries the
input ripple current of the converter and it is the main reactive energy
storage element. This DC capacitor could be charged by a battery source
or could be recharged by the converter itself.

12. LCL Passive Filter

13. METHODOLOGY
TEST SYSTEM
SIMULINK MODEL FOR THE TEST
SYSTEM

14. TEST SYSTEM
Single line diagram of the test system

15. SIMULINK MODEL OF THE TEST SYSTEM

16. CASES IN D-STATCOM
Without insertion of D-STATCOM
With insertion of D-STATCOM
D-STATCOM without LCL Passive Filter
D-STATCOM with LCL Passive Filter

17. Three phase to ground fault
Double line to ground fault
Single line to ground fault
Line to line fault
TYPES OF FAULTS IN THE D-
STATCOM

18. Without insertion of D-STATCOM
TPG DPG
a) voltage at load point is 0.6600 p.u b) voltage at load point is 0.7070 p.u

19. LL
C) voltage at load point is 0.7487 p.u
SLG
D) voltage at load point is 0.8259 p.u

20. With insertion of D-STATCOM
TPG
(a).voltage at load point is 0.9367 p.u
DLG
(b).voltage at load point is 0.9800 p.u

21. LL
c).voltage at load point is 1.068 p.u
LG
d).voltage at load point is 0.9837 p.u

22. D-STATCOM with out LCL filter
harmonic spectrum of distortion output current without LCL
Passive Filter

23. D-STATCOM WITH FILTER
harmonic spectrum of output current with LCL Passive Filter

24. CONCLUSION
The simulation results show that the voltage
sags can be mitigate by inserting D-STATCOM to the
distribution system. By adding LCL Passive filter to D-
STATCOM, The power factors also increase close to unity.
Thus, it can be concluded that by adding D-STATCOM
with LCL filter the power quality is
improved.

25. THANK YOU