ÇUKUROVA UNIVERSITY INSTITUTE OF NATURAL AND APPLIED ...

LIST OF FIGURES
PAGES
Figure 1.1. DVR structure (Vilathgamuwa et al, 2002) ............................................... 2
Figure 2.1. Basic disturbances: (a) Causes at customer side, (b) Causes
at utility side and (c) Affected equipment (Köroğlu,2012)..................... 7
Figure 2.2. Percentage occurrences of PQ disturbances in equipment
interruptions (Köroğlu,2012) .................................................................. 7
Figure 3.1. The Basic Structure of Dynamic Voltage Restorer (Vilathgamuwa et
al, 2002) ................................................................................................... 14
Figure 3.2. DVR connected in a medium voltage level power system ...................... 16
Figure 3.3. H-Bridge Inverter..................................................................................... 18
Figure 3.4. DVR with no energy storage and supply-side-connected rectifier .......... 20
Figure 3.5. DVR with no energy storage and load-side-connected rectifier .............. 20
Figure 3.6. Location of a DC-DC Converter in a DVR ............................................. 21
Figure 3.7. System-level requirements for DVR with ac/ac converter. ..................... 22
Figure 3.8. (a), (b) and (c) Equivalent circuit of system shown in Figure 3.1 ........... 26
Figure 3.9. Location of inverter-side and line-side filters in DVR ............................ 28
Figure 3.10. Inverter-side filter in DVR..................................................................... 29
Figure 3.11. Scheme of the protection mode ............................................................. 32
Figure 3.12. Scheme of the standby mode ................................................................. 32
Figure 3.13. Vector diagram of pre-sag compensation .............................................. 34
Figure 3.14. Vector diagram of in-phase compensation ............................................ 35
Figure 3.15. Phasor diagram of the phase advance compensation method ................ 36
Figure 3.16. Open Loop Control Method .................................................................. 37
Figure 3.17. Block diagram representation of DVR system with openloop
controller(Vilathgamuwa et al., 2002) .......................................... 38
Figure 3.18. Block diagram representation of DVR system with closed
loop controller(Vilathgamuwa et al., 2002). ......................................... 40
Figure 4.1. The proposed multilevel inverter based DVR structure with full
bridge DC-DC Converter ........................................................................ 45
Figure 4.2. Three-phase uncontrolled six pulse rectifier............................................ 46
Figure 4.3. Single phase symmetrical five level diode clamped inverter .................. 47
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