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Single Phase to Ground Fault
Current in Three Phase Inverter with
Balanced and Unbalanced Load
Presented By
Jaydeep Satyaj...
Outline
Introduction
Technical Background of Inverters
Inverters Applications
Advantages and Disadvantages of Inverter...
Introduction
Inverter is an electronic device, which
converts direct current (DC) input to
alternating current (AC) outpu...
Technical Background of Inverter
Inverter technology was initially
found by Toshiba Corporation in
1980s, and the technol...
Technical Background of Inverter (Cont.)
Single Phase Inverter : this inverter
circuit consists of two transistors Q1
and...
Technical Background of Inverter (Cont.)
Three phase inverter: it is used
for energy processing of PV and
wind power.
A ...
Inverter Applications
Solar power
Fuel cell (FC) plants
Wind turbines and microturbines
Power-hydro
Variable-frequenc...
Advantages and Disadvantages of Inverters in
Solar Energy
String Inverters
Advantages
 Lower cost
 Easier to install an...
Advantages and Disadvantages of Inverters in
Solar Energy (Cont.)
Micro Inverter
Advantages
 All panels are independent,...
Inverters for Ground Fault Current in
Microgrid
What is the inverters for ground fault current in microgrid?
 Ground fau...
Inverters for Ground Fault Current in
Microgrid (Cont.)
Techniques used to control in single phase and three phase invert...
Inverters for Ground Fault Current in
Microgrid (Cont.)
A single phase ground to fault in the three phase inverter with
b...
Simulations & Results
Vi Binh Quang Le & Jaydeep Satyajit Sathe 134/19/2017
Our results have 3 partsPart 1
We observe the effects of a single phase fault in phase A (short
circuited to ground) for ...
Part 1(A) – Balanced load, Phase A fault
Iinv: Phase A, B, C load = 80 KVA
Vi Binh Quang Le & Jaydeep Satyajit Sathe 154/1...
Vinv:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 164/19/2017
Iload:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 174/19/2017
Vload:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 184/19/2017
Part 1(B) – Unbalanced load, Phase A Fault
Phase A load: 50 KVA, Phase B load = 20 KVA, Phase C load = 5 KVA
Iinv:
Vi Binh...
Vinv
Vi Binh Quang Le & Jaydeep Satyajit Sathe 204/19/2017
Iload:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 214/19/2017
Vload:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 224/19/2017
Part 1 Conclusion
The waveforms observed are as expected, and the main difference
between Part 1(A) and Part 1(B) is the b...
Part 2 – Changing Inverter Current Limits
For I limit = 110% = 293.2722 A, Balanced load
Iinv:
Vi Binh Quang Le & Jaydeep ...
I limit = 110% = 293.2722 A, Unbalanced load
Iinv:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 254/19/2017
I limit = 300% = 799.8334 A, Balanced load
Iinv:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 264/19/2017
I limit = 300% = 799.8334 A, Unbalanced load
Iinv:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 274/19/2017
I limit = 562% = 1500 A, Balanced load
Iinv:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 284/19/2017
I limit = 562% = 1500 A, Unbalanced load
Iinv:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 294/19/2017
Part 2 Conclusion
From Part 2, we observe that if phase A is shorted with the ground:
The Iinv for phase A remains almost...
Part 3 – Changing Rsc valuesRsc = 1% = 0.01
V inv:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 314/19/2017
I load
Vi Binh Quang Le & Jaydeep Satyajit Sathe 324/19/2017
V load:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 334/19/2017
Rsc = 7.5% = 0.075
V inv:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 344/19/2017
I load:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 354/19/2017
V load:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 364/19/2017
Rsc = 15% = 0.15
Vinv:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 374/19/2017
I load:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 384/19/2017
V load:
Vi Binh Quang Le & Jaydeep Satyajit Sathe 394/19/2017
Part 3 Conclusion
From Part 3, we observe that when Rsc is increased:
The V inv voltage for phase C increases, but that f...
Future Work
 Based on the simulation results, appropriate fault models and
protection systems for such microgrid will be ...
References
[1] Ali Keyhani, Mohammad N. Marwali, Min Dai, “ Integration of
Green and Renewable Energy in Electric Power Sy...
References (Cont.)
[5] Dr. Tomislav Bujanovic, “ELE 791 Control of Distributed
Generation,” Modeling of Power Converter, D...
4/19/2017 Vi Binh Quang Le & Jaydeep Satyajit Sathe 44
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Vi binh jaydeep_team_ele-791 control of distributed generation - team project

  1. 1. Single Phase to Ground Fault Current in Three Phase Inverter with Balanced and Unbalanced Load Presented By Jaydeep Satyajit Sathe & Vi Binh Quang Le ELE-791 Control of Distributed Generation Syracuse University April 19, 2017
  2. 2. Outline Introduction Technical Background of Inverters Inverters Applications Advantages and Disadvantages of Inverters Inverter for Current Ground Fault Simulation and Results Conclusions and Future Research References Vi Binh Quang Le & Jaydeep Satyajit Sathe 24/19/2017
  3. 3. Introduction Inverter is an electronic device, which converts direct current (DC) input to alternating current (AC) output and also known as DC-AC converter. Due to the problem of dependent on nonrenewable fossil fuels, a demand of a development of renewable energy (clean power) is significant. Thus, inverters are used as interface between power generators (wind, solar, hydro, etc.) and the distribution grid to maintain the stability, reliability, controllability, and efficiency of the grid. [1] Vi Binh Quang Le & Jaydeep Satyajit Sathe 34/19/2017
  4. 4. Technical Background of Inverter Inverter technology was initially found by Toshiba Corporation in 1980s, and the technology is still applied widely in industries, especially to the renewable energy filed. Basic structure of inverter device consists of multiple transistors as displayed in the figure on the side. Vi Binh Quang Le & Jaydeep Satyajit Sathe 44/19/2017
  5. 5. Technical Background of Inverter (Cont.) Single Phase Inverter : this inverter circuit consists of two transistors Q1 and Q2 and two diodes connected as on the diagram. Q1 and Q2 are in turn on and off to generate a voltage Vo = Vs/2 cross the load. This is also known as Half Bridge Inverter. [2] Application: H-bridge inverter is used to convert 12 Vdc into a 120 Vac square wave using a transformer with a 10:1 turns ratio [7] Vi Binh Quang Le & Jaydeep Satyajit Sathe 54/19/2017
  6. 6. Technical Background of Inverter (Cont.) Three phase inverter: it is used for energy processing of PV and wind power. A three-phase inverter has three legs, one for each phase. Each inverter leg operates as a single- phase inverter. Vi Binh Quang Le & Jaydeep Satyajit Sathe 64/19/2017
  7. 7. Inverter Applications Solar power Fuel cell (FC) plants Wind turbines and microturbines Power-hydro Variable-frequencies drives Uninterruptible power supplies Electronic ballasts and induction heater Storage devices as local energy sources Vi Binh Quang Le & Jaydeep Satyajit Sathe 74/19/2017
  8. 8. Advantages and Disadvantages of Inverters in Solar Energy String Inverters Advantages  Lower cost  Easier to install and maintain Disadvantages  Problem if one panel fail, the entire string fail  Difficult to fix  Occupy more space Vi Binh Quang Le & Jaydeep Satyajit Sathe 84/19/2017
  9. 9. Advantages and Disadvantages of Inverters in Solar Energy (Cont.) Micro Inverter Advantages  All panels are independent, failure of one panel will not impact other  Easy to fix and maintain  Occupy less space Disadvantages  High cost  Difficult to install and maintain Vi Binh Quang Le & Jaydeep Satyajit Sathe 94/19/2017
  10. 10. Inverters for Ground Fault Current in Microgrid What is the inverters for ground fault current in microgrid?  Ground fault current in microgrid is technically abnormal current. This could be one or all the currents in the single or three phase of the inverter in the distributed grid (also known as a short circuit).  In order to protect the components devices in the grid systems, inverters are required to limit their fault current capability. This is accomplished through reduction in the internal voltage during faults. [6] Possibility methods of controlling the ground fault current  Fault behavior of an inverter is determined by its control, which in turn is based on the inverter topology (three phase three wire, three phase four wire, single phase) and topology of the network to which the inverter is connected as balanced or unbalanced load). Vi Binh Quang Le & Jaydeep Satyajit Sathe 104/19/2017
  11. 11. Inverters for Ground Fault Current in Microgrid (Cont.) Techniques used to control in single phase and three phase inverters can be broadly divided into the following three categories [6]: • Control in synchronously rotating dq0 reference frame • Control in stationary frame • Control in natural reference frame Control in rotating reference frame is the most popular approach where measured output voltages and currents are transformed into their equivalent by rotating frame dq0 of reference [6]  In this presentation, observing the effects on the inverter output current due to a single phase to ground fault with balanced and unbalanced loads will be analyzed Vi Binh Quang Le & Jaydeep Satyajit Sathe 114/19/2017
  12. 12. Inverters for Ground Fault Current in Microgrid (Cont.) A single phase ground to fault in the three phase inverter with balanced load • In this stage, the inverter is implement with parameters described in the gain.m file (which was attached to the research report) A single phase ground to fault in the three phase inverter with unbalanced load. In this case, the parameters used in the simulation have been chosen as follows: • Current limit is set to 110% of the inverter peak current limit • Three unbalanced loads: o Phase A : 50 kVA o Phase B : 20 kVA o Phase C : 5 kVA Vi Binh Quang Le & Jaydeep Satyajit Sathe 124/19/2017
  13. 13. Simulations & Results Vi Binh Quang Le & Jaydeep Satyajit Sathe 134/19/2017
  14. 14. Our results have 3 partsPart 1 We observe the effects of a single phase fault in phase A (short circuited to ground) for two cases – with balanced load and with unbalanced load. Here we set inverter current limit to be constant at 300%, and Rsc (short-circuit resistance) to be constant at 1%. Part 2 We change the inverter current limit to 110%, 300% and 562% and observe the effects of the single phase fault on the inverter current. We do this for balanced and unbalanced loads. We set Rsc to be constant at 1%. Part 3 We change the values of Rsc to 1%, 7.5% and 15% and observe its effects on the inverter currents and voltages. We do this for balanced load, and we set current limit to be constant at 300%. Vi Binh Quang Le & Jaydeep Satyajit Sathe 144/19/2017
  15. 15. Part 1(A) – Balanced load, Phase A fault Iinv: Phase A, B, C load = 80 KVA Vi Binh Quang Le & Jaydeep Satyajit Sathe 154/19/2017
  16. 16. Vinv: Vi Binh Quang Le & Jaydeep Satyajit Sathe 164/19/2017
  17. 17. Iload: Vi Binh Quang Le & Jaydeep Satyajit Sathe 174/19/2017
  18. 18. Vload: Vi Binh Quang Le & Jaydeep Satyajit Sathe 184/19/2017
  19. 19. Part 1(B) – Unbalanced load, Phase A Fault Phase A load: 50 KVA, Phase B load = 20 KVA, Phase C load = 5 KVA Iinv: Vi Binh Quang Le & Jaydeep Satyajit Sathe 194/19/2017
  20. 20. Vinv Vi Binh Quang Le & Jaydeep Satyajit Sathe 204/19/2017
  21. 21. Iload: Vi Binh Quang Le & Jaydeep Satyajit Sathe 214/19/2017
  22. 22. Vload: Vi Binh Quang Le & Jaydeep Satyajit Sathe 224/19/2017
  23. 23. Part 1 Conclusion The waveforms observed are as expected, and the main difference between Part 1(A) and Part 1(B) is the balanced and unbalanced loads. In both cases, when phase A is shorted with the ground: The I inv current for phases B and C increases and reaches the inverter current limit, but that for phase A remains the same. The V inv voltage for phase C decreases, but that for phases A and C remains almost the same. The I load for phase A increases, but that for phases B and C remains the same.  The V load voltage for phase A decreases significantly, but that for phases B and C increases slightly. Vi Binh Quang Le & Jaydeep Satyajit Sathe 234/19/2017
  24. 24. Part 2 – Changing Inverter Current Limits For I limit = 110% = 293.2722 A, Balanced load Iinv: Vi Binh Quang Le & Jaydeep Satyajit Sathe 244/19/2017
  25. 25. I limit = 110% = 293.2722 A, Unbalanced load Iinv: Vi Binh Quang Le & Jaydeep Satyajit Sathe 254/19/2017
  26. 26. I limit = 300% = 799.8334 A, Balanced load Iinv: Vi Binh Quang Le & Jaydeep Satyajit Sathe 264/19/2017
  27. 27. I limit = 300% = 799.8334 A, Unbalanced load Iinv: Vi Binh Quang Le & Jaydeep Satyajit Sathe 274/19/2017
  28. 28. I limit = 562% = 1500 A, Balanced load Iinv: Vi Binh Quang Le & Jaydeep Satyajit Sathe 284/19/2017
  29. 29. I limit = 562% = 1500 A, Unbalanced load Iinv: Vi Binh Quang Le & Jaydeep Satyajit Sathe 294/19/2017
  30. 30. Part 2 Conclusion From Part 2, we observe that if phase A is shorted with the ground: The Iinv for phase A remains almost the same (except for the effect of harmonics), but the Iinv for phases B and C reach the inverter current limit. Vi Binh Quang Le & Jaydeep Satyajit Sathe 304/19/2017
  31. 31. Part 3 – Changing Rsc valuesRsc = 1% = 0.01 V inv: Vi Binh Quang Le & Jaydeep Satyajit Sathe 314/19/2017
  32. 32. I load Vi Binh Quang Le & Jaydeep Satyajit Sathe 324/19/2017
  33. 33. V load: Vi Binh Quang Le & Jaydeep Satyajit Sathe 334/19/2017
  34. 34. Rsc = 7.5% = 0.075 V inv: Vi Binh Quang Le & Jaydeep Satyajit Sathe 344/19/2017
  35. 35. I load: Vi Binh Quang Le & Jaydeep Satyajit Sathe 354/19/2017
  36. 36. V load: Vi Binh Quang Le & Jaydeep Satyajit Sathe 364/19/2017
  37. 37. Rsc = 15% = 0.15 Vinv: Vi Binh Quang Le & Jaydeep Satyajit Sathe 374/19/2017
  38. 38. I load: Vi Binh Quang Le & Jaydeep Satyajit Sathe 384/19/2017
  39. 39. V load: Vi Binh Quang Le & Jaydeep Satyajit Sathe 394/19/2017
  40. 40. Part 3 Conclusion From Part 3, we observe that when Rsc is increased: The V inv voltage for phase C increases, but that for phases A and C remains the same. The I load for phase A decreases, but that for phases B and C remains the same.  The V load voltage for phase A increases, but that for phases B and C remains the same. Vi Binh Quang Le & Jaydeep Satyajit Sathe 404/19/2017
  41. 41. Future Work  Based on the simulation results, appropriate fault models and protection systems for such microgrid will be developed and tested. Vi Binh Quang Le & Jaydeep Satyajit Sathe 414/19/2017
  42. 42. References [1] Ali Keyhani, Mohammad N. Marwali, Min Dai, “ Integration of Green and Renewable Energy in Electric Power Systems,” 2010 by John Wiley & Sons, Inc. pg 1-4 [2] Manoj Kumar Swami, “ Inverter,” www.slideshare.net [3] Eric Glover, Studen Member, IEEE, Chung-Ching Chang, Student Member, IEEE, Dimitry Gorinevsky*, Fellow, IEEE, and Sanjay Lall, Senior Member, IEEE, “Frequency Stability for Distribued Generation Connected through Grid-Tie Inverter,” IEEE International Conference on Power System Technology (POWERCON), 2012 [4] P. Bhanu Teja, “Advancements in Inverter Technology,” National Institute of Technology Calicut, www.slideshare.net Vi Binh Quang Le & Jaydeep Satyajit Sathe 424/19/2017
  43. 43. References (Cont.) [5] Dr. Tomislav Bujanovic, “ELE 791 Control of Distributed Generation,” Modeling of Power Converter, Department of Electrical Engineering and Computer Science, Syracuse University [6] S.P. Plkharel, Satish Ranade, “Modeling and Simulation of Three Phase Inverter for Fault Study of Microgrids,” Conference Paper, September 2012 [7] Jim Dunlop Solar, “Inverter,” Definitions and Terminology∙Types and Applications ∙ Functions and Features ∙ Selection and Sizing ∙Monitoring and Communications, 2012 [8] “History of Inverter Technology,” Mitsubishi, Heavy Industries, LTD. Vi Binh Quang Le & Jaydeep Satyajit Sathe 434/19/2017
  44. 44. 4/19/2017 Vi Binh Quang Le & Jaydeep Satyajit Sathe 44

Single Phase to Ground Fault Current in Three Phase Inverter with Balanced & Unbalanced Load

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