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Title: Fuzzy logic based DC modulation controllers for improvement of AC-DC system stability
Researcher: Vani, M Uma
Guide(s): Rao, P V Ramana
Jaya Ram Kumar, S V
Keywords: Multi Machine System
High Voltage Direct Current Transmission
Power System Stability
DC Power Modulation
Upload Date: 3-Sep-2012
University: Jawaharlal Nehru Technological University
Completed Date: October, 2011
Abstract: With the increase in size and complexity of Power Systems, the problems associated with long distance AC bulk power transmission, like reactive power support, system stability etc have also increased. A search for more efficient mode of transmission has led to the development of DC transmission. An HVDC transmission link is highly controllable and hence its effective use depends on the appropriate utilization of this controllability to ensure desired performance of the power system. In this thesis, investigations are carried out on the improvement of power system stability by employing auxiliary controls for controlling HVDC power flow. AC/DC load flow using eliminated variable method is utilized in the transient stability analysis. Transient stability analysis is carried out on single machine infinite bus system and multi machine system, using different control signals derived from the AC system and employing different types of controllers. The best possible combination of the different control signals, which stabilizes the system, is found out and its effectiveness is verified. Apart from the conventional, fuzzy logic based variable gain controller is also developed to further improve the stability of the power system. A new fuzzy logic based DC modulation controller is also developed for a multi machine system taking the average error and its derivative as inputs. The stability performance of the power system with such fuzzy logic controller is presented.
Pagination: 189p.
Appears in Departments:Faculty of Electrical Engineering

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01_title.pdfAttached File113.79 kBAdobe PDFView/Open
02_declaration.pdf102.93 kBAdobe PDFView/Open
03_certificate.pdf83.23 kBAdobe PDFView/Open
04_acknowledgements.pdf86.35 kBAdobe PDFView/Open
05_abstract.pdf83.65 kBAdobe PDFView/Open
06_table of contents.pdf115.83 kBAdobe PDFView/Open
07_list of tables.pdf82.55 kBAdobe PDFView/Open
08_list of figures.pdf141.01 kBAdobe PDFView/Open
09_symbols.pdf97.07 kBAdobe PDFView/Open
10_chapter 1.pdf366.12 kBAdobe PDFView/Open
11_chapter 2.pdf1.44 MBAdobe PDFView/Open
12_chapter 3.pdf252.38 kBAdobe PDFView/Open
13_chapter 4.pdf283.11 kBAdobe PDFView/Open
14_chapter 5.pdf269.09 kBAdobe PDFView/Open
15_chapter 6.pdf197.77 kBAdobe PDFView/Open
16_chapter 7.pdf132.49 kBAdobe PDFView/Open
17_appendix.pdf197.28 kBAdobe PDFView/Open
18_references.pdf166.13 kBAdobe PDFView/Open

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