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      • HARVEST
      • Electronic Theses and Dissertations
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      DYNAMIC ENHANCEMENT OF THE FUTURE SASKPOWER INTERCONNECTED NORTH AND SOUTH SYSTEMS: THE HVDC INTERCONNECTION

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      PHAM-THESIS.pdf (5.162Mb)
      Date
      2014-05-01
      Author
      pham, linh
      Type
      Thesis
      Degree Level
      Masters
      Metadata
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      Abstract
      SaskPower has two separate systems, namely the North and the South systems. The South system contains SaskPower major generation and system load. The North system load is located relatively far from its generation (200 to 300 km). The North system is considered, therefore, to be electrically weaker than the South system. Recently there has been an interest in connecting the two systems to improve the security, stability and reliability of the integrated system. Grid interconnections, however, especially between weak and strong systems, often result in the arising of low-frequency oscillations between the newly connected areas. These oscillations that are termed “inter-area oscillations” exhibit, generally poor damping and can severely restrict system operations by requiring the curtailment of electric power transfers level as an operational measure. There are two options for SaskPower North and South systems interconnection, namely HVAC and HVDC interconnections (tie-lines). This thesis reports the results of digital time-domain simulation studies that are carried out to investigate the dynamic performance of a proposed 260 km, ± 110 kV, 50 MW Voltage-Sourced Converter HVDC tie-line that would connect SaskPower North and South systems. The potential problems that might arise due to such an interconnection, namely power flow control and low-frequency oscillations are studied and quantified and a proposed feasible solution is presented. In this context, the effectiveness of the HVDC and a Power Oscillations Damping (POD) controller in damping power system oscillations in the tie-line is investigated. Time-domain simulations are conducted on the benchmark model using the ElectroMagnetic Transients program (EMTP-RV). The results of the investigations have demonstrated that the presented HVDC link and its POD controller are effective in mitigating the low-frequency oscillations between the North and South systems at different system contingencies and operating conditions.
      Degree
      Master of Science (M.Sc.)
      Department
      Electrical and Computer Engineering
      Program
      Electrical Engineering
      Supervisor
      Farried, Sherif; Dinh, Anh
      Committee
      Karki, Rajesh; Li, Chen; Deters, Ralph
      Copyright Date
      April 2014
      URI
      http://hdl.handle.net/10388/ETD-2014-04-1498
      Subject
      HVDC INTERCONNECTION
      DYNAMIC STUDY
      VSC
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