Title page for etd-0805117-154152


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URN etd-0805117-154152
Author Shang-hung Hu
Author's Email Address No Public.
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Department Electrical Engineering
Year 2016
Semester 2
Degree Ph.D.
Type of Document
Language English
Title Design of virtual inductance for drooped-controlled inverter in microgrid
Date of Defense 2017-07-27
Page Count 112
Keyword
  • linear time-variant
  • grid connection
  • islanding
  • non-synchronous
  • microgrid
  • droop control
  • virtual inductance
  • Abstract This paper presents a design of virtual inductance for droop-controlled inverter in microgrid. This droop-controlled inverter can regulate voltage magnitude and frequency when microgrid is operated in islanded mode. Moreover, by applying the virtual inductance, microgrid is able to connect to grid without pre-synchronization. The virtual inductance is designed with a large initial value that will dynamically decrease over time. After a specific time period, the virtual inductance reaches steady state and is fixed at a final value. Because the dynamic virtual inductance is time-varying, Laplace transform operation is not suitable for analysis. Instead, state-space model and small-signal analysis is preferred to conduct the system model and determine the system stability. The system model includes the droop control, the voltage control, the output filter, the output line impedance and the dynamic virtual inductance. The design consideration of the virtual inductance will be explained specifically; the corresponding design criterion of initial value, final value and time constant will be described in detail, too. Time-domain simulation with respect to a simplified microgrid was built to verify that non-synchronous grid-connected operation can be achieved by using the well-design virtual inductance. Furthermore, a laboratory prototype with a droop-controlled inverter was set up to compare the performance between different types of virtual impedance.
    Advisory Committee
  • Chih-Chiang Hua - chair
  • Shiang-Hwua Yu - co-chair
  • Hurng-Liahng Jou - co-chair
  • Jau-Woei Perng - co-chair
  • Whei-Min Lin - co-chair
  • Yao-Ching Hsieh - co-chair
  • Jen-Hao Teng - co-chair
  • Tzung-Lin Lee - advisor
  • Files
  • etd-0805117-154152.pdf
  • Indicate in-campus at 3 year and off-campus access at 3 year.
    Date of Submission 2017-09-05

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