M.Sc. Tezi Görüntüleme

Student: Pelin TÜRKMEN
Supervisor: Assoc. Prof. Dr. Emre ÖZKOP
Department: Elektrik-Elektronik Müh.
Institution: Graduate School of Natural and Applied Sciences
University: Karadeniz Technical University Turkey
Title of the Thesis: INVESTIGATION OF REACTIVE POWER GENERATION CAPABILITY OF H6-II TYPE TRANSFORMERLESS INVERTER WITH DIFFERENT MODULATION METHODS
Level: M.Sc.
Acceptance Date: 5/1/2022
Number of Pages: 61
Registration Number: i3963
Summary:

      In this study, an investigation of reactive power generation capability of a single

phase H6-II type transformerless inverter with modulation techniques, modulation signals

      (MS), carrier signal (CS) and modulation strategies (MStr) is made. Firstly, performances

of sinusoidal pulse width modulation (SPWM) and third harmonic injected pulse width

      modulation (THI-PWM) technique mods (Mod I-VI) created by conventional modulation

strategy and several modulation and carrier signals on standalone H6-II type inverter

      presented separately and comparative analysis is realized. After that, switching signals

generated by the means of the mods (Mod I-XVI) created by several modulation strategies

      (conventional, conventional-discrete, improved and improved-discrete) based on SPWM

and hybrid-PWM (HPWM), modulation and carrier signals are applied into switches of

      grid connected H6-II type inverter. For each mod, active and reactive power injection

capability of the inverter is investigated. Finally, common mode voltage (𝑉𝐶𝑀) and leakage

      current (𝑖𝑐𝑚) characteristics are examined with depending on mods constituted by taking

account of power injection (active or reactive), modulation technique (SPWM or HPWM),

      modulation strategy (MStr- 1-6), modulation signal (MS 1-2), carrier signal (CS 1-6) types.

For different parasitic capacitor (𝐶𝑓𝑣) values, behavior of the leakage currents (𝑖𝑐𝑚) is

      observed.