Operation of grid‐connected DFIG using SPWM‐ and THIPWM‐based diode‐clamped multilevel inverters. Issue 8 (20th February 2020)

• Record Type: Journal Article
• Authors: Hossam‐Eldin, Ahmed A.; Negm, Emtethal; Elgamal, Mohamed S.; AboRas, Kareem M.
• Is Part Of: IET generation, transmission & distribution. Volume 14:Issue 8(2020)
• Page Start: 1412
• Page End: 1419
• Publication Date: 2020-02-20
• Subjects: wind power plants -- invertors -- rotors -- harmonic distortion -- power generation control -- power markets -- wind power -- PWM invertors -- asynchronous generators -- power grids; grid‐connected DFIG -- SPWM -- THIPWM‐based diode‐clamped multilevel inverters -- diverse renewable energy -- power generation technologies -- solar energy -- higher voltage applications -- leading technology -- wind power market -- induction generator‐based wind energy conversion systems -- WECS -- variable speed -- back‐to‐back diode‐clamped multilevel inverter systems -- third harmonic injection pulse width modulation -- DFIG performance -- different wind speed -- normal operation condition -- DCMLI systems -- sinusoidal voltage -- reduced total harmonic distortion -- power quality -- THIPWM MLI -- common usage techniques -- operation wind -- output fundamental voltage -- active power flow -- wind speed change; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2019.0248
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : This paper proposes a WECS based on a back to back diode‐clamped multilevel inverter systems (DCMLI) fired comparatively by sinusoidal pulse width modulation (SPWM) and third harmonic injection pulse width modulation (THIPWM) techniques. DFIG performance is compared using these technologies for different wind speed under normal operation condition. The proposed approach shows that the DCMLI systems generate a nearly sinusoidal voltage with reduced total harmonic distortion (THD) thus upgrading the power quality of that produced by DFIG. As SPWM and THIPWM MLI are most common usage techniques in research, we applied them in the system to discuss a comparison of using those techniques to determine the number of levels that achieve the IEEE 519 criteria of THD which is less than 5% for both techniques (5th level for SPWM and 4th level for THIPWM) in all operation wind speed. Compared with simple PWM, and THIPWM have many advantages as lower THD, minimal number of switching to decrease switching losses and the output fundamental voltage is increased. Lastly, the paper investigates the variation of the frequency of induced rotor voltage and the active power flow due to the wind speed change when the rotor speed changes from super‐synchronous to sub‐synchronous speeds.