Question

A three-phase voltage source inverter with ideal devices operating in 180° conduction mode is feeding a balanced star-connected resistive load. The DC voltage input is $V_{dc}$. The peak of the fundamental component of the phase voltage is

• A. $\frac{V_{dc}}{\pi }$
• B. $\frac{V_{dc}}{\pi }$
• C. $\frac{V_{dc}}{\pi }$
• D. $\frac{{2V}_{dc}}{\pi }$

Answer 1

The correct option is D $\frac{{2V}_{dc}}{\pi }$

$3-\varphi VSI180{}^{\circ }mode:$

$V_{Rn}=\frac{6V_{dc}/3}{n\pi }\sin n\omega t$

$=\frac{2\times V_{dc}}{n\pi }\sin n\omega t$

$V_{R1}=\frac{2V_{dc}}{\pi }\sin \omega t$