A three-phase voltage-source inverter with ideal devices operates in 180° conduction mode into a balanced star-connected resistive load. For DC input $V_{dc}$, the peak fundamental phase voltage is
Each inverter leg's pole voltage relative to the DC midpoint is a square wave of amplitude Vdc/2. Its fundamental sine coefficient is $4(V_{dc}/2)/\pi=2V_{dc}/\pi$.
The floating star point removes common-mode components, including triplen harmonics, but not the balanced fundamental. Therefore the phase-voltage fundamental peak remains **$2V_{dc}/\pi$, B**.
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