581306.fig.006
Figure 6: Pole voltages 𝑉 𝑎 1 , 𝑉 𝑎 2 and 𝑉 𝑥 1 , 𝑉 𝑥 2 , line-to-line voltages 𝑉 𝑎 1 𝑏 1 and 𝑉 𝑥 1 𝑦 1 , and phase voltages 𝑉 𝑎 𝑠 and 𝑉 𝑥 𝑠 of dual three-phase system with discontinuous synchronized PWM ( 𝐹 = 3 5  Hz, 𝑉 𝑑 𝑐 1 = 𝑉 𝑑 𝑐 2 = 𝑉 𝑑 𝑐 3 = 𝑉 𝑑 𝑐 4 , 𝑚 1 = 𝑚 2 = 𝑚 3 = 𝑚 4 = 0 . 7 , 𝐹 𝑠 = 1  kHz).