B. Selective harmonic elimination P

B. Selective harmonic elimination PWM
In order to achieve a wide range of modulation indexes with minimized THD for the
synthesized wave forms,a generalized selective harmonic modulation method [66-67] was
proposed, which is called virtual stage PWM [68]. An output wave form is shown in Figure
31.26. The Virtual Stage PWM is a combination of Unipolar Programmed PWM and the
fundamental frequency switching scheme. The output waveform of Unipolar Programmed PWM
is shown inFigure 31.27. When Unipolar Programmed PWM is employed on a multilevel
converter, typically one DC voltage is involved, where the switches connected to the DC voltage
are switched“on” and “off” several times per fundamental cycle. The switching pattern decides
what the output voltage wave form looks like.

Hasil (Bahasa Indonesia) 2:

B. Selektif harmonik penghapusan PWM
Untuk mencapai berbagai indeks modulasi dengan THD diminimalkan untuk
bentuk gelombang disintesis, metode umum selektif harmonik modulasi [66-67] telah
diusulkan, yang disebut PWM panggung virtual [68]. Bentuk gelombang output ditunjukkan pada Gambar
31,26. Virtual Tahap PWM adalah kombinasi dari unipolar Programmed PWM dan
skema beralih frekuensi dasar. Output gelombang dari unipolar Programmed PWM
ditampilkan inFigure 31,27. Ketika unipolar Programmed PWM digunakan pada multilevel
converter, biasanya satu tegangan DC yang terlibat, di mana switch terhubung ke tegangan DC
diaktifkan "on" dan "off" beberapa kali per siklus fundamental. Pola beralih memutuskan
apa bentuk gelombang tegangan output terlihat seperti.