دانلود رایگان مقاله انگلیسی, سوئیچینگ بهینه فرکانس پایین مدولاسیون پهنای پالس اینورتر نه سطحه Cascade

Optimal Low Switching Frequency Pulsewidth Modulation of Nine-Level Cascade Inverter

سال انتشار : 2015

نوع مقاله : IEEE JOURNALS & MAGAZIENS

تعداد صفحات : 13

Abstract—Synchronous optimal pulsewidth modulation (SOP)

permits low switching frequency modulation of multilevel inverter

for medium-voltage high-power industrial AC drives without

compromising on total harmonic distortion (THD). An aim of

our experiment was to operate nine-level cascade inverter of an

induction motor drive at an average device switching frequency

limited to rated fundamental frequency by using SOP technique.

To reduce the number of separate DC sources, a three-level diode

clamped converter was used as a cell in a nine-level cascade

inverter. Using SOP technique, optimal nine-level waveforms

were obtained by off-line optimization assuming steady-state

operation of the induction machine. The switching angles for

each semiconductor switch are then obtained from optimal ninelevel

waveforms based on the criteria to minimize the switching

frequency as well as unbalance in DC-link capacitor voltages.

Experimental results obtained from the 1.5 kW induction motor

drive show THD < 5% for stator currents. The results indicate

that SOP technique reduces the switching frequency of operation

without compromising on THD.

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