IMPROVED VOLTAGE OF CASCADED INVERTERS USING SINE QUANTIZATION PROGRESSION
Abstract: The previous methods
of cascaded multilevel inverter (CMLI) can improve power quality but the
methods have low voltage output if the DC voltages limited by the voltage
rating of power semiconductor. To improve the amplitude of CMLI output voltage,
this paper proposes a new DC voltage progression. The progression based on sine
quantization method (SQM), which determines a sequence of DC voltages from
discrete amplitudes of sine wave function. The method also collaborates with
step equal residual area method (SERAM) to minimized total harmonics
distortions (THD). A single-phase CMLI that consist four H-Bridges simulated
and implemented to verify the methods. Amplitude output voltage and THD results
of simulations and experiments indicate that the sine quantization progression
produce the highest output voltage than other DC voltage progressions, with
power quality or THD in the accepted region. The amplitude of output voltage
have linier function with amplitude equal 0.6665 times of H-Bridges numbers and
have exponential function of THD with value below 5%.
Penulis: Bambang Sujanarko,
Mochamad Ashari, Mauridhi Hery Purnomo
Kode Jurnal: jptkomputerdd100035
