For variable speed applications, a three-level voltage source inverter is increasingly providing changeable frequency and variable voltage. A suitable pulse width modulation approach is used to obtain the proper output voltage at the line side of the inverter. The three-level Diode Clamped or Neutral Point Clamped topology, which is a popular multi-level topology, is the subject of this chapter. Two Sine-triangle approaches and two Space Vector Pulse Width Modulation methods are used to create the modulation wave. These modulation waves are compared to a triangle carrier to generate PWM signals for the three phases. SVPWM approaches use a spinning reference voltage vector as a voltage reference instead of the three phase modulating waves used in SPWM. The amplitude and frequency of the reference vector regulate the magnitude and frequency of the line side's fundamental variable, correspondingly. Space Vector Modulation has become a popular PWM approach for three-phase Voltage Source Inverters due to its greater dc bus usage and lower harmonic distortion than SPWM. The four PWM approaches are simulated and compared for THD and Capacitor Balance in MATLAB/SIMULINK software. The applications are created using the Embedded Editor and Matlab Editor functions. Simulation results show that Space vector PWM better utilises dc bus voltage, produces less THD, and improves capacitor balance when compared to Sine PWM.
Author (S) Details
Urmila Bandaru
Department of Electrical and Electronics, G. Pulla Reddy Engineering College, Kurnool, A.P., India.
Y. Sai Indira Priyadarshini
G. Pullaiah College of Engineering, Kurnool, A.P., India.
M. Siva Sathyanarayana
Department of Electrical and Electronics, G. Pulla Reddy Engineering College, Kurnool, A.P., India.
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