Analysis of a hybrid PWM based on modified space-vector and triangle-comparison methods

A generalized scalar pulse-width modulation for nine-switch inverters: An approach for non-sinusoidal modulating waveforms

“…In particular, modified modulation techniques, that use non-sinusoidal modulating signals generated by adding zero axis components (homopolar components) to the three sinusoidal reference waveforms, could be applied in order to enhance a particular characteristic of the inverter, such as wider linear modulation range, efficiency or THD. Previous works [2] have shown that SVM produces switching sequences identical to those obtained with the modified scalar modulation when the appropriate zero axis components is used. Since the scalar approach uses simple equations only with scalar variables to determine the switches duty cycles, its implementation is more straightforward than the SVM, that uses lookup tables and trigonometric equations, specially if the modulation is applied to nonconventional converter topologies.…”

“…The modulation techniques for three-phase inverters can be classified in three types: indirect, such as space-vector modulation (SVM) [2] and scalar modulation; direct, such as selective harmonic elimination PWM [3]; and based on switching tables, where the switches' states are defined directly from control strategies, such as sliding mode control [4] and direct torque control [5].…”

Novel Pulse-width Modulation Strategy to Minimize the Switching Losses of Z-Source Inverters

“…The implementation of SVPWM is easily realized in a digital controller by simply adding the offset to the three-phase voltage references [4][5][6]. In previous research, SVPWM is modified and implemented to the ZSI [7,8].…”

“…It achieves the maximum voltage gain without the low-frequency ripples on the Z-network. For the conventional VSI, space vector PWM (SVPWM) has been widely used because it has decent performance in utilizing DC voltage, has low current harmonics, and can easily be realized in digital implementation using digital scalar PWM (DSPWM) or hybrid PWM [4][5][6]. The SVPWM can be easily modified and implemented to the ZSI, which is known as modified SVPWM (MSVPWM) [7].…”

Sliding Mode Pulse Width Modulation

“…Various pulse width modulation (PWM) control technologies are being used in inverter control. For example sine-triangle PWM [1], harmonic elimination PWM [2], [3], hysteresis band control, space vector PWM [4], hybrid PWM [5], etc. Some of these approaches are open-loop control using precalculated switching pattern, such as harmonic elimination PWM.…”