A Different Single-Phase Hybrid Five-Level Voltage-Source Inverter Using DC-Voltage Modules

Abstract

IntroductionThe need of high power converter, and the growth of modern power semiconductor switches such as power MOSFET and IGBTs boost the research interest in power converters such as multilevel voltage source inverters (MVSI) and its dual circuit, multilevel current source inverters (MCSI). They are capable to generate a high output power with lower gradient voltage or current, and higher quality of output waveforms resulting in less EMI noise and smaller size of output filter required by the converter A circuit configuration of MVSI achieved using series-connected sub-multilevel converter blocks and H-bridge inverter was presented in [6]. Reference [7] described a MVSI applying H-bridge VSI and additional bidirectional power switches. Nevertheless, the bidirectional power switches used in the inverter circuit configurations presented in [6] and [7] can be the lack of the circuits. In practical, the bidirectional power switches built by using configuration of two controlled power switches or combination of a single switch and four power diodes will increase the losses of the inverter. Another configuration of MVSI attained from the connection of several two-level power cells was presented in [8]. The requirement of many controlled power switches, and splitted DC voltage sources will add the cost and circuit complexity of the inverter. Reference [9] conveyed a symmetrical hybrid MVSI composed using three-level cells and H-bridge inverter. Total, eight power switches are required to create a fivelevel inverter circuit.

New Dead-Time Compensation Method of Power Inverter using Carrier Based Sinusoidal Pulse-Width Modulation

“…These carrier signals have the same frequency, the same phase and the same peak-to-peak amplitude. The carrier signals frequency sets the switching frequency of power switches used in the inverter [29], [30]. The waveform V m is the sinusoidal modulating signal.…”

Five-level PWM Inverter with a Single DC Power Source for DC-AC Power Conversion

“…Figure 1 shows the circuit configuration of the DC power module used in the inverter circuits, and its typical output waveform [5], [11]. Figure 2 shows the circuit configuration of the five-level inverter obtained using the proposed method.…”

“…The modulating signals utilize two sinusoidal waveforms with opposite phase. The frequency of the modulating signals (the reference sinusoidal waveforms) determines the fundamental frequency of the output voltage waveform, whereas the frequency of carrier waveforms sets the switching frequency of inverter's controlled switches [1], [5], [11], [12]. The PWM modulation technique used in the proposed inverter is shown in Figure 6.…”

“…three-level inverter circuits has been widely used in industrial and traction drive. The requirement of many capacitors in the flying capacitor multilevel inverter leads complexity in the controller for balancing the capacitor's voltages of the inverter [5]. Some hybrid topologies of multilevel inverter have been proposed in order to eliminate some drawbacks of the three main inverter topologies previously discussed.…”

A Overlapping Carrier Based SPWM for a 5-Level Cascaded H-bridge Multilevel Inverter

“…This paper applied carrier based PWM techniques to the CHB-MLI by using multiple carrier waveforms and a sinusoidal reference wave form [10][11][12]. The number of carrier waveforms required to produce Y level output is (x-1), where x is the number of carrier waveforms [8].…”