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Multilevel inverter technology has emerged recently as a very important alternative in the area of high power energy control. Number of topologies have been introduced and widely used in drive applications. Among these topologies, the cascaded H-Bridge inverter is used in this paper because of its advantages over other topologies. Different control techniques are available to control these inverter...
This research work is organized in two sections. Performance comparison of single phase half bridge inverter and single phase full bridge inverter is done in the first section. It is observed the output current and output voltage of full bridge inverter is twice and generates less total harmonic distortion as compared to half bridge inverter. In the second section, performance comparison of Unipolar...
This paper deals with the design and analysis of new h-bridge based single and three phase cascaded multilevel inverter. It has two types of sources: symmetric and asymmetric source. In this topology asymmetric source is preferred because it provides large number of output voltage level with minimum number of switches. This new H-bridge based cascaded multilevel inverter is able to increase output...
Take a cascaded multilevel inverter with four H-bridges in each phase leg for example, this paper studies the basic theories of two different carrier phase-shifted SPWM (CPS-SPWM) methods: unipolar dual-frequency CPS-SPWM and bipolar CPS-SPWM, and compares the advantages and disadvantages of these two algorithms. It also does some researches on the factors which may influence the output waveform quality...
The sinusoidal pulse width modulation (SPWM) has been widely used because of its simple implementation. The number of output voltage pulses and the frequency of the lowest harmonic voltage in unipolar SPWM are twice that of bipolar SPWM with the same switching frequency, so the unipolar SPWM facilitates the choice of filter and has better output waveforms. For the medium or low voltage high-current...
This paper presents a novel control scheme suitable for high-power high-performance AC power supplies. The performances of the conventional current-regulated voltage-controlled system with bipolar PWM are first analyzed in detail. The proposed control scheme incorporates dual synchronous PWM technique of single-phase full-bridge inverter and multiple feedback loop. Thanks to this scheme, the AC power...
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