Abstract
Three-level converters have drawn extensive attention due to their ability to deliver high-quality power. High semiconductor count is the main drawback of three-level converters. As a solution to this, a 10-switch converter is presented, that has advantages over both two- and three-level converters, simultaneously, plus it is applicable to a variety of power ranges. However, the switching pattern of 10-switch converter is not as simple as standard three-level converter due to lack of medium vectors. This paper presents a novel space vector modulation (SVM) for a 10-switch converter to reduce total harmonic distortion (THD) and common mode voltage (CMV) of this converter in comparison to prior carrier-based modulation methods. A simplified, low-cost modulation algorithm for the converter is proposed. The designed switching sequence has aimed at a low output THD and enhancement of DC bus voltage utilization. The performance of the proposed SVM is then compared to upgraded sinusoidal PWM. AC power quality and CMV of a 10-switch converter based on two modulation methods are investigated via simulation models. It was validated via simulation and experimental models that the proposed SVM utilized DC bus voltage more efficiently, generated remarkably less THD compared to other methods, and had a lower peak and rms CMV.
Highlights
The interest in using multilevel converters in energy conversion for renewable energy resources application in microgrids, electric drives, plug-in electric vehicles, etc. is rapidly growing [1,2,3,4,5]
The neutral point clamped (NPC) converter is a standard candidate of three-level multilevel converters that has high quality AC outputs and low semiconductor number comparing to other multilevel topologies
10-switch converter was introduced to reduce the high computations at each step of the modulation method and omits the need to divide each sector to three intervals and determining the minimum, maximum, and medium signal at every interval
Summary
The interest in using multilevel converters in energy conversion for renewable energy resources application in microgrids, electric drives, plug-in electric vehicles, etc. is rapidly growing [1,2,3,4,5]. A three-level T-type converter is introduced as a solution for high semiconductor count challenge of multilevel converters that omits six fast diodes in comparison to NPC converter topology. The main drawback of this converter type is the voltage stress on IGBTs that is equal to the total DC-link voltage This means that two-times higher rate semiconductor has to be selected for a three-level T-type converter in comparison to a neutral point clamped (NPC) converter. A new class of converter in the matter of reducing the semiconductor count and elevating AC and DC voltage quality is introduced in [10], which is a hybrid 2/3 level converter called a 10-switch converter It resolves high semiconductor count in comparison to three-level converters such as NPC and T-type. SVM and SPWM power quality of converter outputs evaluated and compared each other; effectiveness of methods are presented, and powerare quality of converter outputstoare evaluated andthe compared to each presented is validated through experimental results. through experimental results
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