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The paper presents a new four-level voltage source converter (VSC). Compared to conventional four-level converters, this proposed converter has fewer components and can be used for a higher power density system in low and medium voltage applications. Its principles and advantages are studied in this paper. The effect of various redundant switching states on the voltages of flying capacitors is analyzed...
A zero-sequence circulating current (ZSCC) is typically generated among the multiparallel converters that share the common dc link and ac side without isolated transformers under the space vector modulation (SVM), due to the injected third-order zero-sequence voltage (ZSV). This paper analyzes SVM techniques, studies the effects of the ZSV on the ZSCC control loop in detail, and then proposes an improved...
This paper proposes a digital implement method of selective harmonic elimination pulse width modulation (SHEPWM) based on digital signal processor (DSP). First, the switching angles for eliminating selective harmonics are calculated with computer-aided software, and functional relationships between modulation indexes and switching angles are obtained. The curve fitting technique is then used to fit...
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