Journal
ENERGIES
Volume 14, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/en14102811
Keywords
high power conversion; low switching frequency modulation; multilevel converters; harmonic overlap effect
Categories
Funding
- Shenzhen Science and Technology Program [JCYJ20200109141601708]
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This paper investigates the influences of low-frequency modulation on circuit operation and proposes corresponding solutions, classified as harmonic overlap effect. A comprehensive summary of the impacts and solutions on typical high power converters is drawn, with design rules proposed for multilevel voltage source converters at low switching frequency.
In most high power industrial applications, the low switching frequency modulations (LSFM) are usually implemented to reduce power loss and heat dissipation pressure. However, there are some unexpected influences caused by the low order harmonic sinusoidal pulse width modulation (SPWM), such as the imbalanced submodule power in cascaded half-bridge inverter (CHB) and limited output power capability in H-bridge neutral-point-clamped (HNPC) converter. This paper starts by generalizing the basic characteristic of two-level SPWM, then deeply investigates the influences of low-frequency modulation on the operation of the circuits. They are classified into three mechanisms and generally named as harmonic overlap effect (HOE). The corresponding solutions to copy with the mechanisms are proposed and verified in some topologies through high-power simulations in simulations. In addition, a comprehensive summary of the influences and solutions of these effects on typical high power converters is drawn. The design rules of the modulation schemes for multilevel voltage source converters (VSCs) at low switching frequency are also proposed.
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