Analyzing the current ripple for the inductor of three-phase voltage source converters (VSCs) has always been challenging, especially for multilevel converters due to the complexity of the current ripple waveform. To calculate the high frequency core and the copper losses, the current ripple must be analyzed for each switching cycle. More importantly, the same analysis can be extended to accurately calculate the higher order filter for grid-connected VSC. This paper analyzes the inductor current ripple for three-phase three-level active neutral point clamped (ANPC) VSC. The current ripple for each switching cycle is generalized and the maximum current ripple is derived. The rest of the filter parameters by using the method are calculated. The derived equation is used to design a filter for a 10 kW gallium-nitride (GaN) based three-level ANPC-VSC. The challenge of using high switching frequency switches for designing the filter is also discussed in this paper. In fact, when the switching frequency falls in the area that electromagnetic interference (EMI) standards are applied, then the size of the filter and the number of the filtering stage is also highly affected.
|Titel||Proceedings of the 12th International Conference on Power Electronics and Drive Systems|
|Status||Udgivet - 2017|
|Begivenhed||12th IEEE International Conference on Power Electronics and Drive Systems - Honolulu, USA|
Varighed: 12. dec. 2017 → 15. dec. 2017
Konferencens nummer: 12
|Konference||12th IEEE International Conference on Power Electronics and Drive Systems|
|Periode||12/12/2017 → 15/12/2017|