期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 30, 期 2, 页码 618-631出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2014.2312980
关键词
Aging; dc-dc converters; differential power processing (DPP); equalization; mismatch; partial shading; photovoltaic modules; submodule-integrated converters (subMICs)
资金
- Advanced Research Projects Agency-Energy, an agency of the United States Government, U.S. Department of Energy [DE-AR0000216]
- Generalitat de Catalunya, Beatriu de Pinos programme [BP-B00047]
Differential power processing (DPP) architectures employ distributed, low power processing, submodule-integrated converters to mitigate mismatches in photovoltaic (PV) power systems, while introducing no insertion losses. This paper evaluates the effects of the simple voltage-balancing DPP control approach on the submodule-level maximum power point (MPP) efficiency. It is shown that the submodule MPP efficiency of voltage-balancing DPP converters exceeds 98% in the presence of worst-case MPP voltage variations due to irradiance or temperature mismatches. Furthermore, the effects of reduced converter power rating in the isolated-portDPP architecture are investigated by long-term, high-granularity simulations of five representative PV system scenarios. For partially shaded systems, it is shown that the isolated-port DPP architecture offers about two times larger energy yield improvements compared to full power processing (FPP) module-level converters, and that it outperforms module-level FPP approaches even when the power rating of DPP converters is only 20-30% of the PV system peak power. In the cases of aging-related mismatches, more than 90% of the energy yield improvements are obtained with DPP converters rated at only 10% of the PV peak power.
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