Title :
A comparison of soft and hard-switching losses in three phase micro-inverters
Author :
Zhang, Dehua ; Zhang, Qian ; Grishina, Anna ; Amirahmadi, Ahmadreza ; Hu, Haibing ; Shen, John ; Batarseh, Issa
Author_Institution :
Sch. of Electr. Eng. & Comput. Sci., Univ. of Central Florida, Orlando, FL, USA
Abstract :
The efficiency of a PV grid-tie micro-inverter is of critical concern to its application. Three representative three-phase voltage source micro-inverter topologies have been selected to make loss comparisons: A Hard Switching Inverter (HSI), an Auxiliary Resonant Commutated Pole Inverter (ARCPI), and an Actively Clamped Resonant DC-link Inverter (ACRDCLI). Loss composition and estimation are given in detail for 350W micro-inverters. It is pointed out that the HSI has outstanding advantages in both efficiency and cost. The ARCPI losses are lower than the other two topologies. But the auxiliary circuits are costly and the controlling and driving circuits are complicated. The ACRDCLI has a simple structure but high DC-link losses. If an improved control scheme is used, the DC-link losses of the ACRDCLI can be reduced. This paper compares these advantages and limitations for assessing the selection of soft-switching topologies for micro-inverters.
Keywords :
distributed power generation; invertors; photovoltaic power systems; power grids; ACRDCLI; ARCPI loss; DC-link loss; HSI; PV grid-tie microinverter; actively clamped resonant DC-link inverter; auxiliary resonant commutated pole inverter; hard switching inverter; hard-switching loss; power 350 W; soft-switching loss; soft-switching topology; three phase microinverters; three- phase voltage source microinverter topology; Clamps; Inductors; Inverters; Switches; Switching circuits; Switching loss; Topology;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2011 IEEE
Conference_Location :
Phoenix, AZ
Print_ISBN :
978-1-4577-0542-7
DOI :
10.1109/ECCE.2011.6063893
