Title :
An optimization design for 5-kW centralized PV inverter to achieve 99% efficiency
Author :
Cong Zheng ; Rui Chen ; Hongbo Ma ; Baifeng Chen ; Chien-Liang Chen ; Wensong Yu ; Jih-sheng Lai ; Faraci, Eric
Author_Institution :
Dept. of Electr. & Comput. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
In this paper, a 5-kW photovoltaic (PV) inverter with more than 99% peak efficiency is presented. The inverter utilizes two coupled inductors in one resonant pole to ensure the zero-voltage switching (ZVS) for main switches, and zero-current switching (ZCS) for auxiliary switches. Due to the favorable cooling and ease of fabrication characteristics, PCB planar magnetics are employed as the coupled resonant inductors. In addition, super-junction MosFETs with low on-state resistance is selected in order to reduce the inverter conduction loss. The optimization design of planar resonant inductors is described and verified by finite element analysis (FEA) software. During the experiment on the 5-kW inverter prototype, the temperature rise of planar inductors is below 15°C without fan cooling at full load.
Keywords :
finite element analysis; inductors; invertors; photovoltaic power systems; power MOSFET; printed circuits; switching convertors; zero voltage switching; PCB planar magnetics; ZCS; ZVS; auxiliary switches; centralized photovoltaic inverter; coupled resonant inductors; fan cooling; finite element analysis; inverter conduction loss; optimization design; planar resonant inductors; power 5 kW; resonant pole; superjunction MOSFET; zero current switching; zero voltage switching; Soft-switching inverter; ac resistance; efficiency improvement; planar resonant inductor;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2013 Twenty-Eighth Annual IEEE
Conference_Location :
Long Beach, CA
Print_ISBN :
978-1-4673-4354-1
Electronic_ISBN :
1048-2334
DOI :
10.1109/APEC.2013.6520720
