Title :
The high efficiency transformer-less PV inverter topologies derived from NPC topology
Author :
Ma, Lin ; Kerekes, Tamas ; Teodorescu, Remus ; Jin, Xinmin ; Floricau, Dan ; Liserre, Marco
Author_Institution :
Sch. of Electr. Eng., Beijing Jiao Tong Univ., Beijing, China
Abstract :
The grid-connected photovoltaic (PV) systems are an important part of renewable energy sources and their integration is getting more and more widespread. In order to improve the efficiency, practicality and reliability of the PV systems, many kinds of new inverter topologies have been proposed to avoid using a grid isolation transformer. The NPC topology and two other derived topologies are presented and analyzed in this paper. Validated by experiments, it has been proven that they are very suitable for using in transformer-less PV applications due to high efficiency, low leakage current and EMI. Simulations using Simulink and the PLECS toolbox have been done for evaluating efficiency of different NPC topologies and some experimental results are presented in this paper to validate the operation of the different topologies.
Keywords :
invertors; photovoltaic power systems; power generation reliability; power grids; power transformers; renewable energy sources; EMI; NPC topology; PLECS toolbox; Simulink; grid isolation transformer; grid-connected photovoltaic systems; high efficiency transformer-less PV inverter topologies; photovoltaic systems reliability; renewable energy sources; AC motors; Electromagnetic interference; Leakage current; Photovoltaic systems; Protection; Pulse width modulation inverters; Solar power generation; Switches; Topology; Uniform resource locators; Efficiency; Multilevel converters; Photovoltaic;
Conference_Titel :
Power Electronics and Applications, 2009. EPE '09. 13th European Conference on
Conference_Location :
Barcelona
Print_ISBN :
978-1-4244-4432-8
Electronic_ISBN :
978-90-75815-13-9