A new high-efficiency single-phase transformerless PV inverter topology
#1

A new high-efficiency single-phase transformerless PV inverter topology

Tamás Kerekes, Member, IEEE, Remus Teodorescu, Senior Member, IEEE, Pedro Rodríguez, Member, IEEE,
Gerardo Vázquez, Student Member, IEEE, Emiliano Aldabas, Member, IEEE



ABSTRACT:

There is a strong trend in the photovoltaic (PV) inverter technology to use transformer less topologies in order to acquire higher efficiencies combining with very low ground leakage current. In this paper a new topology, based on the H Bridge with a new AC bypass circuit consisting in a diode rectifier and a switch with clamping to the DC midpoint is proposed. The topology is simulated and experimentally validated and a comparison with other existing topologies is performed. High conversion efficiency and low leakage current is demonstrated.

I INTRODUCTION
Photovoltaic inverters become more and more widespread within both private and commercial circles. These grid connected inverters convert the available direct current supplied by the photovoltaic (PV) panels and feed it into the utility grid. According to the latest report on installed PV power, during 2007 there has been a total of 2.25GW of installed PV systems, out of which the majority (90%) has been installed in Germany, Spain, USA and Japan. At the end of 2007 the total installed PV capacity has reached 7.9 GW of which around 92% is grid connected [1]. There are two main topology groups used in case of grid connected PV systems and they are: with and without galvanic isolation [2]. Galvanic isolation can be on the DC side, in the form of a high frequency DC-DC transformer or on the grid side in the form of a big-bulky AC transformer. Both of these solutions offer the safety and advantage of galvanic isolation, but the efficiency of the whole system is decreased, due to power losses in these extra components. In case the transformer is omitted the efficiency of the whole PV system can be increased with an extra 1-2%. The most important advantages of transformer less PV systems can be observed in Fig. 1, like: higher efficiency, smaller size and weight compared to the PV systems that have galvanic isolation (either on the DC or AC side). 1 Fig. 1 has been made from the database of more than 400 commercially available PV inverters, presented in a commercial magazine about PV systems [3]. Transformer less inverters are represented by the dots (Transformer less), while the triangles represent the inverters that have a low-frequency transformer on the grid side (LF-transformer) and last the stars represent the topologies including a high-frequency DC-DC transformer (HF-transformer), adding a galvanic isolation between the PV and grid. The conclusion drawn from these graphs is that transformer less inverters have higher efficiency,

http://sunlux.cz/attachments/068_High-ef...nology.pdf
Reply

Important Note..!

If you are not satisfied with above reply ,..Please

ASK HERE

So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page
Popular Searches: single level inverter ppt, transformerless inverter for single phase photovoltaic systems, son high frequency dc ac inverter, transformerless inverter thesis, thesis on transformerless pv inverter, a new high efficiency single phase transformerless pv inverter topology, documentation on a high efficient transformer less pv inverter tropology,

[-]
Quick Reply
Message
Type your reply to this message here.

Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  Electric field Optimization of High Voltage Electrode Based On Neural Networks computer science crazy 2 10,025 01-01-2018, 11:56 AM
Last Post: dhanabhagya
  Advancements In Inverter Technology For Industrial Applications project report tiger 18 24,192 17-04-2017, 12:30 PM
Last Post: jaseela123d
  Space Vector Pulse Width Modulation (SVPWM) Scheme for Inverter Using MATLAB/SIMULINK project report helper 11 10,289 25-05-2016, 01:38 AM
Last Post: Guest
  A Neural-Network-Based Space-Vector PWM Controller for Voltage-Fed Inverter Inducti project report helper 1 8,847 07-09-2015, 06:23 PM
Last Post: hafsa_012
Shocked New seminars topic List seminar projects crazy 34 32,557 21-01-2015, 10:10 PM
Last Post: seminar report asees
  High Performance Motor Drive Using Matrix Converter project topics 3 9,388 27-07-2013, 10:35 AM
Last Post: computer topic
  Fault Locating In Undegrounded And High Resistance GroundedSystems computer science crazy 12 14,490 15-04-2013, 02:15 PM
Last Post: Guest
  Space Vector Modulated Three-phase to Three-phase Matrix Converter with Input Power computer science technology 2 3,590 27-01-2013, 11:46 AM
Last Post: [email protected]
  Multilevel inverter for power system applications highlighting asymmetric design effe seminar topics 2 4,276 29-12-2012, 11:22 AM
Last Post: seminar details
  A NEW INTERCONNECTING METHOD FOR WIND TURBINE/GENERATOR IN A WIND FARM science projects buddy 2 3,484 28-12-2012, 12:23 PM
Last Post: seminar details

Forum Jump: