Abstract
For the grid-connected photovoltaic inverters, the switching-frequency common-mode voltage brings the leakage current, which should be eliminated. So far, many kinds of single-phase inverters have been published for this purpose, but most of them are the conventional voltage-type ones, which have the disadvantages of poor reliability due to the DC-link electrolytic capacitor and the risk of short-through of the bridge switches. To solve this technical issue, a novel current source inverter with AC-side clamping is proposed to mitigate the switching-frequency common-mode voltage. Meanwhile, a novel modulation method is proposed for the new single-phase inverter to achieve low-frequency operation of the main switches, which reduces the switching losses. Finally, the proposed method is implemented on the TMS320F28335DSP + XC6SLX9FPGA digital hardware platform. Also, the performance comparisons are done with the traditional solution. The results prove the proposed solution.
Highlights
Photovoltaic (PV) power generation is one of the ways to effectively use energy
Energy can be obtained from photovoltaic panels by grid connection of photovoltaic inverters or by connecting transformers
When the transformerless PV inverter is connected to the grid, there are still many technical challenges to be solved, such as the leakage current or ground current
Summary
Photovoltaic (PV) power generation is one of the ways to effectively use energy. Through photovoltaic panels to obtain energy, photovoltaic systems can provide green sustainable solutions [1,2]. Energy can be obtained from photovoltaic panels by grid connection of photovoltaic inverters or by connecting transformers. The electrical connection exists between the photovoltaic panel and the grid, and a leakage current will be generated on the parasitic capacitance between the photovoltaic panel and the ground. Due to the switching-frequency common-mode voltage, the leakage current of the conventional current-source four-switch inverter is large. This characteristic limits the application of conventional current source inverters in transformerless photovoltaic systems. Inspired by the bypass-type voltage source inverter topology [23], this paper proposes a novel AC-side clamped current-source inverter topology, which effectively suppresses the switching-frequency common-mode voltage, so as to reduce the leakage current.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
