Abstract
Integrated power electronics for photovoltaic applications has attracted increasing interest, due to the possibility of having grid-connected photovoltaic modules with independent maximum power point tracking and high reliability. In this paper, a single-phase Current Source Inverter (CSI) is discussed for a photovoltaic application. The basic CSI topology will be explained for the sake of completeness, highlighting its main features and analyzing the ground leakage current problem, an important benchmark for photovoltaic application. A novel topology, called CSI5, is proposed in this work. The main feature is the presence of additional switches for ground leakage current reduction. The performance of the proposed topology is assessed by numerical simulation, and the experimental results confirm that this solution is able to strongly reduce the ground leakage current and conduction power losses.
Highlights
Photovoltaic (PV) energy production has witnessed a steady increase in the past 15 years
The contribution of this paper is a thorough analysis of the CSI5 topology with active decoupling devices, which clamp the output of the H-bridge stage during the zero states of the pulse width modulation, allowing for extremely low levels of ground leakage current
The theoretical tool used for the analysis of the ground leakage current in grid-connected Pulse Width Modulation (PWM) is usually the common mode voltage evaluation, as shown in the relevant literature for the VSI [15,16]
Summary
Photovoltaic (PV) energy production has witnessed a steady increase in the past 15 years. The scenario for power electronics is well-established [1,2], and several possibilities are present for different power levels, ranging from (Megawatt) MW -scale centralized inverters (for very large solar arrays), to the medium-power solution (single and three-phase) to the micro-inverter type, called a string inverter or module-integrated converter (MIC). The CSI5 topology was proposed for the first time in [12], where the present work further expands the theoretical and simulation analysis, offering a comprehensive coverage of the benefits and drawbacks of single-phase CSI for PV applications, and in particular of the proposed solution These improvements are analyzed in order to verify the effectiveness of this power converter employed as a PV MIC. The contribution of this paper is a thorough analysis of the CSI5 topology with active decoupling devices, which clamp the output of the H-bridge stage during the zero states of the pulse width modulation, allowing for extremely low levels of ground leakage current
Sign-in/Register to view highlights & summary 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.
