An Optimized H5 Hysteresis Current Control with Clamped Diodes in Transformer-Less Grid-PV Inverter
With the rise of renewable energy penetration in the grid, photovoltaic (PV) panels are connected to the grid via inverters to supply solar energy. Transformer-less grid-tied PV inverters are gaining popularity because of their improved efficiency, reduced size, and lower costs. However, they can in...
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MDPI AG
2025-01-01
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| author | Sushil Phuyal Shashwot Shrestha Swodesh Sharma Rachana Subedi Anil Kumar Panjiyar Mukesh Gautam |
| author_facet | Sushil Phuyal Shashwot Shrestha Swodesh Sharma Rachana Subedi Anil Kumar Panjiyar Mukesh Gautam |
| author_sort | Sushil Phuyal |
| collection | DOAJ |
| description | With the rise of renewable energy penetration in the grid, photovoltaic (PV) panels are connected to the grid via inverters to supply solar energy. Transformer-less grid-tied PV inverters are gaining popularity because of their improved efficiency, reduced size, and lower costs. However, they can induce a path for leakage currents between the PV and the grid due to the absence of galvanic isolation. This leads to serious electromagnetic interference, loss in efficiency, and safety concerns. The leakage current is primarily influenced by the nature of the common mode voltage (CMV), which is determined by the switching techniques of the inverter. In this paper, a novel inverter topology of Hysteresis Controlled H5 with Two Clamping Diodes (HCH5-D2) is derived. The HCH5-D2 topology helps decouple the AC part (Grid) and DC part (PV) during the freewheeling period to make the CMV constant, thereby reducing the leakage current. Additionally, the extra diodes help reduce voltage spikes generated during the freewheeling period and maintain the CMV at a constant value. Finally, a 2.2 kW grid-connected single-phase HCH5-D2 PV inverter system’s MATLAB simulation is presented, showing better results compared to a traditional H4 inverter. |
| format | Article |
| id | doaj-art-e8a0d50f096e4136bff662a078e509f6 |
| institution | DOAJ |
| issn | 2673-4826 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| series | Electricity |
| spelling | doaj-art-e8a0d50f096e4136bff662a078e509f62025-08-20T02:42:46ZengMDPI AGElectricity2673-48262025-01-0161110.3390/electricity6010001An Optimized H5 Hysteresis Current Control with Clamped Diodes in Transformer-Less Grid-PV InverterSushil Phuyal0Shashwot Shrestha1Swodesh Sharma2Rachana Subedi3Anil Kumar Panjiyar4Mukesh Gautam5Department of Electrical Engineering, Tribhuvan University, Pulchowk Campus, Lalitpur 44600, NepalDepartment of Electrical Engineering, Tribhuvan University, Pulchowk Campus, Lalitpur 44600, NepalDepartment of Electrical Engineering, Tribhuvan University, Pulchowk Campus, Lalitpur 44600, NepalDepartment of Electrical Engineering, Tribhuvan University, Pulchowk Campus, Lalitpur 44600, NepalDepartment of Electrical Engineering, Tribhuvan University, Pulchowk Campus, Lalitpur 44600, NepalElectricity Infrastructure & Buildings Division, Pacific Northwest National Laboratory, Richland, WA 99354, USAWith the rise of renewable energy penetration in the grid, photovoltaic (PV) panels are connected to the grid via inverters to supply solar energy. Transformer-less grid-tied PV inverters are gaining popularity because of their improved efficiency, reduced size, and lower costs. However, they can induce a path for leakage currents between the PV and the grid due to the absence of galvanic isolation. This leads to serious electromagnetic interference, loss in efficiency, and safety concerns. The leakage current is primarily influenced by the nature of the common mode voltage (CMV), which is determined by the switching techniques of the inverter. In this paper, a novel inverter topology of Hysteresis Controlled H5 with Two Clamping Diodes (HCH5-D2) is derived. The HCH5-D2 topology helps decouple the AC part (Grid) and DC part (PV) during the freewheeling period to make the CMV constant, thereby reducing the leakage current. Additionally, the extra diodes help reduce voltage spikes generated during the freewheeling period and maintain the CMV at a constant value. Finally, a 2.2 kW grid-connected single-phase HCH5-D2 PV inverter system’s MATLAB simulation is presented, showing better results compared to a traditional H4 inverter.https://www.mdpi.com/2673-4826/6/1/1common mode voltageelectromagnetic interferenceHCH5-D2 topologyleakage currentphotovoltaics |
| spellingShingle | Sushil Phuyal Shashwot Shrestha Swodesh Sharma Rachana Subedi Anil Kumar Panjiyar Mukesh Gautam An Optimized H5 Hysteresis Current Control with Clamped Diodes in Transformer-Less Grid-PV Inverter Electricity common mode voltage electromagnetic interference HCH5-D2 topology leakage current photovoltaics |
| title | An Optimized H5 Hysteresis Current Control with Clamped Diodes in Transformer-Less Grid-PV Inverter |
| title_full | An Optimized H5 Hysteresis Current Control with Clamped Diodes in Transformer-Less Grid-PV Inverter |
| title_fullStr | An Optimized H5 Hysteresis Current Control with Clamped Diodes in Transformer-Less Grid-PV Inverter |
| title_full_unstemmed | An Optimized H5 Hysteresis Current Control with Clamped Diodes in Transformer-Less Grid-PV Inverter |
| title_short | An Optimized H5 Hysteresis Current Control with Clamped Diodes in Transformer-Less Grid-PV Inverter |
| title_sort | optimized h5 hysteresis current control with clamped diodes in transformer less grid pv inverter |
| topic | common mode voltage electromagnetic interference HCH5-D2 topology leakage current photovoltaics |
| url | https://www.mdpi.com/2673-4826/6/1/1 |
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