Method to Suppressing the Leakage Current Phenomenon of Non-Isolated Three-Level Photovoltaic Grid-Connected Inverters

DOI

10.2991/978-94-6463-821-9_6How to use a DOI?

Keywords

Three-Level Four-Bridge Inverter; Active Zero Sequence Current Injection

Abstract

With the increasing dominance of photovoltaic power generation in renewable energy, non-isolated three-level photovoltaic grid-connected inverters are widely used. However, due to their topology and the existence of parasitic capacitors, inverters can cause leakage current problems, which can cause grid current distortion and bring security risks. Two leakage current suppression strategies are summarized in this paper: improved inverter model prediction direct power control strategy and active zero sequence current injection-based control method. The improved inverter model predicts that the direct power control strategy has higher control precision and response speed and can effectively suppress the leakage current while ensuring the output power of the inverter. However, the output voltage is unstable in the two optimized structures. The principle of the control method based on active zero sequence current injection is simple and easy; the hardware of the inverter is less changed and can effectively reduce the leakage current and improve the safety of the photovoltaic power generation system, but it needs to add additional control lines of the injection current, and its cost will increase.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Zhiyi Qian
PY  - 2025
DA  - 2025/08/31
TI  - Method to Suppressing the Leakage Current Phenomenon of Non-Isolated Three-Level Photovoltaic Grid-Connected Inverters
BT  - Proceedings of the 2025 2nd International Conference on Mechanics, Electronics Engineering and Automation (ICMEEA 2025)
PB  - Atlantis Press
SP  - 39
EP  - 49
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-821-9_6
DO  - 10.2991/978-94-6463-821-9_6
ID  - Qian2025
ER  -