Research on an Improved Single-Phase Unisolated Grid-Connected Photovoltaic Inverter
- 23 April 2021
- journal article
- Published by International Information and Engineering Technology Association in European Journal of Electrical Engineering
- Vol. 23 (2), 123-130
- https://doi.org/10.18280/ejee.230205
Abstract
An improved single-phase unisolated grid-connected photovoltaic inverter topology is proposed to solve the common mode leakage current problem of unisolated grid-connected photovoltaic inverters. By analyzing the topology structure and voltage clamping principle of the improved inverter, the topology can maintain the same low input voltage as the full-bridge inverter, and ensure that the common-mode voltage in the continuation mode is clamped to the midpoint voltage of the bus, so as to effectively reduce the common-mode leakage current caused by the common-mode voltage suspension in the continuation mode. Moreover, the common-mode leakage current of the improved topology is smaller than that of the traditional H6-2D topology at similar conversion efficiency. The simulation results on MATLAB /Simulink platform show that the topology is feasible and effective.Keywords
Funding Information
- National Natural Science Foundation of China (61741508)