Single-phase transformerless PV inverter topology with AC bypass and mid-DC-link voltage clamping

Summarization: Transformerless PV inverters are known to generate undesirable ground leakage currents due to the lack of galvanic isolation between the PV array and the electric grid. This paper initially discusses the different types of transformerless PV inverter topologies that have been proposed to overcome this problem. It then proposes a new topology, which extends the commercially successful HERIC inverter with the addition of a mid-DC-link clamping configuration. Such configurations are known to cause a highly desirable reduction of the ground leakage currents, which is demonstrated through simulation results from MATLAB-Simulink and PLECS. The proposed topology is finally compared to other transformerless topologies with respect to other aspects, such as efficiency and component count.Παρουσιάστηκε στο: 19th European Conference on Power Electronics and Application