In this paper, several recently proposed transformerless PV
inverters with different galvanic isolation methods and CMV
clamping techniques, as shown in Fig. 1, are analyzed and compared.
A simple modified HBZVR-D is also proposed, to combine
the benefits of the low-loss ac-decoupling method and the
complete leakage current elimination of the CMV clamping
method. Performance of HBZVR-D is compared to other existing
topologies in terms of CMV, leakage current, total harmonic
distortion (THD), losses analysis, and efficiency. Discussions
are done based on MATLAB/Simulink simulations and further
validated through experimental tests. It is proven that HBZVRD
topology gives the best overall performance and is suitable
for transformerless PV applications.
In this paper, several recently proposed transformerless PVinverters with different galvanic isolation methods and CMVclamping techniques, as shown in Fig. 1, are analyzed and compared.A simple modified HBZVR-D is also proposed, to combinethe benefits of the low-loss ac-decoupling method and thecomplete leakage current elimination of the CMV clampingmethod. Performance of HBZVR-D is compared to other existingtopologies in terms of CMV, leakage current, total harmonicdistortion (THD), losses analysis, and efficiency. Discussionsare done based on MATLAB/Simulink simulations and furthervalidated through experimental tests. It is proven that HBZVRDtopology gives the best overall performance and is suitablefor transformerless PV applications.
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