Three Phase ZVR Topology and Modulation Strategy for Transformerless PV System


Leakage current decrease is pivotal for working transformer-less PV frameworks. In this letter, another three-stage topology and regulation procedure is proposed. It is gotten from the single-stage ZVR topology (zero-voltage state rectifier) , however the task system is very extraordinary. Along these lines, another regulation system dependent on the Boolean rationale work is proposed to accomplish the steady normal mode voltage, to wipe out the spillage current. At last, the test tests are done to check the attainability and viability of the proposed arrangement.



Fig. 1. Schematic diagram of three-phase ZVR topology.



  Fig. 2 Experimental results with the dual-carrier modulation. (a) Grid current; (b) Stray capacitor voltage and leakage current

Fig. 3. Experimental results with proposed modulation. (a) Grid current; (b) Stray capacitor voltage and leakage current

Fig. 4 Dynamic experiments with proposed modulation. (a) Phase_A grid voltage and current, (b) dc-link capacitor voltages, stray capacitor voltage and leakage current

Fig. 5. The current and voltage through the ZVR.



This letter has displayed the examination and test confirmation of another three-stage ZVR topology and its tweak methodology to wipe out the spillage current for transformerless PV frameworks. The discoveries uncover that the spillage current can be successfully decreased well beneath 300mA by choosing the exchanging conditions of new three-stage ZVR topology. Beside that, the proposed tweak is easy to execute. Accordingly, it is appealing for three-stage transformerless PV frameworks. The future research is toward the extensive hypothetical examination the capacitor voltage adjusting instrument of the proposed arrangement.

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