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Current Source AC-Side Clamped Inverter for Leakage Current Reduction in Grid-Connected PV System

Department of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China
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Author to whom correspondence should be addressed.
Electronics 2019, 8(11), 1296; https://doi.org/10.3390/electronics8111296
Received: 16 October 2019 / Revised: 24 October 2019 / Accepted: 29 October 2019 / Published: 6 November 2019
(This article belongs to the Special Issue Power Converters in Power Electronics)
For the grid-connected photovoltaic inverters, the switching-frequency common-mode voltage brings the leakage current, which should be eliminated. So far, many kinds of single-phase inverters have been published for this purpose, but most of them are the conventional voltage-type ones, which have the disadvantages of poor reliability due to the DC-link electrolytic capacitor and the risk of short-through of the bridge switches. To solve this technical issue, a novel current source inverter with AC-side clamping is proposed to mitigate the switching-frequency common-mode voltage. Meanwhile, a novel modulation method is proposed for the new single-phase inverter to achieve low-frequency operation of the main switches, which reduces the switching losses. Finally, the proposed method is implemented on the TMS320F28335DSP + XC6SLX9FPGA digital hardware platform. Also, the performance comparisons are done with the traditional solution. The results prove the proposed solution.
Keywords: current source inverter; common-mode voltage; leakage current current source inverter; common-mode voltage; leakage current
MDPI and ACS Style

Li, X.; Wang, N.; San, G.; Guo, X. Current Source AC-Side Clamped Inverter for Leakage Current Reduction in Grid-Connected PV System. Electronics 2019, 8, 1296.

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