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April 27, 2012IEEE Transactions on Power ElectronicsOpen Access

Common-Mode Voltage Reduction Pulsewidth Modulation Techniques for Three-Phase Grid-Connected Converters

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Authors

CHChung‐Chuan HouChung Hua UniversityCSChih-Chung ShihDelta Electronics (Taiwan)PCPo-Tai ChengNational Tsing Hua University

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Implication

Experimental study demonstrates reduced ground leakage current in grid-connected converters, suggesting superior performance for transformerless solar power.

Key Points

  • To evaluate and compare various pulsewidth modulation techniques for mitigating common-mode voltage and ground leakage currents in transformerless grid-connected photovoltaic converter systems.
  • Tested conventional pulsewidth modulation methods (SVPWM and DPWM) alongside reduced common-mode voltage methods (AZSPWM and NSPWM) on a 1-kW rated PWM rectifier.
  • Emulated a photovoltaic system using an additional common-mode capacitor to incorporate parasitic capacitance effects and determine common-mode circuit resonant frequencies.
  • Reduced common-mode voltage PWM techniques significantly lowered common-mode voltage and common-mode leakage current compared to conventional SVPWM and DPWM methods.
  • Near-state PWM (NSPWM) delivered the optimal overall performance, exhibiting the lowest ground leakage current, reduced phase and DC-link current ripples, and minimized switching losses.

Cite This Study

Hou et al. (2012) studied this question.

synapsesocial.com/papers/6a89bfe5176d2ac34cfbb513https://doi.org/10.1109/tpel.2012.2196712
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